CN212083736U - Optical module - Google Patents

Abstract

The application discloses optical module, including circuit board and light receiving and dispatching subassembly, the light receiving and dispatching subassembly includes: the two opposite ends of the tube body are respectively provided with a first jack and a second jack, the third end of the tube body is provided with a third jack, and a light through hole is formed between the first jack and the second jack; the light emitting device is inserted into the first jack; the optical fiber adapter comprises an optical fiber inserting core positioned in the second inserting hole and used for receiving an optical signal emitted by the light emitting device; the optical filter is arranged between the first jack and the second jack and used for transmitting the optical signal emitted by the light emitting device and reflecting the optical signal from the optical fiber ferrule; the light receiving device is inserted into the third jack; and the black glue layer is arranged on the inner wall of the light through hole and is used for absorbing the optical signal reflected by the end face of the optical fiber ferrule. This application is through setting up the black glue layer on the body inner wall and absorbing the inside stray light/reverberation of body, has avoided the reverberation to get into in the light emission device, has improved the luminous performance of light emission device.

Description

Optical module

Technical Field

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

Background

The optical module is mainly used for photoelectric and electro-optical conversion, an electric signal is converted into an optical signal by a transmitting end of the optical module and is transmitted out through an optical fiber, and a received optical signal is converted into an electric signal by a receiving end of the optical module. In a high-speed information transceiving system, a high-density optical module is required to replace a conventional optical module, and a multi-channel optical transceiving technology is adopted, so that more transmitters and receivers can be concentrated in a smaller space. In such a high-speed transceiver module, a core component is a BOSA (Bi-directional optical Sub-Assembly) structure in an optical module.

The commonly used BOSA structure comprises a tube body, a light emitting device, a light receiving device and an optical fiber adapter, wherein the light emitting device is arranged at one end of the tube body, the optical fiber adapter is arranged at the other end of the tube body, an optical fiber is arranged in the optical fiber adapter, the light receiving device is arranged at the upper end of the tube body, an optical filter is arranged in the tube body, and a light beam emitted by the light emitting device is coupled into the optical fiber through the optical filter and is transmitted out through the optical fiber; the light beam transmitted by the optical fiber enters the light receiving device after being reflected by the optical filter.

However, in the process of coupling light emitted by the light emitting device into the optical fiber, a part of the light is reflected back through the end face of the optical fiber, and a part of the reflected light enters the light emitting device again, so that the light emitting performance of the light emitting device is affected.

SUMMERY OF THE UTILITY MODEL

The application provides an optical module to solve the influence of reverberation to the light-emitting of light-emitting device in present BOSA structure.

In order to solve the technical problem, the embodiment of the application discloses the following technical scheme:

in a first aspect, an embodiment of the present application discloses an optical module, including:

a circuit board;

the optical transceiving component is electrically connected with the circuit board and is used for transmitting and receiving optical signals;

wherein the optical transceiver component comprises:

the light-transmitting tube comprises a tube body, a first light-transmitting hole and a second light-transmitting hole, wherein the two opposite ends of the tube body are respectively provided with a first jack and a second jack, the third end of the tube body is provided with a third jack, a light-transmitting hole is arranged between the first jack and the second jack, and the light-transmitting hole is communicated with the first jack;

the light emitting device is inserted into the first jack, is electrically connected with the circuit board and is used for emitting a light signal, and the light signal penetrates through the light through hole;

the optical fiber adapter is inserted in the second jack, comprises an optical fiber inserting core positioned in the second jack and is used for receiving the optical signal transmitted by the light emitting device;

the optical filter is arranged between the first jack and the second jack and used for transmitting the optical signal emitted by the light emitting device and reflecting the optical signal from the optical fiber ferrule;

the light receiving device is inserted in the third jack, is electrically connected with the circuit board and is used for receiving the light signal reflected by the optical filter;

and the black glue layer is arranged on the inner wall of the light through hole and is used for absorbing the optical signal reflected by the end face of the optical fiber inserting core and emitted by the light emitting device.

