阅读说明：本技术 一种光接收组件及光模块 (Light receiving assembly and optical module ) 是由 岳阳阳 陈土泉 刘成刚 于 2021-06-29 设计创作，主要内容包括：本发明涉及光通讯领域,提供了一种的光接收组件及光模块,包括光纤阵列、多个光电检测器、挡光件。光纤阵列设置有多个光纤,多个光电检测器间隔设置,每个光电检测器均设置在一个光纤的延伸方向上,且光电检测器与光纤一一对应,相邻的光电检测器之间设置有挡光件。本发明中光线传输到光接收组件后根据不同的波长,进入相应的光纤中传输后被相应的光电检测器吸收,在相邻的光电检测器之间设置挡光件,通过设置该挡光件,光线在传出光线通道后会被挡光件阻挡,避免其进入相邻的光电检测器中,从而避免了光串扰,提高了光纤之间的隔离度。(The invention relates to the field of optical communication, and provides an optical receiving assembly and an optical module. The optical fiber array is provided with a plurality of optical fibers, a plurality of photoelectric detectors are arranged at intervals, each photoelectric detector is arranged in the extending direction of one optical fiber, the photoelectric detectors correspond to the optical fibers one to one, and light blocking pieces are arranged between the adjacent photoelectric detectors. According to the invention, light rays enter corresponding optical fibers after being transmitted to the light receiving assembly according to different wavelengths and are absorbed by corresponding photoelectric detectors after being transmitted, the light blocking piece is arranged between adjacent photoelectric detectors, and the light rays are blocked by the light blocking piece after being transmitted out of the light ray channel by the light blocking piece, so that the light rays are prevented from entering the adjacent photoelectric detectors, thereby avoiding optical crosstalk and improving the isolation between the optical fibers.)

1. A light receiving module, comprising:

the optical fiber array is used for receiving and transmitting light separated into a plurality of wavelengths, and comprises a plurality of optical fibers, and each optical fiber correspondingly transmits the light with one wavelength;

the photoelectric detectors are arranged at intervals, each photoelectric detector is arranged in the extending direction of one optical fiber, and the photoelectric detectors correspond to the optical fibers one by one; the photoelectric detector is used for receiving light rays emitted by the corresponding optical fiber;

and the light blocking piece is arranged between two adjacent photoelectric detectors so as to block light rays emitted by optical fibers which do not correspond to the photoelectric detectors from entering the photoelectric detectors.

2. The light-receiving module according to claim 1, wherein an extending direction of the plurality of optical fibers and an extending direction of the plurality of photodetectors are substantially the same, wherein the photodetectors are spaced from the corresponding optical fibers by a predetermined distance in the extending direction.

3. The light-receiving assembly according to claim 1 or 2, further comprising a circuit board on which the optical fiber array, the photodetector, and the light blocking member are disposed.

4. The light-receiving module of claim 3, further comprising a beam splitter adjacent to the array of optical fibers and disposed on a side of the array of optical fibers away from the photodetector; the light splitter is used for splitting the light into light with a plurality of wavelengths.

5. The light-receiving module of claim 3, wherein the circuit board is further provided with a metal plating layer, and the photodetector and the optical fiber array are attached to the metal plating layer.

6. The light-receiving module as claimed in claim 5, wherein the metal plating layer includes a first metal plating layer for mounting the photodetector and the optical fiber array and a second metal plating layer for providing a lead wire connecting the photodetector.

7. The light receiving module of claim 3 wherein the circuit board is further provided with a kovar heat sink on which the array of optical fibers is placed.

8. The light receiving module as claimed in claim 3, wherein the circuit board further has a fixing pad for carrying the photodetector, and the photodetector is disposed on the fixing pad.

9. The light receiving module of claim 8, wherein the circuit board further has a spacer block for supporting the fixing block, one end surface of the spacer block is in contact with the circuit board, and the other end surface of the spacer block is in contact with the fixing block.

