CN218866165U

CN218866165U - Optical module

Info

Publication number: CN218866165U
Application number: CN202222092116.5U
Authority: CN
Inventors: 曾威; 蔚永军
Original assignee: Hisense Broadband Multimedia Technology Co Ltd
Current assignee: Hisense Broadband Multimedia Technology Co Ltd
Priority date: 2022-08-09
Filing date: 2022-08-09
Publication date: 2023-04-14
Anticipated expiration: 2032-08-09

Abstract

The application provides an optical module, including the round square tube body, the light emitting device, first light receiving element and second light receiving element, the light emitting device is used for launching OTDR emission light, first light receiving element is used for receiving the OTDR reverberation of reflecting back outside the module in order to realize the OTDR monitoring, the internal portion of round square tube is equipped with optical isolator, the spectroscope, the extinction piece, the reflector plate, first filter, the second filter, third filter and second lens, for this reason, be equipped with optical isolator in the round square tube body respectively and hold the chamber, the spectroscope holds the chamber, the extinction piece setting zone, the reflector plate holds the chamber, first filter setting zone, the second filter holds the chamber, the third filter holds chamber and the second lens holds the chamber; the round square tube body provided by the embodiment of the application is provided with each optical device through reasonable design, and then the light emitting device, the first light receiving device and the second light receiving device are arranged in the same tube body simultaneously.

Description

Optical module

Technical Field

The application relates to the technical field of optical communication, in particular to an optical module.

Background

With the development of Optical communication becoming faster and faster, optical fibers are laid more and more, and intelligent monitoring of Optical fiber resources becomes more and more urgent, so that most Optical modules start to be built with an OTDR (Optical Time Domain Reflectometer) function, and monitor the performance of the Optical fibers through the OTDR technology to determine events such as Optical fiber fusion joints, connectors, or breakage. The OTDR uses its laser light source to send optical pulse to the measured optical fiber, where the optical pulse has optical signal reflected back to the OTDR on the optical fiber itself and each characteristic point, and the reflected optical signal is coupled to the OTDR receiver through orientation and converted into electric signal, and finally the result curve is displayed on the display screen.

The optical module is usually provided with a single-fiber bidirectional and same-wavelength optical transceiver module (i.e. BOSA) to realize an OTDR function; an Optical module is usually provided with a ROSA (Optical receiver assembly) for receiving data light of another wavelength to realize an OSC (Optical supervisory channel) function; the optical module with one BOSA and one ROSA structure increases the size of the optical module, and is not beneficial to the small-size development of the optical module. How to design the tube body to simultaneously realize the OTDR function and the OSC function is a technical problem to be considered.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides an optical module to implement an OTDR function and an OSC function simultaneously through a reasonable design in a tube.

The optical module provided by the embodiment of the application comprises:

a circuit board;

an optical transceiver assembly electrically connected to the circuit board, comprising:

a round and square pipe body;

the light emitting device is connected with the first pipe orifice of the round and square pipe body and used for emitting OTDR (optical time Domain reflectometer) emitted light into the round and square pipe body, and the OTDR emitted light is used for OTDR detection;

the first optical receiving device is arranged in a second pipe orifice of the round and square pipe body and used for receiving OTDR reflected light which is reflected by the outside of the optical module and has the wavelength of the first wavelength, and the OTDR reflected light is used for OTDR detection;

the second light receiving device is arranged in a third tube opening of the round and square tube body and used for receiving OSC data light with the wavelength of a second wavelength from the outside of the optical module;

the optical assembly is arranged in the inner cavity of the round and square tube body and comprises an optical isolator, a light splitting piece, a light absorption piece, a first filter, a reflector, a second filter and a third filter;

the optical fiber adapter is connected with the fifth pipe orifice of the round and square pipe body and is used for connecting an external optical fiber;

the round and square pipe body is provided with the first pipe orifice, the second pipe orifice, the third pipe orifice, the fourth pipe orifice and the fifth pipe orifice on the side wall respectively, and the inside of the round and square pipe body is provided with:

the first cavity is arranged in the first pipe orifice and used for enabling the light emitting device and the optical isolator to avoid each other;

the isolator accommodating cavity is arranged in the first pipe orifice and used for arranging the optical isolator;

the light splitting piece accommodating cavity is arranged on the first inclined surface of the round and square tube body and comprises a butting surface, a supporting surface and a sticking surface;

the abutting surface is a side wall formed by the second inclined surface in a concave manner and is connected with the surface of the light splitting piece,

the supporting surface is a side wall formed by sinking the second inclined surface, is connected with the surface of the light splitting sheet and is perpendicular to the abutting surface to form a first right-angle clamping groove, and the first right-angle clamping groove is used for embedding the light splitting sheet;

the attaching surface is a side wall formed by sinking the second inclined surface, is connected with the surface of the light splitting sheet and is perpendicular to the supporting surface to form a second right-angle clamping groove, and the second right-angle clamping groove is used for embedding the light splitting sheet;

the second mouth of pipe, interior inlay is equipped with the baffle, the baffle includes:

a first light hole formed by recessing downward along the upper surface of the baffle plate to penetrate through the baffle plate, for allowing the OTDR reflected light to pass through the split light of the splitter plate so as to be emitted to the first filter plate;

the mounting groove is formed by upwards sinking along the lower surface of the baffle, extending towards the periphery of the baffle and extending relative to the first light-transmitting hole and is used for arranging the first filter sheet;

the second filter accommodating cavity is used for accommodating the second filter;

the reflector plate accommodating cavity is used for accommodating the reflector plate; the third filter accommodating cavity is used for arranging the third filter; a second lens accommodating cavity arranged at the fifth pipe orifice,

a second cavity, disposed at the fifth pipe orifice, for providing an adjustable space for coupling of the fiber adapter 900;

the fourth pipe orifice is provided with a light absorption sheet support accommodating cavity, the light absorption sheet support accommodating cavity is used for embedding the light absorption sheet, and the light absorption sheet support comprises a column body and a cover plate;

the light absorption sheet support accommodating cavity comprises a column accommodating cavity and a cover plate accommodating cavity which are arranged in a step shape;

the cylinder accommodating cavity is adapted to the cylinder so as to arrange the cylinder;

the cover plate accommodating cavity is matched with the cover plate to arrange the cover plate.

The optical module provided by the application comprises a round square tube body, an optical transmitter, a first optical receiver and a second optical receiver, wherein the optical transmitter is used for transmitting OTDR (optical time domain reflectometer) emitted light, the first optical receiver is used for receiving OTDR reflected light reflected back in an optical fiber link so as to realize OTDR monitoring, and the second optical receiver is used for receiving OSC (optical time domain reflectometer) data light from the outside of the optical module so as to realize OSC data transmission; the inside optical isolator that is equipped with of circle square tube internal body, the spectroscope, the extinction piece, the reflector plate, first filter plate, the second filter plate, third filter plate and second lens, for this reason, it holds the chamber to be equipped with optical isolator in the circle square tube respectively, the spectroscope holds the chamber, the extinction piece sets up the district, the reflector plate holds the chamber, first filter plate sets up the district, the second filter plate holds the chamber, the third filter plate holds the chamber and the second lens holds the chamber, wherein the extinction piece is located the circle square tube through the extinction piece support and is internal, consequently, it holds the chamber to be equipped with the extinction piece support in the circle square tube, first filter plate is located the circle square tube through the mounting groove on the baffle in vivo, consequently, the baffle is connected with the circle square tube. The round-square tube provided by the embodiment of the application is provided with the optical devices simultaneously through reasonable design, and then the light emitting device, the first light receiving device and the second light receiving device are arranged in the same tube simultaneously, so that the OTDR detection function and the OSC transmission function are realized in the same tube simultaneously.

Drawings

In order to more clearly illustrate the technical solutions of the present disclosure, the drawings required to be used in some embodiments of the present disclosure will be briefly described below, and it is apparent that the drawings in the following description are only drawings of some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art according to these drawings. Furthermore, the drawings in the following description may be considered as schematic diagrams, and do not limit the actual size of products, the actual flow of methods, the actual timing of signals, and the like, involved in the embodiments of the present disclosure.

FIG. 1 is a connection diagram of an optical communication system according to some embodiments;

FIG. 2 is a block diagram of an optical network terminal according to some embodiments;

FIG. 3 is a block diagram of a light module according to some embodiments;

FIG. 4 is an exploded view of a light module according to some embodiments;

FIG. 5 is a block diagram of an optical transceiver component of an optical module according to some embodiments;

FIG. 6 is an exploded view of an optical transceiver component of a light module according to some embodiments;

FIG. 7 is a cross-sectional view of an optical transceiver component of an optical module according to some embodiments;

FIG. 8 is a first optical diagram of an optical transceiver component of an optical module according to some embodiments;

FIG. 9 is a second optical path diagram of an optical transceiver component of an optical module according to some embodiments;

FIG. 10 is a third optical path diagram of an optical transceiver component of an optical module according to some embodiments;

fig. 11 is a first schematic view illustrating an assembly of a light emitting device and a light adapter in a light transceiving module of a light module according to some embodiments;

fig. 12 is a second schematic view illustrating an assembly of a light emitting device and a light adapter in a light transceiving module of a light module according to some embodiments;

fig. 13 is a third schematic view illustrating an assembly of a light emitting device and a light adapter in a light transceiving module of a light module according to some embodiments;

fig. 14 is a schematic view of an assembly of a light emitting device of a light module and a first adjustment sleeve according to some embodiments;

FIG. 15 is a schematic view of an assembly of a fiber optic adapter of an optical module with a second adjustment sleeve according to some embodiments;

fig. 16 is an assembly view of a first light receiving device in a light transceiving component of a light module according to some embodiments;

fig. 17 is an assembly diagram of a second light receiving device in a light transceiving component of a light module according to some embodiments;

fig. 18 is an exploded schematic view of a light emitting device and a first adjustment sleeve of a light transceiver component of a light module according to some embodiments;

FIG. 19 is an exploded view of a light emitting device of a light module according to some embodiments;

fig. 20 is an internal schematic view of a light emitting device of a light module according to some embodiments;

FIG. 21 is a cross-sectional view of a light emitting device of a light module according to some embodiments;

FIG. 22 is a partial cross-sectional view of a light emitting device of a light module according to some embodiments;

fig. 23 is a detailed schematic diagram of a light emitting device of a light module according to some embodiments;

fig. 24 is a cross-sectional view of a light emitting device of a light module according to some embodiments;

fig. 25 is a diagram of a backlight detector structure of a light emitting device of a light module according to some embodiments;

FIG. 26 is a schematic view of a header structure of a light emitting device of a light module according to some embodiments;

FIG. 27 is a cross-sectional view of a header structure of a light emitting device of a light module according to some embodiments;

