CN215181032U

CN215181032U - Optical module

Info

Publication number: CN215181032U
Application number: CN202121396393.4U
Authority: CN
Inventors: 刘鹏飞; 张华妮; 杨冰; 蔚永军; 张晓廓; 慕建伟
Original assignee: Hisense Broadband Multimedia Technology Co Ltd
Current assignee: Hisense Broadband Multimedia Technology Co Ltd
Priority date: 2021-06-23
Filing date: 2021-06-23
Publication date: 2021-12-14
Anticipated expiration: 2031-06-23

Abstract

The application discloses optical module includes: a circuit board and a light receiving device electrically connected to each other, wherein the light receiving device includes: a tube holder; the pipe cap is covered above the pipe seat to form a sealed cavity; the light window is arranged at the top of the pipe cap and is obliquely arranged with the pipe seat; the optical wavelength division multiplexer is arranged on the inner wall of the optical window; the optical wavelength division multiplexer is provided with two light outlets, and the emergent signal light is vertical to the tube seat; the first light receiving chip and the second light receiving chip are arranged above the tube seat and used for receiving the signal light of the light outlet; the optical window and the tube seat are obliquely arranged, so that return loss of signal light is reduced. According TO the method, two optical receiving chips are integrated in the same TO tube shell, and light is split by using an optical wavelength division multiplexer, so that a multi-wavelength beam combination communication mode is realized, the bandwidth of a TO monomer is favorably expanded, and the application of higher speed can be supported; meanwhile, the single tube shell is adopted to realize packaging, the packaging cost is low, the installation is convenient, and the resources are saved.

Description

Optical module

Technical Field

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

Background

At present, an optical module is an important component of a modern optical communication network, and provides a physical channel for Gbit high-speed data for the communication network.

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. The current packaging form of the optical module mainly includes a TO (Transistor-out) package and a COB (Chip on Board) package.

The core devices of the optical module are two parts, namely a light emitting device and a light receiving device, which are respectively used for realizing the emission of optical signals and the reception of the optical signals. The light receiving device adopts coaxial TO encapsulation and comprises a TO tube seat and a TO tube cap covering the TO tube seat. The speed of the optical receiving device is improved, so that the communication speed of the optical module is improved.

SUMMERY OF THE UTILITY MODEL

The application provides an optical module to improve the communication rate of the optical module.

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

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

a circuit board;

a light receiving device electrically connected to the circuit board, comprising:

a tube holder;

the pipe cap is covered above the pipe seat to form a sealed cavity;

the optical window is arranged on the pipe cap and is obliquely arranged with the pipe seat, signal light enters the sealed cavity through the optical window, and the signal light is a beam of light with different wavelengths;

the optical wavelength division multiplexer is arranged on the lower surface of the optical window; the optical wavelength division multiplexer is provided with two light outlets and is used for splitting the signal light into two sub-signal lights with different wavelengths;

the first light receiving chip is arranged on the light outgoing path of the optical wavelength division multiplexer and used for receiving the sub-signal light of one light outgoing port;

and the second light receiving chip is arranged on the light outgoing path of the optical wavelength division multiplexer and is used for receiving the sub-signal light of the other light outgoing port.

Compared with the prior art, the beneficial effect of this application is:

the application discloses optical module includes: a circuit board and a light receiving device electrically connected to each other, wherein the light receiving device includes: a tube holder; the pipe cap is covered above the pipe seat to form a sealed cavity; the optical window is arranged at the top of the pipe cap, and signal light enters the sealed cavity through the optical window; the optical wavelength division multiplexer is arranged on the inner wall of the optical window; the optical wavelength division multiplexer is provided with two light outlets, and the emergent signal light is vertical to the tube seat; the first light receiving chip is arranged above the tube seat and used for receiving the signal light of one light outlet; the second light receiving chip is arranged above the tube seat and used for receiving the signal light of the other light outlet; the optical window and the tube seat are obliquely arranged, so that return loss of signal light is reduced. External signal light with different wavelengths enters the sealed cavity through the optical window, is decomposed into two different signal lights with single wavelength by the optical wavelength division multiplexer, and then respectively passes through different light receiving chips to generate corresponding electric signals. According TO the method, two optical receiving chips are integrated in the same TO tube shell, and light is split by using an optical wavelength division multiplexer, so that a multi-wavelength beam combination communication mode is realized, the bandwidth of a TO monomer is favorably expanded, and the application of higher speed can be supported; meanwhile, the single tube shell is adopted to realize packaging, the packaging cost is low, the installation is convenient, and the resources are saved.

