CN216351373U - Optical module - Google Patents

Abstract

The application discloses an optical module, which comprises a shell, a circuit board assembly, an optical assembly and an optical socket; the shell comprises a first shell, a second shell and a fiber adapter, and the circuit board assembly comprises a hard circuit board; the optical assembly is fixed on the first shell and comprises an optical processing assembly and a photoelectric chip, wherein the optical processing assembly comprises a wavelength division multiplexer, a lens group and a lens group, the lens group is positioned between the wavelength division multiplexer and the photoelectric chip, and the lens group is positioned between the wavelength division multiplexer and an optical socket; the photoelectric chip is close to the hard circuit board and is electrically connected with the hard circuit board; the optical fiber adapter is arranged at the optical interface of the shell and integrally formed with the optical interface, and one end of the optical socket extends into the optical fiber adapter; the optical fiber adapter, the optical plug optical assembly and the hard circuit board are all in hard connection. All parts in the optical module are hard links, flexible connections such as an FPC (flexible printed circuit), an optical fiber or a movable head are not needed to absorb tolerance, the quantity of materials is reduced, the assembly process is simplified, the assembly is simpler and more convenient, and the cost can be effectively reduced.

Description

Optical module

Technical Field

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

Background

An optical module, which is a core device for photoelectric and electro-optical conversion in an optical communication system, generally includes a housing, a circuit board assembly disposed in the housing, and a light emitting assembly and/or a light receiving assembly. The shell is provided with an electrical interface and an optical interface, one end of a circuit board in the shell is an electrical connection end, the electrical connection end is electrically connected with the electrical interface in an optical cage of the optical communication host through the electrical interface, the optical interface is used for connecting external optical fibers, and optical transmission between the optical module and the optical module in the far-end optical communication host is realized through the external optical fibers.

As disclosed in the background of the optical module of chinese patent application No. 201410851476.6 published on 8/4/2015, the optical transmitter module and the optical receiver module in the conventional optical module are generally packaged as an optical transmit sub-module and an optical receive sub-module, and are electrically connected to the hard circuit board through the flexible circuit board, respectively, so as to realize signal transmission between the hard circuit board and the optical chips in the optical transmit sub-module and the optical receive sub-module. Alternatively, as disclosed in its embodiments, both the light emitting assembly and the light receiving assembly are assembled in the same sub-module, which is then electrically connected to the rigid circuit board by the flexible circuit board.

An optical module disclosed in a Chinese patent application optical module, published in 7/19/2017, with application number 201710590788.X, comprises a shell, a heat sink device arranged in the shell and connected with the shell in a heat conduction manner, a printed circuit board partially arranged on the heat sink device, and a laser chip and a detector chip arranged on the heat sink device, wherein the laser chip and the detector chip are both electrically connected with the circuit board. In order to absorb processing errors and assembly errors of a heat sink device, a circuit board and the like, the optical interface structure at one end of the shell needs to be a separate structure with the shell, namely a movable head, so that the assembly tolerance is improved by adjusting the optical interface structure (the movable head) in the assembly process.

However, in any packaging method, the laser chip, the detector chip, the wavelength division multiplexer/demultiplexer, the optical processing element such as a lens, and the like are assembled on a carrier, connected to a circuit board, and then assembled into the housing of the optical module. The above-mentioned packaging methods all have the following disadvantages: 1. the number of structural parts is large, the production process is complex, and the production flow is long; 2. the heat dissipation path of the device is long, and part of the heat dissipation path needs to use a low-thermal-conductivity material, so that the improvement of the working performance of the module in the full temperature range is influenced; 3. the occupation ratio of the invalid space in the module is high, which is not beneficial to the development of the miniaturization and high-density integration direction of the module; 4. the structure is changeable, and module assembly flow and manufacturing cost are higher, establish obstacle etc. to module batch application. The above problems affect the heat dissipation performance and the integration level of the optical module, and make the cost of the optical module high and difficult to reduce.

Disclosure of Invention

An object of this application is to provide an optical module, and the equipment is more convenient, is convenient for rework, can effectively reduce product cost.

In order to achieve one of the above objects, the present application provides an optical module including a housing, a circuit board assembly, an optical assembly, and an optical receptacle; the shell comprises a first shell, a second shell and an optical fiber adapter, and the first shell and the second shell are covered to form an internal accommodating cavity; the circuit board assembly and the optical assembly are arranged in the inner accommodating cavity; the circuit board assembly comprises a rigid circuit board;

the shell is provided with an electrical interface and an optical interface, and the circuit board assembly is fixed on the first shell and close to one end of the electrical interface;

the optical assembly is fixed on the first shell and comprises an optical processing assembly and a photoelectric chip, wherein the optical processing assembly comprises a wavelength division multiplexer, a lens group and a lens group, the lens group is positioned between the wavelength division multiplexer and the photoelectric chip, and the lens group is positioned between the wavelength division multiplexer and the optical socket; the optical processing assembly is used for optical transmission between the photoelectric chip and the optical socket, and the photoelectric chip is close to the hard circuit board and is electrically connected with the hard circuit board;

the optical fiber adapter is arranged at an optical interface of the shell, the optical fiber adapter and the optical interface are integrally formed, and one end of the optical socket extends into the optical fiber adapter; the optical fiber adapter, the optical socket, the optical assembly and the hard circuit board are all in hard connection.

As a further improvement of the embodiment, the fiber optic adapter is formed by integrally molding a part of the fiber optic adapter with the first housing and integrally molding a part of the fiber optic adapter with the second housing, and the first housing and the second housing are covered at the optical interface to form the fiber optic adapter; alternatively, the fiber optic adapter is integrally formed with the first housing.

As a further improvement of the embodiment, the circuit board assembly is fixed in the first housing by glue, fasteners and/or snaps.

As a further improvement of the embodiment, the optoelectronic chip includes a laser chip,

the laser chip is arranged on a substrate; the laser chip is electrically connected with the substrate;

the substrate is electrically connected with the hard circuit board through a bonding lead or an adapter plate, or the hard circuit board is electrically connected with the substrate in a lap joint manner.

As a further improvement of the implementation, the optical module further includes a transimpedance amplifier, the optical chip includes an optical detector chip, the optical detector chip is electrically connected to the transimpedance amplifier through a bonding wire, and the transimpedance amplifier is electrically connected to the hard circuit board through a bonding wire.

