CN114545571A

CN114545571A - Optical module

Info

Publication number: CN114545571A
Application number: CN202011364613.5A
Authority: CN
Inventors: 蔚永军; 庞广宁
Original assignee: Hisense Broadband Multimedia Technology Co Ltd
Current assignee: Hisense Broadband Multimedia Technology Co Ltd
Priority date: 2020-11-27
Filing date: 2020-11-27
Publication date: 2022-05-27

Abstract

The application provides an optical module, includes: the round and square pipe body is provided with an inner cavity; the light emitting component is connected with the round and square tube body and used for generating first wavelength signal light; the light receiving assembly is connected with the round and square tube body and used for receiving second wavelength signal light from the outside of the optical module, and the wavelength difference between the second wavelength signal light and the first wavelength signal light is less than 60 nm; the optical assembly is arranged in the inner cavity of the round and square tube body and used for transmitting the signal light generated by the light emitting assembly and the signal light from the outside of the optical module; the optical component comprises a first filter and a reflector, the first filter and the reflector are arranged on a transmission light path of the first wavelength signal light and the second wavelength signal light, the first filter is used for transmitting the first wavelength signal light and reflecting the second wavelength signal light to the reflector, and the reflector reflects the second wavelength signal light to the light receiving component. The optical module provided by the embodiment of the application can realize wavelength division multiplexing when the wavelength of the received signal light is closer to that of the transmitted signal light.

Description

Optical module

Technical Field

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

Background

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

With the development of 5G (5th Generation mobile networks or 5th Generation wireless systems, 5th-Generation, fifth Generation mobile communication technology), the 5G fronthaul optical module is a 25G Tunable BIDI color optical module based on 5G fronthaul application, and conforms to g.metro (g.698.4) protocol. In the face of the bandwidth, time delay and synchronization requirements of a 5G transmission bearer network, compared with other solutions, the G.Metro has the advantages of large bandwidth, adaptive adaptation, small time delay, good synchronization support capability and the like. In addition, the G.Metro technology greatly simplifies network construction and operation maintenance, reduces the types and the number of spare parts and reduces the network construction cost. However, as the wavelength of the received signal light and the wavelength of the transmitted signal light become closer, wavelength division multiplexing in the 5G fronthaul optical module increases more difficulty.

Disclosure of Invention

The embodiment of the application provides an optical module, which can realize light splitting when the wavelength of a received signal light is closer to that of a transmitted signal light.

The application provides an optical module, includes:

the round and square pipe body is provided with an inner cavity;

the light emitting component is connected with the round and square tube body and used for generating first wavelength signal light;

the light receiving assembly is connected with the round and square tube body and used for receiving second wavelength signal light from the outside of an optical module, and the wavelength difference between the second wavelength signal light and the first wavelength signal light is less than 60 nm;

the optical assembly is arranged in the inner cavity of the round and square tube body and used for transmitting the signal light generated by the light emitting assembly and the signal light from the outside of the optical module;

wherein, optical assembly includes first filter and speculum, first filter with the speculum sets up first wavelength signal light and the transmission light path of second wavelength signal light, first filter is used for the transmission first wavelength signal light and reflection second wavelength signal light extremely the speculum, the speculum reflects second wavelength signal light extremely the light receiving component.

In the optical module that this application provided, the first wavelength signal light transmission that the optical transmission subassembly produced to the round side body and pass through first filter, come and the outside second wavelength signal light transmission of optical module to the round side body through first filter reflection to speculum, through the speculum reflection to the light receiving component. The wavelength difference of the first wavelength signal light and the second wavelength signal light is smaller than 60nm, and a single transflective lens cannot normally complete wavelength division multiplexing, so in the optical module provided by the application, wavelength division multiplexing of optical transmission and optical reception in the optical module is realized through the first filter and the reflector, because the first filter and the reflector are used in combination, angle selection and adjustment of the first filter on a transmission optical path in the optical module are convenient to realize, and then the optical module provided by the application is convenient to realize light division when the received signal optical wavelength and the transmitted signal optical wavelength are relatively close, so that smooth realization of wavelength division multiplexing of optical transmission and optical reception in the optical module is ensured when the received signal optical wavelength and the transmitted signal optical wavelength are relatively close.