On the other hand, the embodiment of the present application discloses an optical module, including: a circuit board;

a light emitting device electrically connected to the circuit board, comprising:

a tube holder;

the pipe cap is covered above the pipe seat to form a sealed cavity;

the first light emitting chip is arranged above the tube seat and used for emitting sub-signal light with a first wavelength;

the second light emitting chip is arranged above the tube seat and used for emitting sub-signal light with a second wavelength;

the optical wavelength division multiplexer comprises two light inlets which are respectively arranged on the emergent light paths of the first light emitting chip and the second light emitting chip; the optical wavelength division multiplexer is used for multiplexing the sub-signal light into a beam of signal light with different wavelengths;

and the optical window is arranged on the pipe cap and positioned on an emergent light path of the optical wavelength division multiplexer, the optical window and the pipe seat are obliquely arranged, and signal light is emitted out of the sealing cavity through the optical window.

Compared with the prior art, the beneficial effect of this application is:

the application discloses optical module includes: a circuit board and a light emitting device electrically connected to each other, wherein the light receiving device includes: a tube holder; the pipe cap is covered above the pipe seat to form a sealed cavity; the optical window is arranged at the top of the pipe cap, and signal light is emitted out of the sealed cavity through the optical window; the optical wavelength division multiplexer is arranged on the inner wall of the optical window; the optical wavelength division multiplexer is provided with two light inlets, and the emergent signal light is vertical to the tube seat; the first light emitting chip is arranged above the tube seat and used for emitting sub-signal light with a first wavelength; the second transmitting and receiving chip is arranged above the tube seat and used for transmitting the sub-signal light with the first wavelength; the optical window and the tube seat are obliquely arranged, so that return loss of signal light is reduced. The different light emission chips emit the sub-signal light into two sub-signal light beams with single wavelength, the two sub-signal light beams are multiplexed into one signal light beam with different wavelength by the optical wavelength division multiplexer, and the optical window is emitted out of the sealed cavity. According TO the method, two optical transmitting chips are integrated in the same TO tube shell, and the optical wavelength division multiplexer is used for beam combination, so that a multi-wavelength beam combination communication mode is realized, the bandwidth of a TO monomer is expanded, and the application of higher speed can be supported; meanwhile, the single tube shell is adopted to realize packaging, the packaging cost is low, the installation is convenient, and the resources are saved.

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 disclosure;

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

fig. 5 is a schematic structural diagram of a light receiving device according to an embodiment of the present application;

fig. 6 is a first schematic exploded view of a light receiving device according to an embodiment of the present disclosure;

fig. 7 is a schematic diagram illustrating an exploded structure of a light receiving device according to an embodiment of the present disclosure;

fig. 8 is a schematic partial structure diagram of a light receiving device according to an embodiment of the present disclosure;

fig. 9 is a schematic partial exploded view of a light receiving device according to an embodiment of the present disclosure;

fig. 10 is a schematic cross-sectional view of a light receiving device according to an embodiment of the present application;

fig. 11 is a schematic diagram of an optical wavelength division multiplexer according to an embodiment of the present application;

fig. 12 is a schematic diagram of optical signal paths in an optical receiver according to an embodiment of the present disclosure;

fig. 13 is a schematic partial structure diagram of a light receiving device according to an embodiment of the present application;

FIG. 14 is a schematic view of a portion of the structure of FIG. 13;

fig. 15 is a schematic partial exploded view of a light receiving device 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 first circuit board 105, and a cage 106 is disposed on a surface of the first 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 first circuit board, and the electrical connector on the first circuit board is wrapped in the cage, so that the electrical connector is arranged inside 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 diagram of an optical module structure provided in the embodiment of the present application, and fig. 4 is an exploded schematic diagram of an optical module provided in the embodiment of the present application. 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 component comprises an optical transmitter and an optical receiver, which are respectively used for transmitting optical signals and receiving optical signals. 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 optical transceiver module 400 further includes an adjusting ring disposed between the square tube and the optical fiber adapter, the adjusting ring is screwed to the square tube, and the distance between the optical transmitter and the optical fiber ferrule in the optical fiber adapter can be adjusted by the adjusting ring.