FIG. 28 is a cross-sectional view of an optical transceiver component of an optical module according to some embodiments;

FIG. 29 is a cross-sectional view of an inner structure of a square tubular body in an optical transceiver module of an optical module according to some embodiments;

FIG. 30 is a cross-sectional view of an inner structure of a square tubular body in an optical transceiver module of an optical module according to some embodiments;

FIG. 31 is a first block diagram of a round and square tube in an optical transceiver module of an optical module according to some embodiments;

fig. 32 is a second structural view of a circular-square tube in an optical transceiver module of an optical module according to some embodiments;

FIG. 33 is a block diagram of a third embodiment of a round and square tube in an optical transceiver module of an optical module;

FIG. 34 is a cross-sectional view of a first circular tube in an optical transceiver module of an optical module according to some embodiments;

FIG. 35 is a cross-sectional view of a second round and square tube in an optical transceiver module of an optical module according to some embodiments;

fig. 36 is a third cross-sectional view of a circular-square tube in an optical transceiver component of an optical module according to some embodiments;

FIG. 37 is a first block diagram illustrating an assembly relationship between a round and square tube and a beam splitter of a light module according to some embodiments;

FIG. 38 is a second block diagram illustrating an assembly relationship between a round and square tube and a beam splitter of a photo module according to some embodiments;

FIG. 39 is a block diagram of a third exemplary embodiment of a round/square tube and a beam splitter of a light module;

FIG. 40 is a block diagram of a fourth exemplary embodiment of an assembly relationship between a round and square tube and a beam splitter of an optical module;

FIG. 41 is a block diagram of a round and square tube and a beam splitter of a photonic module according to some embodiments;

FIG. 42 is a block diagram of a sixth example of an assembled relationship between a round and square tube and a beam splitter of a light module;

FIG. 43 is a block diagram of an absorption sheet support inside a round-square tube of a light module according to some embodiments;

FIG. 44 is a block diagram of an absorption sheet support inside a round-square tube of a light module according to some embodiments;

FIG. 45 is a diagram of an assembly relationship of an absorption sheet support member and an absorption sheet of a light module according to some embodiments;

FIG. 46 is a cross-sectional view of an assembly of an absorber support member and an absorber of a light module according to some embodiments;

FIG. 47 is a cross-sectional view of an assembly relationship of an absorber support member and an absorber of a light module according to some embodiments;

FIG. 48 is an exploded view of an assembled relationship of an absorber support member and an absorber of a light module according to some embodiments;

FIG. 49 illustrates an assembly relationship between a light absorbing sheet supporting member and a circular-square tube of a light module according to some embodiments;

FIG. 50 is an exploded view of an assembled relationship of an absorber support member and a round-square tube of a light module according to some embodiments;

FIG. 51 is a cross-sectional view of an assembly of an absorber support member and a round-square tube of an optical module according to some embodiments;

FIG. 52 is an exploded view of an assembled relationship of a light absorbing sheet support member and a round and square tube body of a light module according to some embodiments;

FIG. 53 is a schematic diagram of the optical path of an optical module through a first filter and a baffle according to some embodiments;

fig. 54 is a schematic view of an assembly of a first filter and a baffle in a round-square tube of an optical module according to some embodiments;

FIG. 55 is a block diagram of a round square tube of an optical module to assemble a bezel according to some embodiments;

fig. 56 is an exploded view of the first filter and the baffle of the round-square tube of an optical module according to some embodiments;

FIG. 57 is an exploded view of a first filter and a baffle of a round-square tube of an optical module according to some embodiments;

fig. 58 is a schematic diagram illustrating a relative arrangement relationship between a first filter plate and a baffle of a light module according to some embodiments;

fig. 59 is an exploded view of a first filter and a baffle of a light module according to some embodiments;

fig. 60 is a schematic view illustrating an assembly relationship between a second filter and a circular-square tube of an optical module according to some embodiments;

FIG. 61 is an enlarged view of a second filter of an optical module according to some embodiments;

fig. 62 is an exploded view of a second filter of a light module according to some embodiments;

FIG. 63 is a diagram illustrating a second filter of an optical module in a round-square tube in accordance with some embodiments;

FIG. 64 is a schematic view of an assembled relationship between a reflective sheet and a circular-square tube of an optical module according to some embodiments;

FIG. 65 is an exploded view of an optical module according to some embodiments showing an assembly relationship between a reflective sheet and a circular-square tube;

fig. 66 is a block diagram of a round square tube body of an optical module for assembling a third filter according to some embodiments;

fig. 67 is a schematic view illustrating an assembly relationship between a circular-square tube and a third filter of an optical module according to some embodiments.

Detailed Description

In an optical communication system, an optical signal is used to carry information to be transmitted, and the optical signal carrying the information is transmitted to information processing equipment such as a computer through information transmission equipment such as an optical fiber or an optical waveguide, so as to complete information transmission. Since light has a passive transmission characteristic when transmitted through an optical fiber or an optical waveguide, low-cost and low-loss information transmission can be realized. Further, since a signal transmitted by an information transmission device such as an optical fiber or an optical waveguide is an optical signal and a signal that can be recognized and processed by an information processing device such as a computer is an electrical signal, it is necessary to perform interconversion between the electrical signal and the optical signal in order to establish an information connection between the information transmission device such as an optical fiber or an optical waveguide and the information processing device such as a computer.

The optical module realizes the function of interconversion between the optical signal and the electrical signal in the technical field of optical communication. The optical module comprises an optical port and an electrical port, the optical module realizes optical communication with information transmission equipment such as optical fibers or optical waveguides and the like through the optical port, realizes electrical connection with an optical network terminal (such as an optical modem) through the electrical port, and the electrical connection is mainly used for power supply, I2C signal transmission, data information transmission, grounding and the like; the optical network terminal transmits the electric signal to the computer and other information processing equipment through a network cable or a wireless fidelity (Wi-Fi).

Fig. 1 is a connection diagram of an optical communication system. As shown in fig. 1, the optical communication system includes a remote server 1000, a local information processing device 2000, an optical network terminal 100, an optical module 200, an optical fiber 101, and a network cable 103.

One end of the optical fiber 101 is connected to the remote server 1000, and the other end is connected to the optical network terminal 100 through the optical module 200. The optical fiber itself can support long-distance signal transmission, for example, signal transmission of several kilometers (6 kilometers to 8 kilometers), on the basis of which if a repeater is used, theoretically, infinite distance transmission can be realized. Therefore, in a typical optical communication system, the distance between the remote server 1000 and the onu 100 may be several kilometers, tens of kilometers, or hundreds of kilometers.

One end of the network cable 103 is connected to the local information processing device 2000, and the other end is connected to the optical network terminal 100. The local information processing device 2000 may be any one or several of the following devices: router, switch, computer, cell-phone, panel computer, TV set etc..

The physical distance between the remote server 1000 and the optical network terminal 100 is greater than the physical distance between the local information processing apparatus 2000 and the optical network terminal 100. The connection between the local information processing apparatus 2000 and the remote server 1000 is made by the optical fiber 101 and the network cable 103; and the connection between the optical fiber 101 and the network cable 103 is completed by the optical module 200 and the optical network terminal 100.

The optical module 200 includes an optical port configured to access the optical fiber 101 and an electrical port, so that the optical module 200 establishes a bidirectional optical signal connection with the optical fiber 101; the electrical port is configured to be accessed into the optical network terminal 100, so that the optical module 200 establishes a bidirectional electrical signal connection with the optical network terminal 100. The optical module 200 converts an optical signal and an electrical signal to each other, so that an information connection is established between the optical fiber 101 and the optical network terminal 100. For example, an optical signal from the optical fiber 101 is converted into an electrical signal by the optical module 200 and then input to the optical network terminal 100, and an electrical signal from the optical network terminal 100 is converted into an optical signal by the optical module 200 and input to the optical fiber 101. Since the optical module 200 is a tool for realizing the interconversion between the optical signal and the electrical signal, and does not have a function of processing data, information is not changed in the above-mentioned photoelectric conversion process.

The optical network terminal 100 includes a housing (housing) having a substantially rectangular parallelepiped shape, and an optical module interface 102 and a network cable interface 104 provided on the housing. The optical module interface 102 is configured to access the optical module 200, so that the ont 100 establishes a bidirectional electrical signal connection with the optical module 200; the network cable interface 104 is configured to access the network cable 103 such that the optical network terminal 100 establishes a bi-directional electrical signal connection with the network cable 103. The optical module 200 is connected to the network cable 103 via the optical network terminal 100. For example, the optical network terminal 100 transmits the electrical signal from the optical module 200 to the network cable 103, and transmits the electrical signal from the network cable 103 to the optical module 200, so that the optical network terminal 100 can monitor the operation of the optical module 200 as an upper computer of the optical module 200. The upper computer of the Optical module 200 may include an Optical Line Terminal (OLT) in addition to the Optical network Terminal 100.

The remote server 1000 establishes a bidirectional signal transmission channel with the local information processing device 2000 through the optical fiber 101, the optical module 200, the optical network terminal 100, and the network cable 103.

Fig. 2 is a configuration diagram of the optical network terminal, and fig. 2 only shows a configuration of the optical module 200 of the optical network terminal 100 in order to clearly show a connection relationship between the optical module 200 and the optical network terminal 100. As shown in fig. 2, the optical network terminal 100 further includes a circuit board 300 disposed within the housing, a cage 106 disposed on a surface of the circuit board 300, a heat sink 107 disposed on the cage 106, and an electrical connector disposed inside the cage 106. The electrical connector is configured to access an electrical port of the optical module 200; the heat sink 107 has a projection such as a fin that increases a heat radiation area.

The optical module 200 is inserted into a cage 106 of the optical network terminal 100, the cage 106 holds the optical module 200, and heat generated by the optical module 200 is conducted to the cage 106 and then diffused by a heat sink 107. After the optical module 200 is inserted into the cage 106, an electrical port of the optical module 200 is connected to an electrical connector inside the cage 106, so that the optical module 200 is connected to the optical network terminal 100 by a bidirectional electrical signal. Further, the optical port of the optical module 200 is connected to the optical fiber 101, and the optical module 200 establishes bidirectional optical signal connection with the optical fiber 101.

Fig. 3 is a block diagram of a light module according to some embodiments. As shown in fig. 3, the optical module 200 includes a housing (shell), a circuit board 300 disposed in the housing, and an optical transceiver module.

The shell comprises an upper shell 201 and a lower shell 202, wherein the upper shell 201 is covered on the lower shell 202 to form the shell with two openings; the outer contour of the housing generally appears square.

In some embodiments of the present disclosure, the lower housing 202 includes a bottom plate 2021 and two lower side plates 2022 located at both sides of the bottom plate 2021 and disposed perpendicular to the bottom plate 2021; the upper case 201 includes a cover 2011, and the cover 2011 covers the two lower side plates 2022 of the lower case 202 to form the above case.

