CN112230351B

CN112230351B - Optical module

Info

Publication number: CN112230351B
Application number: CN202011167400.3A
Authority: CN
Inventors: 刘鹏飞; 张华妮; 蔚永军; 张晓廓
Original assignee: Hisense Broadband Multimedia Technology Co Ltd
Current assignee: Hisense Broadband Multimedia Technology Co Ltd
Priority date: 2020-10-27
Filing date: 2020-10-27
Publication date: 2022-04-22
Anticipated expiration: 2040-10-27
Also published as: CN112230351A

Abstract

The application provides an optical module, includes: a circuit board; the optical sub-module is electrically connected with the circuit board; the optical subassembly includes: the tube seat comprises a pin, and the tube seat is electrically connected with the circuit board through the pin; the optical chip is arranged on the top surface of the tube seat; the pipe cap is covered on the pipe seat and forms a wrapping cavity with the pipe seat; and one side of the optical filter support is fixedly connected with the inner wall of the pipe cap, the other side of the optical filter support is fixedly connected with the optical filter, the optical filter support is used for fixedly arranging the optical filter at the top of the wrapping cavity, and the optical filter is used for filtering stray light between the pipe cap and the optical chip. The application provides an optical module, the light filter sets up in optics submodule, can avoid optics submodule to receive the parasitic light and cause the interference corresponding this received signal light, can occupy under the less space condition realization again to the filtering of parasitic light, can effectively sparingly set up the shared space of light filter, and then help the inside compact development of optical module.

Description

Optical module

Technical Field

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

Background

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

The photoelectric conversion device of the optical module mainly comprises two parts, namely a transmitting part and a receiving part. The transmitting part is generally called a TOSA (Transmitter Optical Subassembly) for converting an electrical signal into an Optical signal; the receiving part is generally called ROSA (Receiver Optical Subassembly) for converting an Optical signal received from outside the Optical module into an electrical signal. ROSAs CAN employ TO-CAN packaged products where a cap lens and a photodiode are the primary optics of the product. A single TO would only need TO receive a single wavelength of signal light, such as 1270 nm; in the specific use scenario BOSA of TO, the wavelength division multiplexing technology is generally involved, that is, there is also stray light with other wavelengths than 1270nm in the TO use environment; when stray light with other wavelengths except 1270nm enters the TO, interference is generated on signals received by the TO, and the performance of the optical module is poor.

Disclosure of Invention

The embodiment of the application provides an optical module, which is used for avoiding interference of stray light on received signals.

The application provides an optical module, includes:

a circuit board;

the optical sub-assembly is electrically connected with the circuit board;

wherein the optical subassembly comprises:

the tube seat comprises a pin, and the tube seat is electrically connected with the circuit board through the pin;

the optical chip is arranged on the top surface of the tube seat;

the pipe cap is covered on the pipe seat and forms a wrapping cavity with the pipe seat;

and the light filtering component comprises a light filter and a light filter support, one side of the light filter support is fixedly connected with the inner wall of the pipe cap, the other side of the light filter support is fixedly connected with the light filter, and the light filter support is used for fixedly arranging the light filter at the top of the wrapping cavity.

The application provides an optical module, including the optics submodule, set up the optical filtering subassembly in the parcel cavity that cap and tube socket formed, the optical filtering subassembly can be used to the miscellaneous light that the filtering got into in the optics submodule, and the optical filtering subassembly can be used to the filtering promptly and sees through the cap, treats the miscellaneous light that transmits to the optical chip. The optical filtering component can filter stray light entering the optical sub-module, so that the optical chip is prevented from receiving the stray light, and the optical sub-module is prevented from receiving the stray light and causing interference corresponding to the received signal light. Meanwhile, the optical filter assembly comprises an optical filter and an optical filter support, the optical filter is arranged on the inner wall of the pipe cap through the optical filter support, and then the optical filter is arranged inside the optical submodule.

Drawings

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

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

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

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

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

fig. 5 is a schematic diagram of an internal structure of an optical module according to an embodiment of the present disclosure;

FIG. 6 is a schematic diagram illustrating an outline of a light-receiving part according to an embodiment of the present disclosure;

fig. 7 is a structure diagram of a receiving optical path in an existing optical module;

FIG. 8 is an exploded view of a light receiving part according to an embodiment of the present disclosure;

fig. 9 is a cross-sectional view of a light receiving part according to an embodiment of the present application;

FIG. 10 is a cross-sectional view of an assembled cap and filter assembly according to an embodiment of the present disclosure;

FIG. 11 is a diagram illustrating another embodiment of a cap and filter assembly;

fig. 12 is an exploded view of another cap and filter assembly according to an embodiment of the present disclosure.