Drawings

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

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

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

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

FIG. 4 is a schematic diagram of an exploded structure of an optical module according to an embodiment of the present application;

fig. 5 is a schematic structural diagram of an optical sub-assembly according to an embodiment of the present disclosure;

FIG. 6 is a cross-sectional view of an optical subassembly according to an embodiment of the present disclosure;

fig. 7 is a first cross-sectional view of a circular tube provided in the present embodiment;

FIG. 8 is a receiving light path diagram of a light receiving element according to an embodiment of the present invention;

fig. 9 is a first schematic structural view of a circular-square tube according to an embodiment of the present disclosure;

fig. 10 is a second schematic structural view of a circular-square tube according to an embodiment of the present disclosure;

fig. 11 is a second cross-sectional view of a circular tube body according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this application and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

In the following, some embodiments of the present application will be described in detail with reference to the drawings, and features in the following examples and examples may be combined with each other without conflict.

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

The optical module realizes the function of interconversion between optical signals and electrical signals in the technical field of optical fiber communication, and interconversion between optical signals and electrical signals is the core function of the optical module. The optical module is electrically connected with an external upper computer through a golden finger on an internal circuit board of the optical module, and the main electrical connection comprises power supply, I2C signals, data signals, grounding and the like; the optical module realizes optical connection with external optical fibers through an optical interface, the external optical fibers are connected in various ways, and various optical fiber connector types are derived; the method is characterized in that the electric connection is realized by using a golden finger at an electric interface, which becomes the mainstream connection mode of the optical module industry, and on the basis, the definition of pins on the golden finger forms various industry protocols/specifications; the optical connection mode realized by adopting the optical interface and the optical fiber connector becomes the mainstream connection mode of the optical module industry, on the basis, the optical fiber connector also forms various industry standards, such as an LC interface, an SC interface, an MPO interface and the like, the optical interface of the optical module also makes adaptive structural design aiming at the optical fiber connector, and the optical fiber adapters arranged at the optical interface are various. Fig. 1 is a schematic diagram of connection relationship of an optical communication terminal. As shown in fig. 1, the connection of the optical communication terminal mainly includes the interconnection among the optical network terminal 100, the optical module 200, the optical fiber 101 and the network cable 103;

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

An optical interface of the optical module 200 is externally accessed to the optical fiber 101, and establishes bidirectional optical signal connection with the optical fiber 101; the electrical interface of the optical module 200 is externally connected to the optical network terminal 100, and establishes a bidirectional electrical signal connection with the optical network terminal 100; bidirectional interconversion of optical signals and electric signals is realized inside the optical module, so that information connection is established between the optical fiber and the optical network terminal; specifically, the optical signal from the optical fiber 101 is converted into an electrical signal by the optical module and then input to the optical network terminal 100, and the electrical signal from the optical network terminal 100 is converted into an optical signal by the optical module and input to the optical fiber 101.

The optical network terminal is provided with an optical module interface 102, which is used for accessing an optical module 200 and establishing bidirectional electric signal connection with the optical module 200; the optical network terminal has a network cable interface 104, which is used for accessing the network cable 103 and establishing a bidirectional electrical signal connection (generally, an electrical signal of an ethernet protocol, which is different from an electrical signal used by an optical module in protocol/type) with the network cable 103; the optical module 200 is connected to the network cable 103 through the optical network terminal 100, specifically, the optical network terminal transmits a signal from the optical module to the network cable and transmits the signal from the network cable to the optical module, and the optical network terminal serves as an upper computer of the optical module to monitor the operation of the optical module. The optical network terminal is an upper computer of the optical module, provides data signals for the optical module and receives the data signals from the optical module, and a bidirectional signal transmission channel is established between the remote server and the local information processing equipment through the optical fiber, the optical module, the optical network terminal and a network cable.

