CN215641959U

CN215641959U - Photoelectric coupling device

Info

Publication number: CN215641959U
Application number: CN202121706398.2U
Authority: CN
Inventors: 田桂霞; 甘飞; 汪军; 李量; 丁晓亮; 梁巍
Original assignee: Hengtong Rockley Technology Co Ltd
Current assignee: Suzhou Zhuoyu Photon Technology Co ltd
Priority date: 2021-07-26
Filing date: 2021-07-26
Publication date: 2022-01-25
Anticipated expiration: 2031-07-26

Abstract

The utility model discloses a photoelectric coupling device, which comprises an FA or PLC array, a glass substrate, a glass cover plate, a refraction focusing lens, a PD array and a heat sink, wherein the glass substrate is arranged on the glass cover plate; the rear end of the refraction focusing lens is provided with a second abutting surface abutted against the first abutting surface, the refraction focusing lens is provided with a total reflection surface, and the bottom of the refraction focusing lens is provided with a spherical array; the PD array is attached to the heat sink, and PDs in the PD array and focusing spherical surfaces in the spherical surface array are arranged in a one-to-one correspondence manner; light output by the FA or PLC array enters the refraction focusing lens through the second abutting surface, the light entering the refraction focusing lens is reflected to the focusing spherical surface through the total reflection surface, and the focusing spherical surface focuses the light to the photosensitive surface of the PD to realize the coupling with the PD. The utility model has the advantages of simple structure, convenient operation, high coupling efficiency and low loss.

Description

Photoelectric coupling device

Technical Field

The utility model relates to the technical field of optical communication, in particular to a photoelectric coupling device.

Background

With the emergence of intelligent devices, cloud computing and the internet of things, the network demand is continuously rising, the transmission rate of the system is urgently increased, and a transmission system with the rate of 100G and higher is gradually applied. For a high-speed optical module, a multi-pass chip integration mode is generally adopted at present to improve the transmission rate of a device. The high-speed PD photosensitive surface is smaller, in order to improve the coupling efficiency of the PD array, one method is to adopt the PD array etched with a silicon lens, the coupling efficiency and the actual assembly operation are simple, but the manufacturing complexity is high, and the other method is to mount the lens array in front of the PD array and converge incident beams to improve the coupling efficiency, but the light path structure is complex, the assembly steps are more, the consumed time is long, and the operation is difficult. In patent 201310433022.X, a reflector and a focusing lens array are fixed together by a structural member, PLC emergent light is coupled into a PD photosensitive surface, and more structural members are used for fixing and aligning, so that the structural members are complicated, the assembling steps are multiple, and the operation is very complicated.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem of providing a photoelectric coupling device with simple structure, high coupling efficiency and low loss.

In order to solve the above problems, the present invention provides a photoelectric coupling apparatus, including:

an FA or PLC array;

the FA or PLC array is arranged between the glass substrate and the glass cover plate in a penetrating mode, and first abutting faces are arranged at the front ends of the glass substrate and the glass cover plate;

the rear end of the refraction focusing lens is provided with a second abutting surface abutted against the first abutting surface, the refraction focusing lens is provided with a total reflection surface, and the bottom of the refraction focusing lens is provided with a spherical array;

the PD array is attached to the heat sink, and PDs in the PD array and focusing spherical surfaces in the spherical array are arranged in a one-to-one correspondence manner;

and the light output by the FA or PLC array enters the refraction focusing lens through the second abutting surface, the light entering the refraction focusing lens is reflected to a focusing spherical surface through the total reflection surface, and the focusing spherical surface focuses the light to a photosensitive surface of the PD to realize the coupling with the PD.

As a further improvement of the present invention, the first abutting surface and the second abutting surface are provided with an anti-reflection angle.

As a further improvement of the utility model, the anti-reflection angle is 4-6 degrees.

As a further improvement of the utility model, the dioptric focusing lens has an imaging ratio of 1: 1.

