CN115542471A - Optical module - Google Patents

Abstract

The application provides an optical module, which comprises a circuit board and an optical receiving submodule, wherein the optical receiving submodule comprises a tube seat, a tube cap, a supporting plate, a filter, a reflector bracket and a reflector, and at least two optical receiving chips are arranged on the tube seat; the pipe cap cover is arranged on the pipe seat, and the side surface of the pipe cap cover, which is back to the pipe seat, is obliquely arranged relative to the pipe seat; the supporting plate is embedded in the pipe cap and is obliquely arranged relative to the pipe seat; the filter is arranged on the support plate and used for transmitting the light beam with the first preset wavelength, transmitting the transmitted light beam to a light receiving chip and reflecting the light beam with the second preset wavelength; the reflector plate support is arranged on the supporting plate, and the reflector plate is arranged on the reflector plate support and used for reflecting the light beam reflected by the filter plate and emitting the light beam reflected by the reflector plate to the other light receiving chip. This application has realized the separation of a plurality of different wavelength lights through filter plate, reflector plate, and a plurality of light receiving chip receive the light after the separation respectively, have reduced the overall dimension of light receiving submodule piece, are favorable to the miniaturized demand of optical module.

Description

Optical module

Technical Field

The application relates to the technical field of optical fiber communication, in particular to an optical module.

Background

In the optical communication technology, an optical module is a tool for realizing the interconversion of optical signals, is one of key devices in optical communication equipment, and the transmission rate of the optical module is continuously increased along with the development of the optical communication technology. In a high-speed information transceiving system, a high-density optical module is required to replace a conventional optical module, and a multi-channel optical transceiving technology is adopted, so that more transmitters and more receivers can be concentrated in a smaller space. In such a high-speed transceiver module, a core component thereof is a BOSA (Bi-Directional Optical Sub-Assembly) structure in an Optical module.

The commonly used BOSA structure generally comprises a light emission TO, a filter, a light receiving TO and an optical fiber adapter, wherein light beams emitted by the light emission TO directly penetrate through the filter TO be transmitted TO the optical fiber adapter, the light beams input by the optical fiber adapter are subjected TO light splitting reflection at the filter, and the reflected light is transmitted TO the light receiving TO. For an optical module using multiple optical receiving channels, multiple optical filters and multiple optical receiving TOs need TO be arranged TO receive multiple light beams with different wavelengths.

However, since the optical module having a plurality of optical receiving channels needs TO have a plurality of optical receiving TOs, the overall size of the BOSA is large, and thus the overall size of the optical module is increased, which limits the demand for further miniaturization.

Disclosure of Invention

The embodiment of the application provides an optical module to solve the problem that the whole size of the existing optical module with a plurality of light receiving channels is large, and the requirement for further miniaturization is limited.

The application provides an optical module, includes:

a circuit board;

the light receiving secondary module is electrically connected with the circuit board and used for receiving light signals;

wherein the optical receive sub-module comprises:

a stem on which at least two light receiving chips are disposed;

the pipe cap is covered on the pipe seat, an opening is formed in the side surface of the pipe cap, which is back to the pipe seat, and the side surface where the opening is located is obliquely arranged relative to the pipe seat;

the supporting plate is embedded in the pipe cap and is obliquely arranged relative to the pipe seat;

the filter is arranged on the support plate and used for transmitting a light beam with a first preset wavelength, and the light beam penetrating through the filter is emitted to the light receiving chip; and reflecting the light beam with the second preset wavelength;

the reflector plate bracket is arranged on the supporting plate;

and the reflector plate is arranged on the reflector plate bracket and used for reflecting the light beam reflected by the filter plate, and the light beam reflected by the reflector plate is emitted to the other light receiving chip.

