WO2020253339A1

WO2020253339A1 - Optical module

Info

Publication number: WO2020253339A1
Application number: PCT/CN2020/084675
Authority: WO
Inventors: 蔚永军; 慕建伟
Original assignee: 青岛海信宽带多媒体技术有限公司
Priority date: 2019-06-19
Filing date: 2020-04-14
Publication date: 2020-12-24
Also published as: CN210605092U

Abstract

An optical module (200). The optical module (200) is provided with a tunable filter (420). The tunable filter (420) comprises a temperature regulator (423), a tunable light filter (424), and a first pin (422). A circuit board (300) achieves temperature control of the temperature regulator (423) by means of the first pin (422). Since the tunable light filter (424) is disposed on an upper surface of the temperature regulator (423), a change in the temperature of the temperature regulator (423) leads to a corresponding change in the temperature of the tunable light filter (424), thereby achieving temperature control of the tunable light filter (424). Since the operating wavelength and the temperature of the tunable light filter (424) usually have a linear relationship within a specific temperature range, controlling the temperature of the tunable light filter (424) enables an optical signal of a specific wavelength to propogate and other optical signals to be cut off. The optical module (200) achieves dynamic selection of a received signal wavelength, and improves the utilization rate of optical network resources.

Description

Optical module

This application claims the priority of a Chinese patent application filed with the Chinese Patent Office on June 19, 2019, with application number 201920923014.9 and invention title "a kind of optical module", the entire content of which is incorporated into this application by reference.

Technical field

This application relates to the field of optical communication technology, and in particular to an optical module.

Background technique

The optical module (ONT, optical network terminal, optical module) realizes the function of photoelectric conversion in the field of optical fiber communication technology. The intensity of the optical signal input from the optical module to the external optical fiber directly affects the quality of optical fiber communication. PON (Passive Optical Network) has the advantages of high bandwidth, high efficiency, and large coverage, and is widely used in optical modules.

The traditional PON system is a point-to-multipoint network system based on the Time Division Multiplexing (TDM) mechanism. Generally, the PON system includes an optical line terminal (OLT) on the office side and an OLT on the user side. Multiple optical network units (Optical Network Unit, ONU) and an optical distribution network (Optical Distributing Network, ODN) connected between the OLT and the ONU. Wherein, the ODN is used to distribute or multiplex the data signal between the OLT and the ONU, so that multiple ONUs can share the optical transmission channel.

In the above-mentioned PON system based on the TDM mechanism, the direction from the OLT to the ONU is called downstream. The OLT broadcasts the downstream data stream to all ONUs in TDM mode, and each ONU only receives data with its own identification; from ONU to OLT The direction is upstream. Since each ONU shares the optical transmission channel, in order to ensure that the upstream data of each ONU does not conflict, the PON system adopts Time Division Multiple Access (TDMA) in the upstream direction, that is, the OLT allocates each ONU Time slot, each ONU sends upstream data strictly according to the time slot allocated by the OLT.

However, the above-mentioned PON system is affected by the time-division characteristics of the TDM mechanism, and the user's available bandwidth is usually limited, and on the other hand, the available bandwidth of the optical fiber itself cannot be effectively utilized, so it cannot meet the needs of emerging broadband network application services. In order to solve the above problems and consider compatibility with existing PON systems, the industry has proposed a hybrid PON system (hereinafter referred to as TWDM-PON) that integrates Wavelength Division Multiplexing (WDM) technology and TDM technology. In hybrid PON, Multiple wavelength channels are used for data transmission and reception between the central office OLT and the user-side ONU, that is, the hybrid PON system is a multi-wavelength PON system.

TWDM-PON technology provides four or more wavelengths on each optical fiber, with a wavelength spacing of 100GHz or 50GHz (0.8nm or 0.4nm), and each wavelength can provide 2.5Gbps or 10Gbps symmetrical or asymmetrical transmission capacity, which The receiver of the ONT is required to be able to coordinate to the correct uplink and downlink optical channels when users use services, and have sufficient isolation to other optical channels.

At present, the passband of the ONT receiving thin-film filter in the optical fiber transmission equipment is at least 20 nm and is not tunable. This completely fails to meet the TWDM-PON ONT's narrow receiving wavelength bandwidth and tunable optical channel requirements.