According to the optical module, the first jack and the second jack are oppositely arranged on the tube body of the optical transceiving component, the third jack is arranged on the third end face of the tube body, and the light emitting device is inserted into the first jack, so that the fixed connection between the light emitting device and the tube body is realized, and the light emitting device is used for emitting optical signals; the optical fiber adapter is inserted in the second jack and comprises an optical fiber inserting core positioned in the second jack and used for receiving an optical signal emitted by the light emitting device; an optical filter is arranged in the inner cavity of the tube body between the first jack and the second jack and used for transmitting optical signals emitted by the light emitting device and reflecting the optical signals from the optical fiber ferrule; the optical receiving device is inserted into the third jack, so that the optical receiving device is fixedly connected with the tube body and is used for receiving optical signals reflected by the optical filter; the optical fiber transmission device comprises a light source, a first jack, a light filter, a black glue layer and a light transmitting device, wherein the light transmitting device is arranged in the light source, the light filter is arranged in the light source, the light transmitting device is arranged in the light filter, the light transmitting device is arranged in the light source, the light transmitting device is arranged. This application is through setting up the black glue layer on the body inner wall and absorbing the inside stray light/reverberation of body, can reduce the internal reflection of light receiving and dispatching subassembly, improves light emitting device's luminous performance.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Drawings

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

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

fig. 2 is a schematic structural diagram of an optical network terminal;

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

fig. 4 is an exploded schematic structural diagram of an optical module according to an embodiment of the present disclosure;

FIG. 5 is a schematic structural diagram of an optical transceiver module according to an embodiment of the present application;

FIG. 6 is an exploded view of an optical transceiver module according to an embodiment of the present application;

FIG. 7 is a schematic cross-sectional view of an optical transceiver module according to an embodiment of the present application;

FIG. 8 is an exploded cross-sectional view of an optical transceiver module according to an embodiment of the present application;

FIG. 9 is a diagram showing an optical path of a light emitting device after decentering and tilting in the embodiment of the present application;

FIG. 10 is another exploded cross-sectional view of an optical transceiver module according to an embodiment of the present application;

FIG. 11 is a side view of a tubular body according to an embodiment of the present application;

FIG. 12 is a schematic cross-sectional view of a tubular body according to an embodiment of the present application;

fig. 13 is an optical path diagram of reflected light of an optical signal passing through an end face of an optical fiber ferrule according to an embodiment of the present application.

Detailed Description

In order to make those skilled in the art better understand the technical solutions in the present application, 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 the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

One of the core links of optical fiber communication is the interconversion of optical and electrical signals. The optical fiber communication uses optical signals carrying information to transmit in information transmission equipment such as optical fibers/optical waveguides, and the information transmission with low cost and low loss can be realized by using the passive transmission characteristic of light in the optical fibers/optical waveguides; 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 information, grounding and the like; the electrical connection mode realized by the gold finger has become the mainstream connection mode of the optical module industry, and on the basis of the mainstream connection mode, the definition of the pin on the gold finger forms various industry protocols/specifications.

Fig. 1 is a schematic diagram of connection relationship of an optical communication terminal. As shown in fig. 1, the connection of the optical communication terminal mainly includes interconnection among the optical network terminal 100, the optical module 200, the optical fiber 101, and the network cable 103.

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

An optical port of the optical module 200 is externally accessed to the optical fiber 101, and establishes bidirectional optical signal connection with the optical fiber 101; an electrical port of the optical module 200 is externally connected to the optical network terminal 100, and establishes bidirectional electrical signal connection with the optical network terminal 100; the optical module realizes the mutual conversion of optical signals and electric signals, thereby realizing the establishment of information connection between the optical fiber and the optical network terminal. Specifically, the optical signal from the optical fiber is converted into an electrical signal by the optical module and then input to the optical network terminal 100, and the electrical signal from the optical network terminal 100 is converted into an optical signal by the optical module and input to the optical fiber.

The optical network terminal is provided with an optical module interface 102, which is used for accessing an optical module 200 and establishing bidirectional electric signal connection with the optical module 200; the optical network terminal is provided with a network cable interface 104, which is used for accessing the network cable 103 and establishing bidirectional electric signal connection with the network cable 103; the optical module 200 is connected to the network cable 103 via the optical network terminal 100. Specifically, the optical network terminal transmits a signal from the optical module to the network cable and transmits the signal from the network cable to the optical module, and the optical network terminal serves as an upper computer of the optical module to monitor the operation of the optical module.

At this point, a bidirectional signal transmission channel is established between the remote server and the local information processing device through the optical fiber, the optical module, the optical network terminal and the network cable.

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

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

The optical module 200 is inserted into the optical network terminal 100, specifically, an electrical port of the optical module is inserted into an electrical connector inside the cage 106, and an optical port of the optical module is connected to the optical fiber 101.

The cage 106 is positioned on the circuit board, and the electrical connector on the circuit board is wrapped in the cage, so that the electrical connector is arranged in the cage; the optical module is inserted into the cage, 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.

