CN111239923A

CN111239923A - Optical module

Info

Publication number: CN111239923A
Application number: CN202010087154.4A
Authority: CN
Inventors: 蔚永军; 龚声福; 张晓廓; 慕建伟
Original assignee: Hisense Broadband Multimedia Technology Co Ltd
Current assignee: Hisense Broadband Multimedia Technology Co Ltd
Priority date: 2020-02-11
Filing date: 2020-02-11
Publication date: 2020-06-05

Abstract

The application provides an optical module, during optical transmitter, optical receiver and optic fibre adapter stretched into the mouth of pipe that corresponds on the round square body respectively, set up filtering partial wave plate and reflection of light piece in the round square body. The included angle between the normal line of the optical surface of the filtering partial wave plate and the optical axis of the optical fiber ferrule in the optical fiber adapter is larger than 0 degree and smaller than 45 degrees, the data optical signal received by the optical fiber ferrule is reflected to the reflecting plate through the filtering partial wave plate, and the reflecting plate reflects the data optical signal reflected by the filtering partial wave plate to the optical receiver again; and the data optical signal transmitted by the optical transmitter can directly transmit the filtering partial wave plate to the optical fiber insertion core. This application changes through the coating film technique to filtering partial wave plate, simultaneously based on the change of its coating film technique, reduces the contained angle of the optical surface normal of filtering partial wave plate and the optical axis of optic fibre lock pin in the fiber adapter, realizes the separation of the near light emission light sum receipt light of wavelength interval.

Description

Optical module

Technical Field

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

Background

Currently, 5G communication is widely mentioned in a plurality of fields such as internet of vehicles, medical treatment, smart grid and the like. The application foundation of 5G communication is communication mainly based on optical communication, wherein the technical support of the optical module is in the core position and plays a core role.

However, to realize the upgrade of 4G communication to 5G communication, the speed of optical communication needs to be further increased, wherein the transmission speed of the medium backhaul field needs to be increased to at least 50 Gbps. In order to greatly increase the capacity of a transmission network, save optical fiber resources, reduce the construction cost of an optical network, and rapidly promote the layout and operation of a 5G wireless communication technology, it is imperative to adopt a next-generation 50G BiDi (Bidirectional single fiber) system to smoothly upgrade the existing transmission network.

PAM4(4Pulse Amplitude Modulation) based signal is a hot signal transmission technology for high-speed signal interconnection in a next generation data center, so that a 50G PAM4 single-fiber bidirectional transceiving optical module is generally adopted in the fields of 5G forward transmission, intermediate transmission and return transmission. In a 50G PAM4 single-fiber bidirectional transmitting and receiving optical module, the emission wavelength is usually 1295nm and the receiving wavelength is 1309nm, that is, the wavelength interval between the emission light and the receiving light is 14 nm. Since the wavelength interval between the emitted light and the received light is narrow, if a commonly used 45-degree filter is adopted to separate the emitted light from the received light, the coating technology of the filter is challenging and even impossible to realize.

Disclosure of Invention

The embodiment of the application provides an optical module, which aims at solving the problem that when the wavelength interval between transmitting light and receiving light is small in a single-fiber bidirectional light receiving and transmitting optical module, the two kinds of light are difficult to separate by using the existing 45-degree filter.

The application provides an optical module mainly includes:

a circuit board;

the optical transceiving secondary module is electrically connected with the circuit of the circuit board;

the optical transceiver sub-assembly includes:

the surface of the round and square pipe body is provided with a first pipe orifice, a second pipe orifice and a third pipe orifice;

the optical transmitter extends into the first pipe orifice and is used for transmitting data optical signals;

the filtering partial wave plate is arranged in the round and square tube body and used for transmitting the data optical signal emitted by the light emitter to the optical fiber inserting core;

the optical fiber adapter extends into the second pipe orifice, is internally provided with the optical fiber inserting core and is used for receiving a data optical signal from the outside of the optical module and sending the data optical signal transmitted by the filtering partial wave plate to the outside of the optical module; the included angle between the optical surface normal of the filtering partial wave plate and the optical axis of the optical fiber ferrule is greater than 0 degree and less than 45 degrees, and the included angle is used for reflecting the data optical signal received by the optical fiber ferrule;

the reflector plate is arranged in the round and square tube and used for reflecting the data optical signals reflected by the filtering partial wave plate to an optical receiver;

and the optical receiver extends into the third pipe orifice and is used for receiving the data optical signal reflected by the reflector plate.