The optical transceiver comprises two parts, namely an optical transmitting part and an optical receiving part, which are respectively used for realizing the transmission of optical signals and the reception of the optical signals. The light emitting part and the light receiving part may be combined together or may be independent of each other. Since light is reversible, the implementation of light emitting devices is far from being substantially identical to light receiving devices, and the present application mainly takes a light receiving device as an example. Fig. 5 is a schematic structural diagram of a light receiving device according to an embodiment of the present application; fig. 6 is a first schematic exploded view of a light receiving device according to an embodiment of the present disclosure; fig. 7 is a schematic diagram of an exploded structure of a light receiving device according to an embodiment of the present application. Fig. 6 and 7 show the internal structure of the light receiving device from different angles.

As shown in fig. 5, 6, and 7, the light receiving device is packaged by using a coaxial TO package, and includes a tube seat 402 and a tube cap 401 covering the tube seat 402, wherein photoelectric devices such as a lens and a photodiode are disposed on a surface of the tube seat 402, an optical window for light TO pass through is disposed on the tube cap 401, and the tube seat 402 and the tube cap 401 package the photoelectric devices such as the lens and the photodiode in a sealed cavity. The pipe cap 401 is provided with an optical window 4011 to realize light transmission, ensure that external light enters the sealed cavity, and receive by the photosensitive diode to convert optical signals into electrical signals. The socket 402 has a plurality of pins 403, the pins 403 pass through the socket 402 and protrude from the surface of the socket 402, and the pins 403 are wrapped by glass or insulating glue to insulate the pins 403 from the socket 402. The optoelectronic device is sealed between the stem 402 and the cap 401, which establishes electrical connection with the outside through pins 403 passing through the stem 402. External light enters the sealed cavity through the optical window 4011, and after the photosensitive diode receives the light signal and converts the light signal into an electrical signal, the electrical signal is electrically connected with the outside through the pin 403.

In the embodiment of the present application, the light entering the optical window 4011 includes two optical signals with different wavelengths.

Fig. 8 is a schematic partial structure diagram of a light receiving device according to an embodiment of the present application, fig. 9 is a schematic partial exploded structure diagram of a light receiving device according to an embodiment of the present application, and fig. 10 is a schematic cross-sectional structure diagram of a light receiving device according to an embodiment of the present application. As shown in fig. 8, 9 and 10, multi-beam combining communication is implemented, and the communication rate of the optical module is improved, in this application, the optical receiver includes: the optical wavelength division multiplexer 404 is disposed at one side of the optical window 4011, and configured to split a different optical signal into two optical signals with a single wavelength. The first photodiode 4061 and the second photodiode 4062 are disposed on the surface of the stem 402, and are located on the light-emitting path of the optical wavelength division multiplexer 404, and are configured to receive the optical signal decomposed by the optical wavelength division multiplexer 404.

The top of the cap 401 has an opening, and an optical window is disposed at the opening for signal light to enter. Specifically, the light window is arranged at the bottom of the opening, and the upper surface of the light window is connected and sealed with the inner wall of the opening. The optical wavelength division multiplexer 404 is disposed on the lower surface of the optical window 4011, the optical window is disposed obliquely to the stem 402, and the external signal light is disposed perpendicular to the stem 402, so that a certain included angle exists between the external signal light and the normal of the optical window, and return loss of the signal light is reduced.

Fig. 11 is a schematic diagram of an operation of an optical wavelength division multiplexer according to an embodiment of the present application. Fig. 12 is a schematic diagram of optical signal paths in a light receiving device according to an embodiment of the present disclosure. As shown in fig. 8 to 12, the optical wavelength division multiplexer 404 includes an input port for inputting signal light with multiple wavelengths and a plurality of output ports for outputting light, each of the output ports being used for outputting signal light with one wavelength. In the embodiment of the present application, the number of the light outlets is 2. The optical wavelength division multiplexer 404 is close to optical window 4011 one end and sets up into the light mouth, and goes into light mouth one side inner wall and set up first filter, and first filter is close to the entering of optical window 4011 one side admission signal light, and the opposite side is to the light reflection. The first light outlet 4041 is provided with a second filter for filtering the signal light and allowing the signal light with a specific wavelength to exit. The second light outlet 4042 is provided with a third filter for filtering the signal light and allowing the signal light with another specific wavelength to exit.

Suppose that a beam of signal light with two wavelengths, λ 1 and λ 2, enters the optical wavelength division multiplexer 404 through the incident light port of the optical wavelength division multiplexer 404, where λ 1 signal light is reflected twice differently by the optical wavelength division multiplexer 404 and reaches its light exit port, λ 2 signal light is incident to the optical wavelength division multiplexer 404 and then is directly transmitted to its light exit port, and thus signal light with different wavelengths enters the optical wavelength division multiplexer 404 through the same light entrance port and is output through different light exit ports.