In some embodiments, the lower housing 202 includes a bottom plate 2021 and two lower side plates 2022 located at both sides of the bottom plate 2021 and disposed perpendicular to the bottom plate 2021; the upper case 201 includes a cover plate 2011 and two upper side plates which are located on two sides of the cover plate 2011 and are perpendicular to the cover plate 2011, and the two upper side plates and the two lower side plates 2022 are combined to cover the upper case 201 on the lower case 202.

The direction of the connecting line of the two

openings

204 and 205 may be the same as the length direction of the optical module 200, or may not be the same as the length direction of the optical module 200. For example, the opening 204 is located at an end portion (right end in fig. 3) of the optical module 200, and the opening 205 is also located at an end portion (left end in fig. 3) of the optical module 200. Alternatively, the opening 204 is located at an end of the optical module 200, and the opening 205 is located at a side of the optical module 200. The opening 204 is an electrical port, and a gold finger of the circuit board 300 extends out of the opening 204 and is inserted into an upper computer (for example, the optical network terminal 100); the opening 205 is an optical port configured to access the external optical fiber 101, so that the external optical fiber 101 is connected to an optical transceiver module inside the optical module 200.

The upper shell 201 and the lower shell 202 are combined in an assembly mode, so that the circuit board 300, the optical transceiver module and other devices can be conveniently installed in the shells, and the upper shell 201 and the lower shell 202 form encapsulation protection for the devices. In addition, when the circuit board 300, the optical transceiver module and other devices are assembled, the positioning components, the heat dissipation components and the electromagnetic shielding components of the devices are convenient to arrange, and the automatic production is facilitated.

In some embodiments, the upper housing 201 and the lower housing 202 are generally made of a metal material, which is beneficial to achieve electromagnetic shielding and heat dissipation.

In some embodiments, the optical module 200 further includes an unlocking component 203 located outside the housing thereof, and the unlocking component 203 is configured to implement a fixed connection between the optical module 200 and an upper computer or release the fixed connection between the optical module 200 and the upper computer.

Illustratively, the unlocking member is located on the outer wall of the two lower side plates 2022 of the lower housing 202, and has a snap-fit member that matches with a cage of the upper computer (e.g., the cage 106 of the optical network terminal 100). When the optical module 200 is inserted into the cage of the upper computer, the optical module 200 is fixed in the cage of the upper computer by the engaging member of the unlocking member; when the unlocking member is pulled, the engaging member of the unlocking member moves along with the unlocking member, and further the connection relationship between the engaging member and the upper computer is changed, so that the engagement relationship between the optical module 200 and the upper computer is released, and the optical module 200 can be drawn out from the cage of the upper computer.

The circuit board 300 includes circuit traces, electronic components, and chips, and the electronic components and the chips are connected together by the circuit traces according to a circuit design to implement functions of power supply, electrical signal transmission, grounding, and the like. Examples of the electronic components include capacitors, resistors, transistors, and Metal-Oxide-Semiconductor Field-Effect transistors (MOSFETs). The chip includes, for example, a Micro Controller Unit (MCU), a laser driver chip, a limiting amplifier (limiting amplifier), a Clock and Data Recovery (CDR) chip, a power management chip, and a Digital Signal Processing (DSP) chip.

The circuit board 300 is generally a rigid circuit board, which can also perform a bearing function due to its relatively rigid material, for example, the rigid circuit board can stably bear the electronic components and chips; when the optical transceiver component is positioned on the circuit board, the rigid circuit board can also provide smooth bearing; the rigid circuit board can also be inserted into an electric connector in the cage of the upper computer.

The circuit board 300 further includes a gold finger formed on an end surface thereof, the gold finger being composed of a plurality of pins independent of each other. The circuit board 300 is inserted into the cage 106 and electrically connected to the electrical connector in the cage 106 by gold fingers. The gold fingers may be disposed on only one side of the circuit board 300 (e.g., the upper surface shown in fig. 4), or may be disposed on both upper and lower sides of the circuit board 300, so as to adapt to the situation where the requirement of the number of pins is large. The golden finger is configured to establish an electrical connection with the upper computer to realize power supply, grounding, I2C signal transmission, data signal transmission and the like.

Of course, a flexible circuit board is also used in some optical modules. Flexible circuit boards are generally used in conjunction with rigid circuit boards to supplement the rigid circuit boards. For example, a flexible circuit board may be used to connect the rigid circuit board and the optical transceiver module.

The optical transceiving component comprises an optical transmitting device and an optical receiving device, wherein the optical transmitting device is configured to transmit optical signals, and the optical receiving device is configured to receive the optical signals. Illustratively, the light emitting device and the light receiving device are combined together to form an integrated light transceiving component.

The packaging mode of the optical transceiver component is multiple, in the embodiment of the application, the optical transmitter and the optical receiver adopt TO package, the optical transmitter and the optical receiver can be electrically connected with the circuit board 300 through the flexible circuit board, one end of the flexible circuit board is electrically connected with the optical transmitter or the optical receiver, and the other end of the flexible circuit board is electrically connected with the circuit board 300.

The Optical module may have multiple functions, such as an OSC (Optical supervisory channel) for transmitting monitoring information.

The Optical module may have a plurality of functions, such as an OTDR (Optical Time Domain Reflectometer) function, where the OTDR transmits an Optical pulse into an Optical fiber, and when the Optical pulse is transmitted in the Optical fiber, scattering and reflection are generated due to an Optical link abnormality such as a property of the Optical fiber itself, a connector, an interruption, or a bend, and a part of a scattered light signal and a reflected light signal may return to the OTDR, and the OTDR determines whether the Optical link is abnormal according to a Time Domain characteristic of the received scattered light signal and the received reflected light signal.

An optical module system with OTDR function generally includes a pair of optical modules with OTDR function, which are respectively referred to as a first optical module and a second optical module. The first OTDR BOSA emits first wavelength light and receives the first wavelength light reflected back due to the abnormal optical link; the first OSC ROSA receives the second wavelength of light. The second OTDR BOSA emits second-wavelength light and receives the second-wavelength light reflected back due to the abnormal optical link; the second OSC ROSA receives the first wavelength of light. In the prior art, the OTDR BOSA and OSC ROSA are disposed in two different tubes, which occupies a large area and is not favorable for the miniaturization development of the optical module.

In the embodiment of the application, the OTDR BOSA and the OSC ROSA are arranged in the same tube body, so that the device is more miniaturized.

As shown in fig. 5, in the embodiment of the present application, the optical module includes a light emitting device 500, a first light receiving device 600, a second light receiving device 700, a round and square tube 400, and a fiber adapter 900. The light emitting device 500, the first light receiving device 600, the second light receiving device 700, and the optical fiber adapter 900 are respectively disposed on the side wall of the round-square tube 400.

Fig. 31, 32, and 33 show the structure of a round and square tube 400, wherein a first tube opening 410 is disposed on a first sidewall of the round and square tube 400, a second tube opening 420 is disposed on a second sidewall, a third tube opening 430 and a fourth tube opening 440 are respectively disposed on the third sidewall, and a fifth tube opening 450 is disposed on the fourth sidewall; the first side wall and the fourth side wall are arranged oppositely and are positioned in the length direction of the round and square pipe body 400, and the second side wall and the third side wall are arranged oppositely and are positioned in the width direction of the round and square pipe body 400; further, the first nozzle 410 protrudes with respect to the circular tube 400.

As shown in fig. 11, the light emitting device 500 is connected to the round and square tube body 400 through a connection sleeve 510; the area of the end surface of the connecting sleeve 510 is larger than that of the end surface of the light emitting device 500, so that the connecting sleeve 510 can facilitate the welding of the light emitting device 500 and the round and square tube 400, increase the welding area between the light emitting device 500 and the round and square tube 400, and increase the welding firmness; the light emitting device 500 is embedded in the coupling sleeve 510, and the structure after embedding is shown in fig. 14; then the end surface of the connecting sleeve 510 is welded with the end surface of the first pipe orifice 410, so that mechanical flatting and mechanical connection are realized; in this embodiment, since the first lens 543 is disposed in the light emitting device 500, the first lens 543 is a collimating lens, and the light emitted by the light emitting device 500 is parallel light, the light emitting device 500 performs XY plane coupling; in coupling, the light emitting device 500 and the connecting sleeve 510 perform XY plane coupling with the round-square tube 400 as a reference, and the coupling is performed to the maximum light emitting power; specifically, the light emitting device 500 is embedded into the connection sleeve 510, and then XY plane coupling is performed, and when the coupling is performed until the light emitting power is maximum, the end surface of the connection sleeve 510 and the end surface of the first pipe orifice 410 are welded, so that mechanical leveling and mechanical connection are achieved. Here, the XY plane means that a line from the light emitting device 500 to the fiber adapter 900 in fig. 11 is an axis, and a plane perpendicular to the axis is the XY plane. As can be seen from fig. 12 and 13, the relative position between the end surface of the connecting sleeve 510 and the end surface of the first nozzle 410 allows for better mechanical leveling and welding between the end surface of the connecting sleeve 510 and the end surface of the first nozzle 410. Further, when the first pipe orifice 410 protrudes relative to the round and square pipe body 400, the welding between the connecting sleeve 510 and the round and square pipe body 400 is facilitated, and when the first pipe orifice 410 does not protrude relative to the round and square pipe body 400, the connecting sleeve 510 and the first side wall of the round and square pipe body 400 can also be welded together.

As shown in fig. 16, the first light receiving device 600 is fitted inside the second nozzle 420; as shown in fig. 17, second light receiving device 700 is fitted inside third nozzle 430.