In the optical module that this application embodiment provided, during optical transmitter, optical receiver and optical fiber adapter stretched into the mouth of pipe that corresponds on the round and square body respectively, set up filtering partial wave plate and reflection of light piece in the round and square body. The included angle between the normal line of the optical surface of the filtering partial wave plate and the optical axis of the optical fiber ferrule in the optical fiber adapter is larger than 0 degree and smaller than 45 degrees, the data optical signal received by the optical fiber ferrule is reflected to the reflecting plate through the filtering partial wave plate, and the reflecting plate reflects the data optical signal reflected by the filtering partial wave plate to the optical receiver again; and the data optical signal transmitted by the optical transmitter can directly transmit the filtering partial wave plate to the optical fiber insertion core. According to the embodiment of the application, the coating technology of the filtering partial wave plate is changed, and meanwhile, based on the change of the coating technology, the included angle between the normal line of the optical surface of the filtering partial wave plate and the optical axis of the optical fiber ferrule in the optical fiber adapter is reduced, namely, the included angle between the incident light and the normal line of the optical surface of the incident light is reduced, so that the optical fiber adapter can play a role in intensive light splitting, and the separation of optical signals with close wavelength intervals is realized; meanwhile, the data optical signal reflected by the filtering partial wave plate is reflected to the optical receiver by matching with the use of the reflector plate, and further, the separation of the transmitting light and the receiving light with the closer wavelength interval can be realized on the basis of not influencing the optical receiving function.

Drawings

In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without any creative effort.

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 provided in this embodiment;

fig. 4 is an exploded schematic structural diagram of an optical module provided in this embodiment;

fig. 5 is a schematic structural diagram of an optical transceiver sub-assembly provided in this embodiment;

fig. 6 is an exploded schematic view of an optical transceiver sub-assembly provided in this embodiment;

fig. 7 is a schematic cross-sectional structure diagram of an optical transceiver sub-assembly provided in this embodiment;

fig. 8 is an exploded schematic view of another optical sub-assembly provided in this embodiment;

FIG. 9 is a schematic structural view of a lens adapter member provided in the present embodiment;

FIG. 10 is a cross-sectional view of the lens adapter member and the lens assembly of this embodiment after assembly;

FIG. 11 is a schematic view of a first assembly structure of a lens adapter part and a lens provided in this embodiment;

FIG. 12 is a schematic view of a first exploded structure of a lens adapter part and a lens provided in the present embodiment;

FIG. 13 is a schematic view of a second assembly structure of a lens adapter part and a lens provided in the present embodiment;

fig. 14 is a schematic diagram of a second disassembled structure of a lens adapter component and a lens provided in this embodiment.

Detailed Description

The technical solutions in the embodiments will be described clearly and completely with reference to the drawings in the embodiments, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, 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 invention.

One of the core elements of fiber optic communications is the conversion of optical to electrical signals. The optical fiber communication uses the optical signal carrying information to transmit in the optical fiber/optical waveguide, and the information transmission with low cost and low loss can be realized by using the passive transmission characteristic of the light in the optical fiber. The information processing devices such as computers use electrical signals, which require the interconversion between electrical signals and optical signals during the signal transmission process.

The optical module realizes the photoelectric conversion function in the technical field of optical fiber communication, and the interconversion of optical signals and electric 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 a circuit board, main electrical connections comprise power supply, I2C signals, data signal transmission, grounding and the like, the electrical connection mode realized by the golden finger becomes a standard mode of the optical module industry, and on the basis, the circuit board is a necessary technical characteristic in most optical modules.

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 an optical network unit 100, an optical module 200, an optical fiber 101, and a network cable 103;

one end of the optical fiber is connected with the far-end server, one end of the network cable is connected with the 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 and the network cable; and the connection between the optical fiber and the network cable is completed by an optical network unit with an optical module.

An optical port of the optical module 200 is connected with the optical fiber 101 and establishes bidirectional optical signal connection with the optical fiber; the electrical port of the optical module 200 is accessed into the optical network unit 100, and establishes bidirectional electrical signal connection with the optical network unit; the optical module realizes the mutual conversion of optical signals and electric signals, thereby realizing the connection between the optical fiber and the optical network unit; 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 unit 100, and the electrical signal from the optical network unit 100 is converted into an optical signal by the optical module and input to the optical fiber. The optical module 200 is a tool for realizing the mutual conversion of the photoelectric signals, and has no function of processing data, and information is not changed in the photoelectric conversion process.