Detailed Description

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

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 of optical signals and electrical signals in the technical field of optical fiber communication, and the interconversion of the optical signals and the electrical signals is the core function of the optical module. The optical module is electrically connected with an external upper computer through a golden finger on an internal circuit board of the optical module, and the main electrical connection comprises power supply, I2C signals, data signals, grounding and the like; the 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 a greatly improved communication rate for the 5G communication, but the transmission attenuation of the signal is relatively obviously increased.

The new service characteristics and higher index requirements of 5G provide new challenges for the bearer network architecture and each layer of technical solutions, wherein the optical module serving as a basic constituent unit of the physical layer of the 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 an embodiment of the present application includes an upper housing 201, a lower housing 202, a circuit board 203, a circular-square tube 300, a light emitting part 400, and a light receiving part 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; optoelectronic devices such as the circuit board 203, the circular-square tube 300, the light emitting part 400, and the light receiving part 500 are located in the package cavities formed in the upper and lower cases.

The upper shell 201 and the lower shell 202 are combined in an assembly mode, so that devices such as the round square tube body 300, the light emitting component 400, the light receiving component 500 and the like can be conveniently installed in the shells, and the outermost packaging protection shell of the optical module is formed by the upper shell 201 and the lower shell 202; 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.

The light emitting part and the light receiving part may be collectively referred to as an optical sub-module. As shown in fig. 4, the present embodiment provides an optical module in which a light emitting part 400 and a light receiving part 500 are both disposed on a circular square tube 300, the light emitting part 400 is used to generate and output signal light, and the light receiving part 500 is used to receive signal light from the outside of the optical module. The round and square tube 300 is provided with an optical fiber adapter for connecting an optical module with an external optical fiber, and the round and square tube 300 is usually provided with a lens assembly for changing the propagation direction of the signal light output from the light emitting part 400 or the signal light input from the external optical fiber. The light emitting part 400 and the light receiving part 500 are physically separated from the circuit board 203, and thus it is difficult to directly connect the light emitting part 400 and the light receiving part 500 to the circuit board 203, so that the light emitting part 400 and the light receiving part 500 are electrically connected through a flexible circuit board, respectively, in the embodiment of the present application. However, in the embodiment of the present application, the assembling structure of the light emitting part 400 and the light receiving part 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 an internal structural schematic diagram of an optical module according to an embodiment of the present application. As shown in fig. 5, an optical module 200 according to an embodiment of the present application includes a circular-square tube 300, a light emitting part 400, and a light receiving part 500. The light emitting part 400 is arranged on the round and square tube 300 and is coaxial with the optical fiber adapter of the round and square tube 300, and the light receiving part 500 is arranged at the side of the round and square tube 300 and is not coaxial with the optical fiber adapter; however, in the embodiment of the present application, the light receiving member 500 may be coaxial with the optical fiber adapter, and the light emitting member 400 may be non-coaxial with the optical fiber adapter. The light emitting part 400 and the light receiving part 500 are configured to be a round-square tube 300, which facilitates the control of the signal light transmission path, the compact design of the interior of the optical module, and the reduction of the space occupied by the signal light transmission path. In addition, with the development of the wavelength division multiplexing technology, in some optical modules, more than one light emitting part 400 and light receiving part 500 are disposed on the circular square tube body 300.

In some embodiments of the present application, a transflective mirror is further disposed in the circular-square tube 300, and the transflective mirror is used to change the propagation direction of the signal light to be received by the light receiving part 500 or change the propagation direction of the signal light generated by the light emitting part 400, so as to facilitate the output of the signal light received by the light receiving part 500 or the signal light generated by the light emitting part 400.

