CN114859472B - Multifunctional integrated optical device - Google Patents
Multifunctional integrated optical device Download PDFInfo
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- CN114859472B CN114859472B CN202210575036.7A CN202210575036A CN114859472B CN 114859472 B CN114859472 B CN 114859472B CN 202210575036 A CN202210575036 A CN 202210575036A CN 114859472 B CN114859472 B CN 114859472B
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- beam splitter
- light
- optical fiber
- fiber collimator
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/27—Optical coupling means with polarisation selective and adjusting means
- G02B6/2746—Optical coupling means with polarisation selective and adjusting means comprising non-reciprocal devices, e.g. isolators, FRM, circulators, quasi-isolators
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/27—Optical coupling means with polarisation selective and adjusting means
- G02B6/2753—Optical coupling means with polarisation selective and adjusting means characterised by their function or use, i.e. of the complete device
- G02B6/2773—Polarisation splitting or combining
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/32—Optical coupling means having lens focusing means positioned between opposed fibre ends
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- Optics & Photonics (AREA)
Abstract
The invention discloses a multifunctional integrated optical device, which comprises a first optical fiber collimator, a first beam splitter, a first optical rotation sheet, a second beam splitter, a magneto-optical crystal, an optical rotation sheet combination, a third beam splitter, a WDM (wavelength division multiplexing) beam splitter and a second optical fiber collimator along the light propagation direction; the first beam splitter and the third beam splitter respectively comprise two polarization films which are parallel to each other, and the first optical rotation sheet is arranged at one polarization film light outlet of the first beam splitter; the optical rotation sheet combination comprises a second optical rotation sheet and a third optical rotation sheet which are arranged in parallel; the included angle between the WDM light splitting piece and the incident light is less than 90 degrees; the integrated optical device further comprises a third optical fiber collimator and an optical filter which are arranged on the same axis, and the third optical fiber collimator, the optical filter and the second collimator are arranged on the same side of the WDM light splitting sheet. The embodiment of the invention integrates the optical isolator and the WDM device into a whole, has small volume, low cost and high reliability, and can be widely applied to the field of optical devices.
Description
Technical Field
The invention relates to the field of optical devices, in particular to a multifunctional integrated optical device.
Background
The high-power laser system is very sensitive to abnormally entering light, and if the light returning to the high-power laser system is strong, the stable operation of the high-power laser system is affected, and the whole laser system is damaged more seriously, so a light isolator is added in the laser system, so that the light can only pass in the forward direction, and the backward returning light is filtered. WDM (Wavelength Division Multiplexing) is a technology that uses multiple lasers to send multiple beams of laser light with different wavelengths simultaneously on a single optical fiber, each signal is transmitted in its unique color band after being modulated by data, and WDM can increase the capacity of the existing optical fiber infrastructure greatly. However, the existing optical device uses independent WDM and isolator, which has the problems of large volume, many fusion points, low reliability and high cost.
Disclosure of Invention
In view of the above, an object of the embodiments of the present invention is to provide a multifunctional integrated optical device, which integrates an optical isolator and a WDM device into a whole, and has a small size, low cost and high reliability.
In a first aspect, an embodiment of the present invention provides a multifunctional integrated optical device, where the integrated optical device includes, along a light propagation direction, a first optical fiber collimator, a first beam splitter, a first optical rotation plate, a second beam splitter, a magneto-optical crystal, an optical rotation plate combination, a third beam splitter, a WDM beam splitter, and a second optical fiber collimator; the first beam splitter and the third beam splitter respectively comprise two polarizing films which are parallel to each other, and the first optical rotation sheet is arranged at one of polarizing film light outlets of the first beam splitter; the optical rotation sheet combination comprises a second optical rotation sheet and a third optical rotation sheet which are arranged in parallel; the included angle between the WDM light splitting piece and the incident light is less than 90 degrees; the integrated optical device further comprises a third optical fiber collimator and an optical filter which are arranged on the same axis, the third optical fiber collimator, the optical filter and the second collimator are arranged on the same side of the WDM light splitting piece, and the optical filter is arranged between the third optical fiber collimator and the WDM light splitting piece.
