JPH07294774A - Optical transmitter/receiver - Google Patents

Abstract

PURPOSE:To provide an optical transmitter/receiver which does not cause deterioration in characteristic against a temp. change. CONSTITUTION:As for the optical transmitter/receiver for storing a waveguide type optical component 2 constituted of a core 7 and a clad, one or both of a light emitting element and a light receiving element which are optically connected with the waveguide type optical component 2 in the same housing 1, the light emitting element, or the light receiving element is mounted on submounts 3 and 4, and the submounts 3 and 4 are connected with the waveguide type optical component 2 through an adapter 20, and also, the waveguide type optical component 2, the adapter 20 and either of the submounts 3 and 4 are fixed in the housing 1, and the other is not fixed in the housing 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical transmitter / receiver using a waveguide type optical component, and more particularly to an optical transmitter / receiver with less characteristic deterioration due to temperature change.

[0002]

2. Description of the Related Art FIG. 7 shows a conventional example of an optical transmitter / receiver using a waveguide type optical component. FIG. 8 is an enlarged sectional view of an optical coupling portion between the waveguide and the light emitting element shown in FIG. FIG. 9 is an enlarged sectional view of an optical coupling portion between the waveguide and the light receiving element shown in FIG. FIG. 10 is a sectional view of the waveguide shown in FIG.

In FIG. 7, a waveguide 2, a transmission side submount 3 and a reception side submount 4 are fixed on a housing 1 by soldering. The housing 1 and the lid 5 for sealing the housing 1 are made of Kovar. As shown in FIG. 10, the waveguide 2 is formed by forming a core 7 on a glass substrate 6 and covering the core 7 and the glass substrate 6 with a clad 8. The waveguide 2 constitutes an optical multiplexer / demultiplexer. As shown in FIG. 8, the semiconductor laser 9 is mounted on the transmitting side submount 3,
A photodiode 10 for transmitting power monitor and an aspherical lens 11 for condensing laser light are fixed. As shown in FIG. 9, a ball lens 12 is provided on the reception side submount 4,
The photodiode 13 and the preamplifier IC 14 are fixed. The components on both the submounts 3 and 4 for transmitting and receiving light are aligned so that they can be optically coupled to the waveguide 2. The housing 1 is provided with a lead pin 15, and input / output of a transmission signal and a reception signal is performed through the lead pin 15. The optical system coupling between the waveguide 2 and the optical fiber 16 is performed by fusion.

As described above, the compact multiplexer / demultiplexer 2 constituted by the waveguide 2, the light emitting element 9, the light receiving element 13 and the like are housed in the same housing 1, so that the optical transmitter / receiver can be downsized and the cost can be reduced. Can be realized.

[0005]

However, in the optical transmitter / receiver according to the prior art, since the housing 1 and the waveguide 2 have different expansion coefficients due to temperature, stress is generated on the surfaces bonded to each other and warpage occurs. However, since the angle and the positional relationship between the submounts 3, 4 on which the light emitting element 9 and the light receiving element 13 are mounted and the waveguide 2 change, the coupling of light deteriorates.
The optical transceiver using the waveguide 2 has a problem that its characteristics are easily deteriorated due to temperature change.

Therefore, an object of the present invention is to solve the above problems and provide an optical transmitter / receiver which does not deteriorate in characteristics due to temperature changes.

[0007]

To achieve the above object, the present invention provides a waveguide type optical component comprising a core and a clad, and a light emitting element and a light receiving element optically coupled to the waveguide type optical component. In an optical transceiver in which either one or both are housed in the same housing, a light emitting element or a light receiving element is mounted on a submount, and the submount and the waveguide type optical component are connected via an adapter and guided. Fix any one of waveguide type optical component, adapter and submount to the case,
The other is not fixed to the housing.

According to the present invention, one or both of a waveguide type optical component consisting of a core and a clad and a light emitting element and a light receiving element optically coupled to the waveguide type optical component are housed in the same housing. In the optical transceiver, the light emitting element or the light receiving element is mounted on the submount, and the submount and the waveguide type optical component are connected via an adapter, and at least one of the waveguide type optical component, the adapter and the submount. One is fixed to the housing, and the other is fixed to the housing with an elastic body.

According to the present invention, one or both of a waveguide type optical component consisting of a core and a clad and a light emitting element and a light receiving element optically coupled to the waveguide type optical component are housed in the same housing. In an optical transmitter / receiver, a light emitting element or a light receiving element is mounted on a submount, the submount and the waveguide type optical component are connected via an adapter, and the waveguide type optical component, the adapter and the submount are made of an elastic body. It is fixed to the case.

