CN114200598B

CN114200598B - Optical module

Info

Publication number: CN114200598B
Application number: CN202010988607.0A
Authority: CN
Inventors: 刘学儒; 张洪浩; 唐毅; 王斌; 叶书华; 傅钦豪; 谢一帆; 张加傲; 黄绪杰; 董本正
Original assignee: Hisense Broadband Multimedia Technology Co Ltd
Current assignee: Hisense Broadband Multimedia Technology Co Ltd
Priority date: 2020-09-18
Filing date: 2020-09-18
Publication date: 2022-10-21
Anticipated expiration: 2040-09-18
Also published as: CN114200598A

Abstract

The application provides an optical module, includes: the circuit board reaches the optical emission submodule and the optical reception submodule that are connected with the circuit board electricity respectively, the optical emission submodule includes the optical emission casing, the optical emission apron, the optical emission casing forms the optical emission cavity with the optical emission apron, be provided with a plurality of laser component groups in the optical emission cavity, a plurality of optical multiplexer, lens subassembly and first optical fiber adapter, the multiplex beam of the different wavelength of a plurality of laser component group transmission is multiplexed into the multiplex composite beam via a plurality of optical multiplexer, the multiplex composite beam is via the reflection of lens subassembly, refraction, multiplex composite beam is signal light all the way, signal light coupling all the way is launched to first optical fiber adapter. The optical module that this application provided passes through optical multiplexer, lens subassembly with multiplexing of multiplex beam for light beam all the way, has realized the signal light simultaneous transmission of a plurality of wavelengths in the single optical fiber, and the volume that occupies of emission of light secondary module in the optical module reduces, is favorable to the miniaturized development 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

With the development of new services and application modes such as cloud computing, mobile internet, video and the like, the development and progress of the optical communication technology become increasingly important. In the optical communication technology, an optical module is a tool for realizing the interconversion of optical signals and is one of key devices in optical communication equipment, and the transmission rate of the optical module is continuously increased along with the development requirement of the optical communication technology.

Generally, to increase the transmission rate of an optical module, increasing the transmission channel in the optical module may be used, such as modifying the conventional optical module including one set of tosa (emitting light of one wavelength) and one set of rosa (receiving light of one wavelength) to include two sets of tosa (each set emitting light of one wavelength) and two sets of rosa (each set receiving light of one wavelength). Therefore, the occupied volumes of the optical transmitting sub-module and the optical receiving sub-module in the optical module are increased continuously, and further the further development of the optical module is not facilitated.

Disclosure of Invention

The embodiment of the application provides an optical module, which is convenient for realizing simultaneous transmission of signal lights with multiple wavelengths in a single optical fiber and realizing miniaturization packaging of the optical module.

The application provides an optical module, includes:

a circuit board;

the light emission secondary module is electrically connected with the circuit board and is used for emitting multi-channel signal light with different wavelengths;

the optical receiving sub-module is electrically connected with the circuit board, is stacked with the optical transmitting sub-module and is used for receiving multiple paths of signal light with different wavelengths;

wherein, the transmitter optical subassembly includes:

a light emitting housing;

the light emission cover plate covers the light emission shell and forms a light emission cavity with the light emission shell;

the laser component groups are arranged in the light emission cavity and used for emitting multiple paths of light beams with different wavelengths;

a plurality of optical multiplexers arranged in the light emission cavity and corresponding to the plurality of laser component groups, and used for respectively multiplexing the multi-path light beams with different wavelengths into multi-path composite light beams;

the lens assembly is arranged in the light emission cavity and used for respectively reflecting and refracting the multi-path composite light beam and multiplexing the multi-path composite light beam into one path of signal light;

and the first optical fiber adapter is connected with the light emission shell and used for receiving the signal light and emitting the signal light.

The application provides an optical module, which comprises a circuit board, the optical transmission submodule that is connected with the circuit board electricity reaches the optical reception submodule that is connected with the circuit board electricity, the optical transmission submodule is including transmitting casing and transmission apron, it forms transmission cavity with transmission apron to transmit the casing, be provided with a plurality of laser component group in the transmission cavity, a plurality of optical multiplexer, lens subassembly and first optical fiber adapter, a plurality of laser component group are used for transmitting the multiplex beam of different wavelength, a plurality of optical multiplexer are used for multiplexing the multiplex beam of different wavelength into multiplex composite beam respectively, the lens subassembly is used for reflecting multiplex composite beam respectively, refraction, multiplex composite beam into signal light all the way, this signal light conveys first optical fiber adapter all the way, go out signal light through first optical fiber adapter. The multi-wavelength optical fiber adapter comprises a plurality of laser component groups, a plurality of optical multiplexers, a plurality of lens assemblies, a plurality of optical multiplexers, a plurality of optical fiber adapters and a plurality of optical fiber couplers, wherein the plurality of laser component groups are arranged to emit multi-path light beams with different wavelengths; in addition, the multi-path light beams are multiplexed into one path of light beams through the optical multiplexer and the lens assembly, so that the occupied volume of the transmitter optical subassembly in the optical module is reduced, and the development of miniaturization of the optical module is facilitated.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the embodiments or the prior art description 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 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 partial cross-sectional view of an optical module according to an embodiment of the present disclosure;

fig. 6 is a schematic diagram illustrating a separation structure of a light emission sub-module and a light reception sub-module in an optical module according to an embodiment of the present disclosure;

fig. 7 is a partially exploded schematic view of a light emission sub-module in an optical module according to an embodiment of the present disclosure;

fig. 8 is a schematic structural diagram of a light emitting device in a light module according to an embodiment of the present disclosure;

fig. 9 is a schematic view of another angle structure of a light emitting device in a light module according to an embodiment of the present disclosure;

fig. 10 is a light path diagram of a light emission sub-module in an optical module according to an embodiment of the present disclosure;

fig. 11 is an optical path diagram of a lens assembly in an optical module according to an embodiment of the present disclosure;

fig. 12 is an assembly schematic diagram of a lens assembly, an optical multiplexer, and a supporting platform in an optical module according to an embodiment of the present application;

fig. 13 is a schematic structural diagram of a supporting platform in an optical module according to an embodiment of the present disclosure;

fig. 14 is a schematic partial structural view of a supporting platform in an optical module according to an embodiment of the present disclosure;

fig. 15 is an assembly schematic diagram of a laser module and a photodetector in an optical module according to an embodiment of the present disclosure;

fig. 16 is an exploded schematic view of a laser module in an optical module according to an embodiment of the present disclosure;

fig. 17 is an assembly schematic diagram of a photodetector and a laser driver in an optical module according to an embodiment of the present disclosure;

fig. 18 is a schematic structural diagram of a photodetector in an optical module according to an embodiment of the present disclosure;

fig. 19 is a schematic structural diagram of a ceramic transition block in an optical module according to an embodiment of the present disclosure;

fig. 20 is an exploded schematic view of a transmitting housing and a ceramic junction block in an optical module according to an embodiment of the present disclosure;

fig. 21 is a schematic structural diagram of a transmitting housing in an optical module according to an embodiment of the present disclosure;

fig. 22 is a partial cross-sectional view of a light transmitter sub-module in a light module according to an embodiment of the present disclosure.

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; in order to establish information connection between information transmission devices such as optical fibers and optical waveguides and information processing devices such as computers, interconversion between electrical signals and optical signals is required.

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 far-end server, one end of the network cable 103 is connected with local information processing equipment, and the connection between the local information processing equipment and the far-end 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.

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 an electric port of an optical module such as a golden finger; 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 optical network terminal, 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, the optical module is held by the cage, and 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 member 203, a circuit board 300, a tosa 400, and a rosa 500.