As shown in fig. 11, 12 and 13, the optical fiber adapter 900 is connected to the round and square tube 400 through the adjusting sleeve 910, and the adjusting sleeve 910 is disposed to better connect the optical fiber adapter 900 to the round and square tube 400 on the one hand and to facilitate optical coupling, especially Z-axis coupling, of the optical fiber adapter 900 on the other hand; the fiber optic adapter 900 is inserted into the adjusting sleeve 910, the inserted configuration being shown in FIG. 15; then, the end face of the adjusting sleeve 910 is welded with the side wall where the fifth pipe orifice 450 is located, so that mechanical flattening and mechanical connection are realized; in the embodiment of the present application, light emitted from the optical fiber adapter 900 is converging light, and light entering the optical fiber adapter 900 is also converging light, so that the optical fiber adapter 900 performs XYZ coupling, and when coupling is performed, the optical fiber adapter 900 performs XYZ coupling to the maximum light emission power with the round-square tube 400 as a reference; specifically, the optical fiber adapter 900 is embedded into the adjusting sleeve 910, the adjusting sleeve 910 performs XY plane coupling with the optical fiber adapter 900, and meanwhile, the optical fiber adapter 900 also performs Z axis coupling, when the coupling reaches the maximum light emission power, the side surface of the adjusting sleeve 910 is penetration-welded to the side wall of the optical fiber adapter 900, then the adjusting sleeve 910 is mechanically flush with the side wall where the fifth pipe orifice 450 is located, and then XY plane coupling is performed, and when the coupling reaches the maximum light emission power, the end surface of the adjusting sleeve 910 is welded to the side wall where the fifth pipe orifice 450 is located; as shown in fig. 15, the optical fiber adapter 900 includes an optical fiber ferrule 920, when the optical fiber adapter 900 performs Z-axis coupling, the optical fiber adapter 900 performs Z-axis adjustment along the adjustment sleeve 910, and a small portion of the end of the optical fiber ferrule 920 enters the inside of the round-square tube 400, so that the end of the round-square tube 400 is provided with a second cavity 407, and the second cavity 407 provides a moving space for the optical fiber ferrule 920 when the optical fiber adapter 900 performs Z-axis coupling; when the fiber optic adapter 900 is coupled, the end of the fiber stub 920 may extend more or less into the second cavity 407. In the XYZ direction, a line connecting the light emitting device 500 to the optical fiber adapter 900 in fig. 11 is an axis, the axis extends in the Z-axis direction, and a plane perpendicular to the axis is an XY plane.

In order to prevent light from returning along the original optical path, the optical path is designed to enable the light to be incident on the end face of the optical fiber in a non-vertical mode; in order to realize the non-vertical incidence of the optical fiber end face, the optical fiber end face is ground into an inclined plane, specifically, the optical fiber is wrapped in ceramic to form the optical fiber ferrule 920, the end face of the optical fiber ferrule 920 is ground into the inclined plane, and then the optical fiber end face in the optical fiber ferrule 920 is inclined.

As shown in fig. 6 and 7, the optical element is disposed inside the circular tube 400, and the optical isolator 810, the spectroscope 820, the light absorbing plate 830, the first filter 850, the baffle 840, the second filter 860, the reflector 870, the third filter 880, and the second lens 890 are sequentially disposed therein. The second lens 890 has a converging function toward an end surface (first end surface) inside the circular-square tube 400, and has a collimating function toward an end surface (second end surface) outside the circular-square tube 400, and the light emitting device 500 emits parallel light, and performs long-distance transmission in a state of the parallel light; when entering the fiber adapter 900 through the second lens 890, the first end surface of the second lens 890 converts the parallel light into converging light, and the converging light enters the fiber through the fiber adapter 900; when external light (condensed light) enters the fiber adapter 900, the second end surface of the second lens 890 converts the condensed light into parallel light, and the parallel light enters the circular-square tube 400. The optical axes of the optical isolator 810 and the light splitter 820 are on the same horizontal line, the light absorption sheet 830 and the first filter 850 are respectively arranged at two sides of the light splitter 820, the light absorption sheet 830 is arranged on a reflection light path of the first wavelength emission light passing through the light splitter 820, and the first filter 850 is arranged in the reverse direction of the reflection light path of the first wavelength emission light passing through the light splitter 820; the optical axes of the second filter 860 and the spectroscopic plate 820 are on the same horizontal line, the reflective plate 870 is disposed on the reflection light path of the second filter 860 for the OSC data light, and the third filter 880 is disposed on the reflection light path of the reflective plate 870 for the OSC data light. Through optical elements such as the optical isolator 810, the beam splitter 820, the light absorption plate 830, the first filter 850, the baffle 840, the second filter 860, the reflector 870, the third filter 880 and the second lens 890, the emission of the emitted light with the first wavelength can be realized, the reception of OTDR reflected light can also be realized, meanwhile, the reception of OSC data light can also be realized, and then, the OTDR and OSC dual channels are simultaneously arranged in the circular tube 400.

In this embodiment of the application, light emitted by the light emitting device 500 is OTDR reflected light, and when the OTDR reflected light emitted by the light emitting device is transmitted in an optical fiber, the OTDR reflected light reflected back when an optical fiber link is abnormal is transmitted through the optical fiber adapter 900, and is finally transmitted into the first optical receiving device 600, and then OTDR detection is performed; the second wavelength light emitted by the opposite-end optical module is transmitted to the second light receiving device 700 through the optical fiber adapter 900; the first wavelength and the second wavelength are different wavelengths; the first wavelength light emitted from the light emitting device 500 is referred to as OTDR emission light, the first wavelength light reflected to the first light receiving device 600 is referred to as OTDR reflection light, and the second wavelength light transmitted to the second light receiving device 700 is referred to as OSC data light. The beam splitter 820 is semi-transparent and semi-reflective for light of the first wavelength; the second filter 860 transmits the first wavelength and reflects the second wavelength; the reflective sheet 870 reflects the second wavelength; first filter 850 allows only light of a first wavelength to transmit, and does not allow other wavelengths to transmit; the third filter 880 allows only light of the second wavelength to transmit and does not allow other wavelengths to transmit.

The OTDR emits light with a first wavelength for OTDR detection; after passing through the optical isolator 810 and passing through the beam splitter 820, because the beam splitter 820 is semi-transparent and semi-reflective, part of the OTDR emission light is transmitted through the beam splitter 820 to obtain first split of the OTDR emission light, and part of the OTDR emission light is reflected through the beam splitter 820 to obtain second split of the OTDR emission light; the OTDR emission light reflected by the spectroscopic sheet 820 (i.e., the OTDR emission light second split) causes crosstalk to the first light receiving device 600, and thus the OTDR emission light second split is crosstalk light; since crosstalk light is diffusely reflected in the circular and square tube 400 and enters the first optical receiver 600 to cause crosstalk, the crosstalk affects an attenuation blind area of the OTDR, causing a large attenuation blind area of the OTDR, and further affecting monitoring performance of the OTDR, the light absorbing sheet 830 is disposed on a light path of OTDR emission light reflected by the light splitting sheet 820, and the light absorbing sheet 830 can absorb the crosstalk light to prevent the crosstalk light from entering the first optical receiver 600 to cause interference to the OTDR. Part of the OTDR emission light is transmitted through the beam splitter 820, then transmitted through the second filter 860, and enters the second lens 890, and the second lens 890 is set as a converging lens, and after passing through the second lens 890, the converging light is emitted through the optical fiber adapter 900.

The OTDR reflected light, the wavelength is the first wavelength, it is reflected and got by OTDR emitted light when meeting the abnormal situation in the transmission in the optical fiber link; after being transmitted by the optical fiber adapter 900 and passing through the second lens 890, the optical fiber enters the round and square tube 400, is transmitted through the second filter 860 and reaches the beam splitter 820, and is transmitted and reflected by the beam splitter 820 to obtain first OTDR reflected light and second OTDR reflected light; the OTDR reflected light second split reaches the first filter 850, thereby entering the first light receiving device 600; the first split light of the OTDR reflected light reaches the optical isolator 810, so that under the action of the optical isolator 810, the stray light entering the light emitting device 500 is isolated, the quality of the emitted light signal of the light emitting device 500 is prevented from being affected by the stray light, and the emission performance of the light emitting device 500 is improved. Optical isolator 810 is used to prevent OTDR reflected light from being injected into optical emitter device 500, as well as to prevent OTDR reflected light from being injected into optical emitter device 500. The presence of optical isolator 810 may improve the emission performance of optical transmitter device 500 and thus improve OTDR detection performance.

OSC data light, the wavelength of which is the second wavelength, is transmitted through the optical fiber adapter 900, enters the round-square tube 400 after passing through the second lens 890, and is reflected by the second filter 860, so that the transmission direction of the light is changed; the OSC data light reaches the reflective sheet 870, is reflected by the reflective sheet 870, changes the transmission direction of the light again, and reaches the third filter 880, and the third filter 880 transmits the OSC data light, so that the OSC data light reaches the second light receiving device 700. Further, the second filter 860 is an 11 ° filter, that is, the angle between the incident light and the normal of the second filter 860 is 11 °, the angle between the emergent light and the normal is 11 °, and further the angle between the incident light and the emergent light of the second filter 860 is 22 °; the reflector 870 is a 34-degree reflector, that is, an angle between incident light of the reflector 870 and a normal is 34 degrees, an angle between emergent light and the normal is 34 degrees, and an angle between the incident light of the reflector 870 and the emergent light is 68 degrees; finally, the transmission direction of the OSC data light is changed by 90 °, that is, the OSC data light horizontally enters the second filter 860, passes through the reflector 870, and then vertically enters the third filter 880, and the third filter 880 transmits the OSC data light, so that the OSC data light reaches the second light-receiving device 700. Therefore, in the embodiment of the present application, the transmission direction of the OSC data light is adjusted to be transmitted in the direction perpendicular to the third filter 880 from the direction along the optical axis of the fiber adapter 900 by the combination of the 11 ° second filter 860 and the 34 ° reflector 870.

In the embodiment of the present application, at the transmitting end, the OTDR emission light needs to transmit through the beam splitter 820, and at the receiving end, the OTDR reflection light needs to be reflected by the beam splitter 820, so that the transmission direction of the light is changed, and the light enters the first light receiving device 600, and therefore, the beam splitter 820 is semi-transparent and semi-reflective; the semi-transmission and semi-reflection refers to the even division of the light power, and the wavelengths of the two beams of light after the division are the same as the wavelengths of the two beams of light before the division, namely the wavelengths of the two beams of light before and after the division are not changed; when the OTDR emission light is emitted, in order to avoid that the OTDR emission light second split light enters the first light receiving device 600 to affect the OTDR detection performance, the light absorbing sheet 830 is provided; when receiving the OTDR reflected light, in order to prevent the first split light of the OTDR reflected light from entering the light emitting device 500 to affect the emission performance, an optical isolator 810 is provided; in order to prevent light of the second wavelength from entering the first light receiving device 600, a first filter 850 is provided, and the first filter 850 allows only light of the first wavelength to transmit, and does not allow light of other wavelengths to transmit; in order to prevent the light with the first wavelength from entering the second light receiving device 700, a third filter 880 is provided, and the third filter 880 only allows the light with the second wavelength to transmit, but does not allow the light with other wavelengths to transmit; therefore, each structural design of the device is ingenious, and the rings are buckled and matched with each other.

Fig. 8, 9, and 10 are schematic optical path diagrams of OTDR emitted light, OTDR reflected light, and OSC data light, respectively.