Common local information processing apparatuses include routers, home switches, electronic computers, and the like; common optical network terminals include an optical network unit ONU, an optical line terminal OLT, a data center server, a data center switch, and the like.

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

The optical module 200 is inserted into an optical network terminal, the electrical interface of the optical module is inserted into the electrical connector inside the cage 106, and the optical interface of the optical module is connected to the optical fiber 101.

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

The fifth generation mobile communication technology (5G) currently meets the current growing demand for high-speed wireless transmission. The frequency spectrum adopted by the 5G communication is much higher than that adopted by the 4G communication, which brings greatly improved communication rate for the 5G communication, but the transmission attenuation of the signal is relatively obviously increased.

The requirements of new service characteristics and higher indexes of 5G provide new challenges for a bearer network architecture and each layer of technical solutions, wherein an optical module serving as a basic constituent unit of a physical layer of a 5G network also faces technical innovation and upgrade, which is mainly reflected in that the optical module applied to 5G transmission needs to have two basic technical characteristics of high-speed transmission and low return loss. In order to meet the requirement of an optical module in a 5G communication network, an embodiment of the present application provides an optical module.

Fig. 3 is a schematic view of an optical module according to an embodiment of the present disclosure, and fig. 4 is a schematic view of an exploded structure of an optical module according to an embodiment of the present disclosure. As shown in fig. 3 and 4, an optical module 200 provided in the embodiments of the present application includes an upper housing 201, a lower housing 202, a circuit board 203, an optical sub-module, and the like. The optical subassembly in the optical module 200 provided by the embodiment of the present application includes a circular-square tube 300, a light emitting module 400, and a light receiving module 500.

The upper shell 201 is covered on the lower shell 202 to form a wrapping cavity with two openings; the outer contour of the wrapping cavity is generally a square body, and specifically, the lower shell comprises a main plate and two side plates which are positioned 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 ends (204, 205) in the same direction, or two openings in different directions; one opening is an electric port 204, and a gold finger of the circuit board extends out of the electric port 204 and is inserted into an upper computer such as an optical network terminal; the other opening is an optical port 205 for external optical fiber access; the photoelectric devices such as the circuit board 203, the round and square tube 300, the light emitting module 400 and the light receiving module 500 are positioned in the packaging cavity formed by the upper and lower shells.

The assembly mode of combining the upper shell 201 and the lower shell 202 is adopted, so that the round square tube body 300, the light emitting assembly 400, the light receiving assembly 500 and other devices can be conveniently installed in the shells, and the upper shell 201 and the lower shell 202 form an outermost packaging protection shell of the optical module; the upper shell 201 and the lower shell 202 are generally made of metal materials, which is beneficial to realizing electromagnetic shielding and heat dissipation; generally, the housing of the optical module is not made into an integrated component, so that when devices such as a circuit board and the like are assembled, the positioning component, the heat dissipation component and the electromagnetic shielding component cannot be installed, and the production automation is not facilitated.

Typically, the optical module 200 further includes an unlocking component located on an outer wall of the package cavity/lower housing 202 for implementing a fixed connection between the optical module and the upper computer or releasing the fixed connection between the optical module and the upper computer.

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

The circuit board 203 is provided with circuit traces, electronic components (such as capacitors, resistors, triodes, and MOS transistors), and chips (such as an MCU, a clock data recovery CDR, a power management chip, and a data processing chip DSP).

The circuit board 203 connects the electrical appliances in the optical module together according to the circuit design through circuit wiring to realize the electrical functions of power supply, electrical signal transmission, grounding and the like.

The circuit board 203 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 is positioned on the circuit board, the rigid circuit board can also provide stable bearing; the hard circuit board can also be inserted into an electric connector in the upper computer cage, and specifically, a metal pin/golden finger is formed on the surface of the tail end of one side of the hard circuit board and is used for being connected with the electric connector; these are not easily implemented with flexible circuit boards.