The optical network unit is provided with an optical module interface 102, which is used for accessing an optical module and establishing bidirectional electric signal connection with the optical module; the optical network unit is provided with a network cable interface 104 for accessing a network cable and establishing bidirectional electric signal connection with the network cable; the optical module is connected with the network cable through the optical network unit, specifically, the optical network unit 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 unit is used as an upper computer of the optical module to monitor the work 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 unit and the network cable.

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

Fig. 2 is a schematic diagram of an optical network unit structure. As shown in fig. 2, the optical network unit 100 includes 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 fin-like engagement structure that increases a heat radiation area.

The optical module 200 is inserted into an optical network unit, specifically, an electrical port of the optical module is inserted into an electrical connector in the cage 106, and an optical port of the optical module is connected with the optical fiber 101.

The cage 106 is positioned on the circuit board, enclosing the electrical connectors on the circuit board in the cage; the optical module is inserted into the cage, the cage fixes the optical module, and heat generated by the optical module is conducted to the cage through the optical module housing and finally diffused through the heat sink 107 on the cage.

Fig. 3 is a schematic structural diagram of an optical module 200 according to an embodiment of the present disclosure, and fig. 4 is an exploded structural diagram of the optical module 200 according to an embodiment of the present disclosure. As shown in fig. 3 and 4, an optical module 200 provided in an embodiment of the present application includes an upper housing 201, a lower housing 202, an unlocking handle 203, a circuit board 204, and an optical transceiver sub-module 205.

The upper shell 201 is covered on the lower shell 202 to form a wrapping cavity with two openings; the outer contour of the wrapping cavity is generally a square body, and specifically, the lower shell comprises a main plate and two side plates which are positioned at two sides of the main plate and are perpendicular to the main plate; the upper shell comprises a 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 may be two end openings (206, 207) in the same direction, or two openings in different directions; one of the openings is an electrical port 206, and a gold finger of the circuit board extends out of the electrical port 206 and is inserted into an upper computer such as an optical network unit; the other opening is an electrical port 207 for external optical fiber access to connect with the optical transceiver sub-assembly 205 inside the optical module; the photoelectric devices such as the circuit board 204 and the optical transceiver sub-assembly 205 are positioned in the packaging cavity.

The assembly mode of combining the upper shell and the lower shell is adopted, so that the circuit board 204, the optical transceiver sub-module 205 and other devices can be conveniently installed in the shell, and the outermost packaging protection shell of the optical module is formed by the upper shell and the lower shell; the upper shell and the lower shell are made of metal materials generally, so that electromagnetic shielding and heat dissipation are facilitated; generally, the shell of the optical module cannot be made into an integrated structure, so that when devices such as a circuit board and the like are assembled, the positioning component, the heat dissipation structure and the electromagnetic shielding structure cannot be installed, and the production automation is not facilitated.

The unlocking handle 203 is located on the outer wall of the wrapping cavity/lower shell 202 and 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 handle 203 is provided with a clamping structure matched with the upper computer cage; the tail end of the unlocking handle is pulled to enable the unlocking handle 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 through a clamping structure of the unlocking handle; by pulling the unlocking handle, the clamping structure of the unlocking handle moves along with the unlocking handle, so that the connection relation between the clamping structure and the upper computer is changed, the clamping relation between the optical module and the upper computer is relieved, and the optical module can be drawn out from the cage of the upper computer.

The circuit board 204 is provided with circuit traces, electronic components (such as capacitors, resistors, triodes, and MOS transistors), and chips (such as the microprocessor MCU2045, the laser driver chip, the limiting amplifier, the clock data recovery CDR, the power management chip, and the data processing chip DSP).

The circuit board 204 connects the electrical devices in the optical module together according to circuit design through circuit wiring to realize electrical functions such as power supply, electrical signal transmission, grounding and the like.

The circuit board 204 is generally a rigid circuit board, which can also realize a bearing effect due to its relatively hard material, for example, the rigid circuit board can stably bear a chip; when the optical transceiver sub-assembly 205 is located on the circuit board, the rigid circuit board can also provide a smooth bearing; the hard circuit board can also be inserted into an electric connector in the upper computer cage, and specifically, a metal pin/golden finger is formed on the surface of the tail end of one side of the hard circuit board and is used for being connected with the electric connector; these are not easily implemented with flexible circuit boards.

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

The optical transceiver sub-assembly 205 is electrically connected to the circuit board 204 for transmitting and receiving optical signals. Fig. 5 is a schematic structural diagram of an optical transceiver sub-assembly provided in this embodiment, and fig. 6 is an exploded structural diagram of the optical transceiver sub-assembly provided in this embodiment. As shown in fig. 5 and 6, the rosa 205 mainly includes an optical transmitter 51, an adjusting connection component 52, a round tube 53, a fiber adapter 54, an optical receiver 55, and an isolator 56.