Fig. 8 shows the optical path design of OTDR emitted light, which sequentially passes through an optical isolator 810, a splitter 820, a second filter 860, and a second lens 890 to reach a fiber adapter 900, and then is emitted into a fiber through the fiber adapter 900; although the majority of the second split light (i.e. the crosstalk light) emitted from the OTDR is absorbed by the light-absorbing sheet 830, a small portion of the second split light is still not absorbed by the light-absorbing sheet 830, and the light not absorbed by the light-absorbing sheet 830 exists inside the round and square tube 400 and is diffusely reflected; for this purpose, a baffle 840 is arranged in the reverse direction of the optical path of the second split light emitted by the OTDR, and a first filter 850 is arranged on the lower surface of the baffle 840; as shown in fig. 58 and 59, the baffle 840 is provided with a first light-transmitting hole 841 and a mounting groove 842, the first light-transmitting hole 841 is formed by recessing the upper surface of the baffle 840 downward until the first filter is exposed, and the mounting groove 842 is formed by recessing the lower surface of the baffle 840 upward until the first filter 850 can be mounted; specifically, the first light-transmitting hole 841 is disposed at the center of the baffle 840 and is a through hole, the mounting groove 842 takes the first light-transmitting hole 841 as the center, the lower surface of the baffle 840 is recessed upward, and the extending diameter extending toward the outer circumference of the baffle 840 is formed to be larger than the inner diameter of the first light-transmitting hole 841, and then the inner diameter of the first light-transmitting hole 841 is smaller than that of the mounting groove 842; the first light-transmitting hole 841 is for allowing OTDR reflected light to be transmitted to the surface of the first filter 850 to be transmitted to the inside of the first light receiving device 600; the mounting groove 842 is used for mounting the first filter 850, and since the extension diameter of the mounting groove 842 is greater than the inner diameter of the first light transmission hole 841, the first filter 850 may be disposed on the upper surface of the mounting groove 842. In order to prevent crosstalk light from being incident into the first light receiving device 600, an absorption layer is disposed on the surface of the baffle 840, and the edge of the baffle 840 is hermetically connected to the inside of the circular tube 400 by black glue. The absorbing layer is a structural layer obtained by blackening the baffle 840. On one hand, the absorption layer on the surface of the baffle 840 can absorb the crosstalk light, and on the other hand, the edge of the baffle 840 is hermetically connected with the inside of the round and square tube 400 through the black glue, so that the crosstalk light, and any light belonging to stray light for the first light receiving device 600, can be blocked or intercepted; interference of crosstalk light and stray light to the first light receiving device 600 is further reduced. Therefore, in the embodiment of the present application, most of the crosstalk light is absorbed by the light absorbing sheet 830, and the crosstalk light and the stray light are absorbed and intercepted by the baffle 840, so that the receiving performance of the first optical receiving device 600 is improved, and the detection accuracy of the OTDR is improved. The stray light may be that, when the second wavelength reflected light enters the second filter 860, although most of the second wavelength reflected light may be reflected by the second filter 860, a small portion of the second wavelength reflected light is still transmitted through the second filter 860, and the portion of the second wavelength reflected light transmitted through the second filter 860 is the stray light for the first light receiving device 600.

Fig. 9 shows an optical path design of OTDR reflected light, where the OTDR reflected light sequentially passes through the optical fiber adapter 900, the second lens 890, and the second filter 860 and is transmitted to the splitter 820, a part of the OTDR reflected light is reflected by the splitter 820 and enters the first filter 850 to reach the first light receiving device 600, and a part of the OTDR reflected light is transmitted by the splitter 820 and enters the optical isolator 810, and the first split of the OTDR reflected light is prevented from entering the light emitting device 500 by the isolation effect of the optical isolator 810, so that the emission performance of the light emitting device 500 is improved.

Fig. 10 shows the optical path design of the OSC data light, which is transmitted through the optical fiber adapter 900, converged by the second lens 890, enters the circular tube 400, and is reflected by the second filter 860 to change the transmission direction of the light; the light reaches the reflective sheet 870, is reflected by the reflective sheet 870, changes the transmission direction of the light again, and reaches the third filter 880, and the third filter 880 transmits the OSC data light, so that the OSC data light reaches the second light-receiving device 700. In the embodiment of the present application, under the combination of the 11 ° second filter 860 and the 34 ° reflector 870, the transmission direction of the OSC data light is adjusted to be transmitted in a direction perpendicular to the third filter 880 from the direction along the optical axis of the fiber adapter 900.

Fig. 18 to 27 are schematic structural views of a light emitting device 500 in the embodiment of the present application. As shown in fig. 18, the light emitting device 500 is connected to the connection sleeve 510, and is connected to the round tube 400 through the connection sleeve 510. The light emitting device 500 includes a cap 520 and a stem 530; the pipe cap 520 covers the surface of the pipe seat 530; a cavity is formed between the cap 520 and the socket 530; the surface of the tube seat 530 is provided with a boss 542; a light window 541 is arranged between the boss 542 and the top end of the tube cap. The surface of the boss 542 is provided with a first lens 543 and a laser chip 544, respectively. In some embodiments of the present disclosure, the optical window 541 is inclined at a certain angle with respect to the top surface of the cap, and the optical window 541 and the top surface of the cap (or the surface of the stem 530) form an inclination angle of 4 ° to 8 °, so as to prevent the optical signal reflected when passing through the optical window 541 from returning to the laser chip 544 along the original path to affect the light emission performance.

The boss 542 is provided with a first supporting surface 5421 and a second supporting surface 5422, the first supporting surface 5421 is recessed relative to the second supporting surface 5422, the first supporting surface 5421 and the second supporting surface 5422 are arranged in a step manner, and a step 5423 is arranged between the first supporting surface 5421 and the second supporting surface 5422; the first supporting surface 5421 and the second supporting surface 5422 are respectively used for arranging the first lens 543 and the laser chip 544; the first lens 543 and the laser chip 544 are respectively pasted by glue, glue overflow occurs, so that the step 5423 is obliquely arranged, further, the step 5423 is inclined towards the inner side of the boss 542, and thus the step 5423 has a glue guiding function; when the first lens 543 is attached, the overflow glue flows to the surface of the step 5423, so as to prevent the glue-climbing from occurring to affect the coupling efficiency of the light emitting device 500. Further, in the embodiment of the present application, the boss 542 and the tube seat 530 are integrally disposed, so as to ensure that the concentricity of the first lens 543 and the laser chip 544 carried on the surface of the boss 542 is fixed relative to the tube seat 530, thereby increasing the light emission coupling efficiency.

The first lens 543 is set as a collimating lens, the light beam emitted by the laser chip 544 is a diverging light beam, and the first lens 543 is used for converting the diverging light beam into parallel light; then, the parallel light is transmitted inside the round and square tube 400, sequentially passes through the optical isolator 810, the beam splitter 820 and the second filter 860, and then enters the second lens 890, the second lens 890 converts the parallel light into converging light, and the converging light enters the fiber through the optical fiber adapter 900. In the related conventional technology, the collecting lens is usually disposed inside the light emitting device 500, or disposed near the light emitting device 500, because a certain distance exists between the light emitting device 500 and the optical fiber adapter 900, the focal length of the collecting lens is relatively long, and further the optical coupling efficiency is relatively low, and the collected light coming out from the collecting lens enters the optical fiber after passing through the optical device, such as a filter, a reflector, etc., so that the collected light has losses such as insertion loss and return loss, and the optical coupling efficiency is further reduced. In the embodiment of the present application, the second lens 890 is disposed between each optical element and the optical fiber adapter 900, so that the focal length angle of the second lens 890 is increased, and the optical coupling efficiency is improved; and after passing through each optical element, the parallel light is converted into convergent light, so that loss of the convergent light due to the influence of each optical element is avoided, and the optical coupling efficiency is further improved. Therefore, in the embodiment of the present application, the light emitting device 500 emits parallel light, and then the parallel light is transmitted inside the round-square tube 400 until the parallel light is transmitted to the second lens 890 disposed between each optical element and the optical fiber adapter 900, and then the parallel light is converted into converging light, and the converging light directly enters the optical fiber through the optical fiber adapter 900.

As shown in fig. 7, in the embodiment of the present invention, a first lens 543 is disposed inside the light emitting device 500, and a second lens 890 is disposed between each optical element in the circular tube 400 and the optical fiber adapter 900; the first lens 543 and the second lens 890 form a dual-lens system of the optical transceiver; through the dual-lens system, the light emitting device 500 emits parallel light under the action of the first lens 543, and the light beam is transmitted in a parallel light state in the round-square tube 400 before the second lens 890; after passing through the optical elements, the parallel light is converted into converging light by the second lens 890, and the converging light is transmitted into the optical fiber adapter 900 and then enters the optical fiber. According to the embodiment of the application, the double-lens system can realize transmission in a parallel light state before entering the optical fiber, and the parallel light is converted into convergent light when entering the optical fiber so as to enter the optical fiber in a convergent light state. Through the two-lens system in this application, can reduce the focus of second lens 890, reduce simultaneously and assemble light energy loss, and then improve optical coupling efficiency, improve light-emitting efficiency, and then promote OTDR emission performance.

The surface of the tube seat 530 is also provided with a cushion block 545, and the surface of the cushion block 545 is provided with a backlight detector 546; the backlight detector 546 is configured to monitor the output power of the laser chip 544, so as to ensure that the output power of the laser chip 544 is maintained within a predetermined range; since the backlight detector 546 has a photosensitive surface and a certain reflectivity, in order to prevent the light beam incident on the backlight detector 546 from returning to the laser chip 544 along the original path and affecting the emission performance of the laser chip 544 in the embodiment of the present application, the surface of the stem 530 has an inclined supporting surface 534, the inclined supporting surface 534 has an inclined angle with respect to the stem, specifically, the inclined supporting surface 534 is inclined upward toward the opposite surface of the top surface of the stem 530; the spacers 545 and the backlight detector 546 are disposed on the inclined supporting surface 534 to prevent the light beam incident on the backlight detector 546 from returning to the laser chip 544 along the original path and affecting the emission performance of the laser chip 544.

The surface of the tube seat 530 is also provided with a first pin 551, a second pin 552, a third pin 553 and a fourth pin 554; the first pin 551 is a ground pin for grounding the laser chip 544 and the backlight detector 546; the second pin 552 is a positive signal pin of the laser chip and is used for transmitting a high-frequency signal; the third pin 553 is a negative signal pin of the laser chip and is also a negative signal pin of the backlight detector, and is used for transmitting a high-frequency signal and realizing differential signal transmission; the fourth pin 554 is a positive signal pin of the backlight detector, and is used for transmitting a high-frequency signal. Further, the positive electrode of the laser chip 544 is electrically connected to the second pin 552 through a gold wire, and the negative electrode is electrically connected to the third pin 553 through a gold wire; the positive electrode of the backlight detector 546 is electrically connected to the fourth pin 554 by a gold wire, and the negative electrode is electrically connected to the third pin 553 by a gold wire. In order to shorten the wire bonding length between the anode of the laser chip 544 and the second pin 552, and between the anode of the backlight detector 546 and the fourth pin 554, the first metal block 5521 and the second metal block 5541 are respectively disposed on the surfaces of the second pin 552 and the fourth pin 554, so as to shorten the wire bonding length and increase the high-frequency performance of the signal.