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 on two sides of the main plate and are perpendicular to the main plate; the upper shell comprises a cover plate, and the cover plate covers two side plates of the upper shell to form a wrapping cavity; the upper shell can also comprise two side walls which are positioned at two sides of the cover plate and are perpendicular to the cover plate, and the two side walls are combined with the two side plates to realize that the upper shell covers 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 the tosa 400 and the rosa 500 inside the optical module; the optoelectronic devices such as the circuit board 300, the tosa 400 and the rosa 500 are located in the package cavity.

The assembly mode of combining the upper shell and the lower shell is adopted, so that the circuit board 300, the transmitter optical subassembly 400, the receiver optical subassembly 500 and other devices can be conveniently installed in the shells, 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 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 the 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 chip on the circuit board 300 may be a multifunctional integrated chip, for example, a laser driver chip and an MCU chip are integrated into one chip, or a laser driver chip, a limiting amplifier chip and an MCU chip are integrated into one chip, and the chip is an integrated circuit, but the functions of the circuits do not disappear due to the integration, and only the circuit appears and changes, and the chip still has the circuit form. Therefore, when the circuit board is provided with three independent chips, namely, the MCU, the laser driver chip and the limiting amplifier chip, the scheme is equivalent to that when the circuit board 300 is provided with a single chip with three functions in one.

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 the 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.

The tosa and the rosa may be collectively referred to as an optical subassembly. As shown in fig. 4, the optical module provided in the embodiment of the present invention includes a tosa 400 and a rosa 500, wherein the tosa 400 and the rosa 500 are located at the edge of the circuit board 300, and the tosa 400 and the rosa 500 are stacked up and down. Optionally, the tosa 400 is closer to the upper housing 201 than the tosa 500, but is not limited thereto, and the tosa 500 may be closer to the upper housing 201 than the tosa 400.

Optionally, the tosa 400 and the rosa 500 are physically separated from the circuit board 300, and are connected to the circuit board 300 through flexible circuit boards.

When the tosa 400 is closer to the upper housing 201 than the rosa 500, the tosa 400 and the rosa 500 are disposed in the upper and lower housing forming package cavities, and the lower housing 202 supports the rosa 500 and the rosa 500 supports the rosa 400.

Fig. 5 is a cross-sectional view of an optical module according to an embodiment of the present disclosure. As shown in fig. 5, an optical module provided in the embodiment of the present application includes a lower housing 202, a circuit board 300, a tosa 400, and a rosa 500. The end of the tosa 400 far away from the circuit board 300 is provided with a first fiber adapter 410, and the first fiber adapter 410 is used for transmitting the signal light generated by the tosa 400 to the outside of the optical module; the end of the rosa 500 remote from the circuit board 300 is provided with a second fiber adapter 510, and the second fiber adapter 510 is used for transmitting signal light from the outside of the optical module to the inside of the rosa 500. The circuit board 300 is electrically connected to the tosa 400 and the rosa 500 through corresponding flexible circuit boards, respectively.

The size of the whole appearance of the optical module is in accordance with the size of an interface of an upper computer and is limited by industry standards, and the tosa 400 and the tosa 500 have large volumes and cannot be arranged on the circuit board 300, so the tosa is arranged in a manner of being separated from the circuit board 300, and the electrical connection transfer is realized through a flexible circuit board. As shown in fig. 5, the first fiber optic adapter 410 and the second fiber optic adapter 510 are at the same height as compared to the bottom surface of the lower housing 202. The first fiber adapter 410 and the second fiber adapter 510 are respectively used for connecting with fiber connectors outside the optical module; the optical fiber connector outside the optical module is a standard component commonly used in the industry, and the shape and size of the external optical fiber connector limit the positions of the two optical fiber adapters inside the optical module, so that the first optical fiber adapter 410 and the second optical fiber adapter 510 are arranged on the same height in the product.

Fig. 6 is a schematic structural diagram illustrating a separation structure of an tosa and an rosa according to an embodiment of the present disclosure. As shown in fig. 6, the rosa 500 provided in the embodiment of the present application further includes a light receiving cavity 520 and a light receiving cover 530, and the light receiving cover 530 covers the light receiving cavity 520 from above. The light receiving cavity 520 is provided therein with devices related to light reception, such as a lens, a light receiving chip, and a transimpedance amplifier. One end of the light receiving cavity 520 is connected to the second optical fiber adapter 510, and receives signal light from the outside of the optical module through the second optical fiber adapter 510, and transmits the received signal light to the light receiving chip through optical devices such as a lens arranged in the light receiving cavity 520; an opening 521 is provided on the side wall of the other end of the light receiving cavity 520 for insertion of a flexible circuit board. One end of the flexible circuit is inserted into and fixed in the light receiving cavity 520 and electrically connected to the light receiving chip, the transimpedance amplifier and other electrical devices, and the other end of the flexible circuit is used for electrically connecting to the circuit board 300.

Fig. 7 is a partially exploded schematic view of a light emission submodule in an optical module according to an embodiment of the present disclosure, and fig. 8 is a schematic structural view of a light emitting device 404 in an optical module according to an embodiment of the present disclosure. As shown in fig. 7 and 8, the tosa 400 provided in the embodiment of the present invention includes a light emitting casing 401 and a light emitting cover 402 covering the light emitting casing 401, wherein the light emitting casing 401 and the light emitting cover 402 form a light emitting cavity 403, and a light emitting device 404 such as a laser, a light detector, a laser driver, and a lens is disposed in the light emitting cavity 403. One end of the light emitting housing 401 is connected to the first optical fiber adapter 410, and the light emitting device 404 is configured to emit multiple light beams, where the multiple light beams are multiplexed into one light beam and then finally converged and coupled to the first optical fiber adapter 410, so as to realize that multiple light beams are emitted through one optical fiber. The other end of the light emitting shell 401 is provided with a ceramic adapter block, the ceramic adapter block is connected with one end of a flexible circuit board, and the flexible circuit board is electrically connected with photoelectric devices such as a laser, a light detector and a laser driver through the ceramic adapter block; the other end of the flexible circuit board is used for electrical connection with the circuit board 300. The light emitting housing 401 and the light emitting cover 402 may be made of metal material, such as die-cast or milled metal.

In the optical module provided in the embodiment of the present application, the tosa 400 is configured to emit multiple signal lights with different wavelengths, the signal lights with different wavelengths are reflected and refracted by optical devices such as different lenses in the light emitting cavity 403 to combine the signal lights, and the combined signal light is transmitted to an external optical fiber through the first optical fiber adapter 410.

Specifically, the light emitting device 404 includes a plurality of laser component groups for emitting a plurality of light beams of different wavelengths, a plurality of collimating lenses 4042, a plurality of optical multiplexers, and a lens assembly. In the embodiment of the present application, the light emitting device 404 includes two laser component groups, each laser component group includes a plurality of laser components 4041, each laser component 4041 emits one light beam, and each collimating lens 4042 is disposed in the outgoing light direction of each laser component 4041 and is configured to convert the light beam outgoing from the laser component 4041 into a collimated light beam; the optical multiplexer is arranged in the emergent light direction of the collimating lens 4042 and is used for multiplexing a plurality of paths of light beams with different wavelengths into a path of composite light beam; the lens assembly is disposed in the light emitting direction of the optical multiplexer, and is configured to couple one path of the composite light beam emitted by the optical multiplexer into the first optical fiber adapter 410 after reflection and refraction, so as to implement light emission.

Fig. 9 is another schematic view of an angular structure of the light emitting device 404 in the optical module according to the embodiment of the present disclosure, and fig. 10 is a schematic view of an optical path of the light emitting device 404 in the optical module according to the embodiment of the present disclosure. As shown in fig. 9 and 10, the light emitting device 404 may include 8 laser assemblies 4041, 8 collimating lenses 4042, a first optical multiplexer 4043, a second optical multiplexer 4044, a first lens 4045, a second lens 4046, and a third lens 4047,8 laser assemblies 4041 emitting 8 light beams with different wavelengths; 8 collimator lenses 4042 are provided in the exit light direction of the 8 laser modules 4041 to convert 8 light beams of different wavelengths into 8 collimated light beams; the first optical multiplexer 4043 and the second optical multiplexer 4044 are both arranged in the light exit direction of the 8 collimating lenses 4042, 4 collimated light beams enter the first optical multiplexer 4043, the remaining 4 collimated light beams enter the second optical multiplexer 4044, the 4 collimated light beams entering the first optical multiplexer 4043 can be reflected in the first optical multiplexer 4043, and finally multiplexed into a first composite light beam which is emitted by the first optical multiplexer 4043; similarly, the 4 collimated beams entering the second optical multiplexer 4044 can be reflected within the second optical multiplexer 4044 and eventually multiplexed into a second composite beam that exits the second optical multiplexer 4044.