10. A light module, comprising:

a light emitting assembly for emitting light;

the light receiving module of any one of claims 1-9, wherein the light receiving module receives light emitted from the light emitting module.

Technical Field

The present invention relates to the field of optical communications technologies, and in particular, to an optical receiving module and an optical module.

Background

The optical module is an important device for realizing photoelectric conversion in an optical fiber communication system, and mainly comprises a light emitting component and a light receiving component. Generally, an optical transmitting assembly converts an electrical signal into an optical signal through a laser, an optical receiving assembly includes an optical fiber and a photodetector, and the optical signal emitted by the optical transmitting assembly is transmitted through the optical fiber; the photoelectric detector receives the optical signal transmitted by the optical fiber and converts the optical signal into an electrical signal, thereby realizing the photoelectric conversion function of the optical module.

In the related optical receiving assembly, there is a case of receiving a plurality of optical signals transmitted by optical fibers at the same time, and due to the existence of a spacing space between the photodetector and the optical fibers, the optical signals are diffused and transmitted in the spacing space after being emitted by the optical fibers, so that the photodetector corresponding to the optical signals received by a certain bundle of optical fibers may also have optical signals emitted by other bundles of optical fibers, thereby causing optical crosstalk in the optical transmission process.

Disclosure of Invention

In view of this, embodiments of the present invention provide an optical receiving assembly and an optical module to solve the optical crosstalk problem in the optical transmission process.

An embodiment of the present invention provides a light receiving module, including: the optical fiber array is used for receiving and transmitting light separated into a plurality of wavelengths, and comprises a plurality of optical fibers, and each optical fiber correspondingly transmits the light with one wavelength; the photoelectric detectors are arranged at intervals, each photoelectric detector is arranged in the extending direction of one optical fiber, and the photoelectric detectors correspond to the optical fibers one by one; the photoelectric detector is used for receiving light rays emitted by the corresponding optical fiber; and the light blocking piece is arranged between two adjacent photoelectric detectors so as to block light rays emitted by optical fibers which do not correspond to the photoelectric detectors from entering the photoelectric detectors.

Further, the extending direction of the plurality of optical fibers and the extending direction of the plurality of photodetectors are substantially the same, wherein the photodetectors are spaced from the corresponding optical fibers by a preset distance in the extending direction.

Further, the light receiving assembly further comprises a circuit board, and the optical fiber array, the photodetector and the light blocking member are all arranged on the circuit board.

Further, the light receiving assembly further comprises a light splitter, wherein the light splitter is adjacent to the optical fiber array and arranged on one side of the optical fiber array away from the photoelectric detector; the light splitter is used for splitting the light into light with a plurality of wavelengths.

Furthermore, the circuit board is also provided with a metal coating, and the photoelectric detector and the optical fiber array are attached to the metal coating.

Further, the metal plating layer includes a first metal plating layer and a second metal plating layer, the first metal plating layer is used for mounting the photodetector and the optical fiber array, and the second metal plating layer is used for arranging a lead wire connected with the photodetector.

Further, the circuit board is further characterized in that a Kovar heat sink is arranged on the circuit board, and the optical fiber array is placed on the Kovar heat sink.

Further, the photoelectric detector is characterized in that a fixing cushion block for bearing the photoelectric detector is further arranged on the circuit board, and the photoelectric detector is placed on the fixing cushion block.

The circuit board is further characterized in that the circuit board is further provided with an insulating cushion block used for bearing the fixing cushion block, one end face of the insulating cushion block is in contact with the circuit board, and the other end face of the insulating cushion block is in contact with the fixing cushion block.

An embodiment of the present invention further provides an optical module, including: a light emitting assembly for emitting light; the light receiving component receives the light emitted by the light emitting component.