As shown in fig. 26 and 27, the surface of the socket 530 is provided with a first pin through hole 531, a second pin through hole 532, and a third pin through hole 533; taking the third pin through hole 533 as an example, the third pin through hole 533 is used for disposing the third pin 553; the third pin-through hole 533 is continuously disposed with the inclined supporting surface 534, specifically, one end of the third pin-through hole 533 is continuously disposed with the inclined supporting surface 534, and the other end is inclined toward the top surface of the socket 530, so that the third pin-through hole 533 is inclined toward two opposite directions, and the third pin-through hole 533 is finally disposed in a heart shape.

In the embodiment of the present application, a first lens 543 is disposed inside the light emitting device 500, and a second lens 890 is disposed between each optical element in the circular tube 400 and the optical fiber adapter 900; the first lens 543 and the second lens 890 form a dual-lens system of the optical transceiver; the optical coupling efficiency can be improved through the double-lens system, the light emitting efficiency is further improved, and the OTDR light emission performance is further improved. The light window 541 and the backlight detector 546 in the light emitting device 500 are disposed in an inclined manner, so that light beams incident into the light window 541 and the backlight detector 546 can be prevented from returning to the laser chip 544 along the original path, and the OTDR light emitting performance can be improved.

Fig. 31, 32, and 33 show the structure of the round and square tube 400, wherein a first pipe orifice 410 is disposed on a first sidewall of the round and square tube 400, a second pipe orifice 420 is disposed on a second sidewall, a third pipe orifice 430 and a fourth pipe orifice 440 are disposed on a third sidewall, and a fifth pipe orifice 450 is disposed on a fourth sidewall.

Fig. 34 to 36 show the internal structure of the round and square tube 400; the round and square tube 400 is provided with a first cavity 401, an isolator accommodating cavity 402, a splitting piece accommodating cavity 403, a second filter accommodating cavity 404, a reflector accommodating cavity 405, a second lens accommodating cavity 406, a second cavity 407, a first filter accommodating cavity 408 and a third filter accommodating cavity 409. The first cavity 401 serves to isolate the light emitting device 500 from the optical isolator 810 to avoid each other; isolator housing 402 is used to house optical isolator 810; the spectroscopic piece accommodating chamber 403 is used for arranging the spectroscopic piece 820; the second filter accommodating cavity 404 is used for arranging a second filter 860; the reflective sheet accommodation cavity 405 is used to dispose a reflective sheet 870; the second lens receiving chamber 406 is for disposing a second lens 890; the second cavity 407 is used to provide an adjustable space for the fiber adapter 900 to couple; first filter receiving cavity 408 is used for arranging first filter 850; the third filter receiving cavity 409 is used for arranging a third filter 880.

The first cavity 401 and the isolator accommodating cavity 402 are arranged adjacently and are both arranged in the first pipe orifice 410, and the sinking degree of the first cavity 401 towards the periphery of the round and square pipe body 400 is greater than the sinking degree of the isolator accommodating cavity 402 towards the periphery of the round and square pipe body 400; the first cavity 401 is provided to prevent the coupling sleeve 510 of the light emitting device 500 from colliding with the optical isolator 810 during welding and interfering with each other, and the first cavity 401 allows the coupling sleeve 510 and the optical isolator 810 to escape from each other.

The spectroscopic sheet accommodating chamber 403 is used for arranging the spectroscopic sheet 820, as shown in fig. 34, a second light hole 403a is formed in one side wall of the spectroscopic sheet accommodating chamber 403, and a third light hole 403b is formed in the other side wall; the light splitting piece accommodating cavity 403, the second light transmission hole 403a and the third light transmission hole 403b are communicated; the OTDR emission light from the light emitting device 500 is incident on the surface of the light splitter 820 along the second light hole 403a, and the second split light of the OTDR emission light is incident on the light absorption plate 830 along the third light hole 403b; when the OTDR reflected light is transmitted to the splitter 820, the first split of the OTDR reflected light enters the light isolator 810 along the second light hole 403a, and the other part of the first split of the OTDR reflected light is reflected by the splitter 820 to enter the first filter 850, and then enters the first optical receiver 600.

The second lens accommodating cavity 406 and the second cavity 407 are adjacently arranged, and the recessed degree of the second cavity 407 towards the periphery of the round and square tube 400 is greater than the recessed degree of the second cavity 407 towards the periphery of the round and square tube 400; the second cavity 407 is used to provide an adjustable space for the fiber adapter 900 to couple; specifically, when the fiber adapter 900 is coupled along the Z axis, a small portion of the end of the fiber stub 920 enters the round-square tube 400, and therefore, the second cavity 407 is disposed at the end of the round-square tube 400, and the second cavity 407 provides a space for the fiber stub 920 to move and move when the fiber adapter 900 is coupled along the Z axis.

Based on the structure of the round and square tube 400, the structure in which each optical element is provided in the round and square tube 400 is shown in fig. 28 to 30. Fig. 28 shows the structure of the optical isolator 810 and the second lens 890. As shown in fig. 29 and 30, the optical isolator 810, the spectroscope 820, the light absorption plate 830, the first filter 850, and the baffle 840 constitute a first wavelength spectroscopic system, and the second filter 860, the reflector 870, and the third filter 880 constitute a second wavelength spectroscopic system.

Fig. 37-42 show the assembled relationship between the spectroscopic receiving chamber 403 and the spectroscopic plate 820; as shown in fig. 37 and 38, the spectroscope 820 is provided in the spectroscope accommodation chamber 403; a second light hole 403a is formed in one side wall of the light splitting piece accommodating cavity 403, and a third light hole 403b is formed in the other side wall; the light splitting piece accommodating cavity 403, the second light transmission hole 403a and the third light transmission hole 403b are communicated; the OTDR emission light from the light emitting device 500 is incident on the surface of the light splitter 820 along the second light hole 403a, and the second split light of the OTDR emission light is incident on the light absorption plate 830 along the third light hole 403b; when the OTDR reflected light is transmitted to the splitter 820, a part of the OTDR reflected light is transmitted along the splitter 820, that is, the first split light of the OTDR reflected light is incident on the light isolator 810 along the second light hole 403a, and another part of the first split light is reflected by the splitter 820 to enter the first filter 850, and then enters the first optical receiver 600. As shown in fig. 39, the first inclined surface 403c is formed in the circular tube 400, the first inclined surface 403c is formed by recessing the first inclined surface 403c from the bottom end of the inclined surface toward the second light-transmitting hole 403a, and the space obtained by the recessing is used for embedding the light splitter 820; the spectroscopic sheet receiving cavity 403 includes a supporting surface 4031, a supporting surface 4032 and a contact surface 4033; one side wall of the first inclined surface 403c is a support surface 4031, one side wall is a support surface 4032, and the other side wall is a contact surface 4033; the first inclined surface 403c, the abutting surface 4031, the supporting surface 4032 and the abutting surface 4033 are configured as shown in fig. 42; every two of the supporting surface 4031, the supporting surface 4032 and the sticking surface 4033 are perpendicular to each other, and the supporting surface 4031, the supporting surface 4032 and the sticking surface 4033 form a body of the spectroscopic piece accommodating cavity 403; the supporting surface 4031 and the supporting surface 4032 form a right-angle clamping groove, namely a first right-angle clamping groove, the supporting surface 4032 and the sticking surface 4033 form another right-angle clamping groove, namely a second right-angle clamping groove, two adjacent side walls of the light splitting sheet 820 are embedded into the first right-angle clamping groove, the other adjacent side walls of the light splitting sheet 820 are embedded into the second right-angle clamping groove, and the side walls of the light splitting sheet 820 facing to the second light transmitting hole 403a and the third light transmitting hole 403b are connected with the sticking surface 4033 in a sticking manner; one side wall of the beam splitter is connected with the support surface 4031 in a supporting manner, one side wall of the beam splitter is connected with the support surface 4032 in a supporting manner, and the other side wall of the beam splitter is connected with the support surface 4033 in a supporting manner, so that the beam splitter 820 is realized; the spectroscopic plate 820 and the first inclined plane 403c are in parallel, and the first inclined plane 403c is disposed at a predetermined inclination angle to match the inclination angle of the spectroscopic plate 820, in some embodiments of the present application, the inclination angle of the spectroscopic plate 820 is 45 °. Further, the corresponding wall surfaces of the light splitting sheet 820 are respectively connected with the abutting surface 4031, the supporting surface 4032 and the adhering surface 4033 through glue pasting, glue overflows to affect a light path during pasting, and the light splitting sheet 820 can be warped or pasted infirm, so that the middle position of the supporting surface 4032 is sunken to obtain a glue overflowing groove 4034, the glue overflowing during pasting can overflow into the glue overflowing groove 4034, adverse effects caused by the overflowing glue are avoided, the glue overflowing groove 4034 can provide an operation space for pasting after the light splitting sheet 820 is picked up by tweezers, and the pasting operation is facilitated.