The first lens 4045 is disposed in the direction of the outgoing light of the first optical multiplexer 4043, and the second lens 4046 is disposed in the direction of the outgoing light of the first lens 4045, so that the first composite light beam emitted by the first optical multiplexer 4043 sequentially passes through the first lens 4045 and the second lens 4046; the third lens 4047 is disposed in the light outgoing direction of the second optical multiplexer 4044, the second composite light beam emitted by the second optical multiplexer 4044 enters the third lens 4047, and is reflected by the third lens 4047, the reflected second composite light beam enters the second lens 4046, is reflected again by the second lens 4046, the second composite light beam enters the first lens 4045, is reflected again by the first lens 4045, and the second composite light beam enters the second lens 4046 again, and this time the second composite light beam passes through the second lens 4046. The first composite light beam and the second composite light beam entering the second lens 4046 may be combined in the second lens 4046, and the first composite light beam and the second composite light beam are combined into one light beam, which may be converged and coupled into the first fiber adapter 410.

The first optical multiplexer 4043 and the second optical multiplexer 4044 are structurally identical components, the first optical multiplexer 4043 includes a glass carrier coated with a reflective film on one side and a plurality of narrow band filters, and the optical multiplexer can adjust the corresponding splitting wavelength band of the optical multiplexer by adding or adding the narrow band filters according to needs. Specifically, the first optical multiplexer 4043 includes four narrow band filters for selectively filtering the light beams entering the first optical multiplexer 4043 such that the four light beams that meet the requirements enter the first optical multiplexer 4043. The light beam entering the first optical multiplexer 4043 is reflected at the glass carrier coated with the reflective film, the first light beam is reflected and then combined with the second light beam into a first combined light, the first combined light is continuously reflected at the glass carrier coated with the reflective film, the first combined light is reflected and then combined with the third light beam into a second combined light, the second combined light is continuously reflected at the glass carrier coated with the reflective film, the second combined light is reflected and then combined with the fourth light beam into a third combined light, and the third combined light is emitted from the emitting end of the first optical multiplexer 4043. Thus, the first optical multiplexer 4043 combines the 4 collimated light beams into a first composite light beam, which is emitted through the emission end of the first optical multiplexer 4043; the second optical multiplexer 4044 combines the additional 4 collimated light beams into a second composite light beam, which exits via the exit end of the second optical multiplexer 4044.

Fig. 11 is an optical path diagram of a lens assembly in an optical module according to an embodiment of the present disclosure. As shown in fig. 11, the first composite light beam emitted by the first optical multiplexer 4043 directly passes through the first lens 4045, and the first composite light beam passing through the first lens 4045 is incident on the incident light surface of the second lens 4046; the second light incident surface 4073 of the third lens 4047 is provided with a reflective film, and the second composite light beam emitted by the second optical multiplexer 4044 is reflected at the reflective film of the light incident surface of the third lens 4047, so as to change the exit direction of the second composite light beam, and the second composite light beam is reflected to the second lens 4046 through the third lens 4047. The first composite beam can be directly transmitted on the first light incident surface 4072 of the second lens 4046, and the reflected second composite beam is reflected on the first light incident surface 4072 of the second lens 4046, so that the reflected second composite beam is reflected to the first lens 4045 again through the second lens 4046; the second composite light beam reflected by the second lens 4046 to the exit light surface 4071 of the first lens 4045 is reflected again on the exit light surface 4071 of the first lens 4045, so that the second composite light beam is reflected to the second lens 4046 via the first lens 4045, and the second composite light beam reflected again to the second lens 4046 can be directly transmitted on the first incident light surface 4072 of the second lens 4046.

Specifically, the first light incident surface 4072 of the second lens 4046 may be provided with an angle selection film, and the angle selection film may selectively transmit the incident light to the first light incident surface 4072, that is, the angle selection film is provided with a preset incident light angle, and when the incident angle of the light to the first light incident surface 4072 satisfies the preset incident light angle, the light beam may directly transmit the second lens 4046; when the incident angle of the light incident on the first light incident surface 4072 does not satisfy the predetermined incident angle, the light beam is reflected at the first light incident surface 4072 to change the incident angle of the incident light beam until the incident angle of the light beam satisfies the predetermined incident angle of the first light incident surface 4072.

In the embodiment of the present application, the incident angle of the first composite light beam transmitted by the first lens 4045 satisfies the predetermined incident angle of the first incident light surface 4072 of the second lens 4046, so that the first composite light beam can be directly transmitted through the second lens 4046. The second composite light beam reflected by the third lens 4047 to the first light incident surface 4072 of the second lens 4046 has an incident angle larger than the preset incident angle of the first light incident surface 4072 of the second lens 4046, so that the second composite light beam is reflected again at the first light incident surface 4072, and the reflected second composite light beam is emitted to the light exit surface 4071 of the first lens 4045.

In the embodiment of the present application, the preset incident angle of the angle selection film disposed on the first incident light surface 4072 of the second lens 4046 may be 0 to 45 °, and the incident angle of the first multiplexed light beam passing through the first lens 4045 to the first incident light surface 4072 of the second lens 4046 is 37 °, which satisfies the preset incident angle of the angle selection film, so that the first multiplexed light beam can directly transmit through the angle selection film; the second multiplexed beam reflected by the third lens 4047 to the first entrance surface 4072 of the second lens 4046 has an entrance angle of 57 ° which exceeds the predetermined entrance angle of the angle selection film, so that the second multiplexed beam is reflected at the angle selection film.

First incident surface 4072 department of second lens 4046 that this application embodiment provided is not only limited to and sets up the angle selection membrane, also can set up other diaphragms, as long as this diaphragm can realize that first compound light beam direct transmission passes through first incident surface 4072, and second compound light beam takes place to reflect in first incident surface 4072 department, and it all belongs to the protection scope of this application embodiment.

In order to enable the second composite light beam to pass through the second lens 4046, the incident angle of the second composite light beam to the first incident light surface 4072 of the second lens 4046 needs to be reduced, so that the second composite light beam reflected on the first incident light surface 4072 of the second lens 4046 can be reflected again, and when the second composite light beam reflected again is incident on the first incident light surface 4072 of the second lens 4046, the incident angle is reduced, and the preset incident angle of the angle selection film can be satisfied.

The light exit surface 4071 of the first lens 4045 is provided with a transflective film, which can select a wavelength, that is, a light beam in a certain wavelength range can directly transmit through the transflective film, and a light beam exceeding the wavelength range is reflected at the transflective film. In the embodiment of the present application, the wavelength of the first composite light beam satisfies the wavelength range of the transflective film, so that the first composite light beam can be directly transmitted through the light exit surface 4071 of the first lens 4045; and the wavelength of the second composite light beam does not satisfy the wavelength range of the transflective film, the second composite light beam reflected by the second lens 4046 to the exit surface 4071 of the first lens 4045 is reflected at the transflective film, so that the second composite light beam is reflected again to the first incident surface 4072 of the second lens 4046 by the exit surface 4071 of the first lens 4045.

After the reflection of the first incident light surface 4072 of the second lens 4046 and the re-reflection of the exit light surface 4071 of the first lens 4045, the incident angle of the second composite light beam entering the first incident light surface 4072 of the second lens 4046 is reduced, so that the incident angle of the second composite light beam can satisfy the preset incident light angle of the angle selection film, and the reflected second composite light beam can transmit through the second lens 4046.