As a further improvement of the embodiment, the first housing includes a bottom plate, and the light processing assembly is directly fixed on the bottom plate through a glue layer.

As a further improvement of the embodiment, the optical module further includes an optical device carrier plate, and the optical processing module and the optoelectronic chip are disposed on the optical device carrier plate; the optical device carrier plate is fixed in the first shell.

As a further improvement of the embodiment, the optical device carrier has a first carrying surface, and the lens group between the wavelength division multiplexer and the optical receptacle is a third lens group fixed on the first carrying surface.

As a further refinement of the embodiment, the lens group between the wavelength division multiplexer and the optical receptacle is a third lens group; the optical socket comprises a sleeve assembly and an optical fiber ferrule, the optical fiber ferrule is arranged at one end, close to the optical processing assembly, in the sleeve assembly, and the other end, far away from the optical processing assembly, of the sleeve assembly is used for receiving the optical fiber ferrule of an external optical fiber when being connected with the external optical fiber;

the sleeve assembly is close to one end of the light processing assembly is provided with an extension structure, and the third lens group is installed on the extension structure.

As a further refinement of an embodiment, the optical receptacle is fixed within the first housing.

As a further improvement of the embodiment, the optical processing assembly comprises an emission end optical processing assembly and a receiving end optical processing assembly, the emission end optical processing assembly comprises the wavelength division multiplexer and a first periscope; the receiving end optical processing assembly comprises a wavelength division demultiplexer and a second periscope.

As a further refinement of the embodiment, the optical receptacle includes a transmitting-side optical receptacle and a receiving-side optical receptacle; the photoelectric chip comprises a laser chip and a light detector chip;

the laser chip, the wavelength division multiplexer and the optical socket of the receiving end are positioned on the same side in the first shell, and the optical detector chip, the wavelength division multiplexer and the optical socket of the transmitting end are positioned on the other side in the first shell;

the first periscope and the second periscope are overlapped with each other, the first periscope guides the optical signal output by the wavelength division multiplexer to one side of the transmitting end optical socket, and the second periscope guides the optical signal received by the receiving end optical socket into the wavelength division demultiplexer.

The beneficial effect of this application: all parts in the optical module are hard links, flexible connections such as an FPC (flexible printed circuit), an optical fiber or a movable head are not needed to absorb tolerance, the quantity of materials is reduced, the assembly process is simplified, the assembly is simpler and more convenient, and the cost can be effectively reduced.

Drawings

Fig. 1 is a schematic diagram of an optical cage of a conventional optical module and an optical communication host;

fig. 2 is a schematic structural diagram of an optical module in embodiment 1 of the present application;

FIG. 3 is an exploded view of the light module of FIG. 2;

FIG. 4 is a schematic structural diagram of an optical receptacle;

FIG. 5 is a schematic view of another configuration of an optical receptacle;

fig. 6 is a schematic structural diagram of an optical module in embodiment 2 of the present application;

fig. 7 is a schematic diagram of the optical module structure of embodiment 3 of the present application.

Detailed Description

The present application will now be described in detail with reference to specific embodiments thereof as illustrated in the accompanying drawings. These embodiments are not intended to limit the present application, and structural, methodological, or functional changes made by those skilled in the art according to these embodiments are included in the scope of the present application.

In the various illustrations of the present application, certain dimensions of structures or portions may be exaggerated relative to other structures or portions for ease of illustration and, thus, are provided to illustrate only the basic structure of the subject matter of the present application.

Also, terms used herein such as "upper," "above," "lower," "below," and the like, denote relative spatial positions of one element or feature with respect to another element or feature as illustrated in the figures for ease of description. The spatially relative positional terms may be intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "below" can encompass both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly. When an element or layer is referred to as being "on," or "connected" to another element or layer, it can be directly on, connected to, or intervening elements or layers may be present.

As shown in fig. 1, the optical module 200 is typically disposed in a pluggable manner in the optical cage 100 of the optical communication host. The optical module 200 generally includes a housing, a circuit board assembly disposed within the housing, and a light emitting assembly and/or a light receiving assembly. The housing is provided with an electrical interface 200a and an optical interface 200b, one end of the circuit board assembly in the housing is an electrical connection end, the electrical connection end (usually a gold finger) is electrically connected with the electrical interface in the optical cage 100 of the optical communication host through the electrical interface 200a, and the optical interface 200b is an optical fiber adapter for connecting an external optical fiber, and optical transmission between the optical module and the optical module at the far-end optical communication host is realized through the external optical fiber.

Example 1

As shown in fig. 2 and 3, the optical module of this embodiment includes a housing 210, a circuit board assembly 220, and an optical assembly including an optoelectronic chip 230 and a light processing assembly 240. The housing 210 includes a first housing 211 and a second housing 212, the first housing 211 and the second housing 212 are covered to form an inner accommodating cavity, and the housing 210 has an optical interface 200b and an electrical interface 200 a; the circuit board assembly 220, the optoelectronic chip 230 and the optical processing assembly 240 are disposed in the inner cavity of the housing 210.

In this embodiment, the circuit board assembly 220 includes a hard circuit board 221 (abbreviated as a circuit board), and electronic components (not shown), electrical chips such as a controller, a signal processor, a driver, a transimpedance amplifier, and the like, wherein the driver and the transimpedance amplifier may be disposed on the hard circuit board 221 or may not be disposed on the hard circuit board 221, and are disposed on the bottom plate 213 of the first housing 211 together with the optoelectronic chip. The rigid circuit board 221 is fixed on the first housing 211, and one end (electrical connection end 222) of the rigid circuit board 221 extends out of the electrical interface 200a for electrically connecting the electrical interface in the optical cage of the optical communication host. The hard circuit board 221 may be fastened, snapped, or adhesively fixed to the first housing 211 by a fastener such as a screw, or may be fastened, snapped, or adhesively fixed to the first housing 211 by a combination of a screw and a snap. In this embodiment, the hard circuit board 221 is fixed to the first housing 211 by screw fastening. Specifically, a carrier 216 for supporting the hard circuit board 221 is provided on the bottom plate 213 of the first housing 211, the carrier 216 is provided with a threaded hole 216a, a through hole 223 is provided at a position of the hard circuit board 221 corresponding to the threaded hole 216a, a screw is inserted into the threaded hole 216a through the through hole 223, and the hard circuit board 221 is fixed on the carrier 216 by a nut pressing the hard circuit board 221. In this embodiment, the carrier 216 is respectively located inside two sidewalls 215 of the first housing 211 for supporting two edges of the hard circuit board 221. In other embodiments, the carrier may also be disposed in the middle area of the first housing bottom plate for supporting the middle position of the rigid circuit board.