The optical module comprises a circuit board and an optical receiving submodule, wherein the optical receiving submodule is electrically connected with the circuit board and used for receiving optical signals; the light receiving sub-module comprises a tube seat, a tube cap, a supporting plate, a filter, a reflector bracket and a reflector, wherein at least two light receiving chips are arranged on the tube seat, and comprise a plurality of light with different wavelengths which are emitted into the light receiving TO assembly 402 through the optical fiber adapter and are respectively emitted into different light receiving chips after wavelength screening; the pipe cap cover is arranged on the pipe seat, the side surface of the pipe cap cover, which is back to the pipe seat, is provided with an opening, and the side surface of the opening is obliquely arranged relative to the pipe seat, namely the pipe cap is an oblique window pipe cap; the supporting plate is embedded in the pipe cap, is obliquely arranged relative to the pipe seat and is used for supporting and fixing the filter and the reflector bracket; the filter is arranged on the support plate and used for transmitting the light beam with the first preset wavelength, transmitting the light beam through the filter to a light receiving chip and reflecting the light beam with the second preset wavelength; the reflector plate support is arranged on the supporting plate, and the reflector plate is arranged on the reflector plate support and used for reflecting the light beam reflected by the filter plate and emitting the light beam reflected by the reflector plate to the other light receiving chip. The optical transceiver sub-module transmits light containing a plurality of different wavelengths to the receiving sub-module, the receiving sub-module can realize the separation of light beams with different wavelengths through the filter plate and the reflector plate, the plurality of light receiving chips respectively detect the separated light beams, and compared with the plurality of receiving sub-modules, one receiving sub-module can reduce the overall size of the optical transceiver sub-module, so that the miniaturization requirement of an optical module is facilitated; in addition, the optical transceiving submodule with the plurality of optical receiving channels only comprises one receiving submodule, so that the coupling is only needed once during production, and the production efficiency can be improved.

Drawings

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

Fig. 1 is a schematic diagram of a connection relationship of an optical communication terminal;

FIG. 2 is a schematic diagram of an optical network unit;

fig. 3 is a schematic structural diagram of an optical module according to an embodiment of the present disclosure;

fig. 4 is an exploded structural diagram of an optical module according to an embodiment of the present disclosure;

fig. 5 is a schematic structural diagram of a light receiving module in an optical module according to an embodiment of the present disclosure;

fig. 6 is an exploded schematic structural diagram of a light receiving module in an optical module according to an embodiment of the present disclosure;

fig. 7 is a schematic partial exploded view of a light receiving module in an optical module according to an embodiment of the present disclosure;

fig. 8 is a schematic structural diagram of a tube cap in a light receiving module in an optical module according to an embodiment of the present disclosure;

FIG. 9 is a schematic diagram illustrating a filter holder in a light receiving module according to an embodiment of the present disclosure;

fig. 10 is a cross-sectional view of a light receiving assembly in a light module according to an embodiment of the present application;

fig. 11 is a schematic diagram of a receiving optical path of an optical module according to an embodiment of the present application;

fig. 12 is a schematic diagram of a transmitting/receiving optical path of an optical module according to an embodiment of the present application.

Detailed Description

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, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

One of the core links of optical fiber communication is the interconversion of optical and electrical signals. The optical fiber communication uses optical signals carrying information to transmit in information transmission equipment such as optical fibers/optical waveguides, and the information transmission with low cost and low loss can be realized by using the passive transmission characteristic of light in the optical fibers/optical waveguides; meanwhile, the information processing device such as a computer uses an electric signal, and in order to establish information connection between the information transmission device such as an optical fiber or an optical waveguide and the information processing device such as a computer, it is necessary to perform interconversion between the electric signal and the optical signal.

The optical module realizes the function of interconversion of optical signals and electrical signals in the technical field of optical fiber communication, and the interconversion of the optical signals and the electrical signals is the core function of the optical module. The optical module is electrically connected with an external upper computer through a golden finger on an internal circuit board of the optical module, and the main electrical connection comprises power supply, I2C signals, data signals, grounding and the like; the electrical connection mode realized by the gold finger has become the mainstream connection mode of the optical module industry, and on the basis of the mainstream connection mode, the definition of the pin on the gold finger forms various industry protocols/specifications.

Fig. 1 is a schematic diagram of connection relationship of an optical communication terminal. As shown in fig. 1, the connection of the optical communication terminal mainly includes the interconnection among the optical network terminal 100, the optical module 200, the optical fiber 101 and the network cable 103;

one end of the optical fiber 101 is connected with a remote server, one end of the network cable 103 is connected with a local information processing device, and the connection between the local information processing device and the remote server is completed by the connection between the optical fiber 101 and the network cable 103; and the connection between the optical fiber 101 and the network cable 103 is made by the optical network terminal 100 having the optical module 200.

An optical port of the optical module 200 is externally accessed to the optical fiber 101, and establishes bidirectional optical signal connection with the optical fiber 101; an electrical port of the optical module 200 is externally connected to the optical network terminal 100, and establishes bidirectional electrical signal connection with the optical network terminal 100; the optical module realizes the interconversion of optical signals and electric signals, thereby realizing the establishment of information connection between the optical fiber and the optical network terminal; specifically, the optical signal from the optical fiber is converted into an electrical signal by the optical module and then input to the optical network terminal 100, and the electrical signal from the optical network terminal 100 is converted into an optical signal by the optical module and input to the optical fiber.