The first composite light beam and the second composite light beam reflected by the first composite light beam and then entering the second lens 4046 again may be combined in the second lens 4046, that is, the first composite light beam and the second composite light beam are combined into one light beam in the second lens 4046, and the one light beam is emitted by the second lens 4046 and then coupled to the first optical fiber adapter 410.

In order to improve the coupling efficiency, a converging lens 409 may be disposed between the second lens 4046 and the fiber ferrule end face of the first fiber adapter 410, and one light beam emitted by the second lens 4046 is converged and coupled to the first fiber adapter 410 through the converging lens 409, and is finally transmitted out through an external fiber.

A flat light window 4048 may be further disposed between the second lens 4046 and the condensing lens 409, and the flat light window 4048 is a glass sheet allowing light to pass therethrough, and in order to enhance the transmittance of the flat light window and prevent the light reflection phenomenon from affecting the performance of the light emitting device 404, the glass sheet is usually tilted at a predetermined angle (usually 8 degrees), and an enhancement film corresponding to the wavelength is coated on the surface of the glass sheet. The planar optical window 4048 is typically disposed on a side wall of the light emitting housing 401 connected to the first fiber optic adapter 410 as a communication component of the light emitting device 404 and the first fiber optic adapter 410, and the light emitting device 404 can transmit an optical signal with the first fiber optic adapter 410 through the planar optical window 4048.

The light emitting device 404 provided by the embodiment of the present application includes 8 laser assemblies 4041, 8 collimating lenses 4042, a first optical multiplexer 4043, a second optical multiplexer 4044, a first lens 4045, a second lens 4046, and a third lens 4047,8 laser assemblies 4041 for emitting laser beams of 8 channels; the 8 collimating lenses 4042 are respectively arranged in the light outgoing direction of the 8 laser components 4041, and are used for collimating the laser beams of the 8 channels to obtain collimated beams of the 8 channels; the first optical multiplexer 4043 and the second optical multiplexer 4044 are both arranged in the light-emitting direction of the 8 collimating lenses 4042, each of the first optical multiplexer 4043 and the second optical multiplexer 4044 includes 4 input channels, 4 channels of the 8 channels of collimated light beams enter the 4 channels of the first optical multiplexer 4043, the other 4 channels of collimated light beams enter the 4 channels of the second optical multiplexer 4044, the first optical multiplexer 4043 converts the 4 channels of collimated light beams into one first composite light beam, and the second optical multiplexer 4044 converts the 4 channels of collimated light beams into one second composite light beam; the first lens 4045 is arranged in the light outgoing direction of the first optical multiplexer 4043, the second lens 4046 is arranged in the light outgoing direction of the first lens 4045, and the first composite light beam emitted by the first optical multiplexer 4043 is directly transmitted through the first lens 4045 and the second lens 4046; the third lens 4047 is disposed in the light exit direction of the second optical multiplexer 4044, the second composite light emitted by the second optical multiplexer 4044 is reflected to the second lens 4046 through the third lens 4047, because the incident angle of the reflected second composite light does not satisfy the preset incident angle of the incident light surface of the second lens 4046, the reflected second composite light beam is reflected at the incident light surface of the second lens 4046 and is reflected to the light exit surface of the first lens 4045, the reflected second composite light is reflected again on the light exit surface of the first lens 4045, the second composite light after being reflected is incident to the incident light surface of the second lens 4046 again, and because the incident angle of the reflected second composite light is reduced, the second composite light reflected from the light exit surface of the first lens 4045 to the second lens 4046 can directly transmit through the second lens 4046; the first composite light and the second composite light entering the second lens 4046 after being reflected can be combined into a beam in the second lens 4046, and the beam is coupled to the first optical fiber adapter 410 through the planar optical window 4048 and the converging lens 409, so that the light emission of 8-channel wavelength division multiplexing is realized. This application is two light beams with 8 passageway light beam multiplexing through two optical multiplexer, and the transmission of two way light beams is realized with control incident light angle to the coating film of 3 lens again, reflects two way light beams into a light beam of the same kind, and this light beam of the same kind finally assembles the coupling to outside optic fibre, has reduced the volume that the emission of light submodule held in the optical module, is favorable to the miniaturized development of optical module.

In this embodiment of the present application, in order to implement the emission optical path described in the above embodiment, a platform for supporting and coupling devices needs to be provided for the first optical multiplexer 4043, the second optical multiplexer 4044, the first lens 4045, the second lens 4046, and the third lens 4047 in the optical path structure, so as to implement the passive coupling of the first optical multiplexer 4043, the second optical multiplexer 4044, the first lens 4045, the second lens 4046, and the third lens 4047, and reduce the coupling difficulty of the emission optical path.

Fig. 12 is an assembly schematic diagram of a supporting platform, an optical multiplexer, and a lens assembly in an optical module according to an embodiment of the present disclosure, and fig. 13 is a structural schematic diagram of the supporting platform in the optical module according to an embodiment of the present disclosure. As shown in fig. 12 and 13, a supporting platform 408 is disposed in the light emitting cavity 403, and a first optical multiplexer 4043, a second optical multiplexer 4044, a first lens 4045, a second lens 4046, and a third lens 4047 are disposed on the supporting platform 408, so as to realize passive coupling of the optical multiplexer and the lens assembly in the optical path of the dual optical multiplexer. The support platform 408 is provided with a lens holder and a plurality of platforms, the first optical multiplexer 4043 and the second optical multiplexer 4044 are fixed to the plurality of platforms, and the lens assemblies (the first lens 4045, the second lens 4046 and the third lens 4047) are fixed to the lens holder.

The support platform 408 may be adhered to the floor of the light emission cavity 403, i.e. the support platform 408 is adhered to the floor of the light emission cavity 403 by glue. A first platform 4081 and a second platform 4086 are arranged on one side of the supporting platform 408 close to the collimating lens 4042, a first partition 4084 is arranged between the first platform 4081 and the second platform 4086, a second partition 4089 is arranged on one side of the second platform 4086 far away from the first platform 4081, and the first partition 4084 and the second partition 4089 are arranged in parallel. That is, the first partition 4084 and the second partition 4089 on the support platform 408 divide the side of the support platform 408 near the collimating lens 4042 into two parts, one part being the first platform 4081 and the other part being the second platform 4086. The first platform 4081 is provided with a first mounting groove 4082, the second optical multiplexer 4044 is embedded in the first mounting groove 4082, and two opposite side surfaces of the second optical multiplexer 4044 are respectively contacted with two side walls of the first mounting groove 4082. That is, the light incident surface of the second optical multiplexer 4044 contacts one side wall of the first mounting groove 4082, and the light emitting surface contacts the other side wall opposite to the first mounting groove 4082.

The light incident surface of the second optical multiplexer 4044 is provided with an incident light port for receiving the collimated light beam emitted from the collimating lens 4042. In this embodiment, the light incident surface of the second optical multiplexer 4044 is provided with 4 light incident ports, each light incident port is configured to receive the collimated light beam emitted by one collimating lens 4042, and transmit the received collimated light beam into the second optical multiplexer 4044 for reflection and light combination.

In order to prevent the collimated light beam emitted by the collimating lens 4042 from being reflected at the incident light port, the reflected light returns to the collimating lens 4042 along the original path, the incident light port on the incident surface of the second optical multiplexer 4044 is obliquely arranged, and the collimated light beam is obliquely arranged from bottom to top from the collimating lens 4042 towards the second optical multiplexer 4044, so that when the collimated light beam enters the incident light port, the collimated light beam enters the second optical multiplexer 4044 through the incident light port, and when part of the collimated light beam is reflected at the incident light port, the reflected light beam and the incident light beam form a certain angle, and the reflected light beam cannot return to the collimating lens 4042 along the incident light path of the incident light beam, and the collimating performance of the collimating lens 4042 cannot be affected.