As a further improvement of the utility model, the single-mode laser mode field diameter output by the FA or PLC array is 9 um; the effective area of the photosensitive surface of the PD is 14-20um, the receiving angle is 0-14 degrees, and the diameter of a focusing light spot is 9 um.

As a further improvement of the utility model, the glass substrate is provided with a V-shaped groove for accommodating the FA or PLC array, and the glass substrate and the glass cover plate are bonded by optical cement to fix the FA or PLC array.

As a further improvement of the utility model, the rear end of the glass substrate extends out of the glass substrate and forms an extension part, and the FA or PLC array is adhered to the bottom of the extension part through optical cement.

As a further improvement of the present invention, the first contact surface and the second contact surface are bonded by an optical adhesive.

As a further improvement of the utility model, the refraction angle of the total reflection surface is more than the total reflection angle of the material thereof by +8 degrees, so as to realize total reflection.

As a further improvement of the utility model, the dioptric focusing lens is obtained by high-refractive-index glass die pressing, silicon-based etching or PC material thermal processing.

The utility model has the beneficial effects that:

the photoelectric coupling device is provided with the refraction focusing lens, and the refraction focusing lens is provided with the total reflection surface and the focusing spherical surface, so that light output by an FA or PLC array directly enters the refraction focusing lens, is reflected to the focusing spherical surface through the total reflection surface, and is focused to the photosensitive surface of a PD through the focusing spherical surface, and the coupling with the PD is realized. The coupling device has the advantages of simple structure, convenience in operation, high coupling efficiency and low loss. Meanwhile, the total reflection angle is utilized, a high reflection film does not need to be plated, and the cost is saved.

The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented in accordance with the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more clearly understood, the following preferred embodiments are described in detail with reference to the accompanying drawings.

Drawings

FIG. 1 is an isometric view of a photocoupler in a preferred embodiment of the present invention;

FIG. 2 is a side view of a photocoupling device in a preferred embodiment of the present invention;

FIG. 3 is a schematic diagram of a refractive focusing lens according to a preferred embodiment of the present invention;

FIG. 4 is an optical path diagram of a dioptric focusing lens and a PD in a preferred embodiment of the utility model.

Description of the labeling: 1. optical cement; 10. an FA or PLC array; 20. a glass substrate; 21. an extension portion; 30. a glass cover plate; 40. a dioptric focusing lens; 41. a second abutting surface; 42. a total reflection surface; 43. focusing a spherical surface; 50. PD; 60. a heat sink.

Detailed Description

The present invention is further described below in conjunction with the following figures and specific examples so that those skilled in the art may better understand the present invention and practice it, but the examples are not intended to limit the present invention.

As shown in fig. 1 to 3, a photocoupling device in a preferred embodiment of the present invention includes: FA or PLC array 10, glass substrate 20, glass cover plate 30, dioptric focusing lens 40, PD50 and heat sink 60.

The glass substrate 20 is arranged on the glass cover plate 30, the FA or PLC array 10 is arranged between the glass substrate 20 and the glass cover plate 30 in a penetrating mode, and first abutting faces are arranged at the front ends of the glass substrate 20 and the glass cover plate 30; a second abutting surface 41 abutting against the first abutting surface is arranged at the rear end of the refraction focusing lens 40, a total reflection surface 42 is arranged on the refraction focusing lens 40, and a spherical array is arranged at the bottom of the refraction focusing lens 40; the PD array is attached to the heat sink 60, and the PDs 50 in the PD array are arranged in one-to-one correspondence with the focusing spheres 43 in the sphere array.

As shown in FIG. 4, the light output by the FA or PLC array 10 enters the refraction focusing lens 40 through the second abutting surface 41, the light entering the refraction focusing lens 40 is reflected to the focusing spherical surface 43 through the total reflection surface 42, and the focusing spherical surface 43 focuses the light to the photosensitive surface of the PD50, so as to realize the coupling with the PD 50.