Summary of the invention

Based on the above technical problems, the purpose of this application is to provide an optical module. To solve the technical problems existing in the prior art.

The embodiment of the present application shows an optical module, including: a round tube body, one end of which is provided with a light emitting sub-module, the other end of which is provided with an optical fiber adapter, and the top of which is provided with a groove;

The adjustable filter is arranged in the groove;

The light receiving sub-module is arranged on the upper part of the groove;

The tunable filter includes:

A housing, the upper and lower surfaces of which are respectively provided with a first window and a second window;

The temperature regulator is arranged on the lower surface of the housing, and the upper and lower surfaces thereof have light-transmitting through holes; the first window, the light-transmitting through hole, and the second window are aligned with each other to facilitate light transmission ；

The tunable filter is arranged at the light-transmitting hole on the upper surface of the temperature regulator;

One end of the first pin extends into the housing through the side wall of the housing and is electrically connected to the temperature regulator; the other end is electrically connected to the circuit board. .

Description of the drawings

In order to explain the technical solution of the present application more clearly, the following will briefly introduce the drawings needed in the embodiments. Obviously, for those of ordinary skill in the art, without paying creative labor, Other drawings can be obtained from these drawings.

Figure 1 is a schematic diagram of the connection relationship of an optical communication terminal;

Figure 2 is a schematic diagram of the structure of an optical network unit;

FIG. 3 is a schematic structural diagram of an optical module provided by an embodiment of the application;

4 is a schematic diagram of an exploded structure of an optical module provided by an embodiment of the application;

FIG. 5 is a schematic diagram of the connection relationship of various components of a tunable optical transceiver device according to an embodiment of the application;

FIG. 6 is a schematic structural diagram of a tunable optical transceiver device provided by an embodiment of the application;

FIG. 7 is a schematic diagram of an exploded structure of a tunable optical transceiver device according to an embodiment of the application;

Figure 8 is a cross-sectional view of a rectangular tube provided by an embodiment of the application;

Figure 9 is a top view of a rectangular tube provided by an embodiment of the application;

FIG. 10 is a schematic structural diagram of a tunable filter provided by an embodiment of the application;

11 is a schematic diagram of an exploded structure of a tunable filter provided by an embodiment of the application;

12 is a cross-sectional view of a tunable filter provided by an embodiment of the application;

FIG. 13 is a top cross-sectional view of a tunable filter provided by an embodiment of the application;

Figure 14 is a cross-sectional view of a connector provided by an embodiment of the application;

15 is a cross-sectional view of a light receiving sub-module provided by an embodiment of the application;

16 is a cross-sectional view of an optical fiber adapter provided by an embodiment of the application;

FIG. 17 is a cross-sectional view of a light emitting sub-module provided by an embodiment of the application.

Detailed ways

The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of this application.

One of the core links of optical fiber communication is the conversion of photoelectric signals. Optical fiber communication uses information-carrying optical signals to be transmitted in optical fibers/optical waveguides, and the passive transmission characteristics of light in optical fibers can realize low-cost and low-loss information transmission. However, information processing equipment such as computers uses electrical signals, which requires mutual conversion between electrical signals and optical signals during the signal transmission process.

The optical module implements the above-mentioned photoelectric conversion function in the field of optical fiber communication technology, and the mutual conversion of optical signals and electrical signals is the core function of the optical module. The optical module realizes the electrical connection with the external host computer through the gold finger on the circuit board. The main electrical connections include power supply, I2C signal, data signal transmission, and grounding. The electrical connection method realized by the gold finger has become the optical module industry. The standard method, based on this, the circuit board is an essential technical feature in most optical modules.

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

One end of the optical fiber is connected to the remote server, and one end of the network cable is connected to the local information processing equipment. The connection between the local information processing equipment and the remote server is completed by the connection of the optical fiber and the network cable; and the connection between the optical fiber and the network cable is performed by the optical network with optical modules The unit is complete.