For fixed second optical multiplexer 4044, be provided with first adhesive deposite groove 4083 in the first mounting groove 4082, this first adhesive deposite groove 4083 contacts with the bottom surface of second optical multiplexer 4044 for the simple and convenient, reliable point of second optical multiplexer 4044 and first mounting groove 4082 bottom surface is glued sealedly, effectively improves the sealed effect of point processing of gluing, thereby has improved the installation steadiness of second optical multiplexer 4044.

Because of the large size of the second optical multiplexer 4044, the first glue dispensing slot 4083 needs to be filled with glue to avoid insufficient reliability of the shearing force. The bottom edge of the first partition 4084 is communicated with the first mounting groove 4082, so that the first mounting groove 4082 can be supplemented with glue through the side edge of the first partition 4084.

For the convenience mend gluey through first baffle 4084, one side that first baffle 4084 kept away from first platform 4081 is equipped with first inclined plane 4085, and this first inclined plane 4085 is from the top surface of first baffle 4084 to the bottom surface from the top down slope setting, so can conveniently mend gluey, and glue flows in slowly to first mounting groove 4082 along this first inclined plane 4085, has avoided glue to pile up the bottom at first baffle 4084.

Similarly, the second platform 4086 is provided with a second mounting groove 4087, the first optical multiplexer 4043 is embedded in the second mounting groove 4087, and two opposite side surfaces of the first optical multiplexer 4043 are respectively in contact with two side walls of the second mounting groove 4087. That is, the light incident surface of the first optical multiplexer 4043 contacts one side wall of the second mounting groove 4087, and the light emitting surface contacts the other side wall opposite to the second mounting groove 4087.

The light incident surface of the first optical multiplexer 4043 is provided with an incident light port for receiving the collimated light beam emitted from the collimating lens 4042. In this embodiment, the light incident surface of the first optical multiplexer 4043 is provided with 4 light incident ports, each light incident port is configured to receive the collimated light beam emitted by one collimating lens 4042, and transmit the received collimated light beam into the first optical multiplexer 4043 for reflection and light combination.

In order to prevent the collimated light beam emitted by the collimating lens 4042 from being reflected at the incident light port of the first optical multiplexer 4043, the reflected light returns to the collimating lens 4042 along the original path, the incident light port on the incident surface of the first optical multiplexer 4043 is obliquely arranged, and the collimated light beam is obliquely arranged from bottom to top from the collimating lens 4042 towards the first optical multiplexer 4043, so that when the collimated light beam enters the incident light port, the collimated light beam enters the first optical multiplexer 4043 through the incident light port, and when part of the collimated light beam is reflected at the incident light port, the reflected light beam and the incident light beam form a certain angle, and the reflected light beam does not return to the collimating lens 4042 along the incident light path of the incident light beam, and the collimating performance of the collimating lens 4042 is not affected.

For fixed first optical multiplexer 4043, be provided with second point in the second mounting groove 4087 and glue groove 4088, this second point is glued groove 4088 and is contacted with first optical multiplexer 4043's bottom surface for simple and convenient, reliable point of first optical multiplexer 4043 and second mounting groove 4087 bottom surface is glued sealedly, effectively improves the sealed effect of point processing of gluing, thereby has improved first optical multiplexer 4043's installation steadiness.

Since the first optical multiplexer 4043 has a large size, in order to avoid insufficient reliability of the shearing force, the second glue dispensing groove 4088 needs to be filled with glue. The bottom edge of the second partition 4089 communicates with the second mounting groove 4087, so that the second mounting groove 4087 can be supplemented with glue through the side edge of the second partition 4089.

In order to conveniently supplement glue through the second partition 4089, a second inclined surface 4090 is arranged on one side, away from the second platform 4086, of the second partition 4089, and the second inclined surface 4090 is obliquely arranged from the top surface to the bottom surface of the second partition 4089, so that glue can be conveniently supplemented, and the glue slowly flows into the second mounting groove 4087 along the second inclined surface 4090, so that the glue is prevented from being accumulated at the bottom of the second partition 4089.

Fig. 14 is a schematic partial structural diagram of a supporting platform in an optical module according to an embodiment of the present disclosure. As shown in fig. 14, the lens fixing member includes a lens mounting post, a triangular groove 4091 is disposed on a side of the supporting platform 408 away from the collimating lens 4042, the lens mounting post is disposed in the triangular groove 4091, and the first lens 4045 and the second lens 4046 are respectively fixed on two sides of the lens mounting post. In the embodiment of the present application, the lens mounting column is a triangular protrusion 4092, a first side 4094 of the triangular protrusion 4092 faces the first optical multiplexer 4043, and an exit light surface 4071 of the first lens 4045 is adhered to the first side 4094, so that the first lens 4045 receives the first composite light beam emitted by the first optical multiplexer 4043; the second side 4095 of the triangular protrusion 4092 faces the first fiber optic adapter 410, and the first light incident surface 4072 of the second lens 4046 is attached to the second side 4095 for receiving the first composite light beam transmitted through the first lens 4045.

In the embodiment of the present application, the triangular groove 4091 is disposed on the outer edge of the triangular protrusion 4092, and is a relief groove reserved for processing the triangular protrusion 4092. The thickness of the triangular protrusion 4092 may be set according to actual conditions as long as it does not block the light exiting from the light exiting surface 4071 of the first lens 4045 and the light entering from the first light incident surface 4072 of the second lens 4046.

The side of the supporting platform 408 away from the collimating lens 4042 is further provided with a thin groove 4093, the thin groove 4093 is a long strip-shaped groove, the thin groove 4093 faces the light exit surface of the second optical multiplexer 4044, and the thin groove 4093 is disposed obliquely, that is, the thin groove 4093 is tilted from the first optical fiber adapter 410 to the second optical multiplexer 4044, and the distance between the thin groove 4093 and the light exit surface of the second optical multiplexer 4044 is gradually reduced. The bottom edge of the second light incident surface 4073 of the third lens 4047 contacts with the inclined edge of the fine groove 4093, thereby fixing the third lens 4047 at the fine groove 4093.

The third side 4096 of the triangular protrusion 4092 faces the second incident light surface 4073 of the thin groove 4093, the first side 4094 and the third side 4096 of the triangular protrusion 4092 are shorter sides, the second side 4095 is a longer side, and the angle between the first side 4094 and the second side 4095 should satisfy: when the first composite light beam transmitted through the first lens 4045 enters the first light incident surface 4072 of the second lens 4046, the incident angle thereof satisfies the predetermined incident light angle of the angle selection film provided on the first light incident surface 4072 of the second lens 4046, and when the second composite light beam reflected by the light exit surface 4071 of the first lens 4045 enters the first light incident surface 4072 of the second lens 4046, the incident angle thereof satisfies the predetermined incident light angle of the angle selection film.

The inclination angle of the thin groove 4093 needs to be matched with the angle of the second side 4095 of the triangular protrusion 4092 to ensure that the second composite light beam reflected by the second incident light surface 4073 of the third lens 4047 can be emitted onto the first incident light surface 4072 of the second lens 4046 arranged on the second side 4095 of the triangular protrusion 4092, and the incident angle of the second composite light beam is greater than the preset incident light angle of the angle selection film, so that the second composite light beam is reflected at the first incident light surface 4072 of the second lens 4046, and the second composite light beam reflected by the second lens 4046 can be emitted onto the exit light surface 4071 of the first lens 4045, and the second composite light beam provided with the exit light surface 4071 of the first lens 4045 can be reflected again at the exit light surface 4071, and the reflected second composite light beam can be emitted to.