Further, to realize the wavelength division function of the optical wavelength division multiplexer 404, the light inlet of the optical wavelength division multiplexer 404 is not perpendicular to the signal light, that is, the normal line of the light inlet has a certain included angle with the signal light, so as to realize the continuous reflection of the signal light inside the optical wavelength division multiplexer 404. Specifically, in some embodiments provided herein, the optical window 4011 is disposed obliquely to the surface of the stem 402, and the optical wavelength division multiplexer 404 is bonded to the inner surface of the optical window 4011 by an optical adhesive. The inclination angle of the optical window 4011 is the same as the inclination angle of the optical wavelength division multiplexer 404.

As shown in fig. 8 to fig. 11, the light receiving device according to the embodiment further includes: and a lens group disposed between the optical wavelength division multiplexer 404 and the photodiode, for converging the signal light emitted from the optical wavelength division multiplexer 404 to the photodiode. Including a first converging lens 4051 and a second converging lens 4052. The first focusing lens 4051 is disposed between the first light outlet 4041 and the first photodiode 4061, the λ 1 signal light is reflected twice by the optical wavelength division multiplexer 404 to reach the first light outlet 4041, and then is focused by the first focusing lens 4051 to the first photodiode 4061, and the first photodiode 4061 converts the λ 1 signal light into an electrical signal. The second converging lens 4052 is disposed between the second light outlet 4042 and the second photodiode 4062, the λ 2 signal light directly reaches the second light outlet 4042 through the optical wavelength division multiplexer 404, and then converges to the second photodiode 4062 through the second converging lens 4052, and the second photodiode 4062 converts the λ 2 signal light into an electrical signal.

Therefore, the first focusing lens 4051 is covered above the first photodiode 4061, and the second focusing lens 4052 is covered above the second photodiode 4062, so that the first focusing lens 4051 and the second focusing lens 4052 can be mounted in an integral support structure, and the two ends of the support are mounted on two sides of the photodiode; it is also possible to provide a configuration as shown in the drawing in which a first support and a second support are provided below the first focusing lens 4051 for raising the first focusing lens 4051 so that the first focusing lens 4051 covers above the first photodiode 4061. Wherein, first support sets up in one side of first photodiode 4061, the second support sets up in the opposite side of first photodiode 4061, the one end and the first support of the bottom surface of first convergent lens 4051 are connected, the other end and the second support of bottom surface are connected, the upper surface of first support and second support is higher than the photosurface of first photodiode 4061, lambda 1 signal light incides to the photosurface of first photodiode 4061 after the convergence of first convergent lens 4051, first photodiode 4061 is to converting lambda 1 signal light into the signal of telecommunication.

Third and fourth standoffs are provided below the second focusing lens 4052 for raising the second focusing lens 4052 such that the second focusing lens 4052 is shrouded above the second photodiode 4062. The third support is arranged on one side of the second photodiode 4062, the fourth support is arranged on the other side of the second photodiode 4062, one end of the bottom surface of the second focusing lens 4052 is connected with the third support, the other end of the bottom surface is connected with the fourth support, the upper surfaces of the third support and the fourth support are higher than the photosensitive surface of the second photodiode 4062, the lambda 2 signal light is incident to the photosensitive surface of the second photodiode 4062 after being focused by the second focusing lens 4052, and the second photodiode 4062 converts the lambda 2 signal light into an electrical signal.

Further, for the convenience of installation, the first focusing lens 4051 and the second focusing lens 4052 may use the same holder, and the specific arrangement may be changed according to the inner space of the cavity and the position of other photoelectric devices, which is not specifically set herein.

The embodiment of the application integrates two photosensitive diodes in the same TO, and the light splitting scheme of the optical wavelength division multiplexer 404 is used, so that the multi-wavelength beam combination communication mode is realized, the expansion of the bandwidth of the TO monomer is facilitated, and the application of higher speed can be supported. Meanwhile, the single tube shell is adopted to realize packaging, the packaging cost is low, and the resources are saved.

Further, in the embodiment of the present application, in order to prevent the light-sensitive surface of the photodiode from reflecting the optical signal and entering the optical wavelength division multiplexer 404, the first photodiode 4061 and the second photodiode 4062 are disposed obliquely. Specifically, the light receiving device includes: the carrier 409 is disposed on the surface of the stem 402 and carries the first photodiode 4061 and the second photodiode 4062. Wherein the photosensitive surfaces of the first photodiode 4061 and the second photodiode 4062 are oppositely inclined. The platform 409 may be integrally formed with the tube base 402 or may be a separate component.

