CN210222305U

CN210222305U - Small-size multichannel light receiving module structure

Info

Publication number: CN210222305U
Application number: CN201921391610.3U
Authority: CN
Inventors: Hongjie Wang; 王红杰; Yongzhen Wang; 王永贞; Jianguang Li; 李建光; Xiaolei Li; 李小磊; Liankun Ma; 马连坤; Shanshan Niu; 牛珊珊; Wenbin Wang; 王文宾; Luping Dong; 董璐平
Original assignee: HENAN SHIJIA PHOTONS TECHNOLOGY Co Ltd
Current assignee: HENAN SHIJIA PHOTONS TECHNOLOGY Co Ltd
Priority date: 2019-08-26
Filing date: 2019-08-26
Publication date: 2020-03-31
Anticipated expiration: 2029-08-26

Abstract

The utility model provides a little volume multichannel light receiving module structure, including tube and single channel fiber array, be equipped with multichannel demultiplexer and multichannel PD array single channel fiber array in the tube and include fiber adapter, single mode fiber and capillary. The optical fiber adapter is fixed on the outer side of the tube shell, one end of the single-mode optical fiber penetrates through the tube shell to be connected with the optical fiber adapter, the other end of the single-mode optical fiber penetrates through the capillary tube to be coupled with the multichannel demultiplexer, and the multichannel demultiplexer is opposite to the multichannel PD array. The utility model utilizes the structure of tube shell separation to separate the packaging and connecting process of each part, thereby effectively reducing the complexity of the packaging process, improving the packaging quality and being beneficial to mass large-scale production; and the single-channel optical fiber array at the input end uses flexible short optical fibers, and the output end of the multi-channel demultiplexer is directly aligned and coupled with the PD in an alignment manner, so that the multi-channel optical fiber array has the advantages of simple structure, small volume, good stability, obvious effect and the like.

Description

Small-size multichannel light receiving module structure

Technical Field

The utility model relates to a communication equipment especially indicates a little volume multichannel light receiving module structure.

Background

An optical module is a hot spot of research in the field of optical communication as a core device of optical communication. With the rise of hot spot applications such as fiber to the home and all optical networks, the application of the optical module is more and more extensive, and the requirement on the optical module is higher and higher, and with the increasing demands on transmission bandwidth and transmission rate, the design of the optical module is developed towards the trend of small volume, high integration, multiple channels and high reliability. These demands have also promoted the development of optical module manufacturing technology and packaging technology, wherein the integration degree of the device and the volume requirement of the assembly make various integration technologies and methods for reducing the volume of the assembly widely used in the system.

One of the current multichannel light receiving devices including the wavelength division multiplexing technology adopts a Thin Film Filter (TFF) technology, and the other adopts a planar optical waveguide (AWG) technology. Compared with TFF, the use of AWG has a smaller waveguide size with waveguides, making it easier to form high-density package structures. In the structure and packaging design of the light receiving module, one scheme adopted by the light receiving component is that a single-mode optical fiber with the length of about 20mm is used at the input end, and a reserved space in the packaging is coiled with the optical fiber; and the other method is to directly penetrate the output optical fiber into the ceramic ferrule of the connector in order to reduce the volume, so that the input end is hard connected, and the stress, the damage and the like of the optical fiber are easy to occur. For example, as disclosed in "a package structure of a light receiving/transmitting sub-module and a method for manufacturing the same" (application No. 201510930531.5), the AWG is directly output to the photodetector, so that the operation process is simplified, but the problems of the overall structure design and the module package volume are not considered, and the pigtail is long; as disclosed in the invention patent "multichannel light receiving device and receiving module" (application No. 201710210467.2), the output end of AWG first receives the output light of AWG by using multichannel fiber array, and then couples to PD, so that the volume is increased, and the return loss is increased due to the introduction of light reflection by the addition of fiber array at the output end, which may affect the performance such as light receiving sensitivity.