Fig. 6 is a structural diagram of an external shape of a light receiving part according to an embodiment of the present application. As shown in fig. 6, the light receiving part 500 provided in the embodiment of the present application includes a stem 510, a cap 520, and other devices such as an optical chip disposed in the cap 520 and the stem 510, the optical chip being configured to receive signal light and convert an optical signal into a current signal. The tube cap 520 covers one end of the tube base 510, so that the tube cap 520 and the tube base 510 form a wrapped cavity, and other devices such as a photonic chip are arranged in the wrapped cavity formed by the tube cap 520 and the tube base 510 and are usually fixed on the tube base 510; in addition, the socket 510 includes a plurality of pins for electrically connecting the flexible circuit board to other electrical devices in the light receiving part 500, and further electrically connecting the light receiving part 500 to the circuit board 203.

The cap 520 may be a glass cap or a plastic cap, etc. Optionally, a lens 530 is disposed on the cap 520, i.e., a lens is disposed on the top of the cap 520 as shown in fig. 6. The lens 530 serves to focus the signal light toward the optical chip.

When the light emitting device 400 and the light receiving device 500 are fixed on the circular tube 300 at the same time, or when more than one light emitting device 400 or light receiving device 500 is mounted on the circular tube 300 by using the wavelength division multiplexing technology, there will be multiple optical paths for signal lights with different wavelengths in the circular tube 300, ideally, the signal lights with different wavelengths are transmitted according to the set optical path, and then the light receiving device 500 for receiving the signal light with a certain wavelength only receives the signal light with the certain wavelength, however, other wavelength stray lights will be possibly transmitted to the light receiving device 500 due to the characteristics of light reflection, refraction, etc., and when the light receiving device 500 receives other wavelength stray lights, it will inevitably interfere with the signal that the light receiving device 500 should receive, and when the interference reaches a certain degree, the quality of the received signal will be affected, resulting in poor performance of the optical module.

The conventional solution is to provide an optical filter in the circular-square tube 300, and the optical filter is disposed on the transmission light path of the light receiving part 500 to be received, the optical filter usually only allows light with a specific wavelength or wavelength range to pass through, and stray light in the signal light to be received by the light receiving part 500 is filtered by the optical filter, so as to prevent the stray light from being transmitted to the light receiving part 500 and entering the light receiving part 500 to be received by the optical chip.

Fig. 7 is a structure diagram of a receiving optical path in a conventional optical module. As shown in fig. 7, in the optical module, the light receiving part 03 is configured to receive signal light of two wavelengths (which is distinguished by solid line arrows and dotted line arrows in the figure), the signal light of the two wavelengths is transmitted to the mirror 01, the signal light of the solid line arrows is mainly reflected by the mirror 01, the signal light of the dotted line arrows is mainly transmitted by the mirror 01, but the signal light of the normally unavoidable dotted line arrows is partially reflected by the mirror 01, the reflected signal light is transmitted to the light receiving part 03, an optical filter 02 is disposed on a receiving light path of the light receiving part 03, and the optical filter is configured to filter the signal light of the dotted line arrows reflected by the mirror, so as to prevent the signal light of the dotted line arrows from entering the light receiving part 03 and being received by an optical chip therein.

However, the demand for the compactness of the interior of the optical module is continuously increasing, the space left for arranging the filter is less and less, and if the interior of the optical module is to be more compact, the filter will interfere with the light receiving part, the transflective mirror and the like. The application provides a novel light receiving part, can avoid the miscellaneous light to form the interference to the signal that light receiving part received, can satisfy the inside compact requirement of optical module again simultaneously.

Fig. 8 is an exploded view of a light receiving part according to an embodiment of the present application. As shown in fig. 8, the optical chip 511 is fixedly disposed on the stem 510 and electrically connected to corresponding pins of the stem 510, and other devices, such as a transimpedance amplifier, etc., outside the optical chip 511 are disposed on the stem.

The light receiving part 500 provided in the embodiment of the present application further includes a filter assembly 540, and the filter assembly 540 mainly includes an optical filter for filtering out signal light outside the wavelength or wavelength range of the received signal light specified by the light receiving part 500. In the embodiment of the present application, the light filtering component 540 is disposed in a package cavity formed by the cap 520 and the socket 510, and the light filtering component 540 is disposed on the receiving optical path of the optical chip 511, so as to filter stray light entering the package cavity through the cap 520.