The optical network terminal is provided with an optical module interface 102, which is used for accessing an optical module 200 and establishing bidirectional electric signal connection with the optical module 200; the optical network terminal is provided with a network cable interface 104, which is used for accessing the network cable 103 and establishing bidirectional electric signal connection with the network cable 103; the optical module 200 is connected to the network cable 103 through the optical network terminal 100, specifically, the optical network terminal transmits a signal from the optical module to the network cable and transmits the signal from the network cable to the optical module, and the optical network terminal serves as an upper computer of the optical module to monitor the operation of the optical module.

At this point, a bidirectional signal transmission channel is established between the remote server and the local information processing device through the optical fiber, the optical module, the optical network terminal and the network cable.

Common information processing apparatuses include routers, switches, electronic computers, and the like; the optical network terminal is an upper computer of the optical module, provides data signals for the optical module, and receives the data signals from the optical module, and the common upper computer of the optical module also comprises an optical line terminal and the like.

Fig. 2 is a schematic diagram of an optical network terminal structure. As shown in fig. 2, the optical network terminal 100 has a circuit board 105, and a cage 106 is disposed on a surface of the circuit board 105; an electric connector is arranged in the cage 106 and used for connecting optical module electric ports such as golden fingers; the cage 106 is provided with a heat sink 107, and the heat sink 107 has a projection such as a fin that increases a heat radiation area.

The optical module 200 is inserted into the onu, specifically, the electrical port of the optical module is inserted into the electrical connector inside the cage 106, and the optical port of the optical module is connected to the optical fiber 101.

The cage 106 is positioned on the circuit board, and the electrical connector on the circuit board is wrapped in the cage, so that the electrical connector is arranged in the cage; the optical module is inserted into the cage, held by the cage, and the heat generated by the optical module is conducted to the cage 106 and then diffused by the heat sink 107 on the cage.

Fig. 3 is a schematic view of an optical module according to an embodiment of the present disclosure, and fig. 4 is a schematic view of an exploded structure of an optical module according to an embodiment of the present disclosure. As shown in fig. 3 and 4, an optical module 200 provided in the embodiment of the present application includes an upper housing 201, a lower housing 202, an unlocking component 203, a circuit board 300, an optical transceiver sub-module 400, and an optical fiber adapter.

The upper shell 201 is covered on the lower shell 202 to form a wrapping cavity with two openings; the outer contour of the wrapping cavity is generally a square body, and specifically, the lower shell comprises a main plate and two side plates which are positioned at two sides of the main plate and are perpendicular to the main plate; the upper shell comprises a third shell, and the third shell covers the two side plates of the upper shell to form a wrapping cavity; the upper shell can also comprise two side walls which are positioned on two sides of the third shell and are perpendicular to the third shell, and the two side walls are combined with the two side plates to cover the upper shell on the lower shell.

The two openings can be two ends (204, 205) in the same direction, or two openings in different directions; one opening is an electric port 204, and a gold finger of the circuit board extends out of the electric port 204 and is inserted into an upper computer such as an optical network terminal; the other opening is an optical port 205 for external optical fiber access to connect with the optical transceiver sub-assembly 400 inside the optical module; the circuit board 300, the optical transceiver sub-assembly 400, the optical fiber adapter and other optoelectronic devices are located in the packaging cavity.

The assembly mode of combining the upper shell and the lower shell is adopted, so that the circuit board 300, the optical transceiver sub-module 400, the optical fiber adapter and other devices can be conveniently installed in the shell, and the outermost packaging protection shell of the optical module is formed by the upper shell and the lower shell; the upper shell and the lower shell are made of metal materials generally, so that electromagnetic shielding and heat dissipation are facilitated; generally, the housing of the optical module is not made into an integrated component, so that when devices such as a circuit board and the like are assembled, the positioning component, the heat dissipation component and the electromagnetic shielding component cannot be installed, and the production automation is not facilitated.

The circuit board 300 has a power supply circuit and a signal circuit for power supply and signal electrical connection. The optical fiber adapter includes an optical interface, which is disposed at the optical port 205 of the optical module 200 and is used for receiving the optical signal converted from the electrical signal from the circuit board 300 and transmitting the optical signal, which is converted into the electrical signal and transmitted to the circuit board 300. The one end of light interface is equipped with light mouthful stopper, and light mouthful stopper is connected with the light interface embedding for when the optical module does not use, play sealed effect, avoid exposing for a long time and receive dust pollution. The smooth mouth stopper can adopt the rubber material, has the flexibility, can play fine sealed effect.