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

As shown in fig. 4, in the optical module provided in this embodiment, the light emitting module 400 and the light receiving module 500 are both disposed on the circular-square tube 300, the light emitting module 400 is used for generating and outputting signal light, and the light receiving module 500 is used for receiving signal light from outside the optical module; the round and square tube 300 is provided with an inner cavity, and the signal light (first wavelength signal light) output by the light emitting module 400 and the signal light (second wavelength signal light) from the outside of the optical module are transmitted to the inner cavity of the round and square tube 300, and the first wavelength signal light and the second wavelength signal light are only used for distinguishing the signal light output by the light emitting module 400 and the signal light received by the light receiving module 500. Further, the round and square tube 300 is provided with the optical fiber adapter 206, and the optical fiber adapter 206 is used for realizing connection between an optical module and an external optical fiber; further, the first wavelength signal light is transmitted to the external optical fiber through the optical fiber adapter 206, and the second wavelength signal light is transmitted from the external optical fiber through the optical fiber adapter 206 into the circular tube 300. In addition, the inner cavity of the round and square tube 300 is generally disposed in an optical assembly, and the optical assembly is configured to adjust the propagation direction of the first wavelength signal light and the second wavelength signal light and implement wavelength division multiplexing of the first wavelength signal light and the second wavelength signal light; the optical assembly includes an optical device such as a lens. The light emitting module 400 and the light receiving module 500 are physically separated from the circuit board 203, and thus it is difficult to directly connect the light emitting module 400 and the light receiving module 500 to the circuit board 203, so that the light emitting module 400 and the light receiving module 500 in the embodiment of the present application are electrically connected through flexible circuit boards, respectively. However, in the embodiment of the present application, the assembling structure of the light emitting module 400 and the light receiving module 500 is not limited to the structure shown in fig. 3 and 4, and other assembling and combining structures may be adopted, and the embodiment is only exemplified by the structure shown in fig. 3 and 4.

Fig. 5 is a schematic structural diagram of an optical sub-assembly according to an embodiment of the present application. As shown in fig. 5, the optical subassembly provided in the embodiment of the present application includes a round and square tube 300, a light emitting assembly 400, and a light receiving assembly 500. The light emitting assembly 400 is arranged on the round and square tube 300 and is coaxial with the optical fiber adapter 206 of the round and square tube 300, and the light receiving assembly 500 is arranged on the side of the round and square tube 300 and is not coaxial with the optical fiber adapter 206; however, in embodiments of the present application, the light receiving assembly 500 may be coaxial with the fiber optic adapter 206 and the light emitting assembly 400 may be non-coaxial with the fiber optic adapter 206. The light emitting module 400 and the light receiving module 500 are connected through the round and square tube 300, so that on one hand, the control of the signal light transmission light path is convenient to realize through the wavelength division multiplexing technology, on the other hand, the compact design of the interior of the optical module is convenient to realize, and the occupied space of the signal light transmission light path is reduced. In addition, with the development of the wavelength division multiplexing technology, in some optical modules, more than one light emitting module 400 and light receiving module 500 are disposed on the circular-square tube 300; or, the optical sub-module is not only used for transmitting and receiving one path of signal light.

In some conventional optical modules, wavelength division multiplexing of the first wavelength signal light and the second wavelength signal light may be implemented by a 45 ° angle-arranged transflective mirror, and the 45 ° transflective mirror is used to transmit the first wavelength signal light and reflect the second wavelength signal light to the light receiving assembly 500. However, in use, it is found that the 45 ° mirror performs wavelength division multiplexing of the first wavelength signal light and the second wavelength signal light only when the wavelength difference between the first wavelength signal light and the second wavelength signal light is above 60nm, and when the wavelength difference between the first wavelength signal light and the second wavelength signal light is less than or far less than 60nm, for example, the wavelength difference between the first wavelength signal light and the second wavelength signal light is about 10nm, the 45 ° mirror hardly performs wavelength division multiplexing of the first wavelength signal light and the second wavelength signal light. Therefore, as the wavelengths of the received signal light and the transmitted signal light approach each other, it is difficult for the 45 ° angle mirror to split the received light and the transmitted light having the approaching wavelengths. In some embodiments provided by the present application, the optical component in the circular-square tube 300 is selectively arranged to realize the wavelength division when the wavelengths of the received signal light and the transmitted signal light are relatively close, so as to ensure the smooth performance of the wavelength division multiplexing when the wavelengths of the received signal light and the transmitted signal light in the optical module are relatively close.