Optionally, the integrated optical device further includes a photodetector and a photodetection system, the photodetector is disposed in a light exit direction of the second beam splitter, and the photodetector is in communication connection with the photodetection system.
Optionally, one or more of the first optical fiber collimator, the second optical fiber collimator, or the third optical fiber collimator includes a single optical fiber, a lens, a first glass sleeve, and a second glass sleeve, the single optical fiber passes through the second glass sleeve and then is connected to the lens, and the second glass sleeve and the lens are disposed inside the first glass sleeve.
Optionally, the single optical fiber and the lens are connected by means of hot melting.
Optionally, the first beam splitter, the second beam splitter, or the third beam splitter comprises a PBS beam splitter.
Optionally, the first optical rotation plate is a 45-degree optical rotation plate, and the second optical rotation plate and the third optical rotation plate are both 22.5-degree optical rotation plates.
Optionally, two sides of the WDM spectral slice are respectively plated with an antireflection film of the first signal light and a high reflection film of the second signal light, and the third optical fiber collimator, the optical filter, and the second collimator are disposed on the high reflection film side of the WDM spectral slice.
Optionally, the integrated optical device further includes magnets disposed on two sides of the magneto-optical crystal.
The implementation of the embodiment of the invention has the following beneficial effects: in the embodiment, signal light is emitted into an integrated optical device through a first optical fiber collimator, the signal light is divided into two paths of signal light through a first beam splitter after being emitted, wherein one path of signal light sequentially passes through a first optical rotation sheet, a second beam splitter, a magneto-optical crystal, a second optical rotation sheet and a third beam splitter, the other path of signal light sequentially passes through the second beam splitter, the magneto-optical crystal, a third optical rotation sheet and a third beam splitter, and the two paths of signal light are combined by the third beam splitter and then input into a second optical fiber collimator through a WDM (wavelength division multiplexing) beam splitter; the modulated light is input into a second optical fiber collimator through a third optical fiber collimator, an optical filter and a WDM light splitting sheet, and the signal light and the modulated light are coupled and output in the second optical fiber collimator, so that wavelength division multiplexing is realized; when the return light is emitted into the integrated optical device from the second optical fiber collimator, one part of the return light is reflected to the optical filter and filtered, and the other part of the return light is perpendicular to the signal light after passing through the third beam splitter, the optical rotation sheet combination, the magneto-optical crystal and the second beam splitter, and cannot reach the first optical fiber collimator through the second beam splitter, so that the reverse isolation effect is realized. The multifunctional integrated optical device integrates the optical isolator and the WDM device, and has small volume, low cost and high reliability.
Drawings
Fig. 1 is a schematic structural diagram of a multifunctional integrated optical device according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of another multifunctional integrated optical device provided in an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a fiber collimator according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of another multifunctional integrated optical device provided in the embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the figures and the specific embodiments. The step numbers in the following embodiments are provided only for convenience of illustration, the order between the steps is not limited at all, and the execution order of each step in the embodiments can be adapted according to the understanding of those skilled in the art.
As shown in fig. 1, an embodiment of the present invention provides a multifunctional integrated optical device, which includes, along a light propagation direction, a first optical fiber collimator 10, a first beam splitter 101, a first optical rotation plate 102, a second beam splitter 103, a magneto-optical crystal 104, an optical rotation plate combination, a third beam splitter 106, a WDM beam splitter 107, and a second optical fiber collimator 11; the first beam splitter 101 and the third beam splitter 106 each include two polarization films parallel to each other, and the first optical rotation sheet 102 is disposed at one of the polarization film light outlets of the first beam splitter 101; the optical rotation plate combination comprises a second optical rotation plate 105 and a third optical rotation plate 109 which are arranged in parallel; the included angle between the WDM light splitting sheet 107 and incident light is less than 90 degrees; the integrated optical device further includes a third optical fiber collimator 12 and an optical filter 108 disposed on the same axis, the third optical fiber collimator 12, the optical filter 108 and the second collimator 11 are disposed on the same side of the WDM splitting sheet 107, and the optical filter 108 is disposed between the third optical fiber collimator 12 and the WDM splitting sheet 107.