SUMMERY OF THE UTILITY MODEL

The utility model provides a little volume multichannel light receiving module structure has solved the problem that current multichannel light receiver is bulky, the reliability is poor.

The technical scheme of the utility model is realized like this: the utility model provides a little volume multichannel light receiving module structure, includes tube and single channel fiber array, the tube in be equipped with multichannel demultiplexer and multichannel PD array single channel fiber array and include fiber adapter, single mode fiber and capillary, fiber adapter fixes the outside at the tube, single mode fiber one end is passed the tube and is connected with fiber adapter, the single mode fiber other end penetrates the capillary and is connected with multichannel demultiplexer coupling, multichannel demultiplexer is relative with multichannel PD array.

The shell comprises an upper cover, a rear cover and a shell, the optical fiber adapter is fixed on the rear cover, the multichannel demultiplexer and the multichannel PD array are fixed on the shell, and the upper cover is fixed at the upper ends of the rear cover and the shell.

The multichannel demultiplexer is positioned on the support plate, and the support plate is fixed on the shell of the tube shell.

The multichannel PD array is located on the substrate, a transimpedance amplifier array and a flexible flat cable are arranged on the substrate, the substrate is fixed on a shell of the tube shell, and the flexible flat cable is exposed out of the shell.

The optical fiber adapter is glued and fixed in the cylindrical hole of the rear cover, and the cylindrical hole is communicated with the glue injection hole on the rear cover.

The single mode fiber is a flexible short fiber, and the length of the flexible short fiber is 3-5 mm.

The single mode fiber is glued with the fiber adapter, the single mode fiber is glued with the capillary, and the single mode fiber is glued with the multichannel demultiplexer in a coupling mode through ultraviolet glue.

The connecting end surfaces of the capillary tube and the multi-channel demultiplexer are inclined end surfaces which are matched with each other and have an angle of 8 degrees.

The multichannel demultiplexer is a plane waveguide grating demultiplexer.

The output end of the multi-channel demultiplexer is an inclined end face with an angle of 45 degrees or 8 degrees.

The utility model has the advantages that: in structure and packaging manufacture, the shell of the tube shell is separated from the rear cover, the flexible short optical fiber passes through the rear cover to be connected with the adapter, and meanwhile, the adapter is partially inserted into the rear cover and fixed, so that on one hand, the possibility of operation of the flexible short optical fiber is realized, on the other hand, the assembly and coupling processes of each component can be separated, the complexity of the packaging process is effectively reduced, the packaging quality is improved, the flexible short optical fiber packaging device is suitable for assembly line operation and mass large-scale production, and has the characteristics of small volume, high reliability and the like; the input end is connected with the AWG chip by adopting the flexible short optical fiber, so that the stress generated by hard connection is avoided, meanwhile, the short optical fiber does not need to increase the volume, and the stability of the system is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a front view of embodiment 1.

FIG. 2 is a top view of embodiment 1.

Fig. 3 is a front view of the tube case of embodiment 1.

Fig. 4 is a front view of a single-channel fiber array of embodiment 1.

FIG. 5 is an assembly diagram of a single channel fiber array of example 1.

FIG. 6 is an assembly view of a base according to embodiment 1.

FIG. 7 is a front view of embodiment 2.

In the figure: the optical fiber array comprises a shell 1, an upper cover 101, an upper cover 102, a rear cover 1021, a cylindrical hole 1022, a glue injection hole 103, a shell 2, a single-channel optical fiber array 201, an optical fiber adapter 202, a single-mode optical fiber 203, a capillary tube 3, a multichannel demultiplexer 4, a multichannel PD array 5, a transimpedance amplifier array 6, a substrate 7, a support plate 8 and a flexible flat cable.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without any creative effort belong to the protection scope of the present invention.