According to the present invention, one or both of a waveguide type optical component consisting of a core and a clad and a light emitting element and a light receiving element optically coupled with the waveguide type optical component are housed in the same housing. In the optical transmitter / receiver, the light emitting element or the light receiving element is housed in a laser package in advance, and the laser package and the waveguide type optical component are connected via an adapter.

[0011]

According to the above structure, since the submount having the light emitting element or the light receiving element mounted thereon and the waveguide type optical component are connected via the adapter, the light emitting element or the light receiving element is optically coupled to the waveguide type optical component. To be combined. When the temperature changes, the waveguide-type optical component and the housing expand and contract at different expansion rates, but any one of the waveguide-type optical component, the adapter, and the submount is fixed to the housing, and the other is the housing. Since it is not fixed to the body or is supported by the housing with an elastic body, the stress generated in the part connected to the housing is small, and the position of the light emitting element or light receiving element on the waveguide and submount is small. The relationship does not change, the optical axis does not shift, and the characteristics do not deteriorate.

Further, it is not necessary to seal the entire housing by housing the light emitting element or the light receiving element in advance in the laser package and connecting the laser package and the waveguide type optical component through the adapter, and the manufacturing process is Can be simplified.

[0013]

An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a diagram showing an embodiment of an optical transmitter / receiver of the present invention, FIG. 2 is a sectional view of an optical system coupling portion between a waveguide and a light emitting element shown in FIG. 1, and FIG. 3 is FIG. FIG. 7 is a cross-sectional view of an optical system coupling portion between the illustrated waveguide and a light receiving element. The same members as those in the conventional example are designated by the same reference numerals.

A fixed base 21 is provided on the housing 1, and the waveguide 2 is fixed on the fixed base 21 by soldering. The housing 1, and the lid 5 and the fixed base 21 that seal the housing 1 are made of Kovar. Adapters 20 are fixed to the transmitting end and the receiving end of the waveguide 2 by soldering.
As shown in FIG. 2, on the transmission side submount 3, a semiconductor laser 9 as a light emitting element, a photodiode 10 for transmitting power monitor, and an aspherical lens 11 for condensing laser light.
Is fixed. As shown in FIG. 3, a spherical lens 12, a photodiode 13 as a light receiving element, and a preamplifier IC 14 are fixed on the receiving side submount 4.
The transmission side submount 3 and the reception side submount 4 are fixed to the adapter 20 using a YAG laser. The transmitting submount 3 and the receiving submount 4 are not fixed to the housing 1.

Here, in fixing both submounts 3 and 4 with the YAG laser, the transmitting side submount 3 and the receiving side submount 4 are brought into contact with the adapter 20 and the optical axes thereof are aligned in advance. The housing 1 is provided with a lead pin 15, and input / output of a transmission signal and a reception signal is performed through the lead pin 15. The optical coupling between the waveguide 2 and the optical fiber 16 is performed by fusion, and the optical fiber 16 is drawn out of the housing 1.

Next, the operation of the embodiment will be described.

Submount 3 on which the semiconductor laser 9 is mounted
And the waveguide 2 are connected via the adapter 20, and the submount 4 on which the photodiode 13 is mounted and the waveguide 2
Are connected via the adapter 20, the semiconductor laser 9 and the photodiode 13 are connected to the core 7 of the waveguide 2.
Optically coupled with. When the temperature changes, the waveguide 2 and the housing 1 expand and contract at different expansion rates, but the waveguide 2 is fixed to the housing 1, and the adapter 20 and the submounts 3 and 4 are not mounted on the housing 1. Since it is not fixed, the stress generated in the part connected to the housing 1 is slight,
The positional relationship between the waveguide 2 and the semiconductor laser 9 or the photodiode 13 on the submounts 3 and 4 does not change, the optical axis of the optical transceiver does not shift, and the characteristics do not deteriorate.

In this embodiment, the case where the waveguide 2 is fixed to the housing 1 via the fixing base 21 has been described, but the present invention is not limited to this, and the adapter 20 or the submount 3,
It is also possible to fix any one of the four to the housing 1 and not fix the other to the housing 1.

FIG. 4 is a diagram showing another embodiment of the optical transceiver of the present invention.

The difference from the embodiment shown in FIG.
The waveguide 2 is fixed to the housing with a fixed base, and the transmission side submount 3 and the reception side submount 4 are made of an elastic body 22 to form the casing 1
It is a point fixed to.

By doing so, the influence of the temperature change can be prevented, and the vibration of the submount 3 can be damped by the elastic body 22 when the optical transceiver is externally vibrated. Further, if a material that easily conducts heat is used for the elastic body 22, the heat emitted from the semiconductor laser 9, the photodiode 10, etc. can be released to the housing 1.
It is possible to prevent the semiconductor laser 9 and the photodiode 10 from being deteriorated by heat.