The optical port of the optical module 200 is connected to the optical fiber 101 to establish a bidirectional optical signal connection with the optical fiber; the electrical port of the optical module 200 is connected to the optical network unit 100 to establish a bidirectional electrical signal connection with the optical network unit; the optical module implements optical signals And electrical signals, so as to establish a connection between the optical fiber and the optical network unit; specifically, the optical signal from the optical fiber is converted into an electrical signal by the optical module and then input to the optical network unit 100. The electrical signal is converted into an optical signal by the optical module and input into the optical fiber. The optical module 200 is a tool for realizing the mutual conversion of photoelectric signals and does not have the function of processing data. During the above photoelectric conversion process, the information has not changed.

The optical network unit has an optical module interface 102, which is used to connect to the optical module and establish a two-way electrical signal connection with the optical module; the optical network unit has a network cable interface 104, which is used to connect to a network cable and establish a two-way electrical signal connection with the network cable; The connection between the module and the network cable is established through the optical network unit. Specifically, the optical network unit transmits the signal from the optical module to the network cable, and transmits the signal from the network cable to the optical module. The optical network unit acts as the upper computer of the optical module to monitor the optical module. work.

So far, the remote server establishes a two-way signal transmission channel with the local information processing equipment through optical fibers, optical modules, optical network units and network cables.

Common information processing equipment includes routers, switches, electronic computers, etc.; the optical network unit is the upper computer of the optical module, which provides data signals to the optical module and receives data signals from the optical module. The common optical module upper computer also has optical lines Terminal etc.

Figure 2 is a schematic diagram of the optical network unit structure. As shown in Figure 2, there is a circuit board 105 in the optical network unit 100, and a cage 106 is provided on the surface of the circuit board 105; an electrical connector is provided in the cage 106 for accessing optical module electrical ports such as golden fingers; A radiator 107 is provided on the cage 106, and the radiator 107 has a convex structure such as fins to increase the heat dissipation area.

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

The cage 106 is located on the circuit board and wraps the electrical connectors on the circuit board in the cage; the optical module is inserted into the cage, and the optical module is fixed by the cage. The heat generated by the optical module is conducted to the cage through the optical module housing, and finally passes through the cage. The radiator 107 is diffused.

Optical modules play a key role in photoelectric conversion in the above-mentioned optical communication connections. At present, a silicon-based optoelectronic chip packaging method has gradually matured in the optical module industry. It combines silicon-based integrated circuit technology with optical waveguide technology, and uses chip The growth process produces a chip with integrated photoelectric conversion function and electro-optical conversion function. However, since the silicon material used in the silicon optical chip is not an ideal luminescent material for the laser chip, and the light-emitting unit cannot be integrated in the silicon optical chip manufacturing process, the silicon optical chip needs to be provided with light from an external light source.

FIG. 3 is a schematic structural diagram of an optical module provided by an embodiment of this application, and FIG. 4 is a schematic diagram of an exploded structure of an optical module provided by an embodiment of this application. As shown in Figure 3 and Figure 4, the optical module 200 provided by the embodiment of the present application includes an upper housing 201, a lower housing 202, an unlocking handle 203, a circuit board 300, and a dimmable transceiver 400;

The upper shell 201 and the lower shell 202 form a wrapping cavity with two openings, which can be opened at both ends (204, 205) in the same direction, or at two openings in different directions; one of the openings It is the electrical port 204, which is used to insert into the upper computer such as the optical network unit, and the other opening is the optical port 205, which is used for external optical fiber access to connect the internal optical fiber, the circuit board 300, the adjustable optical transceiver device 400; and the laser box 500 The optoelectronic device is located in the package cavity.

The upper shell and the lower shell are generally made of metal materials, which is conducive to electromagnetic shielding and heat dissipation; the assembly method of the upper shell and the lower shell is used to facilitate the installation of circuit boards and other components into the shell. Generally, the optical module will not be installed. The shell is made into an integral structure, so that when assembling circuit boards and other devices, positioning components, heat dissipation and electromagnetic shielding structures cannot be installed, and it is not conducive to production automation.