The unlocking component 203 is located on the outer wall of the wrapping cavity/lower shell 202, and is used for realizing the fixed connection between the optical module and the upper computer or releasing the fixed connection between the optical module and the upper computer.

The unlocking component 203 is provided with a clamping component matched with the upper computer cage; the end of the unlocking component can be pulled to enable the unlocking component to move relatively on the surface of the outer wall; the optical module is inserted into a cage of the upper computer, and the optical module is fixed in the cage of the upper computer by a clamping component of the unlocking component; by pulling the unlocking component, the clamping component of the unlocking component moves along with the unlocking component, so that the connection relation between the clamping component and the upper computer is changed, the clamping relation between the optical module and the upper computer is released, and the optical module can be drawn out from the cage of the upper computer.

The circuit board 300 is provided with circuit traces, electronic components (such as capacitors, resistors, triodes, and MOS transistors), and chips (such as an MCU, a laser driver chip, a limiting amplifier chip, a clock data recovery CDR, a power management chip, and a data processing chip DSP).

The circuit board connects the electrical appliances in the optical module together according to the circuit design through circuit wiring to realize the functions of power supply, electrical signal transmission, grounding and the like.

The circuit board is generally a hard circuit board, and the hard circuit board can also realize a bearing effect due to the relatively hard material of the hard circuit board, for example, the hard circuit board can stably bear a chip; when the optical transceiver is positioned on the circuit board, the rigid circuit board can also provide stable bearing; the hard circuit board can also be inserted into an electric connector in the upper computer cage, and specifically, a metal pin/golden finger is formed on the surface of the tail end of one side of the hard circuit board and is used for being connected with the electric connector; these are not easily implemented with flexible circuit boards.

A flexible circuit board is also used in a part of the optical module to supplement a rigid circuit board; the flexible circuit board is generally used in combination with a rigid circuit board, for example, the rigid circuit board may be connected to the optical transceiver device through the flexible circuit board.

In the existing TO-CAN packaged product, the optical transceiver sub-module 400 includes a transmitter sub-module and an optical receiver sub-module, where a cap lens and a detector PD are main optical devices, and light beams from the outside are transmitted TO the optical receiver sub-module through an optical fiber adapter and converged TO the detector through the cap lens. A single rosa requires only a single signal wavelength, e.g., 1270nm.

In the COMOB PON BOSA, two lights with different wavelengths, for example, 1270/1310nm two lights, the optical subassembly 400 includes a filter 1, a filter 2, an optical subassembly 1 and an optical subassembly 2, the 1270/1310nm two lights enter from the optical fiber adapter, the 1270nm light beam is reflected at the filter 1, and the reflected light beam enters the optical subassembly 1; the 1310nm light beam passes through the filter 1, is reflected at the filter 2, and the reflected light beam enters the light receiving submodule 2.

However, the optical transceiver sub-assembly 400 includes the optical transmitter sub-assembly and two optical receiver sub-assemblies, which results in a larger overall size of the optical transceiver sub-assembly 400, and limits the requirement of further miniaturization. In order to solve the problem, the two light receiving sub-modules are combined into one light receiving sub-module, the two light receiving sub-modules are used for detecting the light receiving with two beams of different wavelengths respectively, the overall size of the light receiving and transmitting sub-module is reduced, and the requirement for miniaturization is met.

Fig. 5 is a schematic structural diagram of a lens assembly in an optical module provided in the embodiment of the present application. As shown in fig. 5, in the optical module provided in the embodiment of the present application, the optical receive sub-module includes a light receive TO assembly 402, where the light receive TO assembly 402 includes a cap 410, a socket 420, and a pin 430, where the socket 420 is provided with at least two light receive chips, and light with a plurality of different wavelengths enters the light receive TO assembly 402 through the optical fiber adapter, and then enters different light receive chips through wavelength screening; the cap 410 is covered on the socket 420, and one end of the pin 430 penetrates the socket 420 to be electrically connected with the optical chip on the socket 420, and the other end is electrically connected with the circuit board 300.