The first housing 211 includes a bottom plate 213 and sidewalls 215 respectively disposed on two sides of the bottom plate 213, the optical electrical chip 230 is disposed on the bottom plate 213, and the optical electrical chip 230 is electrically connected to the hard circuit board 221; the optical processing component 240 is disposed on the bottom plate 213 adjacent to the optical interface 200b, and the optical processing component 240 is used for optical transmission between the optoelectronic chip 230 and the optical interface 200 b.

In this embodiment, the optical module 200 is a transceiver optical module, the optoelectronic chip 230 includes a laser chip 231 and a photodetector chip 232, and the optical processing assembly 240 includes a transmitting end optical processing assembly and a receiving end optical processing assembly. The laser chip 231 is fixed on the bottom plate 213 of the first housing 211 through a substrate 236, and the substrate 236 is bonded or welded with the bottom plate 213; the laser chip 231 is electrically connected to the substrate 236, and the substrate 236 is electrically connected to the hard circuit board 221. Generally, the laser chip 231 is attached to the substrate 236 through a eutectic bonding process to form a coc (chip on carrier) structure, the laser chip 231 is electrically connected to the substrate 236 through a wire bonding (eutectic bonding) bonding wire, and the substrate 236 is electrically connected to the hard circuit board 221 through a bonding wire or an interposer, so as to electrically connect the hard circuit board 221 to the laser chip 231. In this embodiment, the substrate 236 is disposed on a semiconductor Cooler (TEC) 233, the temperature of the COC is controlled by the TEC233, and the other side of the TEC233 is fixed on the bottom plate 213 to directly dissipate heat through the bottom plate 213. In other embodiments, the substrate may be directly bonded to the base plate by an adhesive, and the substrate itself has an electrical isolation function to electrically isolate the substrate conductive layer and the laser chip from the first housing. Alternatively, an electrical isolation layer, such as an aluminum nitride thin film, may be disposed between the substrate and the bottom plate of the first housing to electrically isolate the laser chip from the first housing.

To shorten the signal transmission distance between the laser chip 231 and the rigid circuit board 221, the substrate 236 is usually located outside the rigid circuit board 221 and adjacent to the edge of the rigid circuit board 221. In this embodiment, the driver is disposed on the rigid circuit board 221, but in other embodiments, the driver may be disposed on the substrate.

In this embodiment, the hard circuit board 221 has an avoiding hole 224, and the photo detector chip 232 and the transimpedance amplifier 235 are disposed in the avoiding hole 224 and fixed on the bottom plate 213 of the first housing 211 at a position corresponding to the avoiding hole 224. An electrical isolation layer 234, such as an aluminum nitride thin sheet, is disposed on the bottom plate 213 corresponding to the avoiding hole 224, the optical detector chip 232 and the transimpedance amplifier 235 are bonded to the electrical isolation layer 234, the optical detector chip 232 is electrically connected to the transimpedance amplifier 235 through a bonding wire, the transimpedance amplifier 235 is electrically connected to the hard circuit board 221 through a bonding wire, and thus electrical connection between the optical detector chip 232 and the hard circuit board 221 is achieved. The avoiding hole 224 may be a square through hole in the hard circuit board 221, or a U-shaped through hole at the end or side of the hard circuit board 211. In other embodiments, the optical detector chip and the transimpedance amplifier may also be disposed outside the rigid circuit board and adjacent to the edge of the rigid circuit board, or the transimpedance amplifier may also be disposed on the rigid circuit board.

In optical communications, the optical module includes a main heat dissipation housing and a sub heat dissipation housing (a Top surface and a Bottom surface are defined in a multi-source agreement), and in this embodiment, the first housing 211 is the main heat dissipation housing of the optical module, and the second housing 212 is the sub heat dissipation housing. When the optical module is inserted into the optical cage of the optical communication host, the first housing 211 is close to the heat dissipation mechanism of the optical cage, and is a main area for heat dissipation between the optical module and the outside. The optoelectronic chip 230, such as the laser chip 231 and the substrate 236(COC structure) thereof, the optical detector chip 232, and the like, and the main power consumption chips, such as the transimpedance amplifier, the driver, and the like, are disposed on the bottom plate of the first housing 213, so that heat generated during operation can be directly and rapidly diffused from the first housing 213, and the heat dissipation path from the heat sink and the heat dissipation paste to the first housing in the prior art is faster and faster, and the heat dissipation performance of the optical module is effectively improved.

The optical module of this embodiment is a multi-channel optical transceiver module, and a transmitting end optical socket 260a and a receiving end optical socket 260b are disposed at the optical interface 200b of the housing 210. The emission end optical processing assembly includes a wavelength division multiplexer 241, a first collimating lens array (i.e., a first lens group) 271 is disposed between the wavelength division multiplexer 241 and the laser chip 231, and a first coupling lens group 250a is disposed between the wavelength division multiplexer 241 and the emission end optical receptacle 260 a. The multiple beams of light reflected by the multiple laser chips 231 are collimated by the collimating lenses of the first collimating lens array 271, and then enter the wavelength division multiplexer 241, and are combined into a beam of combined light by the wavelength division multiplexer 241, and the combined light is coupled into the emitting end optical socket 260a through the first coupling lens group 250a, and is transmitted into the external optical fiber through the emitting end optical socket 260 a. The receiving end optical processing assembly includes a wavelength demultiplexer 242, a second coupling lens array (i.e. a second lens group) 272 is disposed between the wavelength demultiplexer 242 and the photodetector chip 232, and a second collimating lens group 250b is disposed between the wavelength demultiplexer 242 and the receiving end optical socket 260b, where the first coupling lens group 250a and the second collimating lens group 250b form a third lens group 250, and are respectively located at ports of the transmitting end optical socket 260a and the receiving end optical socket 260 b. After receiving the composite optical signal transmitted by the external optical fiber, the receiving-end optical socket 26b transmits the received composite optical signal to the second collimating lens group 250b, the composite optical signal is collimated by the second collimating lens group 250b and then enters the wavelength demultiplexer 242, and is decomposed into multiple single-channel optical signals by the wavelength demultiplexer 242, each single-channel optical signal is coupled to the corresponding optical detector chip 232 by each coupling lens of the second coupling lens array 272, each optical detector chip 232 converts each single-channel optical signal into an electrical signal and transmits the electrical signal to the transimpedance amplifier 235, each electrical signal is amplified by the transimpedance amplifier 235 and then transmitted to the hard circuit board 221, and the electrical signal is processed by the signal processing unit on the hard circuit board 221 and then transmitted to the optical communication host by the electrical interface 200 a. In other embodiments, the wavelength division multiplexer and the wavelength division demultiplexer may be replaced by a Photonic Integrated Chip (PIC) or other optical waveguide Chip, and the Photonic Integrated Chip or the optical waveguide Chip is bonded to the bottom plate of the first housing of the optical module by welding or a thermal conductive adhesive.