Fig. 6 is a cross-sectional view of an optical subassembly according to an embodiment of the present disclosure. As shown in fig. 6, the optical subassembly provided in the embodiment of the present application includes a circular-square tube 300. One end of the round and square tube 300 in the length direction is connected with the light emitting module 400, the other end of the round and square tube 300 in the length direction is connected with the optical fiber adapter 206, and one side of the round and square tube 300 in the width direction is provided with the light receiving module 500. The round and square tube 300 has an inner cavity for disposing an optical assembly, and the optical assembly is used for transmitting signal light generated by the light emitting assembly 400 and external signal light from the optical module and adjusting a transmission light path. The optical fiber adapter 206 is used for connecting an external optical fiber, so that the signal light generated by the light emitting assembly 400 is transmitted to the round and square tube 300, transmitted to the optical fiber adapter 206 through the optical assembly in the round and square tube 300, and finally coupled to the external optical fiber through the optical fiber adapter 206; meanwhile, the signal light of the optical module transmitted by the external optical fiber is transmitted to the round and square tube 300 through the optical fiber adapter 206, and finally transmitted to the light receiving module 500 through the optical module in the round and square tube 300.

In the embodiment of the present application, the optical module further includes an adjusting sleeve 207, and the optical fiber adapter 206 is connected to the round-square tube 300 through the adjusting sleeve 207. Optionally, one end of the adjusting sleeve 207 is connected to the round-square tube 300, and the other end of the adjusting sleeve 207 is connected to the optical fiber adapter 206, so that the position of the optical fiber adapter 206 in the three-dimensional direction of the round-square tube 300 can be adjusted conveniently through the adjusting sleeve 207, the optical coupling degree between the optical fiber adapter 206 and the round-square tube 300 is ensured, and further the coupling efficiency of the light emission subassembly 400 for emitting light to an external optical fiber is ensured. The adjustment sleeve 207 may be connected to the circular and square tube 300 by welding.

As shown in fig. 6 and 7, the fiber stub of the fiber adapter 206 is a sectional structure, but the present application may also use a fiber stub integrated structure, and the present application only exemplifies a sectional fiber stub.

In the optical module that this application embodiment provided, for realizing smoothly receiving the split of signal light and transmission signal light and reducing the return loss of light reception, optical assembly includes first filter and speculum. Fig. 7 is a first cross sectional view of the round and square tube body provided in the embodiment of the present application, in which an optical component is disposed, and fig. 7 clearly shows the specific arrangement of the optical component in the round and square tube body 300 provided in the embodiment of the present application. As shown in fig. 7, the optical assembly includes a first filter 301 and a reflector 302, the first filter 301 and the reflector 302 being disposed in the inner cavity of the circular-square tube 300; the first filter 301 and the mirror 302 are used in combination to realize wavelength division multiplexing of the first wavelength signal light and the second wavelength signal light having a wavelength difference of less than 60 nm. The first filter 301 is used for transmitting the signal light generated by the light emitting module 400 and reflecting the signal light from the outside of the optical module to the reflector 302, and the reflector 302 is used for reflecting the signal light from the outside of the optical module to the light receiving module 500.

Optionally, the first filter 301 and the reflector 302 are respectively obliquely disposed in the inner cavity of the circular tube 300, the first filter 301 is disposed on an output light path of the optical transmission assembly 400, and a first wavelength signal light generated by the optical transmission assembly 400 passes through the first filter 301 and then is transmitted to the optical fiber adapter 206; the first filter 301 is inclined toward the reflector 302, the reflection light path of the reflector 302 points to the light receiving assembly 500, and then the second wavelength signal light from the outside of the optical module is transmitted to the inner cavity of the round tube 300 through the optical fiber adapter 206, and when the second wavelength signal light is transmitted to the first filter 301 and is reflected by the first filter 301 to be transmitted to the reflector 302, the second wavelength signal light is transmitted to the light receiving assembly 500 through the reflector 302.