Fig. 13 is a schematic partial structure diagram of a light receiving device according to an embodiment of the present application; FIG. 14 is a schematic view of a portion of the structure of FIG. 13; fig. 15 is a schematic partial exploded view of a light receiving device according to an embodiment of the present application. Referring to fig. 13 and 14, the platform 409 has a first inclined surface 4091, and the first inclined surface 4091 is inclined to the tube seat 402 at a certain angle. One end of the first inclined surface 4091 protrudes relative to the stem 402 to form an inclined surface; the other end is connected to a stem 402. Generally, the angle between the first inclined surface 4091 and the stem 402 is related to the type of the first photodiode 4061, and the angle between the first inclined surface 4091 and the stem 402 is the angle between the normal of the light-sensitive surface of the first photodiode 4061 and the incident light signal. An included angle is formed between the normal line of the photosensitive surface of the first photodiode 4061 and an incident light signal, and a signal of the light signal reflected by the photosensitive surface of the first photodiode 4061 is inconsistent with a new path of the original incident light signal, so that return loss is improved.

The bearing platform 409 is provided with a second inclined surface 4092, and the second inclined surface 4092 and the pipe seat 402 are obliquely arranged at a certain included angle. One end of the second inclined surface 4092 protrudes relative to the stem 402 to form an inclined surface; the other end is connected to a stem 402. The angle between the second inclined surface 4092 and the stem 402 is typically related to the type of the second photodiode 4062, and the angle between the second inclined surface 4092 and the stem 402 is the angle between the normal of the light sensitive surface of the second photodiode 4062 and the incident light signal. An included angle is formed between the normal line of the photosensitive surface of the second photodiode 4062 and the incident light signal, and the reflected signal of the light signal on the photosensitive surface of the second photodiode 4062 is inconsistent with the original incident light signal in a new path, which is beneficial to improving return loss.

And the inclination angle of the second inclined surface 4092 is opposite to that of the first inclined surface 4091, the connection position of the convex end of the second inclined surface 4092 and the convex end of the first inclined surface 4091 is a triangular structure, the bearing platform 409 is an obtuse angle, the included angle between the second inclined surface 4092 and the first inclined surface 4091 avoids crosstalk between two optical signal channels, the optical signal reflected by the first photodiode 4061 is far away from the second photodiode 4062, and the optical signal reflected by the second photodiode 4062 is far away from the first photodiode 4061. The light reflected by the first photodiode 4061 and the second photodiode 4062 does not affect the incident light signal, and the return loss and the crosstalk between channels are improved.

The first photodiode 4061 and the second photodiode 4062 are tilted in opposite directions to avoid cross-talk of signals between channels.

In order to electrically connect the first photodiode 4061 to the outside, the light receiving device provided in the embodiment of the present application further includes: the first transimpedance amplifier and the first matching capacitor, one electrode of the first photodiode 4061 is connected with the first transimpedance amplifier 4071 through a gold wire, and the transimpedance amplifier 4071 is connected with the pin through a gold wire. The other electrode of the first photodiode 4061 is connected to a first matching capacitor 4081 by gold wire, and the first matching capacitor 4081 is further connected to the pin by gold wire. The same external electrical connection manner of the second photodiode 4062 is the same as the external electrical connection manner of the second photodiode 4062, and therefore, the description thereof is omitted.

An embodiment of the present application provides an optical module, including: a circuit board and a light receiving device electrically connected to each other, wherein the light receiving device includes: a tube holder; the pipe cap is covered above the pipe seat to form a sealed cavity; the optical window is arranged at the top of the pipe cap and is obliquely arranged with the pipe seat, and signal light enters the sealed cavity through the optical window; the optical wavelength division multiplexer is arranged on the inner wall of the optical window; the optical wavelength division multiplexer is provided with two light outlets, and the emergent signal light is vertical to the tube seat; the first photosensitive diode is arranged above the tube seat and used for receiving the signal light of the light outlet; the second photosensitive diode is arranged above the tube seat and used for receiving the signal light of the other light outlet; wherein the light window has the same tilt angle as the optical wavelength division multiplexer. External signal light with different wavelengths enters the sealed cavity through the optical window, is decomposed into two different signal lights with single wavelength by the optical wavelength division multiplexer, and then respectively passes through different photodiodes to generate corresponding electrical signals. According TO the method, two photosensitive diodes are integrated in the same TO tube shell, and light is split by using an optical wavelength division multiplexer, so that a multi-wavelength beam combination communication mode is realized, the bandwidth of a TO monomer is favorably expanded, and the application of higher speed can be supported; meanwhile, the single tube shell is adopted to realize packaging, the packaging cost is low, the installation is convenient, and the resources are saved.