The light receiving assembly provided by the embodiment of the invention comprises an optical fiber array, a plurality of photoelectric detectors and a light blocking piece. The optical fiber array is provided with a plurality of optical fibers, a plurality of photoelectric detectors are arranged at intervals, each photoelectric detector is arranged in the extending direction of one optical fiber, the photoelectric detectors correspond to the optical fibers one to one, and light blocking pieces are arranged between the adjacent photoelectric detectors. According to the embodiment of the invention, the light blocking piece is arranged between the adjacent photoelectric detectors, and by arranging the light blocking piece, light rays can be blocked by the light blocking piece after being transmitted out of the light ray channel, so that the light rays are prevented from entering the adjacent photoelectric detectors, therefore, optical crosstalk is avoided, and the isolation degree between optical fibers is improved. Optical fiber

Drawings

Fig. 1 is a front view of a light receiving module according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of an optical fiber array structure according to an embodiment of the present invention;

fig. 3 is a top view of a light receiving assembly according to an embodiment of the present invention;

FIG. 4a is a schematic diagram of a photo detector arrangement according to an embodiment of the present invention;

FIG. 4b is a schematic diagram of another photodetector arrangement according to an embodiment of the present invention;

fig. 5a is a schematic structural diagram of a light barrier according to an embodiment of the present invention;

FIG. 5b is a schematic structural diagram of another light blocking member according to an embodiment of the present invention;

FIG. 5c is a schematic structural diagram of another light blocking member according to an embodiment of the present invention;

FIG. 6 is a top view of another optical construction assembly provided in accordance with an embodiment of the present invention;

FIG. 7 is a top view of another optical construction assembly provided in accordance with an embodiment of the present invention;

FIG. 8 is a front view of another optical structure assembly provided by an embodiment of the present invention;

fig. 9 is a schematic structural diagram of an optical module according to an embodiment of the present invention.

Description of reference numerals:

1a, a light emitting component; 1b, a light receiving component; 10. an optical fiber array; 11. a substrate; 111. a groove; 12. an optical fiber; 13. pressing a plate; 20. a photodetector; 30. a light blocking member; 40. a circuit board; 41. a metal plating layer; 411. a first metal plating layer; 412. a second metal plating layer; 42. a Kovar heat sink; 43. fixing the cushion block; 44. insulating cushion blocks; 50. a light splitter.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Various combinations of the specific features in the embodiments described in the detailed description may be made without contradiction, for example, different embodiments may be formed by different combinations of the specific features, and various possible combinations of the specific features in the present invention will not be further described in order to avoid unnecessary repetition.

In the following description, the term "first \ second \ … …" is referred to merely to distinguish different objects and does not indicate that there is identity or relationship between the objects. It should be understood that the references to "upper", "lower" and "inner" are all intended to describe the orientation during normal use. The "up" and "down" directions are those indicated in the corresponding schematic drawings, and may or may not be those in a normal use state.

It is to be noted that the term "comprises," "comprising," or any other variation thereof is intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element. The term "coupled", where not otherwise specified, includes both direct and indirect connections.

The invention provides a light receiving component, which is a converter for converting a received optical signal into an electric signal, and is one of the components of a light receiver, a light converter, a photoelectric chip and the like. The light receiving module is generally enclosed in a housing, and the housing has a cavity structure inside, the light receiving module is fixed in the cavity structure, and the cavity structure is filled with high-purity nitrogen or other inert gases. Optionally, the material of the housing may be metal, ceramic, or glass. The inert gas is filled in the cavity structure of the shell, and the air in the cavity structure is exhausted, so that the light receiving assembly is prevented from being invaded or corroded by pollutants, and the use stability of the light receiving assembly is improved. In addition, the light receiving component can be packaged by a plastic shell, and the plastic shell is not provided with a cavity structure and directly wraps the light receiving component through plastic. It should be noted that, besides the housing is used for packaging, the light receiving module may be integrated with other components on a circuit board for use. The package refers to a series of processes such as mounting, fixing, sealing, and wire bonding, for example: the light receiving component is wrapped by the shell or is directly integrated on the circuit board in a welding mode.