It should be noted that the parameters of the first beam splitter 101 and the third beam splitter 106 are the same.
The first optical rotation plate, the second optical rotation plate, and the first optical rotation plate may be quartz optical rotation plates.
The optical filter has a unidirectional transmittance of optical signals.
Referring to fig. 2, the integrated optical device further includes a photodetector 113 and a photodetector system 114, the photodetector 113 is disposed in the light exit direction of the second beam splitter 103, and the photodetector 113 is communicatively connected to the photodetector system 114.
It should be noted that the photodetector receives an input optical signal, converts the optical signal into an electrical signal, and transmits the electrical signal to the photodetector system, so as to detect the system. If the photoelectric detector monitors the intensity of the return light in real time and feeds the return light back to the monitoring system, the laser system is closed in time when the return light exceeds a return light threshold value preset by the monitoring system, and the normal work of the laser system is protected.
Referring to fig. 3, one or more of the first, second, or third optical collimators include a single optical fiber 8, a lens 13, a first glass sleeve 14, and a second glass sleeve 15, the single optical fiber 8 passes through the second glass sleeve 15 and then is connected to the lens 13, and the second glass sleeve 15 and the lens 13 are disposed inside the first glass sleeve 14.
Optionally, the single optical fiber and the lens are connected by means of hot melting.
The collimator is integrated with an optical fiber and a lens to perform a beam expanding function on light. The optical fiber end face is directly connected to the lens in a hot melting mode, so that the light energy density of the end face of the optical fiber head can be reduced, the laser damage threshold can be obviously improved, and the long-term reliability can be improved.
Optionally, the first beam splitter, the second beam splitter, or the third beam splitter comprises a PBS beam splitter.
It should be noted that the beam splitter may be determined according to practical applications, and the embodiment is not particularly limited.
Optionally, the first optical rotation plate is a 45-degree optical rotation plate, and the second optical rotation plate and the third optical rotation plate are both 22.5-degree optical rotation plates.
The first optical rotation plate rotates clockwise by 90 degrees, and the second optical rotation plate and the third optical rotation plate rotate counterclockwise by 45 degrees.
Optionally, two sides of the WDM spectral slice are respectively plated with an antireflection film of the first signal light and a high reflection film of the second signal light, and the third optical fiber collimator, the optical filter, and the second collimator are disposed on the high reflection film side of the WDM spectral slice.
Note that the first signal light and the second signal light are transmission lights of different wavelength bands.
Optionally, referring to fig. 1, the integrated optical device further includes magnets disposed on both sides of the magneto-optical crystal.
The operation of the multifunctional integrated optical device in this embodiment is as follows.
Referring to fig. 2, in one particular embodiment, the forward transmission process: when a signal light enters the first beam splitter 101 from the first optical fiber collimator 10, the signal light is split into a P light whose propagation direction is parallel to the incident light and an S light perpendicular to the incident light by the first polarizing film of the first beam splitter 101, and the S light is reflected by the second polarizing film of the first beam splitter 101, and the propagation direction is parallel to the incident light and the P light; after one of the S light passes through the quartz polariscope 102, the polarization direction is simultaneously rotated by 90 degrees clockwise to become P light, and then two beams of P light pass through the PBS beam splitter 103; due to the action of the polarizing film, S light can be reflected out, P light is transmitted and output, and the polarization direction is unchanged; after the two beams of P light pass through the magneto-optical crystal 104, the polarization direction simultaneously rotates by 45 degrees in the clockwise direction, and when one beam of P light passes through the quartz optical rotation sheet 105 and rotates by 45 degrees in the counterclockwise direction, the polarization direction is changed into P' light; the other beam of light is rotated by 45 degrees clockwise through the quartz optical rotation plate 109, so that the polarization direction is changed into S ' light, the propagation direction of the S ' light after being reflected by the first polarization film and the second polarization film of the third beam splitter 106 is still parallel to the P ' light, the polarization directions are mutually perpendicular, and the S ' light and the P ' light are combined into one beam of light to be emitted from the second beam splitter 106; finally, the signal light passes through the WDM beam splitter 107 and is coupled and output by the output fiber collimator 11 due to the action of the WDM beam splitter film. When the incident light enters the WDM light splitting sheet 107 from the optical fiber collimator 12, the visible light is reflected by the visible light high reflection film of the WDM light splitting sheet 107 at an included angle of about 45 degrees, and then is coupled and output by the output optical fiber collimator 11, so that the signal light and the visible light are output at the collimator 11 at the same time and play a role of wave combination.