The side of the cap 410 facing away from the socket 420 is inclined with respect to the socket 420, that is, the side of the cap 410 facing away from the socket 420 is an inclined surface, and the light beam input by the optical fiber adapter can be emitted to the light receiving chip on the socket 420 through the inclined surface of the cap 410. Light reception TO subassembly 402 still includes filter 440 and reflector plate 450, and filter 440 sets up on the inclined plane of tube cap 410, and filter 440 inclines TO set up promptly, and the light beam of fiber adapter output is penetrated TO light reception TO subassembly 402 time, and the input angle of light beam is the acute angle, so the light beam penetrate can not be perpendicular penetrate TO filter 440 on, when the light beam takes place the reflection at filter 440, just also can not return according TO former way, also can make the light beam of a plurality of different wavelength penetrate TO the light receiving chip on tube socket 420 from this. The reflective plate 450 is disposed above the filter 440, and the light beam reflected by the filter 440 is incident on the reflective plate 450 and reflected again to the light receiving chip on the stem 420 at the reflective plate 450.

TO facilitate fixing of the reflection sheet 450, the light receiving TO module 402 further includes a reflection sheet support 460, the reflection sheet support 460 is disposed on the inclined surface of the cap 410, and the reflection sheet 450 is disposed on the reflection sheet support 460, that is, the reflection sheet support 460 is disposed obliquely, so that the reflection sheet 450 disposed on the reflection sheet support 460 is disposed at an angle TO the filter 440, thereby allowing the light beam reflected by the filter 440 TO be reflected again at the reflection sheet 450.

Fig. 6 is a schematic exploded view of a lens assembly in an optical module according to an embodiment of the present application, and fig. 7 is a schematic partially exploded view of the lens assembly in the optical module according to the embodiment of the present application. As shown in fig. 6 and 7, the light receiving TO package 402 further includes a support plate 470, the support plate 470 is embedded in the cap 410, and the support plate 470 is obliquely disposed with respect TO the socket 420, that is, the support plate 470 is obliquely embedded in the cap 410.

When the support plate 470 is inserted into the cap 410 in an inclined manner, the outer surface of the support plate 470 abuts against the inner surface of the cap 410, thereby fixing the support plate 470 in the cap 410. The side of the cap 410 facing away from the socket 420 is provided with an opening so that the light beam incident into the light receiving TO assembly 402 is sequentially emitted TO the light receiving chip on the socket 420 through the opening of the cap 410 and the support plate 470.

Fig. 8 is a schematic structural diagram of a tube cap in an optical module provided in the embodiment of the present application. As shown in fig. 8, the tube cap 410 includes a tube cap body 4110, a first opening 4120 is disposed on a side of the tube cap body 4110 facing away from the tube seat 420, a second opening 4130 is disposed on a side facing the tube seat 420, and the tube cap body 4110 is communicated with the outside through the first opening 4120 and the second opening 4130. When the cap 410 is covered on the socket 420, the side surface of the second opening 4130 abuts against the upper surface of the socket 420, for example, the side surface of the second opening 4130 may be adhered and fixed to the upper surface of the socket 420 by glue. At this time, the optical device such as the light receiving chip provided on the stem 420 is fitted into the inner cavity of the cap 410 through the second opening 4130.

In the embodiment of the present application, in order to facilitate the light beam transmitted through the first opening 4120 of the cap 410 to be emitted to the light receiving chip through the supporting plate 470, the supporting plate 470 is made of plane glass, and the plane glass is parallel to the side surface of the cap 410 where the opening is located, so that the light beam directly passes through the plane glass, and the light beam is not reflected on the side surface of the plane glass, thereby avoiding the loss of the light beam at the plane glass.

In order to facilitate detection of a plurality of light beams with different wavelengths from the outside, the upper surface of the stem 420 is provided with a first light receiving chip 4220 and a second light receiving chip 4240, and the first light receiving chip 4220 and the second light receiving chip 4240 are electrically connected to the pins 430 through gold wires to drive the first light receiving chip 4220 and the second light receiving chip 4240 to receive light beams with different wavelengths respectively.

When the filter 440 is disposed on the inclined surface of the cap 410, since the first opening 4120 is disposed on the inclined surface of the cap 410, the filter 440 is fixed on the supporting plate 470 through the first opening 4120, that is, the bottom surface of the filter 440 may be adhered to the supporting plate 470 by glue, so that the filter 440 is disposed in an inclined manner with respect to the socket 420.

When the filter 440 is adhered to the supporting plate 470, the filter 440 needs to be fixed right above the first light receiving chip 4220 on the tube seat 420, and thus when the light beams with different wavelengths are emitted to the filter 440, the light beam with the first preset wavelength (e.g., 1270 nm) can directly penetrate through the filter 440, and the light beam penetrating through the filter 440 can directly irradiate to the first light receiving chip 4220, so as to receive the light beam with 1270nm.