Example 1

As shown in fig. 1 to 6, a small-sized multichannel light receiving module structure includes a package 1, a single-channel fiber array 2, a multichannel demultiplexer 3, a multichannel PD array 4, a transimpedance amplifier array 5, a base 6, a support plate 7, and a flexible flat cable 8. The package 1 comprises an upper cover 101, a rear cover 102 and a housing 103, and the single-channel fiber array 2 comprises a fiber adapter 201, a single-mode fiber 202 and a capillary 203.

The upper cover 101, the rear cover 102 and the housing 103 enclose a closed packaging space. The optical fiber adapter 201 is located outside the rear cover 102 and is glued and fixed in the cylindrical hole 1021 of the rear cover 102, and the cylindrical hole 1021 is communicated with the glue injection hole 1022 on the rear cover 102, so that glue injection packaging of the optical fiber adapter is facilitated. The upper cover 101 covers the upper portions of the rear cover 102 and the housing 103 to facilitate connection of internal components before being unpackaged.

The single mode fiber 202 is a flexible short fiber, and the length of the flexible short fiber is 3-5 mm. One end of the single-mode fiber 202 penetrates through the rear cover 102 and is glued with the fiber adapter 201, the other end of the single-mode fiber 202 penetrates through the capillary 203 and is glued in the capillary 203, and the single-mode fiber 202 penetrates through the capillary 203 and is then coupled with the multichannel demultiplexer 3 through ultraviolet glue and is glued.

The multi-channel demultiplexer 3 is a planar waveguide grating demultiplexer, the connection end surfaces of the capillary 203 and the multi-channel demultiplexer 3 are inclined end surfaces which are matched with each other and have an angle of 8 degrees, the output end of the multi-channel demultiplexer 3 is an inclined end surface with an angle of 45 degrees, and the multi-channel PD array 4 is placed right below the emission inclined end surface and corresponds to the multi-channel demultiplexers 3 one by one.

The multichannel demultiplexer 3 is located on a support plate 7, the support plate 7 is fixed on the housing 103, the multichannel PD array 4, the transimpedance amplifier array 5, and the flexible flat cable 8 are located on a substrate 6, the substrate 6 is fixed on the housing 103, and the flexible flat cable 8 is exposed out of the housing 103 and used for receiving and outputting an electrical signal.

Light with different wavelengths enters from the optical fiber adapter, the single-mode optical fiber adopts the flexible short optical fiber, and the flexible short optical fiber is used as transition between the optical fiber adapter and the capillary tube through the flexible short optical fiber and the capillary tube, so that the stress generated by hard connection can be effectively avoided, and the structure is more stable and reliable. The multichannel demultiplexer adopts a planar waveguide grating demultiplexer (AWG), has the advantages of small volume, high integration level and the like, and then light enters the AWG and is decomposed into multipath optical signals with different wavelengths. The end face of the capillary 203 and the end face connected with the AWG are ground into oblique optical end faces with the directions matched and the angles of 8 degrees, so that the light reflection can be effectively reduced, and the return loss is reduced. The end face of the output end of the AWG is ground into a 45-degree oblique optical reflecting surface, the PD array is positioned right below the reflecting inclined surface and is in one-to-one correspondence with the output of the AWG, input light enters the PD array 4 for detection and reception after being deflected by 90 degrees after passing through the 45-degree ground end face, and then is output after being subjected to photoelectric conversion.

The packaging method of the embodiment comprises the following steps:

step 1, grinding and polishing the coupling input end of the capillary tube and the multichannel demultiplexer into an 8-degree optical plane, and grinding the output end of the capillary tube and the multichannel demultiplexer into a 45-degree optical plane.

And 2, assembling the single-channel optical fiber array, wherein one end of the flexible short optical fiber penetrates through the rear cover to be connected with the optical fiber adapter, and the other end of the flexible short optical fiber penetrates through the capillary tube and is fixed by thermosetting adhesive.

And 3, aligning and coupling the single-channel optical fiber array and the input end of the multi-channel demultiplexer, and fixing the single-channel optical fiber array and the input end of the multi-channel demultiplexer by ultraviolet glue.