The application also discloses an optical module, includes: a circuit board and a light emitting device electrically connected to each other, wherein the light receiving device includes: a tube holder; the pipe cap is covered above the pipe seat to form a sealed cavity; the optical window is arranged at the top of the pipe cap, and signal light is emitted out of the sealed cavity through the optical window; the optical wavelength division multiplexer is arranged on the inner wall of the optical window; the optical wavelength division multiplexer is provided with two light inlets, and the emergent signal light is vertical to the tube seat; the first light emitting chip is arranged above the tube seat and used for emitting sub-signal light with a first wavelength; the second transmitting and receiving chip is arranged above the tube seat and used for transmitting the sub-signal light with the first wavelength; the optical window and the tube seat are obliquely arranged, so that return loss of signal light is reduced. The different light emission chips emit the sub-signal light into two sub-signal light beams with single wavelength, the two sub-signal light beams are multiplexed into one signal light beam with different wavelength by the optical wavelength division multiplexer, and the optical window is emitted out of the sealed cavity. According TO the method, two optical transmitting chips are integrated in the same TO tube shell, and the optical wavelength division multiplexer is used for beam combination, so that a multi-wavelength beam combination communication mode is realized, the bandwidth of a TO monomer is expanded, and the application of higher speed can be supported; meanwhile, the single tube shell is adopted to realize packaging, the packaging cost is low, the installation is convenient, and the resources are saved.

Since the above embodiments are all described by referring to and combining with other embodiments, the same portions are provided between different embodiments, and the same and similar portions between the various embodiments in this specification may be referred to each other. And will not be described in detail herein.

It is noted that, in this specification, relational terms such as "first" and "second," and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, 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 present disclosure. 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

1. A light module, comprising: a circuit board;

a tube holder;

the pipe cap is covered above the pipe seat to form a sealed cavity;

2. The optical module of claim 1, wherein the light outlet is disposed perpendicular to the stem; the photosensitive surface of the first light receiving chip is arranged obliquely to the tube seat, the photosensitive surface of the second light receiving chip is arranged obliquely to the tube seat, and the inclination directions of the first light receiving chip and the second light receiving chip are different.

3. The light module according to claim 1, wherein the light receiving device further comprises: the bearing platform protrudes out of the surface of the tube seat;

the plummer includes:

a first inclined surface inclined from the stem and having a surface bearing the first light receiving chip;

a second inclined surface inclined from the stem and having a surface bearing the first light receiving chip;

the included angle between the first inclined surface and the second inclined surface is protruded out of the tube seat; the included angle between the first inclined plane and the tube seat is opposite to the included angle between the second inclined plane and the tube seat in direction.

4. The light module according to claim 1, wherein the light receiving device further comprises: the first convergent lens is covered above the first light receiving chip;

the second convergent lens is covered above the second light receiving chip;

the first convergent lens is covered above the first convergent lens through a support type structure; the second convergent lens is covered above the second convergent lens through a support structure.

5. The light module according to claim 1, wherein the light receiving device further comprises: and one end of the pin is electrically connected with the circuit board, and the other end of the pin penetrates through the tube seat and protrudes out of the tube seat.

6. The light module according to claim 5, wherein the light receiving device further comprises: and one end of the first transimpedance amplifier is electrically connected with the first light receiving chip, and the other end of the first transimpedance amplifier is electrically connected with the pin.

7. The light module according to claim 6, wherein the light receiving device further comprises: and the first matching capacitor is electrically connected with the first light receiving chip.

8. The optical module according to claim 7, wherein the first transimpedance amplifier and the first light-receiving chip are electrically connected by a gold wire; the first matching capacitor is electrically connected with the first light receiving chip through a gold wire.

9. A light module, comprising: a circuit board;

a tube holder;

the pipe cap is covered above the pipe seat to form a sealed cavity;

10. The optical module of claim 9, wherein the light inlet is disposed perpendicular to the stem; emergent light of the first light emitting chip and emergent light of the second light emitting chip are arranged obliquely to the tube seat, and the first light receiving chip and the second light receiving chip are different in oblique direction.