The operating principle of the light receiving module is roughly as follows:

the light receiving module mainly includes a light transmitting portion and a photoelectric conversion portion, as shown in fig. 1, the light transmitting portion employs an optical fiber array 10, and the photoelectric conversion portion employs a photodetector 20. When light is transmitted to the light receiving component, the light firstly enters the optical fiber array 10 to continue transmission, the optical fiber array 10 is provided with a plurality of optical fibers, each optical fiber transmits light with one wavelength, the whole optical fiber array 10 can transmit light with the same wavelength, and can also transmit light with different wavelengths simultaneously, and regarding light with different wavelengths, light with different wavelengths enters the optical fiber array 10 and can independently transmit without mutual interference. The light can reach the photoelectric detector 20 after being transmitted along the optical fiber array 10, a photosensitive surface is arranged in the photoelectric detector 20, the light can be converged on the photosensitive surface of the photoelectric detector 20 after being transmitted through the optical fiber array 10, the photosensitive surface absorbs the transmitted light energy and then converts the light energy into electric energy, and the electric energy is transmitted out in an electric signal mode, so that the light signal is converted into an electric signal. When the light beams with different wavelengths are transmitted simultaneously, the plurality of photodetectors 20 are provided, and the light beams with different wavelengths are respectively converged onto the photosensitive surfaces of the photodetectors 20 corresponding to the photodetectors for performing photoelectric conversion.

An optical receiving assembly according to an embodiment of the present invention, as shown in fig. 1, includes an optical fiber array 10, a photodetector 20, and a light blocking member 30, where the optical fiber array 10 is configured to receive and transmit light separated into a plurality of wavelengths. It should be noted that the light beams split into multiple wavelengths are that the light beams before entering the optical fiber array 10 include multiple wavelengths instead of one wavelength, and the light beams are split into multiple wavelengths before entering the optical fiber array 10, where each light beam corresponds to one wavelength. The specific separation method may not be limited, and the light beam may be already separated into light beams with multiple wavelengths when being emitted, or the light beam may be an integral including multiple wavelengths when being emitted, and the light beam is separated before entering the optical fiber array. Specifically, as shown in fig. 2, the optical fiber array 10 mainly includes a substrate 11, optical fibers 12, and a pressing plate 13, where the substrate 11 is provided with a groove 111, the optical fibers 12 are placed in the groove 111, the optical fibers 12 are disposed through the groove 111, and the pressing plate 13 is pressed against the substrate 11, so as to fix the optical fibers 12 in the groove 111. The pressing plate 13 and the substrate 11 may be bonded together by an adhesive or fixed together by a fixing member. For example, the pressing plate 13 and the substrate 11 may be adhered together by glue, or the pressing plate 13 is provided with a snap structure, and the pressing plate 13 is fixed with the substrate 11 by the snap structure. Optionally, the groove 111 may be a V-shaped groove or a U-shaped groove. The optical fiber array 10 includes a plurality of optical fibers 12, each optical fiber 12 transmitting light of a wavelength. Specifically, the substrate 11 is provided with a plurality of grooves 111, each of the grooves 111 is provided with one optical fiber 12, and light beams with different wavelengths enter the corresponding optical fiber 12. Through setting up a plurality of optic fibre 12, realize that the light of different wavelength can transmit simultaneously, and the light of different wavelength also can not mutual interference at the in-process of transmission, has improved light transmission's validity. The optical fiber 12 may be a plurality of bare optical fiber wires, and optionally, the bare optical fiber wires may be set to be colorful, and the bare optical fiber wires of each color correspond to the optical fiber 12 for transmitting light of one wavelength, so as to distinguish the optical fiber 12 for transmitting light of different wavelengths. For example, the bare optical fiber has red, orange, yellow and green colors, the red bare optical fiber is used for transmitting light with a wavelength of 980nm, the orange bare optical fiber is used for transmitting light with a wavelength of 1310nm, the yellow bare optical fiber is used for transmitting light with a wavelength of 1490nm, and the green bare optical fiber is used for transmitting light with a wavelength of 1550 nm. Besides, the bare optical fiber wires with different colors can transmit light with fixed wavelength and can also transmit light with a certain range of wavelength, for example, the bare optical fiber wire with red color is used for transmitting light with the wavelength range of 930 nm-980 nm, the bare optical fiber wire with orange color is used for transmitting light with the wavelength range of 1270 nm-1310 nm, the bare optical fiber wire with yellow color is used for transmitting light with the wavelength range of 1430 nm-1490 nm, and the bare optical fiber wire with green color is used for transmitting light with the wavelength range of 1530 nm-1570 nm. The bare optical fibers of different colors are stuck in the groove 111 by an adhesive, thereby preventing the bare optical fibers from falling off the substrate 11. For example, the adhesive may be a potting adhesive. The bare optical fiber may be provided in various lengths, each corresponding to a different wavelength of the optical fiber 12. For example, the bare optical fiber may have a length of 10mm, 11mm, 12mm, 13mm, etc., wherein the bare optical fiber having a length of 10mm is used for transmitting light having a wavelength of 980nm, the bare optical fiber having a length of 11mm is used for transmitting light having a wavelength of 1310nm, the bare optical fiber having a length of 12mm is used for transmitting light having a wavelength of 1490nm, and the bare optical fiber having a length of 13mm is used for transmitting light having a wavelength of 1550 nm. In addition, the bare optical fibers with different lengths can be used for transmitting light with a certain wavelength range besides a certain fixed wavelength. For example, a bare optical fiber having a length of 10mm is used to transmit light having a wavelength ranging from 930nm to 980nm, a bare optical fiber having a length of 11mm is used to transmit light having a wavelength ranging from 1270nm to 1310nm, a bare optical fiber having a length of 12mm is used to transmit light having a wavelength ranging from 1430nm to 1490nm, and a bare optical fiber having a length of 13mm is used to transmit light having a wavelength ranging from 1530nm to 1570 nm.