Referring to fig. 4, in one embodiment, the reverse transmission process: when the backward light enters from the optical fiber collimator 11, the light is split into P light having a propagation direction parallel to the incident light and S light having a propagation direction perpendicular to the incident light by the first polarizing film of the third beam splitter 106; after the S light is reflected by the second polarization film of the third beam splitter 106, the propagation direction is parallel to the incident light and the P light, and when one of the P light passes through the 45-degree optical rotation sheet 105, the counterclockwise direction is rotated by 45 degrees, so the polarization direction is changed to 45 degrees; the other beam of S light passes through the 45-degree rotation plate 109 and rotates clockwise, so that the polarization direction changes to 45 degrees; after two 45-degree polarized lights pass through the magneto-optical crystal 104, the polarization direction is simultaneously rotated by 45 degrees in the counterclockwise direction to become S light, and after the two beams of S light are reflected by the polarization film of the PBS beam splitter 103, the propagation direction is perpendicular to the incident light, so that the two beams of S light cannot enter the input optical fiber collimator, and the effect of reverse optical isolation is achieved. Meanwhile, a photodetector 113 is disposed below the reversed S light for monitoring the intensity of the reversed S light and feeding back to the monitoring system 114. The monitoring system 114 performs a judgment according to the return light signal fed back by the photodetector 113, and when the return light exceeds a return light threshold preset by the monitoring system 114, the laser system is turned off, thereby protecting the normal operation of the laser system. In addition, the backward light is partially reflected to the direction of the optical filter 108 after passing through the WDM spectroscope 107, and the optical filter 108 reflects the backward light at a certain angle, thereby isolating the backward light returned by the output optical fiber collimator 11 and avoiding the backward light from burning the optical fiber collimator 12.
The implementation of the embodiment of the invention has the following beneficial effects: in the embodiment, signal light is emitted into an integrated optical device through a first optical fiber collimator, the signal light is divided into two paths of signal light through a first beam splitter after being emitted, wherein one path of signal light sequentially passes through a first optical rotation sheet, a second beam splitter, a magneto-optical crystal, a second optical rotation sheet and a third beam splitter, the other path of signal light sequentially passes through the second beam splitter, the magneto-optical crystal, a third optical rotation sheet and a third beam splitter, and the two paths of signal light are combined by the third beam splitter and then input into a second optical fiber collimator through a WDM (wavelength division multiplexing) beam splitter; the modulated light is input into a second optical fiber collimator through a third optical fiber collimator, an optical filter and a WDM light splitting sheet, and the signal light and the modulated light are coupled and output in the second optical fiber collimator, so that wavelength division multiplexing is realized; when the return light is emitted into the integrated optical device from the second optical fiber collimator, one part of the return light is reflected to the optical filter and filtered, and the other part of the return light is perpendicular to the signal light after passing through the third beam splitter, the optical rotation sheet combination, the magneto-optical crystal and the second beam splitter, and cannot reach the first optical fiber collimator through the second beam splitter, so that the reverse isolation effect is realized. The multifunctional integrated optical device integrates the optical isolator and the WDM device, and has small volume, low cost and high reliability.