Fig. 43-52 illustrate the assembly relationship between the absorbing sheet 830, the absorbing sheet holder 830a and the circular and square tubular body 400; the light absorbing sheet support 830a is used for bearing the light absorbing sheet 830; in some embodiments of the present application, the light absorbing sheet 830 and the light absorbing sheet holder 830a are connected to form an integral body, and the integral body is connected to the circular and square tube 400; the round and square tube 400 is provided with a fourth tube opening 440, and the fourth tube opening 440 is used for embedding a light absorption sheet bracket 830a; the light absorbing sheet holder 830a is hat-shaped, the light absorbing sheet holder 830a includes a cover plate 830a4 and a column 830a5, the cover plate 830a4 covers the surface of the column 830a5, and the cover plate 830a4 protrudes from the column 830a5; the column 830a5 is a column with two asymmetric ends, and the length of one end is shorter than that of the other end; the column 830a5 is provided with a mounting surface 830a1, the mounting surface 830a1 is formed by recessing one end of the column 830a5, which is relatively long, toward the cover plate 830a4 at an inclination angle, the mounting surface 830a1 has an inclination angle with respect to the cover plate 830a4, and the mounting surface 830a1 is used for arranging the light absorbing sheet 830; as mentioned above, when the OTDR emission light passes through the optical isolator 810 and then passes through the spectroscope 820, since the spectroscope 820 is semi-transparent and semi-reflective, part of the OTDR emission light is transmitted through the spectroscope 820, and part of the OTDR emission light is reflected by the spectroscope 820, and the OTDR emission light reflected by the spectroscope 820 is called crosstalk light; since the crosstalk light is diffusely reflected in the circular and square tube 400 and enters the first light receiving device 600 to cause crosstalk to the OTDR, the light absorbing sheet 830 is disposed on the optical path of the second light split emitted by the OTDR, and the light absorbing sheet 830 can absorb the crosstalk light to prevent the crosstalk light from entering the first light receiving device 600 to cause interference to the OTDR. In this embodiment, the light absorbing sheet 830 is used for absorbing crosstalk light, but the light absorbing sheet 830 cannot absorb all crosstalk light, the light absorbing sheet 830 has a certain mirror reflection, and may reflect a part of unabsorbed crosstalk light, so the mounting surface 830a1 is obliquely disposed, and the light absorbing sheet 830 is obliquely disposed, when the light absorbing sheet 830 is obliquely disposed, the unabsorbed crosstalk light may be prevented from being reflected to the light splitting sheet 820 along the original path, and further from being reflected by the light splitting sheet 820 and returned to the light emitting device 500, so the light absorbing sheet 830 is obliquely disposed, and the unabsorbed crosstalk light may be diffused along other transmission directions, and the unabsorbed crosstalk light is prevented from being returned to the light emitting device 500, thereby improving the light emitting performance. Further, the mounting surface 830a1 is a U-shaped mounting surface, the center of the mounting surface 830a1 is hollow, the two ends are solid surfaces, the light absorbing sheet 830 is attached to the solid surfaces at the two ends of the mounting surface 830a1, when the light absorbing sheet 830 is attached, because the mounting surface 830a1 is hollow, the whole surface of the light absorbing sheet 830 is not contacted with the mounting surface 830a1, if the whole surface of the light absorbing sheet 830 is contacted with the mounting surface 830a1, the crosstalk light which is not absorbed by the light absorbing sheet 830 will be reflected along the mounting surface 830a1, so the mounting surface 830a1 with a hollow design can reduce the reflection amount of the crosstalk light; further, the hollow structure of the mounting surface 830a1 is a third cavity 830a2, and the structure of the third cavity 830a2 can be clearly seen in fig. 48; a first groove 830a3 is provided at the end of the solid surface of the mounting surface 830a 1; when the light absorbing sheet 830 is adhered to the installation surface 830a1 by glue, the glue overflows under the action of gravity, and the overflowing glue can cause the light absorbing sheet 830 to warp or be adhered insecurely, so that the first groove 830a3 is arranged to collect the overflowing glue in the application, and adverse effects on the light absorbing sheet 830 are avoided; the existence of the first groove 830a3 can also avoid the structure residue on processing, and ensure the mounting precision of the light absorbing sheet 830; the light absorbing sheet 830 has a certain transmittance, so that a part of stray light can be transmitted, and the third cavity 830a2 can provide a diffuse reflection space for the transmitted crosstalk light, so that the transmitted crosstalk light is diffusely reflected in the third cavity 830a2, the energy of the crosstalk light is reduced, and the crosstalk light is prevented from being reflected again by the light absorbing sheet 830.

The structure of the light absorbing sheet 830 connected with the light absorbing sheet support 830a is shown in fig. 45-47, and as shown in fig. 45-47, one end of the light absorbing sheet 830 is disposed at the first groove 830a3, the arrangement of the first groove 830a3 can avoid the structure residue in processing, and the light absorbing sheet 830 and the light absorbing sheet support 830a can be retracted from each other, so as to ensure the mounting accuracy of the light absorbing sheet 830. Fig. 49 and 50 show that the light absorbing sheet 830 is connected with the light absorbing sheet holder 830a as an integral structure and is connected with the round and square tube 400, specifically, the round and square tube 400 is provided with a fourth tube opening 440, and the light absorbing sheet holder 830a carries the light absorbing sheet 830 to be embedded into the fourth tube opening 440; further, as shown in fig. 51 and 52, the fourth nozzle 440 includes a cylinder receiving cavity 441 and a cover receiving cavity 442, the shape of the cylinder receiving cavity 441 is adapted to the cylinder 830a5 for disposing the cylinder 830a5; the cover plate receiving cavity 442 is shaped to accommodate the cover plate 830a4 for positioning the cover plate 830a4. The column accommodating cavity 441 and the cover plate accommodating cavity 442 are arranged in a stepped manner, the inner diameter of the column accommodating cavity 441 is larger than that of the cover plate accommodating cavity 442, and the height of the column accommodating cavity 441 is larger than that of the cover plate accommodating cavity 442; the cover plate 830a4 and the column 830a5 of the light absorbing sheet bracket 830a are respectively embedded into the cover plate accommodating cavity 442 and the column accommodating cavity 441; further, the cylinder accommodating cavity 441 is communicated with the third light-transmitting hole 403b, so that the second split light of the OTDR emitted light is transmitted into the cylinder accommodating cavity 441 along the third light-transmitting hole 403, and then transmitted into the light-absorbing sheet 830, the light-absorbing sheet 830 can absorb most of the second split light of the OTDR emitted light, and can also reflect and transmit a small portion of light (respectively called as reflected light and transmitted light), by obliquely arranging the light-absorbing sheet 830, the reflected light is diffused along other transmission directions, and the reflected light is prevented from returning into the light-splitting sheet 820; the third cavity 830a2 provides a diffuse reflection space for the transmitted light, so that the transmitted crosstalk light is diffusely reflected in the third cavity 830a2, the energy of the crosstalk light is attenuated, and the crosstalk light is prevented from being reflected again by the light absorbing sheet 830.

Fig. 53 to 59 show the assembly relationship of the first filter 850, the baffle 840 and the round and square tube 400, and as shown in fig. 53 to 59, the first filter 850 is disposed at the bottom end of the baffle 840 and is disposed in the second nozzle 420 of the round and square tube 400. The first filter 850 and the baffle 840 are embedded in the second nozzle 420, and the first light receiving device 600 is also embedded in the second nozzle 420. The baffle 840 includes a first light-transmitting hole 841 and a mounting groove 842, and the structure of the first light-transmitting hole 841 and the mounting groove 842 can be clearly seen in fig. 57; the first light-transmitting holes 841 and the mounting grooves 842 are concentrically arranged, in some embodiments of the present application, the first light-transmitting holes 841 are formed by downwardly recessing the upper surface of the baffle 840 to penetrate through the baffle 840, and the first light-transmitting holes 841 are through holes; a mounting groove 842 is formed by upwards recessing the lower surface of the baffle 840 to a position half the height of the baffle 840; the aperture of the first light-transmitting hole 841 is relatively smaller than that of the mounting groove 842, and the mounting groove 842 extends relatively to the first light-transmitting hole 841, so that the mounting groove 842 has an upper surface, a part of which is located at one end of the first light-transmitting hole 841, and the other part of which is located at the other end of the first light-transmitting hole 841, and thus, two ends of the first filter 850 can be respectively located at the upper surface of the mounting groove 842; the state that first filter 850, baffle 840 present after connecting is: the first filter 850 can be seen through the first light hole 841, light can reach the surface of the first filter 850 through the first light hole 841, and the first filter 850 can be embedded in the mounting groove 842 to realize that the baffle 840 bears the first filter 850; therefore, in the embodiment of the present application, the baffle 840 may block or intercept crosstalk light and stray light from entering the first light receiving device 600, and may also carry the first filter 850; as described above, the OTDR reflected light sequentially passes through the fiber adapter 900, the second lens 890 and the second filter 860, and reaches the splitter 820, changes the transmission direction under the reflection of the splitter 820, and enters the first filter 850 through the first light hole 841 on the baffle 840, and then enters the first light receiving device 600; for this purpose, the baffle 840 and the first filter 850 are disposed on the reflected light path of the optical splitter 820 for OTDR reflected light; the light (i.e., crosstalk light) reflected by the light splitter 820 is mostly absorbed by the light absorber 830, and a part of the crosstalk light is still diffusely reflected in the circular and square tube 400, and the baffle 840 is disposed to prevent the part of the crosstalk light from entering the first light receiving device 600; meanwhile, the baffle 840 is provided with a mounting groove 842 to mount the first filter 850; as shown in fig. 55, the second nozzle 420 of the circular tube 400 includes a curved surface 421, a first attaching surface 422, and a second attaching surface 423; the shape of baffle 840 suits with the shape of curved surface 421, baffle 840 inlays and locates in the circumference that curved surface 421 encloses the city, in order to further increase the stability of baffle 840, paste the connection with first subsides dress surface 422 and second subsides dress surface 423 respectively with the relative both ends of baffle 840 upper surface, paint glue on the relative both ends surface of baffle 840 upper surface, then paste the connection with first subsides dress surface 422 and second subsides dress surface 423 respectively, in order to increase the stability that baffle 840 set up. The baffle 840 carries the first filter 850 and is embedded in the second tube opening 420, and the OTDR reflected light enters the first filter 850 through the first light hole 841, and then enters the first optical receiver 600, so as to realize OTDR monitoring.

The second wavelength splitting system includes a second filter 860, a reflective plate 870, and a third filter 880.

Fig. 60-63 illustrate the second filter 860 in assembled relation to the circular tube 400; the round and square tube 400 has a second filter accommodating cavity 404, and the second filter accommodating cavity 404 is used for arranging a second filter 860; second filter accommodating cavity 404 includes second inclined surface 4041, third inclined surface 4042 is provided at the bottom end of second inclined surface 4041, one surface of second filter 860 is connected to second inclined surface 4041, and the other surface is connected to third inclined surface 4042, and second filter 860 is disposed in second filter accommodating cavity 404, fig. 63 shows a side view in which second filter 860 is disposed in second filter accommodating cavity 404; second groove 4044 is provided between second inclined surface 4041 and third inclined surface 4042, if second inclined surface 4041 is directly connected to third inclined surface 4042, a metal burr phenomenon may occur during processing, and mounting accuracy of second filter piece 860 is reduced, so presence of second groove 4044 can prevent metal burr from existing between second inclined surface 4041 and third inclined surface 4042 to affect mounting accuracy of second filter piece 860, and presence of second groove 4044 can ensure mounting accuracy of second filter piece 860; the second inclined surface 4041 is a U-shaped inclined surface, and a hollow fourth light transmitting hole 4043 is provided, where the fourth light transmitting hole 4043 is used to transmit OTDR emitted light when reaching the second filter 860 and continue to transmit along the optical path of the OTDR emitted light, and is also used to transmit OSC data light when reaching the second filter 860 and continue to transmit along the optical path of the OSC data light. Further, in the embodiment of the present application, under the combination of the 11 ° second filter 860 and the 34 ° reflective plate 870, the transmission direction of the OSC data light is adjusted from horizontally transmitting along the optical axis of the fiber adapter 900 to transmitting along the direction perpendicular to the third filter 880; in order to adapt to the optical path of the second filter 860, in the embodiment of the present application, the second inclined surface 4041 has a predetermined inclination angle with respect to the horizontal axis of the circular tube 400, so as to realize the inclined arrangement of the second filter 860, and further, in combination with the 34 ° reflector 870, the transmission direction of the OSC data light is adjusted to be transmitted along the direction perpendicular to the third filter 880 by being horizontally transmitted along the optical axis direction of the optical fiber adapter 900.