As shown in fig. 3, there are a plurality of photodetectors 20, and the plurality of photodetectors 20 are arranged at intervals, specifically, the interval arrangement means that there is a certain distance between two components, that is, there is a certain distance, for example, 1mm or 2mm, between the plurality of photodetectors 20, and the arrangement is not continuous. The plurality of photodetectors 20 may be arranged in a straight line in the longitudinal direction (the vertical direction in the figure) as shown in fig. 4a, or in a step-like manner as shown in fig. 4 b. The photodetectors 20 are used for receiving the light in the optical fibers 12, and therefore, each of the photodetectors 20 is disposed in the extending direction of one of the optical fibers 12 and the photodetectors 20 correspond to the optical fibers 12 one by one. The extending direction is that each optical fiber 12 in the optical fiber array 10 can be basically regarded as a line segment, and the extending direction of the optical fiber 12 is the direction of the line segment; i.e. the direction along the one end of the optical fibre 12 in which light enters the fibre from one end and then exits from the other end of the fibre 12. By one-to-one correspondence, one optical fiber 12 corresponds to one photodetector 20, that is, the number of optical fibers 12 is the same as the number of photodetectors 20, light transmitted in each optical fiber 12 enters one photodetector 20, and light transmitted in different optical fibers 12 enters different photodetectors 20. Specifically, the light array 10 has a plurality of optical fibers 12, each optical fiber 12 can transmit light with different wavelengths, and the photodetectors 20 respond differently to different wavelengths, so as to convert the received light into electrical signals as much as possible, the photodetectors 20 responding better to the light with different wavelengths are adopted, that is, the light with different wavelengths corresponds to different photodetectors 20. The photodetectors 20 are configured to receive light emitted from corresponding optical fibers 12, specifically, light in different optical fibers 12 has different wavelengths, and the light is absorbed by the corresponding photodetectors 20 after being transmitted through the optical fibers 12.