In the embodiment of the present application, the first lens 4045, the second lens 4046, and the third lens 4047 mainly implement multiplexing of the first composite light beam and the second composite light beam by controlling the incident light angle, so that the incident light angles of the first lens 4045, the second lens 4046, and the third lens 4047 are controlled by setting the angles of the triangular protrusion 4092 and the fine groove 4093, so that after the first composite light beam directly passes through the first lens 4045, the incident angle of the first composite light beam entering the second lens 4046 meets the preset incident light angle of the first incident light surface 4072 of the second lens 4046, so that the first composite light beam can directly transmit through the second lens 4046; meanwhile, the second composite light beam is reflected at the incident light surface 4073 of the third lens 4047, the second composite light beam reflected to the first incident light surface 4072 of the second lens 4046 is continuously reflected at the first incident light surface 4072, the second composite light beam reflected again is reflected again at the exit light surface 4071 of the first lens 4045, and the incident angle of the second composite light beam reflected again can meet the preset incident angle of the first incident light surface 4072 of the second lens 4046, so that the second composite light beam reflected again can directly transmit through the second lens 4046.

In the embodiment of the present application, by providing the supporting platform 408 in the light emitting cavity 403, the supporting platform 408 is used to support the first optical multiplexer 4043, the second optical multiplexer 4044, the first lens 4045, the second lens 4046 and the third lens 4047, so as to provide an optical path coupling space and a fixed platform for them; the supporting platform 408 realizes the passive coupling of the first optical multiplexer 4043 and the second optical multiplexer 4044 through the first platform 4081 and the second platform 4086, and realizes the multiplexing of the 8-channel collimated light beam into two paths of composite light beams; and the supporting platform 408 controls the incident light angles of the first lens 4045, the second lens 4046 and the third lens 4047 through the triangular protrusion 4092 and the thin groove 4093, and combines and multiplexes the first composite light beam and the second composite light beam into one light beam, so that the passive coupling of the angles of the first lens 4045, the second lens 4046 and the third lens 4047 is realized, the difficulty in coupling the light path is greatly reduced, and the emission light path described in the above embodiment is realized.

In the example of the application, 8 channels of light are required, so 8 laser assemblies 4041 are provided within the light emission cavity 403. When the laser component 4041 emits a laser beam, an optical detector needs to be disposed on a backlight surface of the light-emitting surface of the laser component 4041, the optical detector is configured to detect the optical power of the laser beam emitted from the back surface of the laser component 4041, and the optical power of the light emitted from the front surface of the laser component 4041 is the same as the optical power of the light emitted from the back surface, so that the optical power emitted from the front surface of the laser component 4041 can be obtained according to the optical power emitted from the back surface of the laser component 4041, and the optical power emitted from the laser component 4041 can be adjusted according to actual conditions.

Fig. 15 is an assembly schematic diagram of a laser component 4041 and an optical detector in an optical module according to an embodiment of the present disclosure, and fig. 16 is an exploded structural schematic diagram of the laser component 4041 in the optical module according to the embodiment of the present disclosure. As shown in fig. 15 and 16, the laser assembly 4041 includes a laser heat sink 4062 and a laser 4063, the laser 4063 is disposed on a top surface of the laser heat sink 4062, and a front surface of the laser 4063 faces the collimating lens 4042 to emit a laser beam; the back of the laser 4063 faces the optical detector, which receives the laser beam emitted from the back of the laser 4063 to detect the optical power of the laser. Laser heat sink 4062 is used to dissipate heat from laser 4063.

A COC substrate 4061 is also provided above the laser heat sinks 4062, the COC substrate 4061 supporting 4 laser heat sinks 4062. Namely, 4 laser assemblies 4041 are arranged in parallel on the COC substrate 4061, and they can be adhered to the COC substrate 4061 by glue, and the 4 laser assemblies 4041 are supported and fixed by the COC substrate 4061.

A semiconductor refrigerator 406 is arranged between the bottom surface of the light emitting cavity 403 and the COC substrate 4061, that is, the bottom surface of the semiconductor refrigerator 406 is adhered to the bottom surface of the light emitting cavity 403, the top surface of the semiconductor refrigerator 406 is used for supporting and fixing two COC substrates 4061, and the two COC substrates 4061 are used for supporting and fixing 8 laser heat sinks 4062,1 laser heat sinks 4062 and 1 laser 4063. The heat generated by the laser 4063 is sequentially transferred to the laser heat sink 4062, the COC substrate 4061 and the semiconductor refrigerator 406, thereby effectively dissipating the heat of the laser 4063.

In the present embodiment, a pad is provided on the laser heat sink 4062, and a laser 4063 is provided on the pad. The laser driver 405 is provided with a corresponding bonding pad, the bonding pad on the laser heat sink 4062 and the bonding pad on the laser driver 405 can be connected by a gold wire, and the laser driver 405 sends a signal to the laser 4063 by the gold wire and the bonding pad to drive the laser 4063 to emit a laser beam.

To facilitate the light detector 4051 to receive the laser beam emitted from the back of the laser 4063, the present application places the light detector 4051 on the laser driver 405, and the light detector 4051 is disposed on the light path of the light emitted from the back of the laser 4063. In this embodiment, two laser drivers 405 are disposed in the light emitting cavity 403, each laser heat sink 4062 is provided with a bonding pad, four laser components 4041 corresponding to the first optical multiplexer 4043 are connected to the bonding pad on one laser driver 405 by gold wires, and four laser components 4041 corresponding to the second optical multiplexer 4044 are connected to the bonding pad on the other laser driver 405 by gold wires.

Fig. 17 is a schematic view illustrating an assembly of the optical detector 4051 and the laser driver 405 according to the embodiment of the present application, and fig. 18 is a schematic view illustrating a structure of the optical detector 4051 according to the embodiment of the present application. As shown in fig. 17 and 18, each laser driver 405 is provided with four optical detectors 4051, the laser driver 405 is further provided with a common anode electrode 4052, the common anode electrode 4052 is far away from the light incident surface of the optical detector 4051, and anodes of the four optical detectors 4051 are connected to the common anode electrode 4052 by gold wires.

Specifically, the optical detector 4051 includes a bottom surface, a top surface 4056, and a first side surface 4053, a second side surface 4054, a third side surface, and a fourth side surface connected to edge wires of the bottom surface and the top surface 4056, respectively, an anode 4059 and a cathode 4058 are disposed on the top surface 4056 of the optical detector 4051, the anode 4059 is electrically connected to the common anode electrode 4052 by a gold wire, the common anode electrode 4052 is connected to the flexible circuit board 420 by a gold wire, and the cathode 4058 of the optical detector 4051 is also connected to the flexible circuit board 420 by a gold wire.

In order to save space, the embodiment of the present application uses an oblique illumination type photo detector, that is, the second side 4054 of the photo detector 4051 is provided with an inclined surface 4055, the inclined surface 4055 is inclined from the second side 4054 to the first side 4053, and the length of the bottom surface of the photo detector 4051 is smaller than the length of the top surface 4056. The inclined surface 4055 is provided with a photosensitive surface 4057, and the photosensitive surface 4057 corresponds to the backlight surface of the laser 4063 and is configured to receive the laser beam emitted from the backlight surface of the laser 4063.

The photosensitive surface 4057 is disposed on the inclined surface 4055, i.e., the photosensitive surface 4057 is disposed obliquely, so that when a laser beam emitted from the back surface of the laser 4063 enters the photosensitive surface 4057, the laser beam enters the photodetector 4051 through the photosensitive surface 4057, and a part of the laser beam may be reflected on the photosensitive surface 4057. If the photosensitive surface 4057 is disposed perpendicular to the bottom surface of the optical detector 4051, when the laser beam is reflected by the photosensitive surface 4057, the reflected beam may return to the laser 4063 along the incident optical path of the laser beam, which may affect the laser emission performance of the laser 4063; when the photosensitive surface 4057 is obliquely arranged, when the laser beam is reflected on the photosensitive surface 4057, the reflected beam and the incident beam are arranged at a certain angle, and the reflected beam cannot return to the laser 4063 along the incident light path, so that the laser emission performance of the laser 4063 is ensured.