Generally, the optical axis of the signal light output from the light emitting module 400 is parallel to the central axis of the round-square tube 300, and the receiving optical axis of the light receiving module 500 is perpendicular to the central axis of the round-square tube 300. Further optionally, the inclination angle of the first filter 301 may be set to 11 °, that is, the included angle between the light-transmitting surface of the first filter 301 and the central axis of the circular tube 300 is 79 °; the inclination angle of the reflector 302 can be set to 34 °, that is, the included angle between the reflecting surface of the reflector 302 and the central axis of the round and square tube 300 is 34 °. However, the tilt angles of the first filter 301 and the mirror 302 are not limited thereto in this application, and can be specifically adjusted in combination with the wavelength of the received signal light, the actual wavelength of the transmitted signal light, and the return loss requirement of the light receiving module 500.

Therefore, in the embodiment of the present application, wavelength division multiplexing of the first wavelength signal light and the second wavelength signal light in the optical module is implemented through the first filter 301 and the reflector 302, and when the wavelength of the received signal light is closer to that of the transmitted signal light, it is convenient to achieve wavelength division of the received signal light and the transmitted signal light through adjustment of the inclination angle of the first filter 301 in the circular tube 300, so as to ensure that the wavelength of the received signal light and the wavelength of the transmitted signal light is closer to that of optical transmission and optical reception in the optical module, and smooth implementation of wavelength division multiplexing is ensured.

Further, in this embodiment of the application, the optical component further includes an isolator 303, the isolator 303 is disposed on the output optical path of the optical transmission component 400, and is located between the optical transmission component 400 and the first filter 301, so as to prevent the portion of the original optical path reflected back by the first filter 301 in the signal light output by the optical transmission component 400 from returning to the optical transmission component 400, and effectively avoid the reflected signal light from interfering with the optical transmission component 400, so as to ensure the quality of the signal light output by the optical transmission component 400. Optionally, the isolator 303 is embedded in the circular-square tube 300.

Further, in the embodiment of the present application, the optical assembly further includes a first lens 304, the first lens 304 is disposed in the inner cavity of the round-square tube 300, and the first lens 304 is disposed between the first filter 301 and the fiber adapter 206. In one aspect, the first wavelength signal light generated by the light emitting module 400 passing through the first lens 304 is converged and transmitted to the fiber adapter 206 through the first lens 304, and the first lens 304 is further used to improve the coupling efficiency of the first wavelength signal light generated by the light emitting module 400 to the fiber adapter 206. On the other hand, the second wavelength signal light from the outside of the optical module is transmitted to the first lens 304 through the optical fiber adapter 206, the first lens 304 collimates the signal light, the divergent light converts the signal light into parallel light, and the light is transmitted to the light receiving assembly through the first filter 301 and the reflector 302.

The optical module provided in the embodiment of the present application further includes a second lens, where the second lens is used to collimate the signal light generated by the light emitting assembly 400 and convert divergent signal light generated by the light emitting assembly 400 into parallel light. Alternatively, a second lens may be provided in the light emitting assembly 400; a second lens may be disposed in the output optical path of the light emitting assembly 400, such as between the light emitting assembly 400 and the isolator 303.

Furthermore, in this embodiment, the optical assembly further includes a second filter 305, the second filter 305 is disposed in the circular-square tube 300, the second filter 305 is disposed between the reflector 302 and the light receiving assembly 500, and the second filter 305 is disposed on the reflective light path of the reflector 302, the second filter 305 is used for filtering stray light in the signal light emitted from the reflector 302 to the light receiving assembly 500, so as to ensure the quality of the signal light received by the light receiving assembly 500. In order to facilitate the installation of the second filter 305, the optical assembly further includes a filter support 306, the second filter 305 is disposed between the reflector 302 and the light receiving assembly 500 through the filter support 306, and the filter support 306 facilitates the fixed arrangement of the second filter 305 in the circular-square tube 300.