As shown in fig. 3, the light blocking member 30 is disposed between two adjacent photodetectors to block light emitted from the optical fiber 12 not corresponding to the photodetector 20 from entering the photodetector 20. Specifically, the light receiving module has a small overall size and a compact structure, and cannot provide enough space for each of the photodetectors 20 to prevent other light from entering the photodetector 20, and therefore, the light blocking member 30 is disposed between adjacent photodetectors 20 to prevent light from entering the photodetectors 20 that do not correspond to each other. As shown in fig. 5a, the light-blocking member 30 may be a flat light-blocking plate, and after the light is transmitted out of the optical fiber 12, the light is totally reflected to the corresponding photodetector by the reflection action of the plate surface of the light-blocking plate. In addition, as shown in fig. 5b, the light barrier 30 may also be an L-shaped light barrier, and the light barrier of the U-shaped structure is formed by combining the L-shaped light barriers between adjacent photodetectors 20, so as to wrap the photodetectors 20 in the U-shaped structure. In addition, as shown in fig. 5c, the light blocking member 30 may also be a T-shaped light blocking plate, and a rectangular structure is formed by the positive and negative arrangement of the T-shaped light blocking plate between the adjacent photodetectors 20, and the light blocking plate forms four faces of the rectangular structure to wrap the photodetectors 20 therein, so that light is completely blocked by the light blocking member 30. In order to further improve the light blocking capability of the light blocking member 30, a reflective film may be additionally disposed on the light blocking member 30 to reduce the light transmitted by the light blocking member 30, for example, a reflective film made of Au or Ti may be plated on the surface of the light blocking member 30.

The light receiving assembly provided by the embodiment of the invention comprises an optical fiber array, a plurality of photoelectric detectors and a light blocking piece. The optical fiber array is provided with a plurality of optical fibers, a plurality of photoelectric detectors are arranged at intervals, each photoelectric detector is arranged in the extending direction of one optical fiber, the photoelectric detectors correspond to the optical fibers one to one, and light blocking pieces are arranged between the adjacent photoelectric detectors. According to the embodiment of the invention, the light blocking piece is arranged between the adjacent photoelectric detectors, and by arranging the light blocking piece, light rays can be blocked by the light blocking piece after being transmitted out of the light ray channel, so that the light rays are prevented from entering the adjacent photoelectric detectors, therefore, optical crosstalk is avoided, and the isolation degree between optical fibers is improved.

In some embodiments, as shown in fig. 3, the extending direction of the plurality of optical fibers and the extending direction of the plurality of photodetectors are substantially the same, wherein the photodetectors are spaced from the corresponding optical fibers by a predetermined distance in the extending direction. It should be noted that each optical fiber 12 in the optical fiber array 10 can be regarded as a line segment, and the extending direction of the optical fiber 12 is the direction of the line segment; the extending direction of the photodetector 20 can be understood as the length direction thereof. The extending direction of the photodetector 20 coincides with the extending direction of the optical fiber 12, so that the arrangement of the photodetector 20 and the optical fiber 12 is neat and compact, and as many optical fibers 12 and photodetectors 20 as possible can be provided on a limited area. Specifically, the light array 10 and the photodetector 20 are not connected together, but are disposed at a distance. For example, the distance between the optical fiber 12 and the photodetector 20 may be 0.5mm, 1mm, or the like. The light enters the optical fiber 12 from one end of the optical fiber 12, and is transmitted out of the optical fiber 12 from the other end after being transmitted along the optical fiber 12, the end of the optical fiber 12 from which the light is transmitted may be set to be an inclined plane with a certain angle, which may be 42.5 ° or 45 °, for example, the end of the optical fiber 12 is an inclined plane with an inclination angle of 42.5 °. The light is reflected by the inclined surface onto the photosensitive surface of the photodetector 20 as it exits the optical fiber 12, thereby completing the light absorption process. The optical fiber is reflected by the inclined plane of the optical fiber 12, light rays are concentrated on the photosensitive surface, light scattering consumption is avoided, and photoelectric conversion rate is improved.