In this embodiment, taking a dual-port optical module as an example, that is, one transmitting port and one receiving port, the first coupling lens group 250a is a coupling lens, and the second collimating lens group 250b is a collimating lens. In the optical module with more than two ports, for example, two transmitting ports and two receiving ports, the first coupling lens is two coupling lenses corresponding to the two transmitting ports, respectively, and the second collimating lens group is two collimating lenses corresponding to the two receiving ports, respectively. Of course, in other embodiments, the optical module may also be a bidirectional transmission optical module that is transceived through a single port, and in this case, the third lens group is a single lens and is configured to couple the transmission optical signal into the optical receptacle and collimate the optical signal received by the optical module to the optical processing component at the receiving end.

In this embodiment, the optical processing assembly further includes an optical path deflecting prism (periscope) 260, and the emission-side optical processing assembly is provided with a first periscope 243a between the wavelength division multiplexer 241 and the first coupling lens group 250a for adjusting an optical path between the wavelength division multiplexer 241 and the first coupling lens group 250a and the emission-side optical receptacle 260 a. The receiving end optical processing assembly is provided with a second periscope 243b between the second collimating lens group 250b and the wavelength division demultiplexer 242, for adjusting the optical path between the receiving end optical socket 260b and the second collimating lens group 250b and the wavelength division demultiplexer 242. In order to achieve more reasonable layout of the transmitting end optical assembly and the receiving end optical assembly in the optical module and the design of the high-speed signal line of the circuit board assembly, and simultaneously meet the requirement of the MSA (multi-source agreement), in this embodiment, the transmitting end optical assembly such as the laser chip and the wavelength division multiplexer in the optical module housing and the optical socket of the receiving end are located on the same side (namely, the left side or the right side facing the optical interface) in the first housing, and the receiving end optical assembly such as the optical detector chip and the wavelength division demultiplexer and the optical socket of the transmitting end are located on the other side in the first housing. The first periscope 243a and the second periscope 243b are overlapped with each other, the first periscope 243a guides the optical signal output by the wavelength division multiplexer to the side of the transmitting-end optical socket 260a on the different side of the wavelength division multiplexer, and the second periscope 243b guides the optical signal received by the receiving-end optical socket 260b to the wavelength division demultiplexer on the different side of the receiving-end optical socket 260 b. In this way, as long as the inclination angle of the periscope 243 relative to the base plate 211 of the first housing 210 is designed as required, the light path can be guided to a corresponding height, so that the layout design in the optical module housing is more flexible. Moreover, the length of the periscope can be lengthened by the design, so that the periscope is convenient to manufacture and the optical path is convenient to couple.

In this embodiment, the light processing assembly is adhered to the bottom plate 213 of the first housing 211 by an adhesive layer. At the emitting end, the first collimating lens array 271 is disposed on the TEC233 or the electrical isolation layer, the wavelength division multiplexer 241 and the first periscope 243a of the emitting end are directly bonded to the base plate 213 through a glue layer (not shown in the figure), and the thickness of the glue layer is adjusted according to the optical path, so that the wavelength division multiplexer 241 and the first periscope 243a are aligned with each other and are aligned with the front and rear optical paths, respectively. At the receiving end, the optical detector chip 232 is a surface receiving chip, a reflector is disposed above the optical detector chip 232, the second coupling lens array 272 and the reflector are disposed above the optical detector chip 232 together, and the optical signals output by the wavelength division demultiplexer 242 are respectively reflected and coupled to the optical detector chips 232. In other embodiments, the second coupled lens array may be replaced with a single large lens. The wavelength demultiplexer 242 and the second periscope 243b of the receiving end are also directly bonded to the base plate 213 through a glue layer, and the thickness of the glue layer is adjusted according to the optical path, so that the wavelength demultiplexer 243 and the second periscope 243b are aligned with each other and are aligned with the front and rear optical paths, respectively.

The optical module directly uses the optical module shell as a carrier to bear the optical processing assembly and the main power consumption chip, saves a heat sink bearing the photoelectric chip and a carrier plate bearing the optical processing assembly, reduces structural members in the optical module, optimizes an assembly process, reduces the cost, reduces the duty of an invalid space, improves the utilization rate of the effective space in the optical module, and has higher integration level.

In this embodiment, the bottom plate 213 of the first housing 211 includes a first mounting region 217 and a second mounting region 218, the above-described hard circuit board 221 is fixed to the first mounting region 217, and the laser chip 231 and the optical processing component are fixed to the second mounting region 218. The first housing 211 has a first reference, and the optical processing assembly is fixed on the second mounting region 218 at a first predetermined position based on the first reference. Here, the first reference may be a mark provided in the second mounting region 218, or an interface between a port and a sidewall of the first housing 211, or a stopper structure in the first housing 211, or the like. In this embodiment, the second mounting region 218 is provided with a periscope positioning groove, a wavelength division multiplexer limiting groove, a wavelength division demultiplexer limiting groove, and the like according to the optical path design. In other embodiments, the second mounting region may also be a plane on which optical elements such as periscopes, wavelength division multiplexers and demultiplexers are mounted, the optical elements being aligned by adjusting the thickness of the glue layer between the optical elements and the plane. Or the second mounting area comprises a plurality of mounting platforms with different heights, the mounting platforms are respectively used for mounting the periscope, the wavelength division multiplexer, the wavelength division demultiplexer, the photoelectric chip and the like, and one end of the hard circuit board close to the photoelectric chip can be fixed on the mounting platform of the first mounting area of the bottom plate for bearing the photoelectric chip in an adhesive mode. The structure has lower requirements on the processing precision of the first mounting area and the second mounting area, and the processing cost of the shell can be effectively reduced.