Optionally, the filter holder 306 is provided with a first through hole, the first through hole is used for transmitting light, the second filter 305 covers the first through hole, and then the light is transmitted to the second filter 305 through the first through hole, and then the second filter 305 selectively transmits the light according to the wavelength of the light transmitted to the second filter 305. Usually, the second filter 305 is fixedly connected to the filter holder 306 by dispensing, and when the second filter 305 and the filter holder 306 are fixedly connected by dispensing, if the dispensing amount is a little more, a little more glue can flow to the first through hole, and then the second filter 305 can be prevented from being contaminated by the glue when the second filter 305 is fixedly dispensed by the first through hole. Preferably, the first through hole is a stepped hole, which facilitates fixing the second filter 305 and prevents glue from contaminating the second filter 305 when the second filter 305 and the filter support 306 are fixedly connected by dispensing.

Solid arrows in fig. 7 are used to indicate signal light transmission paths generated by the light emitting module 400. The signal light generated by the light emitting module 400 enters the round and square tube 300 from the left end of the round and square tube 300, is transmitted to the isolator 303, is transmitted to the first filter 301 through the isolator 303, is transmitted to the first lens 304 through the first filter 301, and is converged by the first lens 304 to the optical fiber adapter 206 and is transmitted to the external optical fiber through the optical fiber adapter 206.

Fig. 8 is a receiving optical path diagram of an optical receiving module in an embodiment of the present application, where a dotted arrow indicates a transmission optical path of signal light from outside an optical module. As shown in fig. 8, the signal light from outside the optical module is transmitted to the optical fiber adapter 206 through an external optical fiber, then transmitted to the first lens 304 through the optical fiber adapter 206, collimated by the first lens 304, and transmitted to the first filter 301, and the signal light is reflected to the reflector 302 by the first filter 301, then transmitted to the first filter 301 by the reflector 302, and finally transmitted to the light receiving module 500 after being filtered by the first filter 301.

In the embodiment of the present application, the optical transmitter module 400 and the optical receiver module 500 may be in a TO package form, but are not limited TO the TO package form, and the optical transmitter module 400 may be in an XMD package form. In order to facilitate the connection between the XMD package type light emitting assembly 400 and the round-square tube 300, the optical module provided in the embodiment of the present application further includes a connection socket. With reference to fig. 6-8, the optical module provided in the embodiment of the present application further includes a connection socket 208, the connection socket 208 is disposed at one end of the round and square tube 300, one end of the connection socket 208 is connected to the round and square tube 300, and the other end is connected to the light emitting assembly 400.

In the optical module provided in the embodiment of the present application, in order to accurately set optical components such as the first filter 301 and the reflector 302 in the circular-square tube 300, a mounting hole is provided on a side wall of the circular-square tube 300. Fig. 9 is a first schematic structural view of a round and square tube according to an embodiment of the present application, and fig. 10 is a second schematic structural view of a round and square tube according to an embodiment of the present application. As shown in fig. 9 and 10, a mounting hole 307 is formed on the sidewall of the round-square tube 300, and a cover plate 3071 is disposed on the mounting hole 307; optical component installations such as first filter 301 and speculum 302 set up in circle square tube body 300 through mounting hole 307, and after optical component assembly such as first filter 301 and speculum 302 accomplished, close mounting hole 307 with apron 3071 lid, realize the relative sealing of circle square tube body 300 through apron 3071. In the embodiment of the present application, the number and size of the mounting holes 307 can be selected according to the requirements. The mounting hole 307 is not provided on the side of the circular-square tube 300 where the light emitting module 400 and the light receiving module 500 are not provided.

Fig. 11 is a second cross-sectional view of a circular-square tube provided in the present application, in which no optical component is disposed. As shown in fig. 11, a first inclined plane 300-1 and a second inclined plane 300-2 are disposed in an inner cavity of the round and square tube 300, the first inclined plane 300-1 is used for carrying and disposing a first filter 301, and the second inclined plane 300-2 is used for carrying and disposing a reflector 302. Optionally, the inclination angles of the first inclined plane 300-1 and the second inclined plane 300-2 are set according to the inclination angle requirements of the first filter 301 and the reflector 302, so that the first filter 301 and the reflector 302 can be conveniently arranged in the round and square tube 300 through the first inclined plane 300-1 and the second inclined plane 300-2.