The unlocking handle 203 is located on the outer wall of the wrapping cavity/lower housing 202. Pulling the end of the unlocking handle can make the unlocking handle move relative to the outer wall surface; when the optical module is inserted into the upper computer, the unlocking handle fixes the optical module in the cage of the upper computer , Pull the unlocking handle to release the engagement relationship between the optical module and the host computer, so that the optical module can be withdrawn from the cage of the host computer.

Please refer to Figure 5-Figure 7. Wherein, FIG. 5 is a schematic diagram of the connection relationship of various components of an embodiment of the adjustable light transceiver 400 provided by the present application; FIG. 6 is a structural intention of the adjustable light transceiver shown in FIG. 5. FIG. 7 is an exploded schematic diagram of the structure of the adjustable optical transceiver shown in FIG. 5. The adjustable optical transceiver 400 includes: a rectangular tube body 410, an adjustable filter 420, a connector 430, a light receiving sub-module 440, an optical fiber adapter 450, and a light transmitting sub-module 460. Among them, the tunable filter 420, the connecting piece 430, the light receiving sub-module 440, the optical fiber adapter 450 and the light transmitting sub-module 460 are connected by a square tube body 410. Refer to Figure 5 for the specific connection relationship. The structural relationship among the light transmitting sub-module 460, the tunable filter 420, the light receiving sub-module 440, the optical fiber adapter 450 and the square tube 410 will be described in detail below.

For the structure of the circular square tube body 410, please refer to FIG. 8. The circular square tube body 410 shown in the present application may include: a first side wall, a second side wall adjacent to the first side wall, a third side wall opposite to the first side wall, and a third side wall opposite to the second side wall. The fourth side wall. Wherein, the first side wall, the second side wall, the third side wall and the fourth side wall are connected end to end to form a square seat. The first side wall, the second side wall and the third side wall respectively have light transmission windows, which are collectively referred to as the first light transmission window 411, the second light transmission window 412, and the third light transmission window 413 hereinafter.

The inside of the circular square tube 410 may be provided with a Wavelength Division Multiplexing (WDM) filter in some embodiments of the present application, which may be arranged at the center of the circular square tube 410 at an inclination angle of about 45 degrees. Position and opposite to the first light transmission window 411, the second light transmission window 412 and the third light transmission window 413 of the circular square tube body 410. On the one hand, the WDM filter 414 can transmit the optical signal transmitted through the optical emission sub-module 460 and enter the first optical transmission window 411 through the third optical transmission window 413, so as to transmit the optical signal outward through the optical fiber; on the other hand, WDM The filter 414 can also reflect the optical signal output from the optical fiber installed in the optical fiber adapter 450 and enter the circular square tube body 410 from the first optical transmission window 411, and reflect the optical signal to the second optical transmission window 412 to be received by the submodule. 440 received.

Please continue to refer to FIG. 8, the second side wall of the circular square tube 410 (and the top of the circular square tube 410) is provided with a groove 415 for placing the adjustable filter 420. The tunable filter 420 is disposed in the groove 415. In some embodiments of the present application, please refer to FIG. 9, the top of the circular square tube further includes a gap 418 that avoids the first pin 422 of the adjustable filter 420; the gap 418 penetrates the fifth of the circular square tube 410 The side wall (not shown in the figure) communicates with the housing cavity. In a feasible embodiment, the structure of the tunable filter 420 can be referred to FIGS. 10-13, where FIG. 10 is a schematic structural diagram of an embodiment of the tunable filter 420 provided in this application; FIG. 11 is FIG. 10 The schematic diagram of the decomposition structure of the dimming filter shown. 12 is a cross-sectional view of the dimming filter shown in FIG. 10; FIG. 13 is a cross-sectional view of the dimming filter shown in FIG. The tunable filter 420 may include: a housing 421, a first pin 422, a temperature regulator 423, a tunable filter 424, and a temperature monitor 425. The temperature regulator 423, the tunable filter 424, and the temperature monitor 425 may be packaged inside the housing 421, and the first pin 422 penetrates the side wall of the housing 421.