The round and square tube 53 is used for carrying the fixed light emitter 51, the optical fiber adapter 54 and the light receiver 55. In this embodiment, the round and square tube 53 is generally made of a metal material, so as to facilitate electromagnetic shielding and heat dissipation. The round and square tube 53 is provided with a first nozzle 531 for fixing the light emitter 51, a second nozzle 532 for fixing the optical fiber adapter 54, and a third nozzle 533 for fixing the light receiver 55. In order to reduce the interference of the light receiving and emitting paths and reduce the device size, the first nozzle 531 and the second nozzle 532 are respectively disposed on two opposite sidewalls of the round and square tube 53, and the second nozzle 532 and the third nozzle 533 are disposed on the adjacent sidewalls of the round and square tube 53 in this embodiment.

The optical transmitter 51 is used to transmit a data optical signal. As shown in fig. 5 and 6, the present embodiment is designed as a Tx TOCAN (coaxial package transmitter) composed of three parts, i.e., a pin, a socket and a cap, wherein the socket is used for carrying various devices such as a laser chip, a backlight detector, etc., the cap is fastened on the socket to protect the devices, the pin is connected to the devices arranged on the socket through the socket, and at the same time, the pin is electrically connected to the circuit board 204 through a flexible board or directly electrically connected to the circuit board 204. In order to isolate the reflected light in the optical path, a separator 56 is usually further arranged on the light-emitting side of the light emitter 51, and the light emitter 51 is connected with the separator 56 through the adjusting connecting part 52 in the embodiment, wherein after the light emitter 51 and the adjusting connecting part 52 are assembled, the pipe cap part of the light emitter 51 extends into the adjusting connecting part 52, and the pipe socket and the pipe pins are arranged on the outer side of the adjusting connecting part 52, it should be noted that in other embodiments, the adjusting connecting part can be omitted, namely, the light emitter 51 is directly inserted into the first pipe orifice 531.

The adjusting and connecting member 52 may be made of metal material to facilitate welding with the light emitter 51 and the round tube 53 and heat dissipation of the device. The adjusting link 52 extends into the first nozzle 531 of the round and square tube body 53, and a part thereof is disposed outside the round and square tube body 53. The part of the adjusting connecting part 52 which is arranged outside the round and square tube body 53 can be rotatably sleeved on the tube cap of the light emitter 51, and in addition, one end of the adjusting connecting part 52 which is arranged inside the round and square tube body 53 is fixedly provided with an isolator 56.

The spacer 56 is provided in the cavity of the round and square tube body 53 and fixed to the adjustment connecting member 52. The isolator 56 in this embodiment is based on the polarization principle of passing light, allowing light to pass only in a single direction. By the above-mentioned structural design of the light emitter 51, the adjusting connection member 52, the isolator 56, and the round and square tube 53, when the optical module is packaged, the adjusting connection member 52 is rotated outside the round and square tube 53, the isolator 56 in the round and square tube 53 is also rotated along with the adjusting connection member 52, and at the same time, the light emitter 51 is not rotated along with the adjusting connection member 52 because the light emitter 51 is rotatably sleeved with the adjusting connection member 52. Further, by rotating the adjusting connecting member 52, an angle between the polarization direction of the laser emitted by the light emitter 51 and the polarization direction of the isolator 56 can be adjusted, wherein the angle between the polarization direction of the laser emitted by the light emitter 51 and the polarization direction of the isolator 56 can be any value between 0 ° and 180 °. Based on the working principle of the isolator 56, the adjustment of the coupling power of the optical transmitter 51 and the isolator 56 is realized by adjusting the included angle between the polarization direction of the laser emitted by the optical transmitter 51 and the polarization direction of the isolator 56, so that the control of the output optical power of the optical module can be realized.

Further, the inside of the round and square tube 53 is a hollow cavity, and a filtering partial wave plate 572, a filtering plate 573 and a reflecting plate 574 are further disposed in the cavity.

The filter partial wave plate 572 is disposed between the optical transmitter 51, the optical fiber adapter 54 and the optical receiver 55, and is configured to transmit a signal transmitted by the optical transmitter 51 to the optical fiber ferrule 541 in the optical fiber adapter 54, and simultaneously, to enable a data optical signal received by the optical fiber adapter 54 to enter the optical receiver 55, where an angle between a normal of an optical surface of the filter partial wave plate 572 and an optical axis of the optical fiber ferrule 541 in the optical fiber adapter 54 is greater than 0 ° and less than 45 °, and preferably, an angle between a normal of the optical surface of the filter partial wave plate and the optical axis of the optical fiber ferrule 541 in the optical fiber adapter 54 is greater than 0 ° and less than 20 °. The reflective plate 574 is disposed between the filtering partial wave plate 572 and the optical fiber ferrule 541, and is used for reflecting the data optical signal reflected by the filtering partial wave plate 572 to the optical receiver 55.

