Self-coupling optical module and self-coupling method thereof

Abstract

The application relates to a self-loop coupling light module, which comprises a PCB board and a lens arranged above the PCB board, a plurality of lasers and a plurality of photodiodes are arranged on the PCB board, and each laser corresponds to each photodiode; a hole is arranged on the lens, one surface of the hole is a light surface, part of light emitted by the laser is reflected to the photodiode by the light surface, and the other part of light passes through the light surface and enters a fiber band, and the light emitted by the laser farthest from the photodiode is reflected by the light surface and is shot into the photodiode farthest from the laser to realize self-loop coupling. A self-loop coupling method of the self-loop coupling light module is also provided. In the coupling, the light emitted by the laser farthest from the photodiode is bent by the cubic hole and is concentrated into the photodiode farthest from the laser by the newly-added converging lens to realize self-loop coupling, and a light power meter is no longer needed, and an external fiber band is also no longer needed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of optical modules, in particular to a self-loop coupling optical module and a self-loop coupling method thereof. BACKGROUND

[0002] Figure 1 Fig. 1 is a structural schematic diagram of a four-way parallel 100G SR4 optical module, which comprises a PCB board 1, a lens 2, a fiber ribbon 4 with an MT head 3, four lasers 7 and four photoelectric diodes 6 for receiving light, a laser driver 14 and a TIA 15. Figure 2 Fig. 2 is a light path schematic diagram of the four-way parallel 100G SR4 optical module, in which the light emitted from the laser is collimated by the lens, then is bent by the total reflection surface, and then is coupled into the optical fiber through the converging lens; the light coming from the optical fiber is collimated by the lens, then is bent by the total reflection surface, and then is coupled into the photoelectric diode through the converging lens.

[0003] Fig. 3 is a schematic diagram of lens coupling of a common 100G SR4 product, in which the fiber ribbon is connected through the MT and the lens, the other end of the fiber ribbon is connected to the four optical fibers for emitting light and connected to the light power meter, the four optical fibers for receiving light are connected to the light source, the laser is turned on by powering the PCBA, then the lens is sucked by the coupling suction nozzle 5, the position of the lens is adjusted in the XYZ three directions, the light power monitored by the light power meter and the responsivity of the receiving PD are maximized at the same time, then the UV glue is applied at the connection between the lens and the PCBA, and then the UV lamp is turned on to cure the UV glue, thereby completing the coupling. Figure 3

[0004] The common coupling mode has the following disadvantages:

[0005] 1. The coupling of the emitting end needs to be connected to the light power meter, and the coupling of the receiving end needs to be connected to the light source.

[0006] 2. The coupling needs to be connected to the optical fiber, which increases the difficulty of sucking the lens by the suction nozzle, and the lens is prone to position deviation, thereby causing coupling displacement or coupling failure. SUMMARY

[0007] The present application aims to provide a self-loop coupling optical module and a self-loop coupling method thereof, which can at least solve some defects in the prior art.

[0008] ​To achieve the above object, the embodiment of the present application provides the technical scheme as follows: a self-loop coupling optical module, comprising a PCB board and a lens arranged above the PCB board, a same number of lasers and photodiodes are arranged on the PCB board, each laser corresponds to each photodiode; a hole is arranged on the lens, one face of the hole is a light face, after the light emitted by the laser is incident on the light face, part of the light is reflected to the photodiode by the light face, and the other part of the light passes through the light face and enters a fiber ribbon, the light emitted by the laser farthest from the photodiode is reflected by the light face and is incident in the photodiode farthest from the laser to perform self-loop coupling.

[0009] Further, each photodiode and each laser are arranged in a line, and each photodiode and each laser are located on the same line, in the direction from each laser to each photodiode, the light emitted by the first laser is reflected by the light face and is incident on the last photodiode to perform self-loop coupling.

[0010] Further, the hole is a cubic hole, and one side wall of the cubic hole is the light face.

[0011] Further, the lens is in a cubic shape, a corresponding face of the lens and the fiber ribbon is an exit face, the cubic hole is arranged obliquely, and an included angle between the light face and the exit face is an acute angle.