In some embodiments, as shown in fig. 3, the light receiving assembly further includes a circuit board 40, and the optical fiber array 10, the photodetector 20, and the light blocking member 30 are all disposed on the circuit board 40. Specifically, in use, the distance between the optical fiber array 10 and the photo detector 20 and the light blocking member 30 is fixed, and in order to avoid the position shift among the optical fiber array 10, the photo detector 20 and the light blocking member 30 in use, the optical fiber array 10, the photo detector 20 and the light blocking member 30 can be fixed on the circuit board. The optical fiber array 10 and the photodetector 20 are provided with pins, and the optical fiber array 10 and the photodetector 20 can be directly soldered to the circuit board 40 by means of soldering. The flag 30 may be directly affixed to the circuit board 40 by an adhesive, such as glue. Alternatively, the optical fiber array 10, the photodetector 20, and the flag 30 may be directly attached to the circuit board 40 by glue. The circuit board 40 may be a rigid printed circuit board or a flexible circuit board. In addition, the photodetector 20 can transmit the signal converted from the absorbed light energy through an electrical connection with the circuit board. The optical fiber array 10, the photoelectric detector 20 and the light blocking member 30 are fixed on the circuit board, so that the distance between the optical fiber array 10 and the photoelectric detector can be limited, and the photoelectric conversion rate is prevented from being influenced by looseness in the use process.

In some embodiments, as shown in fig. 6, the light receiving assembly further includes a beam splitter 50, the beam splitter 50 being adjacent to the optical fiber array 10 and disposed on a side of the optical fiber array 10 away from the photodetector 20; the beam splitter 50 is used to split the light into multiple wavelengths of light. Specifically, before being transmitted to the light receiving assembly, the light rays are not transmitted respectively according to the light rays with different wavelengths, but the light rays with the different wavelengths are combined into one or more light beams to be transmitted, and after entering the light receiving assembly, the light rays need to be separated and then transmitted separately. The optical splitter 50 is configured to split received light into light having different wavelengths, and transmit the light having different wavelengths to the corresponding optical fibers 12. Therefore, the optical splitter 50 is disposed at the end of the optical fiber array 10 where light enters, so that the light received by the light receiving component first passes through the optical splitter 50 and then enters the corresponding optical fiber array 10 for transmission. By providing the optical splitter 50, light entering the light receiving module is separated into different wavelengths and transmitted, which facilitates subsequent photoelectric conversion.

In some embodiments, as shown in fig. 6, the circuit board 40 is further provided with a metal plating 41, and the photodetector 20 and the optical fiber array 10 are attached to the metal plating 41. Specifically, the metal plating layer 41 is disposed on the surface of the circuit board 40, and the material of the metal plating layer 41 may be zinc, copper, gold, or other metal material. The photo detector 20 and the optical fiber array 10 are directly mounted on the circuit board 40, and there may occur a case where instability occurs or the circuit board 40 is damaged during the mounting process. In order to facilitate the arrangement of the optical fiber array 10 and the photodetector 20, the circuit board 40 is protected, and a metal coating is disposed on the circuit board 40 by electroplating or other methods, so as to improve the wear resistance and corrosion resistance of the circuit board 40.

In some embodiments, as shown in fig. 7, the metal plating 41 includes a first metal plating 411 and a second metal plating 412, the first metal plating 411 is used for mounting the photodetector 20 and the optical fiber array 10, and the second metal plating 412 is used for providing a lead wire for connecting the photodetector 20. Specifically, the first metal plating layer 411 and the second metal plating layer 412 are disposed side by side on the circuit board 40, and a certain distance may be set between the first metal plating layer 411 and the second metal plating layer 412, or they may be disposed in a manner of being adjacent to each other. The optical fiber array 10 and the photodetector 20 are attached to the first metal plating layer 411, for example, the optical fiber array 10 and the photodetector 20 are provided with pins and directly soldered on the first metal plating layer 411 by soldering. Be equipped with the wire in the second metal coating, the wire is as an organic whole through the mode of pressure welding and second metal coating welding, and photoelectric detector 20 is connected to the one end of wire, and other components and parts can be connected to the other end to make things convenient for photoelectric detector 20 to go out the signal of telecommunication of light energy conversion. The shapes of the first metal plating layer 411 and the second metal plating layer 412 may be square, rectangular or other unspecified shapes, and the specific shapes and sizes thereof may be set according to the shapes and sizes of the photodetector 20 and the optical fiber array 10. By dividing the metal coating into the first metal coating and the second metal coating, the length of the connecting lead is shortened, and the loss in the process of electric signal transmission is reduced.