The optical receiver 55 is for receiving a data optical signal. Similarly, the present embodiment is also designed as an Rx TOCAN (coaxial package receiver) composed of three parts, i.e., a pin, a socket and a cap, wherein the socket is used for carrying various devices, the cap is fastened on the socket to protect the devices, the pin is connected to the devices arranged on the socket through the socket, and meanwhile, the pin is electrically connected to the circuit board 204 through the flexible board or directly electrically connected to the circuit board 204. After the optical receiver 55 is assembled with the round and square tube 53, the cap portion of the optical receiver extends into the third tube opening 533, and the tube seat and the pins are disposed outside the round and square tube 53.

Further, a filter 573 is disposed between the reflector 574 and the optical receiver 55, i.e., on the light incident side of the optical receiver 55, so that the data optical signal reflected by the reflector 574 enters the optical receiver 55 after being filtered by the filter 573, thereby isolating stray light entering the optical receiver 55. Further, in order to increase the reception return loss value, that is, to reduce the ratio of the backward reflected light of the filter 573 to the input light thereof, so as to reduce the influence of the reflected light on the optical path system inside the optical module, and at the same time, to ensure the performance of the filter 573 in separating the wavelengths, this embodiment provides that the angle between the normal of the optical surface of the filter 573 and the light beam reflected by the reflector 574 is greater than or equal to 0 ° and less than or equal to 20 °, for example, the angle between the normal of the optical surface of the filter 573 and the light beam reflected by the reflector.

In the optical fiber adapter 54, in order to ensure a certain return loss value of the optical device, the optical coupling end surface of the optical fiber ferrule 541 disposed in the round-square tube 53 is generally beveled at a certain angle. After the optical fiber adapter 54 is assembled on the round-square tube 53, a part of the ferrule and the optical fiber ferrule 531 are placed in the lumen of the round-square tube 53, and the rest of the ferrule is placed outside the round-square tube 53.

Fig. 7 is a schematic cross-sectional structure diagram of an optical transceiver sub-assembly provided in this embodiment. As shown in fig. 7, the light emitter 51 can emit laser beams through the LD chip therein, and the aperture of the optical fiber is usually small (mostly in the order of micrometers), and in order to ensure the optical coupling effect, as shown in fig. 7, a first lens assembly 571 is disposed between the light emitter 51 and the filter partial wave plate 572, and a focusing lens 511 is also disposed at the cap of the light emitter 51. Similarly, since the light from the optical fiber is divergent light, in order to ensure the optical coupling effect and avoid optical loss, in this embodiment, the second lens set 575 is disposed between the optical fiber ferrule 541 and the filtering partial wave plate 572. The light entrance of the second lens set 575 faces the light exit of the optical fiber ferrule 541 and the light exit faces the optical surface of the filter sub-wave plate 572, and the second lens set 575 collimates the light from the optical fiber ferrule 541, so that the obtained parallel light propagates toward the filter sub-wave plate 572. Further, in order to avoid light divergence and influence on the optical coupling effect when the light reflected by the filter partial wave plate 572 is reflected at the reflection plate 574, in this embodiment, a focusing lens 551 is also disposed on the cap of the optical receiver 55.

As shown in fig. 7, by using the above design of the filtering partial wave plate 572, the reflecting plate 574, the filtering plate 573, and the coating on the surface of the filtering partial wave plate 572 and the filtering plate 573, when the optical module receives a data optical signal, the data optical signal is transmitted to the fiber ferrule 541 in the fiber adapter 54 through the fiber connected to the fiber adapter 54, then forms parallel light through the second lens set 575, and then transmits to the filtering partial wave plate 572, and is reflected to the reflecting plate 574 through the filtering partial wave plate 572, and then is filtered by the filtering plate 573 to filter stray light in the optical beam entering the optical receiver 55, and then is emitted to the focusing lens 551 on the optical receiver 55, and is focused on the light receiving core in the optical receiver 55 through the focusing lens 551; when the optical module transmits a data optical signal, the optical transmitter 51 emits a laser beam through an LD chip inside the optical transmitter 51, and the laser beam is focused by the focusing lens 511 on the optical transmitter 51, then transmitted through the isolator 56 and the filtering partial wave plate 572 in sequence, and then directly enters the optical fiber adapter 54, and then enters an optical fiber connected to the optical fiber adapter 54.