[0012] Further, the acute angle is between 1-20°.

[0013] Further, the light emitted by the laser passes through a light collimation lens to be collimated, then passes through a total reflection face to be bent, and then is incident on the light face. The total reflection face is arranged on the lens.

[0014] Further, the light reflected by the light face to the photodiode passes through a converging lens to be converged, and then is incident on the photodiode.

[0015] Further, the converging lens is arranged on the lens.

[0016] The embodiment of the present application provides another technical scheme: a self-loop coupling method of the self-loop coupling optical module, characterized by comprising the following steps:

[0017] S1, power on the PCB A to make each laser emit light;

[0018] S2, sucking the lens with the suction nozzle, adjusting the position of the lens in three directions of XYZ and the angle of the lens, monitoring the responsivity of the photodiode farthest from the laser, making the responsivity of the photodiode reach a predetermined specification value and as large as possible, and ensuring that the light emitted by the laser farthest from the photodiode is reflected by the light surface and then shot into the photodiode farthest from the laser;

[0019] S3, dispensing glue at the joint between the lens and the PCBA and UV curing the glue to fix the lens;

[0020] S4, dispensing non-transparent glue on the surface opposite to the light surface of the hole to prevent the reflected light from entering the photodiode of the receiving end during the use of the optical module.

[0021] Further, before or after the S4 step, the coupled optical module is placed in an oven for further curing of the glue.

[0022] Compared with the prior art, the beneficial effects of the present application are:

[0023] 1. When coupling, the light emitted by the laser farthest from the photodiode is bent by the cube hole and the newly added converging lens to converge into the photodiode farthest from the laser, and self-loop coupling is performed, and a light power meter is no longer needed.

[0024] 2. Since self-loop coupling is used, an optical fiber is not needed, and the stability of sucking the lens is increased.

[0025] 3. The present application does not need to connect an optical fiber, so it is also free of plugging and unplugging the optical fiber, and therefore the problem of end face damage existing in the traditional scheme does not exist. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a structural schematic diagram of a traditional 100G SR4 optical module;

[0027] Figure 2 is Figure 1 is a light path schematic diagram of a self-loop coupling optical module provided by the embodiment of the present application (only one light path is shown, and the direction of the arrow is the direction of the light);

[0028] Figure 3 is a lens coupling schematic diagram of a traditional 100G SR4 optical module;

[0029] Figure 4 is a light path schematic diagram of a self-loop coupling optical module provided by the embodiment of the present application (only one light path is shown, and the direction of the arrow is the direction of the light);

[0030] Figure 5A-A sectional view of the self-coupling optical module provided by the embodiment of the present application;

[0031] Figure 6 A-A sectional view of the self-coupling optical module provided by the embodiment of the present application; Figure 5 A-A sectional view of the self-coupling optical module provided by the embodiment of the present application;

[0032] Figure 7 A-A sectional view of the self-coupling optical module provided by the embodiment of the present application;

[0033] In the drawing, 1-PCB board; 2-lens; 3-MT head; 4-optical fiber ribbon; 5-coupling suction nozzle; 6-photodiode; 7-laser; 8-full reflection surface; 9-cubic hole; 10-light surface; 11-emission surface; 12-converging lens; 13-opaque glue; 14-driver; 15-TIA. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0035] Please refer to Figure 4 , Figure 5 , Figure 6 and Figure 7The embodiment of the present application provides a self-loop coupling optical module, which comprises a PCB board 1 and a lens 2 arranged above the PCB board 1, characterized in that: a plurality of lasers 7 and a plurality of photodiodes 6 are arranged on the PCB board 1, and each laser 7 corresponds to each photodiode 6; a hole is arranged on the lens 2, one face of the hole is a light surface 10, a part of light emitted by the laser 7 is reflected to the photodiode 6 by the light surface 10, and another part of light passes through the light surface 10 and enters a fiber band 4, and the light emitted by the laser 7 farthest from the photodiode 6 is reflected by the light surface 10 and then enters the photodiode 6 farthest from the laser 7 to realize self-loop coupling. In the embodiment, the light emitted by the laser 7 farthest from the photodiode 6 is reflected by the light surface 10 and then enters the photodiode 6 farthest from the laser 7 to realize self-loop coupling, so that a light power meter is no longer needed, an optical fiber is no longer needed, the stability of the lens 2 is improved, and the end face damage problem of the traditional scheme is avoided. Specifically, the hole is arranged on the lens 2, the light surface 10 capable of reflecting a part of light and transmitting another part of light is designed, the reflected light is used to realize self-loop coupling, and a series of problems in the traditional technology can be solved.