When assembled, the optical receptacle 260, the optical processing assembly 240, the optical electrical chip 230 and the circuit board assembly 220 are mounted in the first housing 211 with reference to the first housing 211 of the optical module, and the optical electrical chip 230 and the hard circuit board 221 are electrically connected by wire bonding (e.g., gold wire bonding) or an adapter plate between the optical electrical chip 230 and the hard circuit board 221. By adjusting the third lens group 250 to couple the optical signal between the optical processing assembly 240 and the optical receptacle 260; the first collimating lens array (first lens group) 271 is adjusted to collimate the optical signal emitted by the laser chip 231 and then the collimated optical signal is incident on the optical processing assembly 240, and the second coupling lens array (second lens group) 272 is adjusted to couple each optical signal output by the optical processing assembly 240 to each photodetector chip 232. All the components are installed by taking the optical module shell as a reference, and the third lens group can be adjusted to absorb the assembly tolerance among the optical processing component, the photoelectric chip and the circuit board, so that the optical interface of the shell does not need to be adjusted, the optical interface of the shell can be integrally formed with the first shell, and the all-hard connection among all the components in the optical module is realized. The hard circuit board, the photoelectric chip, the optical processing assembly and the optical socket are all in hard connection in the shell, assembly tolerance is not required to be absorbed by a flexible circuit board or an optical fiber, an optical interface is not required to be set as a movable head, and the structure of the optical module is further simplified. In addition, the optical socket, the optical processing assembly, the laser chip, the optical detector chip, the circuit board assembly and the like are arranged in the first shell by taking the optical module shell (the first shell) as a reference, so that the production and assembly process flow is simplified, the production efficiency can be further improved, and the cost is reduced. Meanwhile, more space is saved around each device, more important components can be configured, the layout in the module is further optimized, the integration level is improved, and the miniaturization packaging of the high-speed optical module is favorably realized.

As shown in fig. 4, the optical receptacle 260 (the transmitting-side optical receptacle and the receiving-side optical receptacle) employed in this embodiment includes a ferrule assembly 261 and a fiber stub 262, the fiber stub 262 being disposed within the ferrule assembly 261. Wherein the sleeve assembly 261 has a first end 263 and a second end 264 therethrough, the first end 263 for coupling with an optical processing assembly in the optical module and the second end 264 for connecting with an external optical fiber. The fiber stub 262 is disposed within a section of the ferrule assembly 261 adjacent the first end 263, a section of the ferrule assembly 261 adjacent the second end 264 is configured to receive the fiber stub of the external optical fiber when connected to the external optical fiber, and an end face of the fiber stub 262 facing the second end 264 is configured to mate with a stub of an external fiber optic connector. The first end 263 of the sleeve assembly 261 is provided with an extension 265 extending along the axial direction of the optical receptacle 260, and the extension 265 has an open mounting surface 265a, and the mounting surface 265a is used for mounting a lens (such as the third lens group mentioned above), namely, the first coupling lens at the emitting end or the second collimating lens at the receiving end, so that the lens is located in the optical path transmitted by the optical receptacle. In other embodiments, the mounting surface 265a may also be used to mount other passive optical components such as isolators or filters. The third lens group may be fixed on the mounting surface 265a by welding or gluing. By open mounting surface 265a is meant that the mounting surface 265a has an opening in the radial direction of the sleeve assembly 261 to facilitate adjustment and fixation of the lens during coupling. In this embodiment, the mounting surface 265a is a bearing plane located below the core extension of the fiber stub 262 for bearing the lens. In other embodiments, the mounting surface may be located at other positions on the side of the extended line of the fiber core of the fiber stub 262, and may be a plane or other shapes, such as an L-shaped surface, a U-shaped surface, an arc-shaped surface, a V-shaped surface, etc., so as to facilitate the adjustment and fixation of the lens. That is, the mounting surface is located outside and toward the core extension of the optical fiber ferrule to give way to an optical transmission path so that the light passing surface of the external optical element fixed on the mounting surface is aligned with the optical fiber core. In this embodiment, the extension structure and the sleeve assembly are integrally formed, and the outer contour of the extension structure is an extension of the outer contour of the first end of the sleeve assembly. In other embodiments, the extension structure may also be welded or bonded to the sleeve assembly.

The third lens group is arranged on the extending structure integrated with the optical socket, so that the problem that the optical socket generates light due to displacement such as stress displacement or aging creep deformation is avoided, and the reliability of the optical module is effectively improved. And in the assembling process, the light path coupling between the optical socket and the optical processing assembly can be conveniently realized by adjusting the third lens group, and the lens is fixed on the extension structure after the adjustment is finished, so that the light path coupling difficulty is reduced. In this embodiment, the extension 265 is integrally formed with the sleeve assembly 261, but in other embodiments, the extension may be integrally fixed with the sleeve assembly by welding or bonding.

As shown in fig. 3, in this embodiment, a receiving groove 214 is disposed at the optical interface 200b of the optical module 200, and the optical receptacle 260 is disposed in the receiving groove 214. This holding groove 214 is equipped with first limit structure, is equipped with second limit structure 266 on the light socket 260, and first limit structure and second limit structure 266 cooperate the position of injecing light socket 260 in holding groove 214. In this embodiment, the optical interface 200b and the first housing 211 are integrally formed, and the optical receptacle 260 can be fixed in the receiving groove 214 by gluing or welding, or can be fixed in the receiving groove 214 by other methods such as snapping or screw locking. The first limiting structure may be a first protrusion or a recess, such as a protrusion or a flange, in the first housing 211, and the second limiting structure 266 may be a second protrusion, such as a protrusion or a flange, on the outer circumference of the sleeve assembly 261. When assembled, the second protrusion abuts against the first protrusion to define the position of the optical receptacle 260 in the length direction of the optical module 200.