In this application embodiment, adopt oblique illumination formula photo detector, oblique illumination formula photo detector 4051 can realize fixing this oblique illumination formula photo detector 4051 welded on laser driver 405 owing to the height size is lower, also fixes on laser driver 405 with the common anodal electrode 4052 that four photo detector 4051's positive pole 4059 are connected jointly, so can save space, has avoided setting up the backup pad in photo detector 4051 below. The laser driver 405 can either be connected to the laser 4063 to drive the laser 4063 or support the fixed photodetector 4051 and the common anode electrode 4052.

In the embodiment of the present application, a ceramic transition block 411 is disposed between a bottom surface of the laser driver 405 and a bottom surface of the light emitting cavity 403, the laser driver 405 is disposed on the ceramic transition block 411, that is, the ceramic transition block 411 is used for supporting and fixing the laser driver 405, and a pad is disposed on one side of the ceramic transition block 411, and the other side is connected to the flexible circuit board 420. Common anode electrode 4052 on laser driver 405 is connected with the pad on ceramic switching piece 411 through the gold wire, negative pole 4058 on the optical detector 4051 is connected with the pad on ceramic switching piece 411 through the gold wire, the pad page or leaf on laser driver 405 is connected with the pad on ceramic switching piece 411 through the gold wire, the electrical signal that passes through ceramic switching piece 411 with flexible circuit board 420 conveying, signals such as work transfer to laser driver 405 respectively, optical detector 4051, laser instrument 4063 etc. realize the normal work of laser driver 405, optical detector 4051, laser instrument 4063 etc..

Fig. 19 is an assembly schematic diagram of a ceramic transition block 411 and a flexible circuit board 420 in an optical module according to an embodiment of the present disclosure. As shown in fig. 19, a side of the ceramic relay block 411 away from the laser assembly 4041 is provided with a boss 4114, the boss 4114 is connected to the flexible circuit board 420, a signal of the circuit board 300 is transmitted to the ceramic relay block 411 through the flexible circuit board 420, and the ceramic relay block 411 relays the signal to the laser driver 405, the optical detector 4051, the laser 4063, and the like. A first groove 4111, a second groove 4112 and a third groove 4113 are arranged on one side of the ceramic transition block 411, which is close to the laser component 4041, the second groove 4112 is arranged on the bottom surface of the third groove 4113, and the bottom surface of the second groove 4112 is recessed into the bottom surface of the third groove 4113; the first groove 4111 is disposed on a bottom surface of the second groove 4112, and the bottom surface of the first groove 4111 is recessed in the bottom surface of the second groove 4112. That is, the first groove 4111, the second groove 4112 and the third groove 4113 are disposed in a step shape, the first groove 4111 is recessed in the second groove 4112, and the second groove 4112 is recessed in the third groove 4113.

All be equipped with the pad on second recess 4112 and the third recess 4113, laser driver 405 places in first recess 4111, and the pad on the laser driver 405, the negative pole 4058 of light detector 4051, share anode electrode 4052 and be connected with the pad on second recess 4112, the third recess 4113 through the gold thread respectively to realize the switching of signal.

The bosses 4114 on one side of the ceramic transition block 411 may be connected to the circuit board 300 through two flexible circuit boards 420, that is, the upper side of the boss 4114 is connected to one flexible circuit board 420, and the lower side of the boss 4114 is connected to the other flexible circuit board 420, so as to transmit various signals.

Fig. 20 is an exploded schematic view of a ceramic transition block 411 and a light emitting housing 401 in an optical module according to an embodiment of the present disclosure. As shown in fig. 20, the bottom surface of the ceramic adapter block 411 contacts the bottom surface of the light emitting cavity 403, a plug hole 4011 is provided on the side of the light emitting housing 401 away from the first fiber adapter 410, and the ceramic adapter block 411 is inserted into the light emitting cavity 403 through the plug hole 4011.

Jack 4011 on light emitting housing 401 extends from a side remote from first fiber optic adapter 410 to a side adjacent first fiber optic adapter 410, and jack 4011 has a width dimension that is the same as the width dimension of light emitting housing 401. The bottom surface of the ceramic relay block 411 is in contact with the bottom surface of the light emission housing 401, and the top surface of the ceramic relay block 411 is in contact with the top surface of the jack 4011. Specifically, the bottom surface of the ceramic relay block 411 is soldered to the bottom surface of the light emission housing 401, and the top surface of the ceramic relay block 411 is soldered to the top surface of the insertion hole 4011, thereby achieving hermetic packaging of the light emission housing 401. When the ceramic adapter block 411 is welded to the light emission housing 401, one end of the ceramic adapter block 411 abuts against the inner side wall of the jack 4011, and the connection surfaces of the ceramic adapter block 411 and the boss 4114 can be flush with the end surface of the light emission housing 401.

A connecting block 4013 is arranged between one side of the light emitting housing 401 close to the first fiber optic adapter 410 and the first fiber optic adapter 410, one end of the connecting block 4013 is connected with the side wall of the light emitting housing 401, and the other end is connected with the first fiber optic adapter 410. Be provided with through-hole 4012 on the lateral wall that light transmission casing 401 and connecting block 4013 are connected, this through-hole 4012 and light transmission cavity 403 intercommunication, the compound light beam of light transmission device 404 transmission in the light transmission cavity 403 gets into connecting block 4013 through-hole 4012, and then gets into in first optic fibre adapter 410 through connecting block 4013.

Fig. 21 is a schematic structural diagram of a light emitting housing 401 in a light module according to an embodiment of the present application. As shown in fig. 21, the light emitting housing 401 is a housing with an opening at the upper end, a light emitting cover plate 402 is disposed at the opening at the upper end, and the light emitting cover plate 402 covers the opening of the light emitting housing 401 to realize the sealing assembly of the tosa 400. The light emitting cover plate 402 is sealed and welded with the light emitting housing 401 by a soldering machine, and the side of the light emitting housing 401 away from the first fiber adapter 410 seals the jack 4011 of the light emitting housing 401 by the ceramic transition block 411, so that the hermetic package of the light emitting housing 401 is realized.

One side of the connecting block 4013 is connected to the outer wall of the light emitting housing 401, and the thickness dimension of the connecting block 4013 is larger than the assembly thickness dimension of the light emitting housing 401 and the light emitting cover plate 402, that is, the top surface 4015 of the connecting block 4013 protrudes from the light emitting cover plate 402. When the light emitting cover plate 402 is sealed, the interference to the soldering machine will be generated, and the light emitting cover plate 402 and the light emitting housing 401 cannot be sealed completely. This application sets up on the top surface 4015 of connecting block 4013 and dodges recess 4014, and this dodge recess 4014's bottom surface can be sunken in the top surface of light emission apron 402, also can be parallel and level with the top surface of light emission apron 402.

Dodge the distance between recess 4014 and the lateral wall of transmitting light casing 401 on connecting block 4013 and can set up according to actual conditions to when guaranteeing that light emission apron 402 brazes, connecting block 4013 can not produce the interference to the brazing machine, connects light emission casing 401 and connecting block 4013 under the circumstances that does not influence parallel seal welding with the realization.

Fig. 22 is a partial cross-sectional view of a light transmitter sub-assembly 400 in a light module according to an embodiment of the present disclosure. As shown in fig. 22, the first optical fiber adapter 410 is connected to a connection block 4013, a light through hole 4016 penetrating the connection block 4013 is disposed in the connection block 4013, the light through hole 4016 is communicated with the light through hole 4016 and a through hole 4012 on a side wall of the light emitting housing 401, so that the composite light beam emitted from the light emitting device 404 in the light emitting cavity 403 sequentially enters the first optical fiber adapter 410 through the through hole 4012 and the light through hole 4016, and light emission is realized.