[0036] As an optimization scheme of the embodiment of the present application, refer to Figure 4 、 Figure 5 、 Figure 6 and Figure 7 , each photodiode 6 and each laser 7 are arranged in a line, and each photodiode 6 and each laser 7 are located on the same line, in the direction from each laser 7 to each photodiode 6, the light emitted by the first laser 7 is reflected by the light surface 10 and then enters the last photodiode 6 to realize self-loop coupling. In the embodiment, four lasers 7 and four photodiodes 6 are exemplified, as shown in the figure, the four lasers 7 and the four photodiodes 6 are vertically arranged on the paper, so that the light emitted by the lowermost laser 7 is reflected by the light surface 10 and then enters the uppermost photodiode 6 to realize self-loop coupling, and the other light is sequentially emitted according to the order.

[0037] As an optimization scheme of the embodiment of the present application, refer to Figure 4 、 Figure 5 、 Figure 6 and Figure 7The hole is a cubic hole 9, one of the side walls of the cubic hole 9 is the smooth surface 10. In this embodiment, the hole is refined into a cubic hole 9, which is more convenient for making the reflective and transmissive smooth surface 10, which is a plane and can partially reflect light. Of course, the hole can be made into other shapes, as long as it can have the smooth surface 10.

[0038] Further optimization of the above scheme, please refer to Figure 4 、 Figure 5 、 Figure 6 and Figure 7 The lens 2 is in the shape of a cube, the face of the lens 2 corresponding to the optical fiber strip 4 is the exit face 11, the cubic hole 9 is arranged obliquely, and the included angle between the smooth surface 10 and the exit face 11 is an acute angle. In this embodiment, in order to ensure that the light emitted by the laser 7 farthest from the photodiode 6 is reflected by the smooth surface 10 and then enters the photodiode 6 farthest from the laser 7 for self-loop coupling, the included angle between the smooth surface 10 and the exit face 11 should be an acute angle, so that the light emitted by the lowermost laser 7 can be reflected by the smooth surface 10 and then enter the uppermost photodiode 6. Preferably, the acute angle is between 1 and 20 degrees, and the specific value is related to the actual optical path. As shown in Figure 5 and Figure 6 , in the top view, the included angle is α, and in the vertical view of the cross-sectional view, the included angle is β, it is necessary to ensure that both α and β are acute angles and are controlled to be between 1 and 20 degrees.

[0039] As an optimization scheme of the embodiment of the present application, please refer to Figure 4 、 Figure 5 、 Figure 6 and Figure 7 The light emitted by the laser 7 first passes through a collimating lens for collimation, then is bent by a total reflection face 8 and then is incident on the smooth surface 10, and the total reflection face 8 is arranged on the lens 2. The light reflected by the smooth surface 10 to the photodiode 6 first passes through a converging lens 12 for convergence and then is incident on the photodiode 6. The converging lens 12 is arranged on the lens 2. In this embodiment, the light emitted from the laser 7 is collimated by the collimating lens, is bent by the total reflection face and then forms two light paths through the cubic hole 9, one light path passes through the cubic hole 9 and then enters the optical fiber strip 4 through the converging lens, and the other light path is reflected by the right side face of the cubic hole 9 and then advances toward the photodiode 6, is bent by the total reflection face and then enters the Figure 4 uppermost photodiode 6 through the newly added converging lens 12.