As shown in fig. 5, another embodiment of the optical receptacle is provided, and the optical module may also adopt the optical plug of this embodiment, and the optical plug is assembled in the optical module in the same manner as the optical receptacle of the above embodiment. The optical receptacle 260 of this embodiment also includes a ferrule assembly 261 and a fiber stub 262. The fiber stub 262 is disposed within the ferrule assembly 261. Wherein the ferrule assembly 261 has a first end 263 and a second end 264, the first end 263 for coupling with an optical processing assembly in the optical module and the second end 264 for connecting with an external optical fiber. The fiber stub 262 is disposed within the ferrule assembly 261 proximate the first end 263 and a section of the ferrule assembly 261 proximate the second end 264 is configured to receive the fiber stub of the external optical fiber when coupled thereto. In this embodiment, an optical window 267 is disposed at the end of the ferrule assembly 261 at the first end 263 of the optical receptacle 260 to enclose the optical fiber core 262 in the ferrule assembly 261 and to effectively seal the end face of the optical fiber core 262. In other embodiments, the optical lite may be affixed directly to the ferrule end face of the fiber ferrule adjacent the first end. In this embodiment, the optical window 267 is an optical flat sheet, such as a glass sheet, and an anti-reflection film may be disposed on a light-passing surface of the optical flat sheet to reduce surface reflection.

The optical receptacle ferrule assembly of this embodiment may be a ferrule assembly of a conventional optical receptacle, i.e. a ferrule assembly without an extension structure, or a ferrule assembly with an extension structure in the above-mentioned embodiment may be adopted, and the optical window is also disposed at a port of the ferrule assembly adjacent to the third lens group.

Example 2

As shown in fig. 6, for another optical module 300 provided in the present application, the optical module 300 of this embodiment includes a housing 310, a circuit board assembly 320, and an optical assembly. The optical assembly includes an optical device carrier 380, an optoelectronic chip 330, and a light management assembly 340. The housing 310 includes a first housing 311 and a second housing 312, the first housing 311 and the second housing 312 are covered to form an inner accommodating cavity, and the optical module 300 has an optical interface 300b and an electrical interface 300 a; the circuit board assembly 320, the optical device carrier 380, the optoelectronic chip 330 and the optical processing assembly 340 are disposed in the internal cavity of the housing 310.

In this embodiment, the optical device carrier 380 is a heat sink, typically a thermally conductive metal, and the optoelectronic chip 330 and the optical processing assembly 340 are disposed on the optical device carrier 380. In other embodiments, the optical device carrier may also include a first carrier and a second carrier that are bonded together in a lap joint fixing manner or a butt joint fixing manner, wherein the first carrier is a heat sink, and the second carrier is a carrier made of a material having a thermal expansion coefficient close to or equal to that of the optical processing assembly, that is, the thermal expansion coefficient of the second carrier is matched with that of the optical processing assembly. The photoelectric chip is arranged on the first carrier plate, and the optical processing assembly is arranged on the second carrier plate, so that the problem that light falls off when the environmental temperature changes greatly due to too large difference of thermal expansion coefficients of the optical device carrier plate and the optical processing assembly is solved. The optical device carrier 380 carrying the optoelectronic chip 330 and the optical processing assembly 340 is fixed in the first housing 310 by thermal adhesive bonding or soldering.

The circuit board assembly 320 includes a hard circuit board 321, and electronic components, electrical chips, etc., where the electrical chips include a controller, a signal processor, a driver, a transimpedance amplifier, etc., and the driver and the transimpedance amplifier may be disposed on the hard circuit board 321 or not on the hard circuit board, but on the optical device carrier along with the optical electrical chip. The rigid circuit board 321 is fixed on the first housing 311, and one end (electrical connection end 322) of the rigid circuit board 321 extends out of the electrical interface 300a for electrically connecting the electrical interface in the optical cage of the optical communication host. The end face of the end of the hard circuit board 321 near the optical electrical chip 330 abuts against the substrate of the optical electrical chip or the transimpedance amplifier, and is not fixed to the optical device carrier 380. Alternatively, an end surface of the hard circuit board 321 near one end of the optical electrical chip 330 abuts against an end surface of the optical device carrier 380, and does not overlap with the optical device carrier 380. The hard circuit board 321 may be fastened, snapped, or adhesively fixed to the first housing 311 by a fastener such as a screw, or may be fastened, snapped, or adhesively fixed to the first housing 311 by a fastener such as a screw. The optical device carrier plate 380 and the circuit board assembly 320 are respectively mounted and placed on the first housing 311 and are respectively fixed in the first housing 311, and the optical device carrier plate 380 and the hard circuit board 321 do not need to be fixed to each other, so that the assembly mode of the optical module is more flexible, the production and assembly process flow is simplified, rework is facilitated, the production efficiency can be further improved, and the cost can be reduced. Specifically, in the embodiment, the hard circuit board is fixed in the same manner as in embodiment 1, a through hole 323 is provided in the hard circuit board 321, and a screw is screwed into a threaded hole of the first housing 311 through the through hole 323 to lock the hard circuit board 321 in the first housing 311.

As in embodiment 1, the optical module in this embodiment is a transceiver optical module, the optoelectronic chip 330 includes a laser chip 331 and a photodetector chip 332, the optical processing component 340 includes a transmitting end optical processing component and a receiving end optical processing component, and both the transmitting end optical path and the receiving end optical path are the same as those in embodiment 1. The assembly structure of the optical device carrier 380 with the optical electrical chip 330 and the optical processing assembly 340 is the same as that of the optical electrical chip and the optical processing assembly in embodiment 1, and the electrical connection between the optical electrical chip 330 and the circuit board assembly 320 is the same as that in embodiment 1, which is not described herein again. In this embodiment, the optical processing assembly 340 is adhered to the optical device carrier 380 by an adhesive layer, and the optical device carrier 380 is adhered or welded to the first housing 311 by a heat conducting adhesive. Similarly, the rigid circuit board 321 has an avoiding hole 324, and the optical detector chip 332 and the transimpedance amplifier are disposed in the avoiding hole 324 and fixed on the optical device carrier 380 at a position corresponding to the avoiding hole 324.

In this embodiment, the bottom plate 313 of the first housing 311 also includes a first mounting region 314 and a second mounting region 315, the above-mentioned rigid circuit board 321 is fixed to the first mounting region 314, and the optical device carrier 380 on which the optoelectronic chip 330 and the optical processing assembly 340 are mounted is fixed to the second mounting region 315. The first housing 311 has a first reference, and the optical device carrier 380 on which the optoelectronic chip 330 and the optical processing assembly 340 are mounted is fixed on the second mounting region 315 at a first predetermined position with reference to the first reference. Here, the first reference may be a mark provided in the second mounting region 315, or an interface between a port and a sidewall of the first housing, or a stopper structure in the first housing, etc.