Fig. 3 is a schematic view of an optical module according to an embodiment of the present disclosure, and fig. 4 is a schematic view of an exploded structure of an optical module according to an embodiment of the present disclosure. As shown in fig. 3 and 4, an optical module 200 provided in the embodiment of the present application includes an upper housing 201, a lower housing 202, an unlocking member 203, a circuit board 300, and an optical transceiver module 400.

The upper shell 201 is covered on the lower shell 202 to form a wrapping cavity with two openings; the outer contour of the packaging cavity generally presents a square body. Specifically, the lower housing 202 includes a main board and two side boards located at two sides of the main board and arranged perpendicular to the main board; 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 may further include two side walls disposed at two sides of the cover plate and perpendicular to the cover plate, and the two side walls are combined with the two side plates to cover the upper shell 201 on the lower shell 202.

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 to connect with the optical transceiver module 400 inside the optical module; the photoelectric devices such as the circuit board 300 and the optical transceiver module 400 are positioned in the packaging cavity.

The assembly mode of combining the upper shell and the lower shell is adopted, so that the circuit board 300, the optical transceiver module 400 and other devices can be conveniently installed in the shells, and the upper shell and the lower shell form the outermost packaging protection shell of the module; the upper shell and the lower shell are made of metal materials generally, electromagnetic shielding and heat dissipation are achieved, the shell of the optical module cannot be made into an integral component generally, and therefore when devices such as a circuit board are assembled, the positioning component, the heat dissipation component and the electromagnetic shielding component cannot be installed, and production automation is not facilitated.

The unlocking component 203 is located on the outer wall of the wrapping cavity/lower shell 202, and is used for realizing the fixed connection between the optical module and the upper computer or releasing the fixed connection between the optical module and the upper computer.

The unlocking component 203 is provided with a clamping component matched with the upper computer cage; the end of the unlocking component can be pulled to enable the unlocking component to move relatively on the surface of the outer wall; the optical module is inserted into a cage of the upper computer, and the optical module is fixed in the cage of the upper computer by 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 300 is provided with circuit traces, electronic components (such as capacitors, resistors, triodes, and MOS transistors), and chips (such as an MCU, a laser driver chip, a limiting amplifier chip, a clock data recovery CDR, a power management chip, and a data processing chip DSP).

The circuit board 300 connects the electrical devices 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 is generally a hard circuit board, and the hard circuit board can also realize a bearing effect due to the relatively hard material of the hard circuit board, for example, the hard circuit board can stably bear a chip; when the optical transceiver component 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 module by using the flexible circuit board.

The optical transceiver module 400 in the optical module 200 includes an optical module for implementing optical signal and electrical signal conversion, and the optical module includes: the optical fiber adapter comprises a light emitting device, a tube body, a light receiving device and an optical fiber adapter, wherein one end of the light emitting device is connected with the circuit board 300, and the other end of the light emitting device is fixed in the tube body; the optical fiber adapter is fixed at the other end of the tube body, and an optical signal sent by the light emitting device enters an optical fiber inserting core in the optical fiber adapter through the tube body; the optical receiving device is fixed at the third end of the tube body, the central axis of the optical receiving device is generally vertical to the central axis of the light emitting device, and optical signals emitted by the optical fiber inserting core in the optical fiber adapter enter the optical receiving device after being reflected by the optical filter in the tube body.

The light emitting device comprises a light emitter and a lens, wherein the light emitter is used for emitting light beams, the light beams are converted into convergent light beams through the lens, and the convergent light beams are coupled into the optical fiber inserting core through the tube body. However, in the process that light emitted by the light emitter is coupled into the optical fiber ferrule, a part of the light is reflected back through the end face of the optical fiber ferrule, and a part of the reflected light enters the light emitter again, so that the light emitting performance of the light emitter is deteriorated, and the influence of the reflected light on the light emitter is reduced.

Fig. 5 is a schematic structural diagram of an optical transceiver module in an optical module according to an embodiment of the present application, and fig. 6 is an exploded schematic diagram of the optical transceiver module in the optical module according to the embodiment of the present application. As shown in fig. 5 and 6, the optical module provided in this embodiment of the present application includes an optical transceiver module 400, the optical transceiver module 400 includes a tube, an optical transmitter 403 and an optical fiber adapter 406, the optical transmitter 403 is configured to send an optical signal according to an electrical signal, the tube is configured to implement fixed connection between the optical transmitter 403 and the optical fiber adapter 406, the optical signal is transmitted into the optical fiber adapter 406 from the tube, an optical fiber ferrule 4061 is installed in the optical fiber adapter 406, the optical fiber ferrule 4061 is an optical fiber wrapped by ceramic, and the optical fiber ferrule 4061 implements emission of the optical signal.