As shown in fig. 8, the filter assembly 540 includes a filter 541 and a filter holder 542; the optical filter 541 is used for the light receiving component 500 to receive signal light beyond the wavelength or wavelength range of the signal light, that is, the optical filter 541 is used for filtering stray light entering the tube cap 520 through the tube cap 520 and forming a package cavity with the tube base 510, so as to prevent the stray light from being transmitted to the optical chip 511 and received; the optical filter 541 is arranged on the optical filter support 542, the tube cap 520 and the optical filter 541 are fixedly connected through the optical filter support 542, the optical filter support 542 is convenient for fixing the optical filter 541 in a wrapping cavity formed by the tube cap 520 and the tube seat 510, and if glue is used for fixing the optical filter 541, the glue is effectively prevented from polluting the optical filter 541; meanwhile, it is convenient to control a required size of the optical filter 541, and generally, the price of the optical filter 541 is related to its size, thereby facilitating control of the cost of the light receiving part 500. Optionally, the filter support 542 is provided with a first through hole 5421, the first through hole 5421 is used for transmitting light, the filter 541 covers the first through hole 5421, the light is further transmitted to the filter 541 through the first through hole 5421, and then the filter 541 selectively transmits the light according to the wavelength of the light transmitted to the filter 541. When the optical filter 541 and the optical filter support 542 are fixedly connected by dispensing, if the dispensing amount is a little larger, a little more glue can flow to the first through hole 5421, and further the optical filter 541 can be prevented from being contaminated by the glue when the optical filter 541 is fixedly dispensed by the first through hole 5421. Optionally, the first through hole 5421 is a circular through hole for facilitating the use of the lens 530.

Fig. 9 is a cross-sectional view of a light receiving part according to an embodiment of the present application. As shown in fig. 9, the filter support 542 is located in the packaging cavity formed by the cap 520 and the socket 510, and the filter support 542 is connected to the top sidewall of the cap 520; the light converged by the lens 530 is transmitted to the filter 541 through the first through hole 5421, the filter 541 is used for filtering out stray light therein, and the light beam transmitted through the filter 541 is transmitted to the optical chip 511. Further, the size of the filter 541 is optional, and the filter 541 covers the light spot on the filter 541 after being converged by the lens 530.

As shown in fig. 9, the signal light (indicated by a solid arrow) to be received by the optical chip 511 and other stray light (indicated by a dashed arrow) with a wavelength enter a package cavity formed by the cap 520 and the socket 510 through the lens 530, and then are transmitted to the optical filter 541 through the first through hole 5421, the optical filter 541 transmits the signal light to be received and filters the stray light, and finally the signal light transmitted through the optical filter 541 is transmitted to the optical chip 511, and the optical chip 511 receives the signal light with a specific wavelength or wavelength range transmitted thereto. In the light receiving part 500 provided in this embodiment of the present application, the optical filter 541 is disposed in the package cavity formed by the cap 520 and the socket 510 for filtering out the stray light transmitted into the light receiving part 500 to prevent the optical chip 511 from receiving the chiseled light, so as to prevent the light receiving part from receiving the stray light and causing interference to the received signal light.

In addition, the optical filter 541 is fixed in the package cavity formed by the cap 520 and the base 510 through the filter support 542, and the size of the optical filter 541 is intersected with the original optical filter arranged outside the light receiving part 500, so that the space occupied by arranging the optical filter outside the light receiving part 500 can be effectively reduced, and the internal compact development of the optical module is facilitated.

Fig. 10 is a cross-sectional view of an assembled cap and filter assembly according to an embodiment of the present disclosure. As shown in fig. 10, a second through hole 521 is disposed at the top of the cap 520, and the bottom end of the lens 530 is clamped in the second through hole 521; this facilitates the fixed arrangement of the lens on the cap 520. Alternatively, the lens 530 has a relatively small bottom end, and is inserted into the second through hole 521, and then the lens 530 is attached to the cap 520 by dispensing water.

As shown in fig. 10, a second step 522 is provided on the top inner wall of the cap 520, and the filter holder 542 is connected to the second step 522; the second step 522 facilitates the positioning and securing of the filter holder 542 on the top inner wall of the cap 520. Alternatively, the filter holder 542 may be fixedly coupled to the second step 522 by glue. Further, the second step 522 and the second through hole 521 form a first groove 523, so that when the filter support 542 and the cap 520 are connected by dispensing, the lens 530 can be effectively prevented from being contaminated by glue, and the use quality of the lens 530 can be ensured.