In the embodiment of the present application, when the filter 440 is fixed to the support plate 470, one end of the filter 440 is abutted to one end of the first opening 4120 of the cap 410, so as to limit the filter 440, thereby ensuring that the filter 440 is fixed directly above the first light receiving chip 4220.

Fig. 9 is a schematic structural diagram of a reflector bracket in an optical module according to an embodiment of the present application. As shown in fig. 9, the reflector plate 450 is fixed on the upper left of the filter plate 440 through the reflector plate support 460, in order to fix the reflector plate 450 conveniently, the reflector plate support 460 includes a first support plate 4610, a second support plate 4620 and a third support plate 4630, the first support plate 4610 and the second support plate 4620 are respectively connected to the third support plate 4630, a gap exists between the first support plate 4610 and the second support plate 4620, and one end of the reflector plate 450 is disposed on the first support plate 4610 and the other end is disposed on the second support plate 4620. After the reflector plate 450 is fixed to the reflector plate holder 460, the light beam reflected by the reflector plate 450 may be emitted into the cap 410 through the gap between the first support plate 4610 and the second support plate 4620.

To facilitate the placement of the reflective sheet 450, a first side 4640 of the first support plate 4610 facing away from the tube holder 420 is flush with a second side 4650 of the second support plate 4620 facing away from the tube holder 420, a third side 4660 of the third support plate 4630 facing away from the tube holder 420 protrudes from the first side 4640 and the second side 4650, a first side 4640 and a fourth side 4670 are disposed on the protruding portion of the third support plate 4630, and two ends of the fourth side 4670 are connected to the first side 4640 and the third side 4660, respectively. When the reflector 450 is placed on the reflector holder 460, the bottom surface of the reflector 450 contacts the first side 4640 and the second side 4650, and the side surface of the reflector 450 contacts the fourth side 4670, so that the reflector 450 is limited and fixed by the fourth side 4670.

In the embodiment of the present application, the bottom surface of the reflector holder 460 facing the socket 420 and the top surface of the reflector holder 460 facing away from the socket 420 may be both flat surfaces, and when the bottom surface of the reflector holder 460 is fixed to the support plate 470, the reflector holder 460 and the support plate 470 are disposed at a predetermined angle, that is, the bottom surface of the reflector holder 460 is adhered to the support plate 470, and the top surface of the reflector holder 460 facing away from the socket 420 is disposed obliquely with respect to the socket 420, so that the reflector 450 is disposed obliquely with respect to the socket 420.

In the embodiment of the present application, when the reflector support 460 is fixed on the support plate 470, it is required to ensure that the reflector 450 fixed on the top surface of the reflector support 460 is disposed above the second light-receiving chip 4240, so that the light with the second predetermined wavelength (for example 1310 nm) is reflected by the filter 440 and then emitted to the reflector 450, and then reflected again at the reflector 450, and the re-reflected light can directly emit to the second light-receiving chip 4240, thereby achieving the receiving of the light with 1310 nm.

When the reflection sheet support 460 is fixed to the support plate 470, one end of the reflection sheet support 460 needs to be abutted against the other end of the filter 440, and the other end of the reflection sheet support 460 is abutted against the other end of the first opening 4120 in the cap 410 to limit the reflection sheet support 460, so that the reflection sheet 450 arranged on the top surface of the reflection sheet support 460 is ensured to be fixed above the second light receiving chip 4240.

The angle between the filter 440 and the stem 420 is a first angle, the angle between the reflector 450 and the stem 420 is a second angle, and the first angle and the second angle are matched with each other, so that the light beam reflected by the filter 440 is reflected again at the reflector 450, and the light beam reflected again can be transmitted to the second light receiving chip 4240 on the stem 420 through the supporting plate 470.

In the embodiment of the present application, the first angle between the filter 440 and the socket 420 and the second angle between the reflector 450 and the socket 420 may be the same, for example, the reflector bracket 460 is vertically fixed on the supporting plate 470 such that the bottom surface of the reflector bracket 460 is parallel to the top surface, and the reflector 450 disposed on the reflector bracket 460 is parallel to the filter 440 disposed on the supporting plate 470. At this time, the exit angle of the reflected beam reflected by the filter 440 is the same as the incident angle of the reflected beam to the reflector 450, and the exit angle of the reflected beam re-reflected by the reflector 450 is the same as the incident angle of the reflected beam to the reflector 450, so that the re-reflected beam by the reflector 450 and the incident beam to the filter 440 are parallel to each other, and the re-reflected beam can directly enter the second light receiving chip 4240 on the stem 420.