The optical module provided in this embodiment implements transmission and reception of light through the same optical fiber, and therefore, the optical transceiver module 400 further includes an optical receiver 404 for converting an optical signal into an electrical signal, the optical signal transmitted into the tube body through the optical fiber ferrule 4061 in the optical fiber adapter 406 is reflected into the optical receiver 404 in the tube body, and is converted into the electrical signal through the optical receiver 404. The transmission of the optical signal converted from the electrical signal can be realized in the tube body and the optical signal is emitted by the optical fiber insertion core 4061, and the optical signal transmitted by the optical fiber insertion core 4061 can be sent to the optical receiving device 404 and converted into the electrical signal by the optical receiving device 404. For this purpose, the light emitting device 403, the light receiving device 404 and the optical fiber adapter 406 are fixed on the tube.

The body includes hollow square tubular body 401 and hollow circle body 402, and square tubular body 401 and circle body 402 all are equipped with the cavity. The round pipe body 402 and the square pipe body 401 can be assembled together by welding, and in order to ensure the structural strength of the optical module, a circle of black glue is required to be smeared at the joint of the round pipe body 402 and the square pipe body 401 for curing in a specific assembling process.

The round pipe body 402 is fixed on the outer side wall of the square pipe body 401, the axis of the round pipe body 402 is perpendicular to the outer side wall of the square pipe body 401, and the round pipe body 402 is communicated with the square pipe body 401. The round tube body 402 is nested with the light emitting device 403, the light emitting device 403 is installed in the round tube body 402, and the size of the round tube body 402 can be used for adjusting the distance between the light emitting device 403 and the optical fiber insertion core 4061 so as to meet the focal length requirement of the convergent light.

A light emitting device 403 is fixed to one end of the tube, a fiber optic adapter 406 is fixed to the other end of the tube, and a light receiving device 404 is fixed to the upper end of the tube. In order to realize fixation, the upper surface, the left side wall and the right side wall of the square tube body 401 are respectively provided with a jack, the jack of the left side wall is communicated with the round tube body 402, one end, away from the square tube body 401, of the round tube body 402 is provided with a first jack 4021, and the first jack 4021 is used for realizing the nested connection of the round tube body 402 and the light emitting device 403; a second jack 4011 on the right sidewall, that is, a jack disposed on the opposite side of the square tube 401 from the circular tube 402, where the second jack 4011 is used to implement the nested connection between the square tube 401 and the optical fiber adapter 406, and an optical fiber ferrule 4061 is installed in the optical fiber adapter 406, so that a light outlet of the light emitting device 403 is opposite to a receiving port of the optical fiber ferrule 4061; a third jack 4012 on the upper surface of the square tube body 401 is used to realize the nested connection between the light receiving device 404 and the square tube body 401.

Fig. 7 is a schematic cross-sectional view of an optical transceiver module according to an embodiment of the present application, and fig. 8 is an exploded schematic cross-sectional view of the optical transceiver module according to the embodiment of the present application. As shown in fig. 7 and 8, in order to realize that the optical signal transmitted into the tube body by the optical fiber ferrule 4061 is transmitted into the optical receiving device 404 again, a first optical filter 407 and a second optical filter 408 are required to be disposed in the square tube body 401, the first optical filter 407 is located between the optical transmitting device 403 and the optical fiber ferrule 4061, and the first optical filter 407 is installed at an angle, and the first optical filter 407 is inclined along a direction from the optical transmitting device 403 to the optical fiber ferrule 4061, so that the optical signal emitted by the optical transmitting device 403 enters the optical fiber ferrule 4061 after being transmitted through the first optical filter 407. The second filter 408 is located between the first filter 407 and the light receiving device 404, and the second filter 408 is perpendicular to the incident direction of the light path of the light receiving device 404.

In order to make the reflected optical signal enter the light receiving device 404 through the second optical filter 408, in this example, the inclination angle of the first optical filter 407 is preferably set to 45 °. The optical axis of the optical fiber ferrule 4061 is in the horizontal direction, and an optical signal emitted from the horizontal direction is reflected upward after passing through the first optical filter 407 inclined at 45 °, so that the reflected optical signal can pass through the second optical filter 408 vertically and enter the optical receiver 404, so as to convert the optical signal into an electrical signal.