In this embodiment, the wavelength separation capability of the filtering partial wave plate is improved by changing the coating technique of the filtering partial wave plate, for example, by changing the spacing between grating structures formed on the surface of the filtering partial wave plate, or the number of coating layers, and the like, and meanwhile, based on the change of the coating technique of the filtering partial wave plate, the included angle between the normal of the optical surface of the optical fiber ferrule 541 in the optical fiber adapter 54 and the normal of the optical surface of the optical fiber ferrule is required to be reduced to enable the optical fiber to perform the dense light splitting function, so that the included angle between the data optical signal received by the optical fiber adapter 54 and the normal of the optical surface of the filtering partial wave plate 572 is set to be greater than 0 ° and less than 45 ° in this embodiment, that is, compared with a 45 ° filter, the included angle between the data optical signal received by the optical fiber adapter 54 and the normal of the optical surface of the filtering partial wave.

Meanwhile, after the incident angle of the data optical signal received by the optical fiber adapter 54 is reduced, the reflected light formed by reflection is emitted from the surface of the filter partial wave plate 572, and the included angle between the reflected light and the optical axis of the optical receiver 55 is also increased, so that the light reflected by the filter partial wave plate 572 can smoothly enter the optical receiver 55. Wherein, the placing angle of the reflective plate 574 needs to be matched with the filtering partial wave plate 572; for example, the optical axes of the optical receiver 55 and the optical transmitter 51 are perpendicular, and if the light reflected by the reflection plate 574 is to be irradiated to the light receiving chip in the optical receiver 55 perpendicularly, when the angle between the normal of the optical surface of the filter partial wave plate 572 and the light beam received by the optical fiber adapter 54 is 13 °, the angle between the normal of the optical surface of the reflection plate 574 and the light beam reflected by the filter partial wave plate 572 is set to be 32 °; when the angle between the normal of the optical surface of the filter partial wave plate 572 and the light beam received by the fiber adapter 54 is 16 °, the angle between the normal of the optical surface of the reflective plate 574 and the light beam reflected by the filter partial wave plate 572 is set to be 29 °; when the angle between the normal of the optical surface of the partial wave plate 572 and the light beam received by the fiber adapter 54 is 10 °, the angle between the normal of the optical surface of the reflection plate 574 and the light beam reflected by the partial wave plate 572 is set to 35 °. In addition, by setting the relative position between the reflection plate 574 and the filter 573, for example, setting the angle between the normal of the optical surface of the filter partial wave plate 572 and the light beam received by the optical fiber adapter 54 to 13 °, setting the angle between the normal of the optical surface of the reflection plate 574 and the light beam reflected by the filter partial wave plate 572 to 32 °, setting the angle between the optical surface of the filter 573 and the light beam received by the optical fiber adapter 54 to 6 °, it is possible to increase the return loss value of the received light, and realize the light beam shaping and control of high return loss.

In this embodiment, by using the characteristic that the performance of the filter partial wave plate 572 for separating wavelengths under the condition of small-angle light incidence is better, through the position design of the filter partial wave plate 572 and the reflection plate 574 and the placement angle design of the filter plate 573, light received by the optical fiber ferrule 541 enters the filter partial wave plate 572 at a small angle, and then separation of incident light and reflected light with a small wavelength interval can be realized. In addition, the tolerance of the front-back spacing between the elements can be improved by selecting a proper first collimating lens and a proper second collimating lens, for example, a Grin-lens self-focusing collimating lens is selected, and of course, other types of lenses can be selected, for example, a C-lens collimating lens which is simple to manufacture and process is selected.

Fig. 8 is an exploded schematic view of another optical sub-transceiver module provided in this embodiment. As shown in fig. 8, the optical sub-assembly in this embodiment is different from the above embodiments mainly in that the partial wave filter 572, the filter 573, and the reflector 574 are fixed to the lens adapter part to form an integrated optical component 57. Thus, when the module is packaged, the wavelength dispersion sheet 572, the filter 573, and the reflector 574 may be fixed to the lens adapter member, and then the optical member 57 obtained by assembly may be placed in the circular tube 53, and since the internal space of the circular tube 53 is limited, the present embodiment can reduce the difficulty of assembly compared to a case where the wavelength dispersion sheet 572, the filter 573, and the reflector 574 are directly fixed in the circular tube 53.