The optical device carrier 380 has a second reference, and each optical element of the optical processing assembly 340 is fixed on the optical device carrier 380 at a second, third, and other predetermined positions based on the second reference by bonding via an adhesive layer. The second reference may be a mark or a limiting structure disposed on the optical device carrier 380, or a corner of the end of the optical device carrier 380. In this embodiment, the optical device carrier 380 is provided with a periscope positioning slot, a wavelength division multiplexer limiting slot, a wavelength division demultiplexer limiting slot, and the like according to the optical path design. In other embodiments, the optical device carrier may be a plane on which optical elements such as periscope, wavelength division multiplexer and wavelength division demultiplexer are mounted, and the optical elements are aligned by adjusting the thickness of the glue layer between the optical elements and the plane. Or the optical device carrier plate is provided with a plurality of mounting platforms with different heights, and the mounting platforms are respectively used for mounting the periscope, the wavelength division multiplexer, the wavelength division demultiplexer, the photoelectric chip and the like. The structure has lower precision requirement on the bearing surface of the optical device carrier plate 380 for bearing the optical processing assembly 340 and the optoelectronic chip 330, and can effectively reduce the processing cost of the optical device carrier plate.

The optical module of this embodiment may adopt the same optical receptacle as that in embodiment 1, and the optical receptacle may be fixed at the optical interface of the housing as in embodiment 1, or may be fixed on the optical device carrier board. Taking the optical receptacle fixed on the optical device carrier as an example, the end of the optical device carrier 380 near the optical interface 300b is provided with a receptacle mounting portion 381, and the optical receptacle 360 is welded, glued, screwed or clamped on the mounting portion 381. The socket mounting portion 381 may be a sidewall formed at an end of the optical device carrier 380, and the sidewall is provided with a socket receiving groove 382 for mounting the optical socket 360. The mounting and positioning manner of the optical receptacle 360 on the optical device carrier plate 380 may be the same as that of the optical receptacle in the first housing in embodiment 1, and will not be described herein.

During assembly, the optical interposer 360 and the optical processing assembly 340 are passively mounted on the optical device carrier 380, and the third lens assembly 350 is adjusted to couple the optical signal between the optical processing assembly 340 and the optical receptacle 360. The optoelectronic chip 330 is also passively mounted on the optics carrier plate 380 or on a separate heat sink. The circuit board assembly 320 and the optical device carrier plate 380 carrying the optoelectronic chip 330 and the optical processing assembly 340 are respectively mounted and fixed in the first housing 311 by taking the first housing 311 as a reference, and the optical device carrier plate 380 and the hard circuit board 321 do not need to be fixed to each other. The optoelectronic chip 330 and the hard circuit board 321 are electrically connected by a wire bonding (e.g. gold wire) between the optoelectronic chip 330 and the hard circuit board 321, the first collimating lens array (the first lens group 371) is adjusted to collimate the optical signal emitted by the laser chip 331 and then to be incident on the wavelength division multiplexer, and the second coupling lens array (the second lens group 372) is adjusted to couple each optical signal output by the wavelength division multiplexer to each photodetector chip 332. The circuit board assembly 320 and the optical device carrier 380 are both mounted with the first housing 311 of the optical module 300 as a reference, and the lens assembly can be adjusted to absorb the assembly tolerance among the optical processing assembly 340, the optoelectronic chip 330, and the circuit board assembly 320, so that the optical interface of the housing does not need to be adjusted, and the optical interface 300b of the housing 310 can be integrally formed with the first housing 311, thereby realizing the full hard connection among all the components in the optical module. The structure does not need a flexible circuit board to absorb assembly tolerance, and does not need to set the optical interface as a movable head, thereby further simplifying the structure of the optical module, simplifying the production and assembly process flow, further improving the production efficiency and reducing the cost.

Example 3

As shown in fig. 7, for another optical module 400 provided in the present application, the optical module 400 of this embodiment includes a housing 410, a circuit board assembly 420, and an optical assembly. The optical assembly includes a photo chip 430 and a light processing assembly 440. The housing 410 includes a first housing 411 and a second housing 412, the first housing 411 and the second housing 412 are covered to form an inner accommodating cavity, and the optical module 400 has an optical interface 400b and an electrical interface 400 a; the circuit board assembly 420, the optoelectronic chip 430 and the optical processing assembly 440 are disposed in the inner cavity of the housing 410.

In this embodiment, the optoelectronic chip 430 includes a laser chip 431, the laser chip 431 is mounted on a substrate 432, the laser chip 431 is electrically connected to the substrate 432, and the laser chip 431 and the substrate 432 are electrically connected by a gold wire bonding process. The circuit board assembly 420 includes a hard circuit board 421 and electronic components or integrated circuit chips, such as a Digital Signal Processor (DSP)422, provided on the hard circuit board 421. In this embodiment, the substrate 432 is partially overlapped with the hard circuit board 421, that is, the substrate 432 overlaps the hard circuit board 421, and the surface of the substrate 432 of the overlapped portion is provided with an electrical connection end, and the surface of the hard circuit board 421 is also provided with an electrical connection end, and the electrical connection ends on the substrate 432 and the hard circuit board 421 are conductively connected and fixed together by Flip-chip (Flip-chip) or anisotropic conductive Adhesive (ACF) or other processes, so as to realize direct hard connection of the circuit board assembly 420 to the optoelectronic chip 430.

In this embodiment, the substrate 432 is thermally connected to the first housing 411 through a heat sink 433, and heat generated by the operation of the laser chip 431 is transferred to the first housing 411 through the substrate 432 and the heat sink 433, and dissipated through the first housing 411. The optical processing assembly 440 is disposed on the optical device carrier 450, and the optical processing assembly 440 may include a wavelength division multiplexer, a periscope, a coupling lens, and the like. The optical processing assembly 440 and the structure between the optical processing assembly and the optical receptacle are similar to those in embodiment 1 or 2, and the hard connection between the optoelectronic chip 430 and the optical interface 400b can be realized, so that the full hard connection between all the assemblies in the optical module can be realized, a flexible circuit board is not needed to absorb assembly tolerance, and the optical interface is not needed to be set as a movable head, so that the structure of the optical module is further simplified, the production and assembly process flow is simplified, the production efficiency is further improved, and the cost is reduced.