Further, the round and square tube 300 is provided with an isolator mounting hole 300-3, the isolator mounting hole 300-3 is communicated with the connecting seat 208 and the inner cavity of the round and square tube 300, and the isolator mounting hole 300-3 is used for arranging an isolator 303, so that the arrangement of the isolator 303 is facilitated and the mounting precision of the isolator 303 is ensured. Meanwhile, the coupling seat 208 is provided to facilitate installation of the isolator 303 in cooperation with the isolator mounting hole 300-3.

Further, a lens mounting table 300-4 is further disposed in the inner cavity of the round and square tube 300, the lens mounting table 300-4 is used for supporting and disposing the first lens 304, and the lens mounting table 300-4 facilitates mounting and positioning of the first lens 304. Optionally, a lens mounting hole is formed in the lens mounting stage 300-4, the first lens 304 is clamped in the lens mounting hole, and the lens mounting stage 300-4 provided with the lens mounting hole is more convenient for mounting and positioning the first lens 304.

In the embodiment of the present application, the receiving and mounting hole 300-5 is formed in the round and square tube 300, the receiving and mounting hole 300-5 is communicated with the inner cavity of the round and square tube 300, the cap end of the light receiving module 500 is clamped in the receiving and mounting hole 300-5, and the receiving and mounting hole 300-5 facilitates the connection between the light receiving module 500 and the round and square tube 300. Optionally, an optical filter support 306 is disposed at one end of the receiving and mounting hole 300-5 close to the inner cavity of the round and square tube 300, and the other end of the receiving and mounting hole 300-5 is connected to the light receiving assembly 500; the filter support 306 is clamped in the receiving and mounting hole 300-5, and the receiving and mounting hole 300-5 is used for facilitating the accurate arrangement of the filter support 306 and the light receiving assembly 500 and facilitating the assembly of the filter support 306 and the light receiving assembly 500.

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

Claims

1. A light module, comprising:

the round and square pipe body is provided with an inner cavity;

2. The light module of claim 1, wherein the optical assembly further comprises an isolator disposed between the light emitting assembly and the first filter.

3. The optical module according to claim 2, wherein an isolator mounting hole is formed in the circular-square tube, one side of the isolator mounting hole communicates with an inner cavity of the circular-square tube, and the isolator is disposed in the isolator mounting hole;

the other side of the isolator mounting hole is provided with a connecting seat, and the light emitting assembly is connected with the round and square tube body through the connecting seat.

4. The optical module of claim 1, further comprising an adjustment sleeve through which a fiber optic adapter of the optical module optically connects the round-square tube;

the optical assembly further includes a first lens disposed between the first filter and the fiber optic adapter.

5. The light module of claim 1, wherein the optical assembly further comprises a second filter disposed between the reflector and the light receiving assembly via a filter holder.

6. The optical module according to claim 1, wherein an inner cavity of the circular-square tube has a first inclined surface and a second inclined surface, the first filter is disposed on the first inclined surface, and the reflector is disposed on the second inclined surface.

7. The optical module according to claim 5, wherein a receiving mounting hole is formed in the round and square tube, and the receiving mounting hole communicates with an inner cavity of the round and square tube;

one end of the receiving mounting hole is provided with the optical filter bracket, and the other end of the receiving mounting hole is provided with the light receiving assembly.

8. The optical module of claim 4, wherein the inner cavity of the circular-square tube is provided with a lens mount, the lens mount supporting the first lens.

9. The optical module of claim 5, wherein the filter holder is provided with a stepped hole, and the second filter is provided in the stepped hole.

10. The optical module according to claim 6, wherein the first inclined surface has an inclination angle of 11 ° and the second inclined surface has an inclination angle of 34 °.