While the preferred embodiments of the present invention have been illustrated and described, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (5)
1. A multifunctional integrated optical device is characterized by comprising a first optical fiber collimator, a first beam splitter, a first optical rotation sheet, a second beam splitter, a magneto-optical crystal, an optical rotation sheet combination, a third beam splitter, a WDM (wavelength division multiplexing) beam splitter and a second optical fiber collimator along the light propagation direction; the first beam splitter and the third beam splitter respectively comprise two polarizing films which are parallel to each other, and the first optical rotation sheet is arranged at one of polarizing film light outlets of the first beam splitter; the optical rotation sheet combination comprises a second optical rotation sheet and a third optical rotation sheet which are arranged in parallel; the included angle between the WDM light splitting sheet and the incident light is less than 90 degrees; the integrated optical device further comprises a third optical fiber collimator and an optical filter which are arranged on the same axis, the third optical fiber collimator, the optical filter and the second optical fiber collimator are arranged on the same side of the WDM light splitting piece, and the optical filter is arranged between the third optical fiber collimator and the WDM light splitting piece; the first optical rotation plate is a 45-degree optical rotation plate, and the second optical rotation plate and the third optical rotation plate are both 22.5-degree optical rotation plates; two sides of the WDM light splitting sheet are respectively plated with an antireflection film of first signal light and a high reflection film of second signal light, and the third optical fiber collimator, the optical filter and the second optical fiber collimator are arranged on the high reflection film side of the WDM light splitting sheet; the integrated optical device further comprises a photoelectric detector and a photoelectric detection system, the photoelectric detector is arranged in the direction of the light outlet of the second beam splitter, and the photoelectric detector is in communication connection with the photoelectric detection system.
2. The integrated optical device according to claim 1, wherein any one or more of the first, second, or third optical fiber collimators comprises a single optical fiber, a lens, a first glass sleeve, and a second glass sleeve, wherein the single optical fiber passes through the second glass sleeve and then is connected to the lens, and the second glass sleeve and the lens are disposed inside the first glass sleeve.
3. The integrated optical device as claimed in claim 2, wherein the single optical fiber is connected to the lens by thermal fusion.
4. The integrated optical device of claim 1, wherein the first, second, or third beam splitter comprises a PBS beam splitter.
5. The integrated optical device according to claim 1, further comprising magnets disposed on both sides of the magneto-optical crystal.
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| CN202210575036.7A CN114859472B (en) | 2022-05-25 | 2022-05-25 | Multifunctional integrated optical device |
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| CN202210575036.7A CN114859472B (en) | 2022-05-25 | 2022-05-25 | Multifunctional integrated optical device |
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| CN114859472A CN114859472A (en) | 2022-08-05 |
| CN114859472B true CN114859472B (en) | 2022-12-06 |
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| CN214669710U (en) * | 2021-04-16 | 2021-11-09 | 福建海创光电有限公司 | Optical isolator capable of monitoring return light |
| CN214954213U (en) * | 2021-07-06 | 2021-11-30 | 福建海创光电有限公司 | Integrated optical device of high-power optical isolator, WDM and beam combiner |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6922281B2 (en) * | 2002-05-03 | 2005-07-26 | Lightwaves 2020, Inc. | Erbium-doped fiber amplifier and integrated module components |
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2022
- 2022-05-25 CN CN202210575036.7A patent/CN114859472B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108700791A (en) * | 2015-09-07 | 2018-10-23 | 光联通讯技术有限公司美国分部 | Image intensifer |
| CN209028252U (en) * | 2018-11-27 | 2019-06-25 | 武汉光迅科技股份有限公司 | A kind of optical circulator |
| CN214201850U (en) * | 2020-12-04 | 2021-09-14 | 深圳市飞宇光纤系统有限公司 | Mini type low-loss LAN-WDM passive optical module |
| CN112362313A (en) * | 2021-01-11 | 2021-02-12 | 深圳市星汉激光科技股份有限公司 | Light path testing system and method for return light resistance of laser chip |
| CN214669710U (en) * | 2021-04-16 | 2021-11-09 | 福建海创光电有限公司 | Optical isolator capable of monitoring return light |
| CN214954213U (en) * | 2021-07-06 | 2021-11-30 | 福建海创光电有限公司 | Integrated optical device of high-power optical isolator, WDM and beam combiner |
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