[0040] Please refer to Figure 4 、 Figure 5 、 Figure 6 and Figure 7The self-coupling method of the self-coupling optical module provided by the embodiment of the application comprises the following steps: S1, powering the PCBA to make each laser 7 emit light; S2, sucking the lens 2 by using a suction nozzle, adjusting the positions of the lens 2 in three directions X, Y and Z and the angle of the lens 2, monitoring the responsivity of the photodiode 6 farthest from the laser 7, making the responsivity of the photodiode 6 reach a predetermined specification value and be as large as possible, and ensuring that the light emitted by the laser 7 farthest from the photodiode 6 is reflected by the light surface 10 and then shot into the photodiode 6 farthest from the laser 7; S3, dispensing glue at the joint between the lens 2 and the PCBA and UV curing the glue to fix the lens 2; and S4, dispensing non-transparent glue 13 on the surface opposite to the light surface 10 of the hole to prevent the reflected light from entering the photodiode 6 of the receiving end during the use of the optical module and causing crosstalk. In the embodiment, the non-transparent glue 13 is arranged to prevent the reflected light from entering the photodiode 6 of the receiving end during the use of the optical module and causing crosstalk. The step is performed after the coupling is completed.

[0041] As an optimization scheme of the embodiment of the application, please refer to Figure 4 、 Figure 5 、 Figure 6 and Figure 7 Before or after the S4 step, the coupled optical module is placed into an oven for baking to further cure the glue. In the embodiment, the oven baking for curing the glue can be performed before the S4 step or after the S4 step. If the oven baking is performed before the S4 step, the non-transparent glue 13 used is required to be baked. If the oven baking is performed after the S4 step, the glue used does not need to be baked.

[0042] Although the embodiments of the application have been shown and described, it should be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the application, and the scope of the application is defined by the appended claims and their equivalents.

Claims

1. A self-coupled optical module, comprising a PCB board and a lens arranged above the PCB board, characterized in that: The PCB is provided with a plurality of lasers and a plurality of photodiodes, each laser and each photodiode corresponding to each other; the lens is provided with a hole, one of the faces of the hole is a light surface, a part of the light emitted by the laser is reflected to the photodiode at the receiving end after the light emitted by the laser is incident on the light surface, and the other part of the light passes through the light surface and enters the optical fiber ribbon, the light emitted by the laser farthest from the photodiode is reflected by the light surface and is incident in the photodiode farthest from the laser for self-loop coupling, the hole is a cubic hole, one of the side walls of the cubic hole is the light surface, the lens is in the shape of a cube, the face of the lens corresponding to the optical fiber ribbon is an exit face, the cubic hole is arranged obliquely, and the included angle between the light surface and the exit face is an acute angle.

2. The self-coupled optical module of claim 1, wherein: Each photodiode and each laser are arranged in a straight line, and each photodiode and each laser are located on the same line, and in the direction from each laser to each photodiode, the light emitted by the first laser is reflected by the light surface and is incident on the last photodiode for self-loop coupling.

3. The self-coupled optical module of claim 1, wherein: The acute angle is between 1 and 20 degrees.

4. The self-coupled optical module of claim 1, wherein: The light emitted by the laser is first collimated by a collimating lens, then bent by a total reflection face, and then incident on the light surface, and the total reflection face is provided on the lens.

5. The self-coupled optical module of claim 1, wherein: The light reflected by the light surface to the photodiode is first converged by a converging lens and then incident on the photodiode.

6. The self-coupled optical module of claim 5, wherein: The converging lens is provided on the lens.

7. A self-coupling method of a self-coupling optical module as claimed in any one of claims 1 to 6, characterized in that, The method comprises the following steps: S1, power on the PCB to make each laser emit light; S2, use a suction nozzle to suck the lens, adjust the position of the lens in XYZ three directions and the angle of the lens, monitor the responsivity of the photodiode farthest from the laser, make the responsivity of the photodiode reach a predetermined specification value and as large as possible, and ensure that the light emitted by the laser farthest from the photodiode is reflected by the light surface and is incident in the photodiode farthest from the laser; S3, point glue at the joint of the lens and the PCB and UV cure the glue to fix the lens; S4, point opaque glue on the face opposite to the light surface of the hole to prevent the reflected light from entering the photodiode at the receiving end during use of the optical module and causing crosstalk.

8. The self-coupled method of claim 7, wherein: Before or after the S4 step, place the coupled optical module in an oven to bake and further cure the glue.

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