Fig. 9 is a schematic structural diagram of a lens adapter part provided in this embodiment, and fig. 10 is a schematic sectional structural diagram of an assembled lens adapter part and a lens provided in this embodiment. As shown in fig. 9 and 10, a first optical transmission channel 5766 and a second optical transmission channel 5767 are formed in the lens adapter part 576, and the first optical transmission channel 5766 is respectively optically connected with the optical transmitter 51 and the optical fiber ferrule 541, that is, the optical beam emitted by the optical transmitter 51 can be transmitted to the optical fiber ferrule 541 through the first optical transmission channel 5766, and the second optical transmission channel 5767 is optically connected with the optical receiver 55, that is, the optical beam received by the optical fiber ferrule 541 can be transmitted to the optical receiver 55 through the second optical transmission channel 5767.

Fig. 11 is a schematic view of a first assembly structure of a lens adapter part and a lens provided in this embodiment, and fig. 12 is a schematic view of a first disassembly structure of the lens adapter part and the lens provided in this embodiment. As shown in fig. 9 to 12, the bottom of the lens adapter part 576 is further formed with a first recess 5762 and a second recess 5764, and the first recess 5762 communicates with the first light transmission channel 5766, and the second recess 5764 communicates with the first light transmission channel 5766 and the second light transmission channel 5767, respectively, and the filtering partial wave plate 572 is disposed in the first recess 5762, and the reflective plate 574 is disposed in the second recess 5764.

Further, based on the fact that the partial filter plate 572 and the fiber stub 541 and the partial filter plate 572 and the reflective plate 574 need to be arranged according to a preset angle, in order to fix the partial filter plate 572 and the reflective plate 574 conveniently, in this embodiment, the side wall of the first recessed portion 5762 is arranged, as shown in fig. 9, the first recessed portion 5762 is arranged in a V-shaped groove structure, but may also be in other shapes, the first side wall 762a close to the internal light emitter 51 is arranged in an inclined structure, of course, the side wall close to the fiber adapter 54 may also be arranged in an inclined structure, the inclined angle is designed according to the requirement of the inclined angle of the partial filter plate 572, the optical surface of the partial filter plate 572 is arranged in parallel or approximately parallel to the first side wall 762a, for example, when the included angle between the normal of the optical surface of the partial filter plate 572 and the optical axis of the fiber stub 541 is set to 10 °, the included angle between the normal of the first side wall 762a and the optical axis of, in this way, the optical surface of the partial wave plate 572 near the light emitter 51 can be directly attached to the first sidewall 762a, and the optical alignment process can be omitted.

Similarly, the second concave portion 5764 is also configured as a V-shaped groove structure, and of course, it may also be configured in other shapes, the second sidewall 764a close to the internal light emitter 51 is configured as an inclined structure, and of course, the sidewall close to the optical fiber adapter 54 may also be configured as an inclined structure, and the inclined angle thereof is designed according to the requirement of the inclined angle of the reflective sheet 574, and the optical surface of the reflective sheet 574 is configured to be parallel or approximately parallel to the second sidewall 764a, for example, when the included angle between the normal of the optical surface of the reflective sheet 574 and the optical axis of the optical fiber ferrule 541 is configured as 32 °, the included angle between the normal of the second sidewall 764a and the optical axis of the optical fiber ferrule 541 is also configured as 32 °, so that the optical surface of the reflective sheet 574 close to the light emitter 51 can be directly attached to the second sidewall 764a, and the optical alignment process.

In addition, in order to facilitate observation of the optical path between the partial wave plate 572 and the reflective plate 574, in the present embodiment, a part of the first optical transmission channel 5766, which is an optical transmission channel between the partial wave plate 572 and the reflective plate 574, is designed to be an open structure.

Fig. 13 is a schematic view of a second assembly structure of a lens adapter part and a lens provided in this embodiment, and fig. 14 is a schematic view of a second disassembly structure of the lens adapter part and the lens provided in this embodiment. As shown in fig. 13 and 14, a third recess 5763 is further formed in the top of the lens adapter member 576, and the third recess 5763 communicates with the second light transmission passage 5767, and a filter 573 is attached to the bottom of the third recess 5763. To facilitate mounting of the filter 573, the bottom surface of the third concave portion 5763 may be a planar structure with a through hole in the middle. If the filter 573 needs a certain oblique angle with respect to the optical axis of the fiber stub 541, the bottom surface of the third recessed portion 5763 can be provided with an oblique surface, for example, when the angle between the optical surface of the filter 573 and the optical axis with respect to the fiber stub 541 is 6 °, the angle between the bottom surface of the third recessed portion 5763 and the optical axis of the fiber stub 541 is also 6 °, and thus, the optical surface of the filter 573 can be directly attached to the bottom surface of the third recessed portion 5763.