In the embodiment of the present application, the first angle between the filter 440 and the stem 420 and the second angle between the reflector 450 and the stem 420 are not particularly limited, as long as the light beam reflected by the filter 440 is reflected again by the reflector 450, and the reflected light beam can directly pass through the cap 410 and be emitted to the second light-receiving chip 4240 on the stem 420.

Fig. 10 is a cross-sectional view of a lens assembly in an optical module according to an embodiment of the present application. As shown in fig. 10, in order to facilitate the light beam transmitted through the filter 440 to be emitted into the first light receiving chip 4220, the upper surface of the tube seat 420 is further provided with a first lens 4210, and the first lens 4210 is disposed between the support plate 470 and the first light receiving chip 4220, and is used for converging the 1270nm light transmitted through the filter 440 and the support plate 470 into the first light receiving chip 4220.

Similarly, in order to facilitate the light beam reflected again by the reflector 450 to be emitted into the second light receiving chip 4240, the second lens 4230 is further disposed on the upper surface of the stem 420, and the second lens 4230 is disposed between the support plate 470 and the second light receiving chip 4240, and is configured to converge the 1310nm light, which is reflected by the filter 440 and reflected again by the reflector 450 and passes through the support plate 470, into the second light receiving chip 4240.

Fig. 11 is a schematic view of a receiving optical path of an optical module according to an embodiment of the present application. As shown in fig. 11, when the optical fiber adapter transmits light of 1270/1310nm from the outside TO the light receiving TO assembly 402, and the light of 1270/1310nm is transmitted TO the filter 440, the light of 1270nm directly transmits through the filter 440, then passes through the support plate 470 TO the first lens 4210, and is converged TO the first light receiving chip 4220 through the first lens 4210, so that the detection and reception of the light of 1270nm are realized; the 1310nm light is reflected at the filter 440, the reflected 1310nm light is emitted to the reflector 450, and is reflected again at the reflector 450, and the reflected 1310nm light passes through the support plate 470 and is emitted to the second lens 4230, and is converged to the second light receiving chip 4240 through the second lens 4230, so that the detection and reception of the 1310nm light are realized.

In the embodiment of the present application, 1270nm and 1310nm light are separated by the filter 440 located at the tilted window of the tube cap 410, so that the isolation of light beams with different wavelengths is ensured.

Fig. 12 is a schematic diagram of a transmitting/receiving optical path of an optical module according to an embodiment of the present application. As shown in fig. 12, the optical transceiver sub-module 400 provided in this embodiment of the present application includes a transmitting TO assembly 401, an optical receiving TO assembly 402, and a splitter 403, where a light beam transmitted by the transmitting TO assembly 401 directly passes through the splitter 403 TO be emitted TO the optical fiber adapter 500, and is emitted through the optical fiber adapter 500, so as TO implement light emission; the optical fiber adapter 500 transmits two 1270/1310nm received lights from the outside TO the optical transceiver sub-module 400, the two 1270/1310nm received lights are reflected at the light splitter 403, the reflected received lights are emitted TO the light receiving TO assembly 402, the two 1270/1310nm received lights are split when being emitted TO the filter 440 at the inclined window of the tube cap 410, and the 1270nm light directly passes through the filter 440 and is converged TO the first light receiving chip 4220 through the first lens 4210; the 1310nm light is reflected at the filter 440, the reflected 1310nm light is emitted to the reflector 450, and is reflected again at the reflector 450, and the reflected 1310nm light passes through the cap 410 and is converged to the second light receiving chip 4240 through the second lens 4230.