The shell 421 may be a cylindrical shell. Alternatively, the housing 421 may also be a cuboid or other shaped shell. In a specific example, the housing 421 may be integrally formed, or the housing 421 may be configured as the second receiving cavity 421a and the sealing cover 421b. In the embodiment shown in FIG. 12, the housing 421 includes a second receiving cavity 421a and a sealing cover 421b. The bottom surface of the second receiving cavity 421a is provided with a first window 421a, and the sealing cover 421b is provided with a second window 421b1. The side wall of the housing 421 may be provided with a plurality of through holes 421 c for receiving and fixing the first pins 422 respectively.

One end of the first pin 422 extends through the through hole 421c of the housing 421 and is electrically connected to the temperature regulator 423 and the temperature monitor 425; one end of the first pin 422 is electrically connected to the circuit board. The first pin 422 can be used to provide power to the temperature regulator 423 and the temperature monitor 425. In a specific embodiment, if the housing 421 is made of a metal material, in order to achieve electrical isolation between the first pin 422 and the housing 421 and each first pin 422, the inside of the through hole 421c may be filled with insulating material. For example, a glass filler may be provided between the housing 421 and the first pin 422. In specific implementation, the number of the first pins 422 can be determined according to needs.

In a specific embodiment, the temperature regulator 423 may be adhered to the first inner surface of the housing 421 through a thermally conductive silver paste to ensure that the temperature regulator 423 can exchange heat through the housing 421 to achieve a temperature adjustment effect. In order to enable the optical signal to pass through the temperature regulator 423 to the tunable filter 424, the temperature regulator 423 is provided with a light-transmitting hole 423c according to device requirements, and the center of the light-transmitting hole 423c extends outward to form a light-transmitting area . Correspondingly, a first window 421a1 is provided in the area of the second receiving cavity 421a corresponding to the light-transmitting area, and is provided on the other inner surface (ie, the second inner surface or the sealing cover 421b) opposite to the first inner surface There is a second window 421b1. The first window 421a1 and the second window 421b1 can be used as a light entrance window and a light exit window, respectively, and both can be embedded with light-transmitting materials, such as glass materials or other materials with low light insertion loss and high temperature resistance.

The tunable filter 424 can be adhered to the center of the other surface of the temperature regulator 423 through a thermally conductive silver paste. Among them, the temperature regulator 423 plays a role of supporting and fixing the tunable filter 424. The tunable filter 424 can be circular, rectangular or other shapes, and at least partially cover the light-transmitting hole 423c, and is aligned with the first window 421a1, the light-transmitting hole 423c, and the second window 421b1 to facilitate light transmission. . To ensure that the optical signal incident from the first window 421a1 and passing through the light-transmitting through hole 423c can pass through the tunable filter 424. In a specific embodiment, the tunable filter 424 may be a temperature-tunable optical filter device, such as a tunable thin-film optical filter device. In a specific temperature range, the channel wavelength of the tunable filter 424 corresponds to the temperature. . In other alternative embodiments, the tunable filter 424 may also adopt other types of tunable filter components, such as a liquid crystal tunable filter, a distributed Bragg reflective (Distributed Bragg Reflective, DBR) tunable filter, or a fiber Bragg grating. (Fiber Bragg Grating, FBG) tunable filters, acousto-optic tunable filters, tunable filters based on Micro Electro Mechanical Systems (MEMS), etc. In the technical solution shown in the embodiment of the present application, the temperature regulator 423 may be a heater or a thermoelectric cooler (TEC), and the temperature regulator 423 is used to adjust according to wavelength needs through temperature control methods such as heating or cooling. The channel wavelength of the tunable filter 424.

Taking the thermoelectric cooler 423 as an example, in one embodiment, a surface of the thermoelectric cooler 423 is adhered to the first inner surface of the housing 421 through a thermally conductive silver paste, and the tunable filter 424 is also thermally conductive. The silver paste is adhered to the other surface of the thermoelectric cooler 423, which can ensure that the thermoelectric cooler directly transfers heat to the tunable filter 424 through the conductive silver paste, or absorbs heat directly from the tunable filter 424 , To ensure a more efficient heat exchange between the temperature regulator 423 and the tunable filter 424.