The optical signal emitted from the light emitting device 403 can enter the optical fiber insert 4061 in the optical fiber adapter 406 and be emitted after being transmitted through the first optical filter 407. In the process of coupling the light emitted by the light emitting device 403 into the optical fiber ferrule 4061, a part of the light is reflected back through the end face of the optical fiber ferrule 4061, and also, diffuse reflection occurs, and a part of the reflected light and the diffusely reflected light reenter the light emitting device 403, which results in deterioration of the light emitting performance of the light emitting device 403. Therefore, in order to ensure the coupling efficiency of the optical module, the diffuse reflected light and the reflected light in the tube must be absorbed.

The optical transceiver module 400 further includes an adjusting ring 405, the adjusting ring 405 is disposed between the square tube 401 and the fiber adapter 406, the adjusting ring 405 is screwed on the square tube 401, and the distance between the light emitting device 403 and the fiber stub 4061 in the fiber adapter 406 can be adjusted by the adjusting ring 405.

The optical transmitting device 403 may be a coaxial TO package, and the optical transmitter may be a laser for transmitting an optical signal, and the optical signal transmitted by the laser is divergent light, so that a lens is disposed between the laser and the first optical filter 407 TO achieve convergence of the divergent light.

In order to avoid the influence on the coupling efficiency of the optical signal, in the optical module provided in this example, the isolator is removed, so that the loss of the isolator to light can be eliminated under the condition that the performance of the optical module is ensured, and the optical loss caused by the deviation of the isolator in the polarization direction during processing and the angular deviation during the installation of the isolator can be eliminated, so that the coupling efficiency during packaging is improved, the requirement on the power of the laser can be reduced, and the cost of the coaxial packaging optical module is greatly reduced.

In order to avoid that the reflected light enters the laser of the light emitting device 403 after the isolator is removed and the working performance of the laser is affected, the optical module provided by the example performs decentration and inclination processing at a certain angle when the laser is mounted, so that the optical axis of the light emitted by the laser and the central axis of the lens emit at a certain angle, and the possibility that the reflected light enters the laser is reduced. Specifically, the light emitting device 403 has a laser obliquely mounted therein such that the optical axis of light emitted from the laser is at an angle to the central axis of the lens.

Fig. 9 is an optical path diagram of a laser in an optical transceiver module according to an embodiment of the present application after being decentered and tilted. As shown in fig. 9, laser 4031 is tilted by about 1 ° to 10 ° so that the optical axis of light emitted from laser 4031 does not coincide with the central axis of lens 4032, and the central axis of lens 4032 is in the horizontal direction, so that the optical axis of light emitted from tilted laser 4031 forms an angle with the central axis of lens 4032. Since the optical axis of the optical fiber stub 4061 is horizontal, an angle is formed between the optical axis of the optical fiber stub 4061 and the optical axis of the light emitted from the laser 4031. The optical axis of light emitted from the tilted laser 4031 is shown by the dotted line portion indicated by the left arrow in fig. 9, the central axis of the lens 4032 is shown by the solid line portion indicated by the arrow located in the middle in fig. 9, and the optical axis of the fiber stub 4061 is shown by the solid line portion indicated by the right arrow in fig. 9. In this example, laser 4031 is tilted 4 ° and offset by 37 um.

Taking the tilted laser 4031 emitting three light waves as an example, three divergent light waves converge and emit after passing through the lens 4032, and the optical axes of the three divergent light waves are not coincident with the central axis of the lens 4032. After the converged light waves are filtered by the first optical filter 407, the light waves meeting the band requirement are coupled into the optical fiber insertion core 4061 in the optical fiber adapter 406, and the coupled light beams are emitted by the optical fiber insertion core 4061.

If the laser 4031 implements coaxial packaging according to a normal angle, that is, the optical axis of light emitted by the laser 4031 coincides with the central axis of the lens 4032, when the light wave emitted by the laser 4031 is converged by the lens 4032 and filtered by the first optical filter 407 and then coupled into the optical fiber ferrule 4061, the light wave converged enters the optical fiber ferrule 4061 and the optical axis of the optical fiber ferrule 4061 coincides. That is to say, when the laser 4031 is installed at a normal angle, a fixed optical signal transmission path (original optical path) is formed among the laser 4031, the lens 4032, the first optical filter 407, and the fiber stub 4061, so that when an optical signal is transmitted from the fiber stub 4061 to the optical receiving device 404, a part of the optical signal is reversibly transmitted back to the laser 4031 along the transmission path of the transmitted optical signal, that is, the optical signal transmitted from right to left passes through the first optical filter 407, enters the optical axis of the light emitted from the laser 4031 along the central axis of the lens 4032, and further enters the laser 4031, and the light emission performance of the laser 4031 is deteriorated.