In some embodiments, as shown in FIG. 8, the circuit board 40 is also provided with a Kovar heat sink 42, on which the optical fiber array 10 is placed 42. Specifically, the kovar heat sink 42 is an alloy material whose temperature does not change with the amount of heat energy transferred thereto, and light rays generate a certain amount of heat energy when being transmitted in the optical fiber array 10, and if not removed in time, the optical fiber array 10 is damaged. Alternatively, the fiber array 10 may rest directly on the Kovar heat sink 42 or may be bonded directly to the Kovar heat sink by an adhesive, such as glue. By providing the kovar heat sink 42, the temperature uniformity of the fiber array 10 may be improved, facilitating heat dissipation of the fiber array.

In some embodiments, as shown in fig. 8, a fixing pad 43 for carrying the photo chip is further disposed on the circuit board 40, and the photo detector 20 is disposed on the fixing pad 43. Specifically, the photodetector 20 is placed on the fixing pad 43, for example, the photodetector 20 may be embedded in the fixing pad. The fixed cushion block can be a cushion block made of a metal material, and the photoelectric detector 20 is prevented from being directly clamped when the position is adjusted by arranging the photoelectric detector 20 on the fixed cushion block 43, so that the photoelectric detector 20 is prevented from being damaged when the position of the photoelectric detector 20 is conveniently adjusted.

In some embodiments, as shown in fig. 8, the circuit board 40 is further provided with an insulating pad 44 for carrying the fixing pad 43, one end surface of the insulating pad 44 is in contact with the circuit board 40, and the other end surface of the insulating pad 44 is in contact with the fixing pad 43. Specifically, the insulating pad 44 is disposed on the circuit board 40, and a fixing pad 43 is disposed on an end surface opposite to an end surface of the insulating pad 44 contacting the circuit board 40, and the insulating pad 44 supports the fixing pad 43. In addition, the insulating pad 44 is arranged between the circuit board 40 and the fixing pad 43, so that the photoelectric detector 20 and the circuit board 40 are electrically isolated, meanwhile, the insulating and conducting have a certain heat dissipation effect, and heat generated by the photoelectric detector 20 during operation is transferred to the insulating pad 44 through the fixing pad 43 for heat dissipation.

An embodiment of the present invention further provides an optical module, as shown in fig. 9, including: a light emitting module 1a for emitting an optical fiber and a light receiving module 1b according to any of the above embodiments, the light receiving module 1b receiving the light emitted from the light emitting module 1 a. Specifically, the light emitting module 1a includes a combiner, light with different wavelengths is combined into one or more beams of light through the combiner for transmission, and the number of light with different wavelengths is determined according to the corresponding light receiving module 1b, for example, if the optical fiber array 10 of the light receiving module 1b only has 8 optical fibers 12, when the light emitting module 1a performs combining, only 8 light with different wavelengths can be combined, so that the number of light separated by the optical splitter 50 after the light is transmitted to the light receiving module 1b is also 8. In addition, after the light receiving module 1b converts the received light into an electrical signal, the electrical signal is modulated to increase the transmission rate of the electrical signal, for example, if the PAM4 technique is used for modulation, the transmission rate can be doubled, so that the communication capacity can be increased without changing the optical fiber 12.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.