Since the electrical connection end of the hard circuit board 421 is directly connected to the electrical connection end of the substrate 432, the electrical connection end of the circuit board 421, the DSP422 and the high-speed signal transmission line connecting the two can be disposed on the same surface of the hard circuit board 421 opposite to the substrate 432, for example, on the surface of the hard circuit board 421 facing the main heat dissipation housing (here, the first housing 411), the DSP422 is connected to the first housing 411 through a heat dissipation pad 460 in a heat conduction manner, and the generated heat is directly transmitted out through the first housing 411. The electrical connection terminals of the laser chip 431 and the substrate 432 are on the same surface of the substrate 432, and are located on a side of the substrate 432 opposite to the first housing 411, and the back surface of the substrate 432 faces the first housing 411, and is connected with the first housing 411 through a heat sink 433 in a heat dissipation manner. Therefore, the high-speed signal transmission line from the DSP422 to the photoelectric chip 430 does not need to pass through a conductive via hole or a gold wire for bonding, and even does not need adapter plate switching, so that the impedance mutation of the high-speed signal transmission line is reduced, the high-frequency performance of the assembly can be effectively improved, and the bandwidth of the assembly is greatly improved. Meanwhile, the main power consumption devices in the optical module: the heat generated by the laser chip 431 and the DSP422 during operation can be directly transferred from the first housing 411 (i.e., the main heat dissipation housing) of the housing 410, so that the heat dissipation performance of the optical module can be further improved.

In other embodiments, a semiconductor cooler (TEC) may be disposed between the substrate 432 and the heat sink 433, so as to further improve the heat dissipation efficiency of the laser chip 431. The heat sink 433 and the optical device carrier 450 may be formed integrally; alternatively, the substrate 432 and the optical processing assembly 440 are directly adhered to the first housing 411 by gluing, and a heat sink or an optical device carrier plate is omitted.

The above list of details is only for the concrete description of the feasible embodiments of the present application, they are not intended to limit the scope of the present application, and all equivalent embodiments or modifications that do not depart from the technical spirit of the present application are intended to be included within the scope of the present application.

Claims (12)

1. An optical module includes a housing, a circuit board assembly, an optical assembly, and an optical receptacle; the shell comprises a first shell, a second shell and an optical fiber adapter, and the first shell and the second shell are covered to form an internal accommodating cavity; the circuit board assembly and the optical assembly are arranged in the inner accommodating cavity; the circuit board assembly comprises a rigid circuit board; the method is characterized in that:

the shell is provided with an electrical interface and an optical interface, and the circuit board assembly is fixed on the first shell and close to one end of the electrical interface;

the optical assembly is fixed on the first shell and comprises an optical processing assembly and a photoelectric chip, wherein the optical processing assembly comprises a wavelength division multiplexer, a lens group and a lens group, the lens group is positioned between the wavelength division multiplexer and the photoelectric chip, and the lens group is positioned between the wavelength division multiplexer and the optical socket; the optical processing assembly is used for optical transmission between the photoelectric chip and the optical socket, and the photoelectric chip is close to the hard circuit board and is electrically connected with the hard circuit board;

the optical fiber adapter is arranged at an optical interface of the shell, the optical fiber adapter and the optical interface are integrally formed, and one end of the optical socket extends into the optical fiber adapter; the optical fiber adapter, the optical socket, the optical assembly and the hard circuit board are all in hard connection.

2. The optical module of claim 1, wherein:

the optical fiber adapter is formed by integrally molding a part of the optical fiber adapter and the first shell and integrally molding a part of the optical fiber adapter and the second shell, and the first shell and the second shell are covered at the optical interface to form the optical fiber adapter; alternatively, the fiber optic adapter is integrally formed with the first housing.

3. The optical module of claim 1, wherein:

the circuit board assembly is fixed in the first shell through glue, fasteners and/or buckles.

4. The optical module of claim 1, wherein:

the optoelectronic chip comprises a laser chip,

the laser chip is arranged on a substrate; the laser chip is electrically connected with the substrate;

the substrate is electrically connected with the hard circuit board through a bonding lead or an adapter plate, or the hard circuit board is electrically connected with the substrate in a lap joint manner.

5. The optical module of claim 1, wherein: the optical module further comprises a transimpedance amplifier, the photoelectric chip comprises an optical detector chip, the optical detector chip is electrically connected with the transimpedance amplifier through a bonding lead, and the transimpedance amplifier is electrically connected with the hard circuit board through the bonding lead.

6. The optical module of claim 1, wherein:

the first shell comprises a bottom plate, and the light processing assembly is directly fixed on the bottom plate through a glue layer.

7. The optical module of claim 1, wherein:

the optical assembly further comprises an optical device carrier plate, and the optical processing assembly and the photoelectric chip are arranged on the optical device carrier plate; the optical device carrier plate is fixed in the first shell.

8. The light module of claim 7, wherein: the optical device carrier plate is provided with a first bearing surface, a lens group between the wavelength division multiplexer and the optical socket is a third lens group, and the third lens group is fixed on the first bearing surface.

9. The optical module of claim 1, wherein: a lens group between the wavelength division multiplexer and the optical socket is a third lens group; the optical socket comprises a sleeve assembly and an optical fiber ferrule, the optical fiber ferrule is arranged at one end, close to the optical processing assembly, in the sleeve assembly, and the other end, far away from the optical processing assembly, of the sleeve assembly is used for receiving the optical fiber ferrule of an external optical fiber when being connected with the external optical fiber;

the sleeve assembly is close to one end of the light processing assembly is provided with an extension structure, and the third lens group is installed on the extension structure.

10. The optical module of claim 1, wherein: the optical receptacle is fixed in the first housing.

11. The optical module of claim 1, wherein: the optical processing assembly comprises an emitting end optical processing assembly and a receiving end optical processing assembly, and the emitting end optical processing assembly comprises the wavelength division multiplexer and a first periscope; the receiving end optical processing assembly comprises a wavelength division demultiplexer and a second periscope.

12. The light module of claim 11, wherein:

the optical socket comprises a transmitting end optical socket and a receiving end optical socket;

the photoelectric chip comprises a laser chip and a light detector chip;

the laser chip, the wavelength division multiplexer and the optical socket of the receiving end are positioned on the same side in the first shell, and the optical detector chip, the wavelength division multiplexer and the optical socket of the transmitting end are positioned on the other side in the first shell;

the first periscope and the second periscope are overlapped with each other, the first periscope guides the optical signal output by the wavelength division multiplexer to one side of the transmitting end optical socket, and the second periscope guides the optical signal received by the receiving end optical socket into the wavelength division demultiplexer.

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