Therefore, with the obliquely arranged laser 4031 provided in this example, the light wave reflected by the end face of the fiber stub 4061 will not be reversibly returned to the laser 4031 along the original optical path. Therefore, the laser 4031 is decentered and tilted by a certain angle, and the optical axis direction of light emitted by the laser 4031 is changed, so that the possibility that reflected light in the optical module enters the laser 4031 again can be reduced, and the light emitting performance of the laser 4031 is further prevented from being influenced.

Fig. 10 is another exploded cross-sectional view of the optical transceiver module provided in this example. As shown in fig. 10, in order to further eliminate stray light such as reflected light and diffuse reflection in the tube, a light through hole 4013 is disposed between the first insertion hole 4021 and the first optical filter 407 of the tube, the light through hole 4013 is communicated with the first insertion hole 4021, and an optical signal emitted by the light emitting device 403 can pass through the light through hole 4013 to be transmitted to the first optical filter 407, and is coupled to the optical fiber stub 4061 through the first optical filter 407.

The light passing hole 4013 provided in this example may adopt a tapered structure, that is, one end of the light passing hole 4013 close to the light emitting device 403 is provided with a light inlet, and the light passing hole 4013 is communicated with the first jack 4021 through the light inlet; one end of the light through hole 4013 close to the first optical filter 407 is provided with a light outlet, and the size of the light inlet is larger than that of the light outlet. From the light inlet to the light outlet, the cross-sectional area of the inner wall of the light through hole 4013 is gradually reduced, so that the light through hole 4013 has a structure with one large end and one small end.

The light emitted by the laser 4031 is divergent light, and converges after passing through the lens 4032, the light spot of the convergent light beam is gradually changed from a large light spot to a small light spot, the light inlet of the light through hole 4013 is larger than the light outlet, the light inlet can contain the light beam of the large light spot to enter, and the small light spot is emitted from the light outlet. In the process of size transition from the light inlet to the light outlet, the light spot of the convergent light beam also gradually becomes smaller, the shape of the convergent light beam is the same as the shape of the inner cavity outline of the light through hole 4013, so that most of the light wave converged by the lens 4032 can pass through the light through hole 4013, and no loss is generated to the light.

In order to absorb the reflected light, a black glue layer is arranged on the inner wall of the light through hole 4013 between the light outlet and the light inlet, and the light beam reflected by the end face of the optical fiber insertion core 4061 is absorbed by the black glue layer, so that the light beam is prevented from entering the laser 4031. One end of the light through hole 4013 close to the optical fiber insertion core 4061 is designed to be small-sized, that is, the size of the light outlet is smaller than that of the light inlet. The light irradiated on the end face of the optical fiber insertion core 4061 by the light wave is convergent light, and the convergent light is reflected back to be divergent light, namely, a light spot of the divergent light is converted from a small light spot to a large light spot, and is reflected to the light outlet end of the light through hole 4013 in the form of the large light spot. Since the light outlet is small, the diameter of the light outlet is smaller than that of the reflected light spot, so that most of the reflected light irradiates on the outer wall of the light through hole 4013 to prevent a part of light waves from entering the light through hole 4013 through the light outlet; and a part of light waves enter the light through hole 4013 from the light outlet and are absorbed by the black glue layer on the inner wall of the light through hole 4013, so that the light waves are prevented from returning to the laser 4031 through the light through hole 4013.

In this example, the black adhesive is coated on the inner wall of logical unthreaded hole 4013 through the point gluey needle, considers processing convenience and technical factor, can coat the black adhesive layer on the whole inner wall of logical unthreaded hole 4013, also can coat the black adhesive layer on the partial inner wall of logical unthreaded hole 4013, as long as it can absorb the light beam that the optic fibre lock pin 4061 terminal surface reflected back, avoid the light beam to get into in the optical transmission device can.

If the end face of the optical fiber ferrule 4061 is a straight end face, when the convergent light beam is transmitted to the end face of the optical fiber ferrule, a part of the light beam may be reflected back along the original path, so that the black glue layer on the inner wall of the light through hole 4013 cannot absorb the part of the reflected light. In order to avoid this problem, the end face of the optical fiber ferrule 4061 provided by the present application is an inclined end face, and this inclined end face is inclined upward in the direction from the first optical filter 407 to the second jack 4011, so that the incident optical path of the end face of the optical fiber ferrule is different from the reflected optical path, and the convergent light beam transmitted to the end face of the optical fiber ferrule is reflected upward to the left, so that it is conveniently absorbed by the black glue layer on the inner wall of the light through hole 4013.