Fig. 64 to 65 show the fitting relationship of the reflection sheet 870 to the circular-square tube body 400; the round and square tube 400 has a reflector accommodating cavity 405, and the reflector accommodating cavity 405 is used for arranging a reflector 870; the reflector accommodating cavity 405 includes a fourth inclined surface 4051, the fourth inclined surface 4051 is U-shaped, a hollow fourth cavity 4053 is provided, the reflector 870 has a small transmittance, and the fourth cavity 4053 can provide a diffuse reflection space for the transmitted light, so as to prevent the transmitted light from being emitted out through the reflector 870; the reflector receiving cavity 405 further includes a fifth inclined surface 4052, one surface of the reflector 870 is connected to the fourth inclined surface 4051, and the other surface is connected to the fifth inclined surface 4052, so as to dispose the reflector 870 in the reflector receiving cavity 405; a third groove 4054 is formed between the fourth inclined surface 4051 and the fifth inclined surface 4052, and if the fourth inclined surface 4051 and the fifth inclined surface 4052 are directly connected, metal burrs may occur during processing, which reduces the mounting accuracy of the reflector 870, so that the presence of the third groove 4054 can prevent the metal burrs from being formed between the fourth inclined surface 4051 and the fifth inclined surface 4052 to affect the mounting accuracy of the reflector 870, and the presence of the third groove 4054 can ensure the mounting accuracy of the reflector 870; further, in the embodiment of the present application, under the combination of the 11 ° second filter 860 and the 34 ° reflective plate 870, the transmission direction of the OSC data light is adjusted from horizontally transmitting along the optical axis of the fiber adapter 900 to transmitting along the direction perpendicular to the third filter 880; in order to adapt to the optical path of the reflective sheet 870, in the embodiment of the present application, the fourth inclined surface 4051 has a predetermined inclination angle with respect to the horizontal axis of the circular tube 400, so as to realize the inclined arrangement of the reflective sheet 870, and further, in combination with the 11 ° second filter 860, the transmission direction of the OSC data light is adjusted to be transmitted in the direction perpendicular to the third filter 880 from the horizontal transmission along the optical axis direction of the optical fiber adapter 900. In order to adapt to the optical path of the reflection sheet 870, in the embodiment of the present application, the fourth inclined surface 4051 has a predetermined inclination angle with respect to the horizontal axis of the circular tube 400, so as to realize the inclined arrangement of the reflection sheet 870, and further, in combination with the 11 ° second filter 860, the transmission direction of the OSC data light is adjusted from being horizontally transmitted along the optical axis direction of the fiber adapter 900 to being transmitted along the direction perpendicular to the third filter 880.

Further, the reflector accommodating cavity 405 further includes a connecting surface 4055, the connecting surface 4055 is connected to the fifth inclined surface 4052, the connecting surface 4055, the fifth inclined surface 4052, and the third groove 4054 are sequentially connected, and a U-shaped structure, that is, a hollow design, is formed after the connection; the connecting surface 4055 can provide a certain support and transition for the installation angle of the reflector 870, and further increase the installation accuracy of the reflector 870.

Fig. 66-67 show the assembled relationship of the third filter 880 and the circular-square tube 400; the round and square tube body 400 is provided with a third tube opening 430, the end face of the third tube opening 430 is provided with a third filter accommodating cavity 409, and the third filter accommodating cavity 409 is used for arranging a third filter 880; the third filter receiving cavity 409 comprises a first platform 4091 and a second platform 4092; the first platform 4091 and the second platform 4092 are oppositely arranged; the third filter 880 is bridged on the first platform 4091 and the second platform 4092, one end of the third filter 880 is connected with the first platform 4091, and the other end of the third filter 880 is connected with the second platform 4092; the structure of the third filter 880 arranged behind the third filter receiving cavity 409 is shown in fig. 67. The second light receiving device 700 is embedded in the third pipe orifice 430, and the third filter 880 allows OSC data light to enter the second light receiving device 700, and does not allow other wavelengths except the second wavelength to enter the second light receiving device 700, thereby realizing OSC data transmission.

The above description is only for the specific embodiments of the present disclosure, but the scope of the present disclosure is not limited thereto, and any person skilled in the art will appreciate that changes or substitutions within the technical scope of the present disclosure are included in the scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.

Claims

1. A light module, comprising:

a circuit board;

a round and square tube body;

the light emitting device is connected with the first pipe opening of the round and square pipe body and used for emitting OTDR (optical time domain reflectometer) emitted light into the round and square pipe body, and the OTDR emitted light is used for OTDR detection;

the second light receiving device is arranged in a third pipe orifice of the round and square pipe body and used for receiving OSC data light with the wavelength of a second wavelength from the outside of the optical module;

the optical component is arranged in the inner cavity of the round and square tube body and comprises an optical isolator, a light splitting piece, a light absorbing piece, a first filter, a reflector, a second filter and a third filter;

the round and square pipe body is respectively provided with the first pipe orifice, the second pipe orifice, the third pipe orifice, the fourth pipe orifice and the fifth pipe orifice on the side wall, and the interior of the round and square pipe body is respectively provided with:

the abutting surface is a side wall formed by the depression of the second inclined surface and is connected with the surface of the light splitting sheet,

the second mouth of pipe, interior periphery inlays and is equipped with the baffle, the baffle includes:

the second filter accommodating cavity is used for arranging the second filter;

the reflector plate accommodating cavity is used for accommodating the reflector plate; the third filter accommodating cavity is used for arranging the third filter;

the second lens accommodating cavity is arranged at the fifth pipe orifice;

the second cavity is arranged at the fifth pipe orifice and used for providing an adjustable space for the coupling of the optical fiber adapter;

the light absorption sheet support accommodating cavity comprises a column accommodating cavity and a cover plate accommodating cavity which are arranged in a step manner;

2. The light module of claim 1,

the second filter plate accommodating cavity comprises a second inclined plane and a third inclined plane;

the second inclined plane is connected with one surface of the second filter, is a U-shaped inclined plane, and is provided with a hollow fourth light transmitting hole, and the fourth light transmitting hole is used for allowing OTDR emitted light to pass through when reaching the second filter 860;

the third inclined plane is connected with the other surface of the second filter plate and arranged at the end part of the second inclined plane;

the reflector plate accommodating cavity comprises a fourth inclined surface and a fifth inclined surface;

the fourth inclined surface is connected with one surface of the reflector plate, is a U-shaped inclined surface, is provided with a hollow fourth cavity, and is used for diffuse reflection of the OTDR emitted light through the reflected light of the spectroscope;

the fifth inclined surface is connected with the other surface of the reflector plate;

and the third filter accommodating cavity comprises a first platform and a second platform which are oppositely arranged, and the third filter is bridged on the first platform and the second platform.

3. The optical module according to claim 1, wherein a laser chip and a first lens are provided in the light emitting device;

the first lens is used for converting OTDR emitted light generated by the laser chip from divergent light to parallel light;

the optical isolator is arranged in the first pipe orifice and used for preventing reflected light of OTDR emitted light and transmitted light of the OTDR reflected light after passing through the light splitting piece from returning to the light emitting device;

the optical splitter is arranged on a transmission light path of the OTDR emission light, and is used for transmitting and reflecting the OTDR emission light to respectively obtain a first optical splitter of the OTDR emission light and a second optical splitter of the OTDR emission light, and is also used for transmitting and reflecting the OTDR reflection light to respectively obtain a first optical splitter of the OTDR reflection light and a second optical splitter of the OTDR reflection light;

the light absorption sheet is arranged in the fourth pipe orifice through a light absorption sheet support and used for absorbing second split light emitted by the OTDR so as to prevent the second split light emitted by the OTDR from entering the first light receiving device;

the first filter is arranged on a transmission light path of reflected light of the OTDR reflected light after passing through the light splitting sheet and is used for enabling second split light of the OTDR reflected light to penetrate through so as to enter the first light receiving device;

a second filter, disposed on a transmission light path of the first split of the OTDR emission light, configured to transmit the first split of the OTDR emission light and the OTDR reflection light, and reflect the OSC data light;

the reflector plate is arranged on a transmission light path of reflected light of the OSC data light passing through the second filter plate, and is used for receiving the OSC data light reflected by the second filter plate and reflecting the OSC data light;

the third filter is arranged on a transmission light path of reflected light of the OSC data light after passing through the reflector plate, and is used for receiving the OSC data light reflected by the reflector plate and transmitting the OSC data light to the second light receiving device;

the second lens is arranged at a fifth pipe orifice and used for converting the OTDR emitted light from parallel light into convergent light and transmitting the converged OTDR emitted light into the optical fiber adapter; and the optical fiber is also used for converting the OTDR reflected light and the OSC data light from divergent light into parallel light so as to enter the round tube body.

4. The optical module of claim 2, wherein the post has a mounting surface;

the mounting surface is formed by recessing one relatively long end of the column towards the cover plate at an inclined angle;

the mounting surface is provided with an inclination angle relative to the cover plate so as to enable the light absorbing sheet to be arranged in an inclined mode.

5. The optical module of claim 4, wherein the end of the surface of the mounting surface is provided with a first groove for collecting glue overflowing during mounting;

a second groove is formed between the second inclined surface and the third inclined surface;

a third groove is formed between the fourth inclined surface and the fifth inclined surface.

6. The optical module according to claim 1, wherein the edge of the baffle plate is connected to the second port by a sealant, so as to block the OTDR emitted light from the second split light into the first light receiving device;

the baffle has an absorption layer on its surface to absorb the second component of the OTDR emitted light that is not absorbed by the absorption sheet.

7. The optical module of claim 1, wherein the post receiving cavity inner diameter is larger relative to the cover receiving cavity inner diameter, and the post receiving cavity height is larger relative to the cover receiving cavity height.

8. The light module of claim 5, wherein the reflector sheet receiving cavity further comprises:

and the connecting surface is connected with the fifth inclined surface, and the connecting surface, the fifth inclined surface and the third groove are sequentially connected to form a U-shaped structure.

9. The optical module of claim 3, wherein the first lens is a collimating lens and the second lens is a converging lens.

10. The optical module of claim 1, wherein there is no optical element between the second lens and the fiber optic adapter.