As shown in fig. 10, the filter holder 542 is further provided with a first step 5422. Optionally, the edge of the optical filter 541 contacts and is fixedly connected to the first step 5422, for example, by gluing the optical filter 541 with glue. Alternatively, the first step 5422 on the filter holder 542 forms a second groove 5423 at the end face of the first through hole 5421, and the filter 541 is disposed in the second groove 5423. Preferably, the optical filter 541 is clamped in the second groove 5423, so as to facilitate positioning during the process of adhering the optical filter 541.

Fig. 11 is a diagram illustrating a state of another tube cap and a filter assembly according to an embodiment of the present disclosure, and fig. 12 is an exploded view of another tube cap and a filter assembly according to an embodiment of the present disclosure. As shown in fig. 11 and 12, the first step 5422 disposed on the filter holder 542 provided in this embodiment is an annular step, and then the first step 5422 forms a second groove 5423 on the end surface of the first through hole 5421 as an annular groove, the filter 541 is a square filter, and the filter 541 is clamped in the second groove 5423. Thus, the filter 541 can be more conveniently fixed to the filter holder 542, and the size of the filter 541 can be further controlled. Optionally, the ribs of the filter 541 are coupled to the sidewalls of the second recess 5423, so as to further effectively control the size of the filter 541. Optionally, the filter holder 542 is an annular sheet-like structure.

As shown in fig. 11 and 12, the second step 522 disposed on the top inner wall of the pipe cap 520 is an annular step, the second step 522 forms a first groove 523 on the end surface of the second through hole 521 as an annular groove, and a central axis of the first groove 523 coincides with a central axis of the second through hole 521, that is, the first groove 523 is coaxial with the second through hole 521. Therefore, when the filter support 542 is in an annular sheet structure, the filter support 542 can be conveniently positioned by the annular step-shaped second step 522, and the first groove 523 in the shape of an annular groove can be used for preventing glue from polluting the lens 530 when the filter support 542 and the tube cap 520 are fixedly connected by glue. Thus, the annular sheet-shaped filter holder 542 is combined with the second step 522 to form an annular step, which facilitates the arrangement of the filter 541 in the light-receiving component 500, facilitates the implementation of the filter 541 inside, and effectively saves the space occupied by the filter.

In the optical module provided by the embodiment of the application, the optical filter is suitable for the light receiving part through the technology of arranging the light receiving part on the optical filter support, and can also be applied to the light emitting part, and light generated by an optical chip in the light emitting part is filtered by the optical filter and then emitted out of the light emitting part.

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:

a circuit board;

the optical sub-assembly is electrically connected with the circuit board;

wherein the optical subassembly comprises:

the optical chip is arranged on the top surface of the tube seat;

the optical filter assembly is arranged in a wrapping cavity formed by the tube cap and the tube seat and comprises an optical filter and an optical filter support, one side of the optical filter support is fixedly connected with the inner wall of the tube cap, the other side of the optical filter support is fixedly connected with the optical filter, and the optical filter support is used for fixedly arranging the optical filter at the top of the wrapping cavity; the light filter support is provided with a first through hole, a second groove is formed in one side, far away from the light filter support and the inner wall of the pipe cap, of the light filter support, the second groove is connected and communicated with the first through hole, the light filter is arranged in the second groove, and the light transmitting surface of the light filter is in contact with the bottom surface of the second groove.

2. The optical module as claimed in claim 1, wherein a lens is disposed on the cap, the lens is configured to focus a light beam to the optical filter, and the light beam transmitted through the optical filter is transmitted to the optical chip.

3. The optical module as claimed in claim 2, wherein the cap is provided with a second through hole, and the lens is embedded in the second through hole.

4. The optical module of claim 1, further comprising a round square tube, wherein the optical sub-module is disposed on the round square tube.

5. The optical module according to claim 4, wherein a transflective lens is further disposed in the circular-square tube, and the transflective lens reflects the signal light to be received by the optical sub-module to the optical sub-module.

6. The optical module as claimed in claim 3, wherein a second step is disposed on an inner wall of the top of the cap, and a first groove is formed between the second step and the second through hole, and the second step is connected to the filter holder.

7. The optical module of claim 1, wherein the second recess is an annular groove, the optical filter is a square optical filter, and the optical filter is clamped in the annular groove.

8. The optical module of claim 6, wherein the first recess is an annular groove, and a central axis of the annular groove coincides with a central axis of the second through hole.

9. The optical module of claim 1, wherein the first through hole is a circular through hole.