Fig. 11 is a side view of a tube body in the optical transceiver module provided in this example. As shown in fig. 11, in order to further block the reflected light from passing through the light hole 4013, a shielding plate may be disposed at the light exit of the light hole 4013, a light hole 4014 is disposed on the shielding plate, and the light hole 4014 is communicated with the light hole 4013, so as to further reduce the size of the light exit of the light hole 4013 and block most of the reflected light from entering into the light hole 4013.

Fig. 12 is a cross-sectional view of another tube in the optical transceiver module provided in this example. As shown in fig. 12, the light through hole between the first jack 4021 and the first optical filter 407 in the tube may further include a first light through hole 4013 and a second light through hole 4015 that are communicated, the first light through hole 4013 is communicated with the first jack 4021, and the second light through hole 4015 is close to the fiber stub 4061. One end of the first light through hole 4013, which is close to the first jack 4021, is provided with a light inlet, and the first light through hole 4013 is communicated with the first jack 4021 through the light inlet; one end of the first light through hole 4013, which is close to the second light through hole 4015, is provided with a light outlet, and the first light through hole 4013 is communicated with the second light through hole 4015 through the light outlet.

In this example, the size of the light inlet of the first light passing hole 4013 is larger than that of the light outlet, and the size of the second light passing hole 4015 is the same as that of the light outlet of the first light passing hole 4013, that is, a section of cylindrical hole (the second light passing hole 4015) extends from the light outlet of the first light passing hole 4013 in the direction of the first optical filter 407. Can all be provided with the black glue film between the light-emitting port of second logical unthreaded hole 4015 and the light inlet of first logical unthreaded hole 4013, increase the coating scope on black glue film, so after some reverberation got into logical unthreaded hole, the black glue film can absorb this part reverberation, improved the absorption effect of reverberation, avoided the reverberation to get into laser 4031.

Considering the convenience of processing and technical factors, a black adhesive layer may be coated on all or a part of the inner wall of the second light through hole 4015, or a black adhesive layer may be coated on all or a part of the inner wall of the first light through hole 4013, as long as it can absorb the light beam reflected by the end face of the optical fiber ferrule 4061, and prevent the light beam from entering the light emitting device.

In order to further absorb the reflected light, a shielding plate can be arranged on the light-emitting surface of the second light-passing hole 4015, a light-passing hole 4014 is arranged on the shielding plate, and the light-passing hole 4014 is communicated with the second light-passing hole 4015, so that the size of a light outlet of the light-passing hole can be further reduced, and most of the reflected light is prevented from entering the light-passing hole.

In order to avoid the loss of the convergent light beam emitted from the light emitting device 403 in the light through hole, the central axis of the light through hole 4014 on the light emitting surface of the second light through hole 4015 coincides with the central axis of the second light through hole 4015, so that the convergent light beam can smoothly pass through the light through hole 4014.

In this example, a light passing hole is disposed between the first jack 4021 and the first optical filter 407, the size of the light outlet of the light passing hole is smaller than that of the light inlet, and the inner wall of the light passing hole is uniformly coated with a black glue layer. Thus, as shown in fig. 13, most of the light beams reflected by the end face of the optical fiber ferrule 4061 are transmitted to the outer wall of the light through hole, and even if some of the reflected light enters the light through hole, the reflected light is absorbed by the black glue layer on the inner wall of the light through hole, so that the reflected light is prevented from entering the laser 4031 through the light through hole, and the reflected light inside the tube body is reduced.

According to the technical scheme, the optical module comprises an optical transceiver component, the optical transceiver component comprises a tube body, an optical transmitter, an optical fiber adapter, an optical filter, an optical receiver and a black glue layer, one end, extending into the tube body, of the optical transmitter is provided with a lens, the optical transmitter is further obliquely provided with a laser, and the laser is subjected to eccentricity and inclination processing, so that an optical axis of light emitted by the laser forms an angle with a central axis of the lens, a transmission path of the emitted light is changed, and reflected light is prevented from entering the laser along an original optical signal transmission path; the optical fiber adapter is fixed at the other end of the tube body, an optical fiber inserting core is installed in the optical fiber adapter, and the optical axis of the optical fiber inserting core and the optical axis of light emitted by the laser are in an angle. The light emitted by the laser is converged and coupled to the optical fiber ferrule through the lens, and the light inlet shaft entering the optical fiber ferrule is not overlapped with the optical axis of the optical fiber ferrule, so that the reflected light is prevented from being transmitted along the original optical signal transmission path, and further the light cannot enter the laser along the optical axis emitted by the laser.