In the embodiment of the present application, a converging lens 409 is disposed between the second lens 4046 in the light emission cavity 403 and the fiber ferrule end face of the first fiber optic adapter 410, and the converging lens 409 is fixedly mounted in the connection block 4013. Specifically, one side of the connection block 4013, which is close to the first optical fiber adapter 410, is provided with a first mounting groove, the converging lens 409 is embedded in the first mounting groove, and the first mounting groove is communicated with the light through hole 4016, so that one path of composite light beam transmitted through the light through hole 4016 enters the converging lens 409 to be converged in the converging lens 409, and finally the composite light beam is converged and coupled to the optical fiber ferrule end face of the first optical fiber adapter 410.

A planar optical window 4048 is further disposed between the second lens 4046 and the converging lens 409 in the light emitting cavity 403, and the planar optical window 4048 is fixedly mounted in the connecting block 4013. Specifically, one side that connecting block 4013 and light emission shell 401 are connected is equipped with the second mounting groove, and plane light window 4048 inlays and locates in this second mounting groove, and this second mounting groove is linked together with logical unthreaded hole 4016, through-hole 4012, so the cavity 403 is sent out to the compound light beam of the same way that second lens 4046 jetted out shines plane light window 4048 in connecting block 4013 through-hole 4012, and plane light window 4048 allows compound light beam to permeate and get into in logical unthreaded hole 4016.

The planar optical window 4048 may also be fixedly mounted in the side wall of the light emitting housing 401 to which the connection block 4013 is attached. Specifically, be equipped with through-hole 4012 on the lateral wall that light emission casing 401 is connected with connecting block 4013, be equipped with the second mounting groove in this through-hole 4012, plane light window 4048 inlays and locates in this second mounting groove, so in the cavity 403 is sent out in the light composite light beam of the same way that second lens 4046 jetted out jets into plane light window 4048 via through-hole 4012, plane light window 4048 allows composite light beam to permeate into logical unthreaded hole 4016.

In the embodiment of the present application, the connection block 4013 and the light emitting housing 401 may be integrally formed or may be separate. When connecting block 4013 and the light emission casing 401 are the independent structure, the accessible glue of the side of connecting block 4013 is pasted on the outer wall of light emission casing 401, so set up and also conveniently install plane light window 4048 in the lateral wall of light emission casing 401 or in connecting block 4013.

The optical module provided by the embodiment of the application transmits 8-channel light beams with different wavelengths through 8 laser assemblies, converts the 8-channel light beams into 8-channel collimated light beams through the collimating lens, multiplexes the 8-channel light beams into 2-channel composite light beams sequentially through the first optical multiplexer and the second optical multiplexer, multiplexes the 2-channel composite light beams into 1-channel light beams through the first lens, the second lens and the third lens, and couples the 1-channel light beams into the first optical fiber adapter, so that the signal light with multiple wavelengths in a single optical fiber is transmitted simultaneously; in addition, in order to save space, the oblique illumination type optical detector with lower height and size is adopted to monitor the optical power of the laser assembly, the oblique illumination type optical detector and the common anode electrode are both arranged on the laser driver, the anode of the optical detector is connected with the common anode electrode through routing, the cathode of the optical detector is connected with the ceramic switching block through routing, the laser driver is connected with the ceramic switching block through routing, the ceramic switching block is connected with the flexible circuit board, and signals sent by the circuit board are transmitted to the photoelectric devices such as the laser driver, the laser assembly and the optical detector through the flexible circuit board and the ceramic switching block; and a parallel sealing welding process is adopted between the ceramic transfer block and the light emission shell, and between the light emission cover plate and the light emission shell, and an avoidance groove is arranged on the connecting block connected with the light emission shell, so that the first optical fiber adapter and the light emission shell are connected under the condition of not influencing the parallel sealing welding. Therefore, the optical fiber can realize the simultaneous transmission of signal lights with a plurality of wavelengths in a single optical fiber, and the occupied volume of the transmitter optical subassembly in the optical module is reduced, thereby being beneficial to the development of miniaturization of the optical module.

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 of the embodiments of the present application.

Claims

1. A light module, comprising:

a circuit board;

wherein, the transmitter optical subassembly includes:

a light emitting housing;

the plurality of optical multiplexers are arranged in the light emitting cavity, correspond to the plurality of laser component groups and are used for respectively multiplexing the multi-path light beams with different wavelengths into multi-path composite light beams;

the lens assembly is arranged in the light emission cavity and comprises a first lens, a second lens and a third lens, the first lens is arranged on an emergent light path of one optical multiplexer, the second lens is arranged on an emergent light path of the first lens, and the third lens is arranged on an emergent light path of the other optical multiplexer; an incident light surface of the second lens is provided with an angle selection film, the angle selection film is used for transmitting one path of composite light beam emitted by the first lens, reflecting the other path of composite light beam emitted by the third lens to the first lens, and transmitting the other path of composite light beam after the angle is adjusted through the first lens by means of reflection again, so that the multi-path composite light beam is multiplexed into one path of signal light;

2. The optical module of claim 1, wherein the optical multiplexer comprises:

the first optical multiplexer is arranged in the light emitting cavity and used for receiving the multi-path light beams emitted by the laser component group and multiplexing the multi-path light beams into a first composite light beam;

and the second optical multiplexer is arranged in the light emitting cavity and used for receiving the multi-path light beams emitted by the other laser component group and multiplexing the multi-path light beams into a second composite light beam.

3. The optical module of claim 2, wherein the first lens is disposed on an outgoing optical path of the first optical multiplexer, and the third lens is disposed on an outgoing optical path of the second optical multiplexer;

the first composite light beam emitted by the first optical multiplexer directly transmits through the first lens and the second lens in sequence;

the second composite light beam emitted by the second optical multiplexer is reflected to the second lens by the third lens, then reflected to the first lens again by the second lens, reflected to the second lens again by the first lens, and transmitted through the second lens.

4. The optical module according to claim 3, wherein a transflective film is disposed on an exit surface of the first lens, the first composite light beam is directly transmitted through the transflective film, and the reflected second composite light beam is reflected to the second lens again through the transflective film, so as to change an incident light angle of the second composite light beam;

a reflection film is arranged on an incident light surface of the third lens, and the second composite light beam is reflected to the second lens through the reflection film;

the first composite light beam is directly transmitted through the angle selection film, the second composite light beam reflected to the second lens is reflected to the semi-reflecting and semi-transmitting film of the first lens through the angle selection film, and the second composite light beam reflected to the angle selection film again through the semi-reflecting and semi-transmitting film is transmitted through the angle selection film.

5. The optical module of claim 4, wherein the first composite light beam transmitted through the first lens and entering the second lens and the second composite light beam reflected again through the first lens and entering the second lens are combined into one signal light in the second lens.

6. The optical module according to claim 5, wherein a converging lens is disposed between the first optical fiber adapter and the second lens, and configured to converge and couple one path of signal light emitted from the second lens to the first optical fiber adapter.

7. The optical module as claimed in claim 6, wherein a planar optical window is disposed between the second lens and the converging lens, the planar optical window is disposed in a sidewall of the light emitting housing, and a path of signal light emitted from the second lens is transmitted through the planar optical window.

8. The optical module of claim 2, wherein the tosa further comprises a plurality of collimating lenses, and the collimating lenses are disposed between the set of laser components and the optical multiplexer, and are configured to convert the plurality of light beams with different wavelengths emitted by the set of laser components into collimated light beams, respectively.

9. The optical module according to claim 8, wherein the light incident surfaces of the first optical multiplexer and the second optical multiplexer are provided with light incident ports, and the light incident ports are obliquely arranged and configured to receive the collimated light beams emitted by the collimating lens so as to multiplex the collimated light beams into two composite light beams.

10. The optical module of claim 8, wherein the tosa comprises two groups of laser assemblies, each group of laser assemblies comprising 4 laser assemblies; the light emission secondary module comprises 8 collimating lenses, and the laser assemblies are arranged in one-to-one correspondence with the collimating lenses.