In some embodiments, the first and second abutment surfaces 41 are provided with an anti-reflection angle, which acts as an anti-reflection. Optionally, the anti-reflection angle is 4-6 degrees. The anti-reflection angle is an angle formed by the abutting surface and the vertical direction of the optical path.

In some embodiments, the imaging ratio of the dioptric focusing lens 40 is 1:1, and the image focal length is about 200um, so that the tolerance of the relative position of the focusing spherical surface 43 and the photosensitive surface of the PD50 during mounting can be ensured to be large, and the mounting operation is facilitated. Optionally, the diameter of the single-mode laser mode field output by the FA or PLC array 10 is 9 um; the effective area of the photosensitive surface of the PD50 is 14-20um, the receiving angle is 0-14 degrees, the diameter of a focusing light spot is 9um, and the PD mounting tolerance is large and is about +/-2.5 um.

Optionally, a V-shaped groove for accommodating the FA or PLC array 10 is formed in the glass substrate 20, and the FA or PLC array 10 is fixed by bonding the glass substrate 20 and the glass cover plate 30 through the optical cement 1. Further, the rear end of the glass substrate 20 extends out of the glass substrate 20 to form an extension portion 21, and the FA or PLC array 10 is bonded to the bottom of the extension portion 21 through the optical adhesive 1, so as to ensure the structural stability of the FA or PLC array 10.

Optionally, the first abutting surface and the second abutting surface 41 are bonded by the optical cement 1, so as to play roles of antireflection and curing.

In some embodiments, the total reflection surface 42 has a refraction angle greater than +8 ° of the total reflection angle of the material, so as to realize the total reflection function.

Optionally, the dioptric focusing lens 40 is obtained by high-refractive-index glass molding, silicon-based etching or thermal processing of a PC material. The method has the advantages of simple preparation, high integration level and high dimensional precision.

When assembling, the FA or PLC array 10 is clamped by the glass substrate 20 and the glass cover plate 30 and is fixed by optical cement to obtain a first structure; then, the first structure and the dioptric focusing lens 40 are attached together, and the first abutting surface and the second abutting surface 41 are bonded through the optical adhesive 1 to form a second structure; then, the PD array is attached to the heat sink 60, the structure two is actively coupled to the PD50, and the glass substrate 20 is bonded to the heat sink 60 by the optical glue 1, completing the assembly.

The above embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the utility model is all within the protection scope of the utility model. The protection scope of the utility model is subject to the claims.

Claims

1. An optoelectronic coupling device, comprising:

an FA or PLC array;

2. The photocoupling device of claim 1, wherein the first and second abutment surfaces are provided with an anti-reflection angle.

3. The photocoupler of claim 2, wherein said anti-reflection angle is 4-6 degrees.

4. The photocoupler of claim 1, wherein said dioptric focusing lens has an imaging ratio of 1: 1.

5. The optoelectronic coupling device of claim 4, wherein the single mode laser mode field diameter of the FA or PLC array output is 9 um; the effective area of the photosensitive surface of the PD is 14-20um, the receiving angle is 0-14 degrees, and the diameter of a focusing light spot is 9 um.

6. The photocoupling device of claim 1, wherein a V-shaped groove is formed on the glass substrate to accommodate the FA or PLC array, and the glass substrate and the glass cover plate are bonded by an optical cement to fix the FA or PLC array.

7. The photocoupling device of claim 6, wherein the back end of the glass substrate extends out of the glass substrate and forms an extension part, and the FA or PLC array is bonded to the bottom of the extension part by an optical cement.

8. The photocoupling device of claim 1, wherein the first and second abutment surfaces are bonded by optical glue.

9. The photocoupler of claim 1, wherein the angle of refraction of said total reflecting surface is greater than the angle of total reflection +8 ° of its material, achieving total reflection.

10. The photocoupler of claim 1, wherein said dioptric focusing lens is obtained by high refractive index glass embossing, silicon-based etching or PC material thermal processing.