A light through hole is arranged between the light emitting device and the optical filter in the tube body, the size of a light outlet of the light through hole is smaller than that of a light inlet, a black glue layer is coated on the inner wall of the light through hole, light emitted by the laser is divergent light and converged at the lens, light spots of the convergent light beams are gradually changed into small light spots from large light spots, the light inlet of the light through hole can contain light beams of the large light spots to enter, and the small light spots are emitted from the light outlet; and the reflected light that produces in the optic fibre lock pin terminal surface department of fiber adapter appears the state of dispersing when propagating to logical unthreaded hole direction, and the facula is great, and the light-emitting opening that leads to the unthreaded hole and be located fiber adapter one end is less, and most of reflected light is blocked by the outer wall that leads to the unthreaded hole, and partial reflected light that gets into leads to the unthreaded hole is absorbed by the black glue layer for the reflected light can't get into the laser instrument through leading to the unthreaded hole, has avoided the reflected light to produce the influence to the laser instrument light-emitting.

Therefore, the optical module provided by the example can not generate loss on light emitted by the laser, can realize absorption of reflected light, and reduces the possibility that the reflected light in the optical module enters the laser again, thereby avoiding influencing the luminous performance of the laser and ensuring the coupling efficiency of the optical module.

It should be noted that, in the present specification, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a circuit structure, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such circuit structure, article, or apparatus. Without further limitation, the presence of an element identified by the phrase "comprising an … …" does not exclude the presence of other like elements in a circuit structure, article or device comprising the element.

Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.

The above-described embodiments of the present application do not limit the scope of the present application.

Claims (9)

1. A light module, comprising:

a circuit board;

the optical transceiving component is electrically connected with the circuit board and is used for transmitting and receiving optical signals;

wherein the optical transceiver component comprises:

the light-transmitting tube comprises a tube body, a first light-transmitting hole and a second light-transmitting hole, wherein the two opposite ends of the tube body are respectively provided with a first jack and a second jack, the third end of the tube body is provided with a third jack, a light-transmitting hole is arranged between the first jack and the second jack, and the light-transmitting hole is communicated with the first jack;

the light emitting device is inserted into the first jack, is electrically connected with the circuit board and is used for emitting a light signal, and the light signal penetrates through the light through hole;

the optical fiber adapter is inserted in the second jack, comprises an optical fiber inserting core positioned in the second jack and is used for receiving the optical signal transmitted by the light emitting device;

the optical filter is arranged between the first jack and the second jack and used for transmitting the optical signal emitted by the light emitting device and reflecting the optical signal from the optical fiber ferrule;

the light receiving device is inserted in the third jack, is electrically connected with the circuit board and is used for receiving the light signal reflected by the optical filter;

and the black glue layer is arranged on the inner wall of the light through hole and is used for absorbing the optical signal reflected by the end face of the optical fiber inserting core and emitted by the light emitting device.

2. The optical module according to claim 1, wherein an optical inlet is provided at an end of the light through hole close to the first jack, and the light through hole is communicated with the first jack through the optical inlet; one end of the light through hole, which is close to the optical filter, is provided with a light outlet, and the size of the light inlet is larger than that of the light outlet.

3. The optical module according to claim 2, wherein the black glue layer is disposed on an inner wall of the light through hole between the light outlet and the light inlet.

4. The optical module according to claim 1, wherein the end surface of the fiber stub is an inclined end surface, and the inclined end surface is inclined upward in a direction from the optical filter to the second insertion hole so that an incident optical path of the end surface of the fiber stub is different from a reflected optical path.

5. The optical module according to claim 1, wherein the light through holes comprise a first light through hole and a second light through hole which are communicated with each other, a light inlet is arranged at one end of the first light through hole close to a first jack, and the first light through hole is communicated with the first jack through the light inlet; a light outlet is formed in one end, close to the second light through hole, of the first light through hole, and the first light through hole is communicated with the second light through hole through the light outlet; the size of the light inlet of the first light through hole is larger than that of the light outlet, and the size of the second light through hole is the same as that of the light outlet of the first light through hole.

6. The optical module according to claim 5, wherein the black glue layer is disposed on all or a part of an inner wall of the second light passing hole.

7. The optical module according to claim 5, wherein the black glue layer is disposed on all or a part of an inner wall of the first light passing hole.

8. The optical module as claimed in claim 5, wherein a shielding plate is disposed on a light emitting surface of the second light passing hole, and a light passing hole is disposed on the shielding plate and is communicated with the second light passing hole.

9. The light module of claim 8, wherein a central axis of the light hole coincides with a central axis of the second light hole.

Images