And 4, placing the multichannel demultiplexer on a support plate on the shell, aligning the output end with the multichannel PD array, fixing the positions of the multichannel demultiplexer and the rear cover by using thermosetting adhesive, and packaging the upper cover to finish the final assembly of the small-volume multichannel light receiving module.

Example 2

As shown in fig. 7, a small-sized multi-channel light receiving module structure is different from that of embodiment 1, an output end of a multi-channel demultiplexer 3 of this embodiment is ground into an 8-degree optical plane, and a structure of a substrate 6 is adjusted at the same time, so that a multi-channel PD array 4 is perpendicularly attached to the substrate 6, and the multi-channel PD arrays of output channels of the multi-channel demultiplexer 3 correspond to one another.

Other structures and packaging method steps of this embodiment are the same as those of embodiment 1.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A small-size multichannel light receiving module structure comprises a tube shell (1) and a single-channel optical fiber array (2), and is characterized in that: the optical fiber coupling type multi-channel optical fiber tube is characterized in that a multi-channel demultiplexer (3) and a multi-channel PD array (4) are arranged in a tube shell (1), the single-mode optical fiber (202) and a capillary tube (203) are arranged in the single-channel optical fiber array (2), the single-mode optical fiber adapter (201) is fixed on the outer side of the tube shell (1), one end of the single-mode optical fiber (202) penetrates through the tube shell (1) to be connected with the optical fiber adapter (201), the other end of the single-mode optical fiber (202) penetrates through the capillary tube (203) to be coupled with the multi-channel demultiplexer (3), and the multi.

2. The small-volume multi-channel light receiving module structure according to claim 1, wherein: the tube shell (1) comprises an upper cover (101), a rear cover (102) and a shell (103), wherein an optical fiber adapter (201) is fixed on the rear cover (102), a multi-channel demultiplexer (3) and a multi-channel PD array (4) are fixed on the shell (103), and the upper cover (101) is fixed at the upper ends of the rear cover (102) and the shell (103).

3. The small-volume multi-channel light receiving module structure according to claim 1 or 2, wherein: the multichannel demultiplexer (3) is positioned on the support plate (7), and the support plate (7) is fixed on the shell (103) of the tube shell (1).

4. The small-volume multi-channel light receiving module structure according to claim 1 or 2, wherein: the multichannel PD array (4) is located on the substrate (6), the transresistance amplifier array (5) and the flexible flat cable (8) are arranged on the substrate (6), the substrate (6) is fixed on the shell (103) of the tube shell (1), and the flexible flat cable (8) is exposed out of the shell (103).

5. The small-volume multi-channel light receiving module structure according to claim 2, wherein: the optical fiber adapter (201) is glued and fixed in a cylindrical hole (1021) of the rear cover (102), and the cylindrical hole (1021) is communicated with a glue injection hole (1022) on the rear cover (102).

6. The small-volume multi-channel light receiving module structure according to claim 1, wherein: the single mode fiber (202) is a flexible short fiber, and the length of the flexible short fiber is 3-5 mm.

7. The small-volume multi-channel light receiving module structure according to claim 1, wherein: the single mode fiber (202) is glued with the fiber adapter (201), the single mode fiber (202) is glued with the capillary tube (203), and the single mode fiber (202) is coupled with the multichannel demultiplexer (3) through ultraviolet glue.

8. The small-volume multi-channel light receiving module structure according to claim 1, wherein: the connecting end surfaces of the capillary tube (203) and the multi-channel demultiplexer (3) are inclined end surfaces which are matched with each other and have an angle of 8 degrees.

9. The small-volume multi-channel light receiving module structure according to claim 1, wherein: the multichannel demultiplexer (3) is a plane waveguide grating demultiplexer.

10. The small-volume multi-channel light receiving module structure according to claim 1, wherein: the output end of the multi-channel demultiplexer (3) is an inclined end face with an angle of 45 degrees or 8 degrees.