FIG. 5 is a diagram showing another embodiment of the optical transceiver of the present invention.

The difference from the embodiment shown in FIG. 1 is that the submount 3 is fixed to the housing 1 by a fixing base 23 and the waveguide 2 is provided.
Is fixed to the housing 1 with the elastic body 24. Also in this case, similarly to the embodiment shown in FIG. 4, when vibration is applied to the optical transceiver from the outside, the vibration of the waveguide 2 can be dumped by the elastic body 24.

The waveguide 2, sub-mant, etc. may be fixed to the housing 1 with an elastic body.

FIG. 6 is a diagram showing another embodiment of the optical transceiver of the present invention.

The difference from the embodiment shown in FIG. 1 is that the semiconductor laser 9 and the photodiode 10 are the laser package 2.
It is a point that is stored in 5.

Even in such a case, the waveguide 2 can be fixed to the housing 1 by the fixing table 26. Here, the laser package 25 is fixed to a holder 27 with a lens, and the holder 27 with a lens is fixed to the adapter 20. By doing so, a commercially available semiconductor laser 9 can be used. Similarly, for the receiving side, a package in which the photodiode 13, the preamplifier IC 14 and the like are sealed can be used. If the semiconductor laser 9, the photodiodes 10, 13 and the like are previously sealed in the package as described above, it is not necessary to seal the entire housing 1, and the manufacturing process can be simplified.

[0029]

In summary, according to the present invention, the following excellent effects are exhibited.

Any one of the waveguide type optical component, the adapter and the submount is fixed to the housing, and the other is not fixed to the housing or is simply supported by the housing by an elastic body. The stress generated on the connection surface is slight, and the optical axis will not shift even if the temperature changes,
It is possible to realize an optical transmitter / receiver without characteristic deterioration.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of an optical transceiver of the present invention.

FIG. 2 is a cross-sectional view of an optical system coupling portion between the waveguide and the light emitting element shown in FIG.

FIG. 3 is a sectional view of an optical system coupling portion between the waveguide and the light receiving element shown in FIG.

FIG. 4 is a diagram showing another embodiment of the optical transceiver of the present invention.

FIG. 5 is a diagram showing another embodiment of the optical transceiver of the present invention.

FIG. 6 is a diagram showing another embodiment of the optical transceiver of the present invention.

FIG. 7 is a conventional example of an optical transmitter / receiver using a waveguide type optical component.

8 is a sectional view of an optical coupling portion between the waveguide and the light emitting element shown in FIG.

9 is a sectional view of an optical coupling portion between the waveguide and the light receiving element shown in FIG.

10 is a sectional view of the waveguide shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Casing 2 Waveguide type optical component (waveguide) 3 Transmission side submount (submount) 4 Reception side submount (submount) 7 Core 8 Cladding 9 Light emitting element (semiconductor laser) 13 Light receiving element (photodiode) 20 adapter

Claims (4)

[Claims] 1. A waveguide type optical component comprising a core and a clad, and one or both of a light emitting element and a light receiving element optically coupled to the waveguide type optical component are housed in the same housing. In an optical transceiver, the light emitting element or the light receiving element is mounted on a submount, and the submount and the waveguide type optical component are connected via an adapter, and the waveguide type optical component, the adapter and the submount are mounted. An optical transmitter / receiver characterized in that any one of the above is fixed to the housing and the other is not fixed to the housing. 2. A waveguide type optical component comprising a core and a clad, and one or both of a light emitting element and a light receiving element optically coupled to the waveguide type optical component are housed in the same housing. In an optical transceiver, the light emitting element or the light receiving element is mounted on a submount, the submount and the waveguide type optical component are connected via an adapter, and the waveguide type optical component, the adapter and the subtype are connected. An optical transceiver, wherein any one of the mounts is fixed to the housing and the other is fixed to the housing with an elastic body. 3. A waveguide type optical component comprising a core and a clad, and one or both of a light emitting element and a light receiving element optically coupled to the waveguide type optical component are housed in the same housing. In an optical transceiver, the light emitting element or the light receiving element is mounted on a submount, the submount and the waveguide type optical component are connected via an adapter, and the waveguide type optical component, the adapter and the subtype are connected. An optical transceiver in which a mount is fixed to the above housing with an elastic body. 4. A waveguide type optical component comprising a core and a clad, and one or both of a light emitting element and a light receiving element optically coupled to the waveguide type optical component are housed in the same housing. In the optical transceiver, the light emitting element or the light receiving element is housed in a laser package in advance, and the laser package and the waveguide type optical component are connected via an adapter.