The optical module comprises a circuit board and a light receiving sub-module, wherein the light receiving sub-module is electrically connected with the circuit board and used for receiving optical signals; the optical receiving sub-module comprises an optical receiving TO assembly, the optical receiving TO assembly comprises a tube seat, a tube cap, a supporting plate, a filter, a reflector bracket and a reflector, a first optical receiving chip and a second optical receiving chip are arranged on the tube seat, and light containing a plurality of different wavelengths is emitted into the optical receiving TO assembly 402 through an optical fiber adapter and then is respectively emitted into the different optical receiving chips after wavelength screening; the pipe cap cover is arranged on the pipe seat, a first opening is arranged on the side surface of the pipe cap cover, which is back to the pipe seat, and the side surface of the first opening is obliquely arranged relative to the pipe seat, namely the pipe cap is an oblique window pipe cap; the supporting plate is embedded in the pipe cap, is obliquely arranged relative to the pipe seat and is used for supporting and fixing the filter and the reflector bracket; the filter is arranged on the support plate and used for transmitting the light beam with the first preset wavelength, converging the light beam penetrating through the filter to the first light receiving chip through the first lens and reflecting the light beam with the second preset wavelength; the reflector plate support is arranged on the supporting plate, the reflector plate is arranged on the reflector plate support and used for reflecting the light beam with the second preset wavelength reflected by the filter plate, and the light beam reflected by the reflector plate is converged to the second light receiving chip through the second lens. According TO the optical transceiver subassembly, a plurality of received lights with different wavelengths are transmitted TO the optical receiver TO subassembly, the optical receiver TO subassembly can realize the separation of a plurality of light beams with different wavelengths through the filter plate and the reflector plate, the plurality of optical receiver chips respectively detect the separated light beams, and compared with the plurality of optical receiver TO subassemblies, one optical receiver TO subassembly can effectively reduce the length of the optical transceiver subassembly 400, so that the overall size of the optical transceiver subassembly is reduced, and the miniaturization requirement of an optical module is facilitated; in addition, only one tube seat and one tube cap are needed for one light receiving TO assembly, so that the advantage of further reducing the cost is achieved; in addition, the optical transceiver sub-assembly with the plurality of optical receiving channels only comprises one optical receiving TO assembly, so that the optical transceiver sub-assembly only needs TO be coupled once during production, and the production efficiency is greatly improved.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.

Claims (10)

1. A light module, comprising:

a circuit board;

the light receiving secondary module is electrically connected with the circuit board and used for receiving light signals;

wherein the optical receive sub-module comprises:

a stem on which at least two light receiving chips are disposed;

the pipe cap is covered on the pipe seat, an opening is formed in the side surface of the pipe cap, which is back to the pipe seat, and the side surface where the opening is located is obliquely arranged relative to the pipe seat;

the supporting plate is embedded in the pipe cap and is obliquely arranged relative to the pipe seat;

the filter is arranged on the support plate and used for transmitting a light beam with a first preset wavelength, and the light beam penetrating through the filter is emitted to the light receiving chip; reflecting the light beam with the second preset wavelength;

the reflector plate bracket is arranged on the supporting plate;

and the reflector plate is arranged on the reflector plate bracket and used for reflecting the light beam reflected by the filter plate, and the light beam reflected by the reflector plate is emitted to the other light receiving chip.

2. The optical module as claimed in claim 1, wherein the reflector bracket is disposed at a predetermined angle with respect to the supporting plate.

3. The optical module of claim 2, wherein the reflector bracket is vertically fixed to the support plate.

4. The optical module according to claim 1, wherein the reflector bracket comprises a first support plate, a second support plate and a third support plate, the first support plate and the second support plate are respectively connected with the third support plate, and a gap exists between the first support plate and the second support plate;

one end of the reflector plate is arranged on the first supporting plate, and the other end of the reflector plate is arranged on the second supporting plate.

5. The optical module according to claim 4, wherein a first side of the first support plate facing away from the stem is flush with a second side of the second support plate facing away from the stem, a third side of the third support plate facing away from the stem protrudes from the first side, a fourth side is disposed between the third side and the first side, and a side of the reflector plate is in contact with the fourth side.

6. The optical module of claim 1, wherein an angle between the filter and the socket is a first angle, an angle between the reflector and the socket is a second angle, and the first angle matches the second angle.

7. The optical module of claim 1, wherein one end of the filter abuts against one end of the opening, the other end abuts against one end of the reflector holder, and the other end of the reflector holder abuts against the other end of the opening.

8. The optical module of claim 1, wherein the support plate is a flat glass, and a side surface of the flat glass is fixed in abutment with an inner side wall of the cap.

9. The optical module of claim 8, wherein the support plate is parallel to the inclined surface of the opening.

10. The optical module according to claim 1, wherein a first lens, a first light receiving chip, a second lens and a second light receiving chip are disposed on the stem, the first lens is disposed between the supporting plate and the first light receiving chip, and is configured to focus the light beam transmitted through the filter onto the first light receiving chip;

the second lens is arranged between the support plate and the second light receiving chip and used for converging the light beams reflected by the reflector plate to the second light receiving chip.

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