Further, as shown in fig. 11 to 13, a first lens opening 5761 and a second lens opening 5765 are respectively disposed at two ends of the lens adapter part 576, wherein the first lens opening 5761 and the second lens opening 5765 are both communicated with the first light transmission channel 5766, the first lens set 571 is disposed in the first lens opening 5761, and the second lens set 575 is disposed in the second lens opening 5765, so that the optical elements in the circular tube 53 are integrated on the lens adapter part 576.

Based on the above structure, when the optical module receives a data optical signal, the data optical signal is transmitted to the optical fiber ferrule 541 in the optical fiber adapter 54 through the optical fiber connected to the optical fiber adapter 54, then forms parallel light through the second lens set 575, propagates to the filter partial wave plate 572 in the first optical transmission channel 5766, reflects light formed by reflection of the filter partial wave plate 572, propagates to the reflective plate 574 in the first optical transmission channel 5766, propagates to the filter 573 in the second optical transmission channel 5767 through the reflective plate 574, and finally, after being filtered by the filter 573, filters stray light in a light beam entering the optical receiver 55, and then irradiates to the focusing lens 551 on the optical receiver 55, and is refocused by the focusing lens 551 and then enters the optical receiving chip in the optical receiver 55; when the optical module transmits a data optical signal, the optical transmitter 51 emits a laser beam through an LD chip therein, the laser beam is focused by the focusing lens 511 on the optical transmitter 51, then transmitted through the isolator 56 and the filtering partial wave plate 572 in sequence, and then directly transmitted to the optical fiber adapter 54 through the first optical transmission channel 5766, and then enters an optical fiber connected to the optical fiber adapter 54.

All the embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments, and the relevant points may be referred to the part of the description of the method embodiment. It is noted that other embodiments of the present invention will become readily apparent to those skilled in the art from consideration of the specification and practice of the invention herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.

It will be understood that the present application is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.

Claims

1. A light module, comprising:

a circuit board;

the optical transceiver sub-assembly includes:

2. A light module as claimed in claim 1, characterized in that the round, square tube body is further provided with a filter plate, wherein,

the filter is arranged between the reflector and the light receiver; the data optical signal reflected by the reflector plate is transmitted to the optical receiver after being filtered by the filter plate.

3. The optical module according to claim 2, wherein an angle between an optical surface normal of the filter sheet and the light beam reflected by the reflector sheet is greater than or equal to 0 ° and less than or equal to 20 °.

4. The optical module of claim 1, wherein a lens adapter member is disposed within the round and square tube, wherein:

a first optical transmission channel and a second optical transmission channel are arranged in the lens adapter component, the first optical transmission channel is respectively optically connected with the optical transmitter and the optical fiber ferrule, and the second optical transmission channel is optically connected with the optical receiver;

the bottom of the lens adapter part is provided with a first concave part and a second concave part;

the first sunken part is communicated with the first optical transmission channel, and the filtering partial wave plate is arranged in the first sunken part;

the second depressed part is respectively communicated with the first light transmission channel and the second light transmission channel, and the reflector plate is arranged in the second depressed part.

5. The optical module of claim 4, wherein the first recess includes a sloped first sidewall, the filter partial wave plate being attached to the first sidewall.

6. The light module of claim 4 or 5, wherein the second recess comprises a slanted second sidewall, and the reflective sheet is attached to the second sidewall.

7. The light module of claim 4 or 5, wherein the top of the lens adapter member is provided with a third recess, wherein:

the third depressed part is communicated with the second optical transmission channel, and a filter is attached to the bottom of the depressed part.

8. The optical module of claim 4, wherein the lens adapter member is provided with a first lens port and a second lens port at both ends thereof, respectively, wherein:

the first lens opening and the second lens opening are communicated with the first optical transmission channel;

the first lens group is arranged in the first lens opening and used for collimating the data optical signal emitted by the optical emitter and then sending the data optical signal to the filtering partial wave plate;

and the second lens group is arranged in the second lens port and used for sending the data optical signal received by the optical fiber inserting core to the filtering partial wave plate after being collimated.

9. The optical module of claim 1, wherein an angle between the optical surface normal of the filtering partial wave plate and the optical axis of the optical fiber ferrule is greater than 0 ° and less than or equal to 20 °.

10. The optical module according to claim 1, wherein an angle between an optical surface normal of the filter sheet and the light beam reflected by the reflector sheet is greater than or equal to 4 ° and less than or equal to 10 °.