In a specific embodiment, the temperature regulator 423 includes contacts. Take the tunable filter 420 shown in FIG. 13 as an example. In the embodiment shown in FIG. 13, the temperature regulator 423 includes: a first contact 423a, a second contact 423b, the first contact 423a and the second contact 423b are arranged on the side adjacent to the first pin 422 wall. In the embodiment shown in FIG. 13, the first pin 422 includes: a first pin 422a, a second pin 422b, a third pin 422c, and a fourth pin 422d; the first contact 423a is connected to The first pin 422a of the tunable filter 420 is connected, and the second contact 423b is connected to the fourth pin 422d of the tunable filter 420 through a metal wire. The first contact 423a and the second contact 423b are respectively used to receive power signals from the first pin 422a and the fourth pin 422b to drive the temperature regulator 423 to heat or cool the adjustable filter 420.

In the embodiment shown in FIG. 13, the tunable filter 420 further includes a temperature monitor 425. The temperature monitor 425 is adhered to the surface of the temperature regulator 423 through a thermally conductive silver paste and is located close to the tunable filter 424. The temperature monitor 425 is used to monitor the temperature of the tunable filter 424 or the thermistor of the tunable filter 424 or the thermistor of other temperature-sensitive devices. The temperature monitor 425 is located close to the tunable filter 424. In this way, the temperature monitor 425 can more accurately reflect the working temperature of the tunable filter 424, thereby achieving precise filtering. In the solution shown in FIG. 13, the temperature monitor 425 can be connected to the third pin 422 through a metal wire on the one hand to receive a power signal from the third pin 422 for temperature and resistance detection; on the other hand, temperature monitoring The temperature regulator 425 may be connected to the contact of the temperature regulator 423 to control the temperature regulator 423 to adjust or lock the wavelength of the tunable filter 424 according to the detected temperature of the tunable filter 424.

In a specific application, assuming that the current working wavelength required by the tunable filter 420 is λi, the temperature of the tunable filter 424 can be controlled by the temperature regulator 423 to adjust the channel wavelength of the tunable filter 424 to the working wavelength. λi. When incidents with multiple wavelengths (such as λ1 to λn) are incident, the externally applied electrical signal can be controlled to allow only certain specific wavelengths to pass at a certain moment. Specifically, as shown in Table 1: When the external electrical signal is V1, the temperature controller will make the tunable filter 424 generate a corresponding temperature as T1; when the temperature is T1, the tunable filter 424 can pass The wavelength of is λ1; at this time, the corresponding monitoring resistance value is R1, and the resistance value information of R1 can be introduced into the external circuit through the third first pin 422, so that the external circuit can determine the operating temperature of the tunable filter 424. Thereby, a corresponding relationship between the resistance value of the monitoring resistor and the passing wavelength can be established. When in use, if an optical signal of a certain wavelength is to be passed (such as λ1), only an external electrical signal (such as V1) needs to be applied to keep the resistance of the monitoring resistor at R1 to achieve the goal. Of course, in order to keep R1 stable in actual use, the external electrical signal V1 needs to be fine-tuned around its typical value based on the feedback of the monitoring resistor R1. When you want to switch to another wavelength used (such as λ2), you only need to change the external electrical signal (such as V2) so that the monitoring resistance remains at R2 to cut off other wavelengths and only allow λ2 to pass. The principle of switching the remaining wavelengths is similar.

Table 1

In the tunable filter 420 provided by the above-mentioned embodiment, a temperature regulator 423 is provided on the tunable filter 424, and the temperature of the tunable filter 424 is adjusted by an external circuit, so as to realize the rapid adjustment of the tunable filter 424. The passage of light of a specific wavelength and the cutoff of light of other wavelengths (wavelengths other than the specific wavelength). It can be seen that the optical module shown in the embodiment of the present application can dynamically select the wavelength of the received signal, thereby improving the utilization of optical network resources.

Please continue to refer to FIG. 6, the top of the tunable filter 420 is provided with an optical receiving sub-module 440. In a specific embodiment, the light receiving sub-module 440 may be fixed to the top of the tunable filter 420 by a connecting piece 430, for example, the connecting piece 430 may be partially embedded in the inside of the groove 415 and partly covered with the outside of the light receiving sub-module 440 . Specifically, referring to FIG. 14, the connecting member 430 includes: a boss 432 and a first receiving cavity 431 for receiving and fixing the light receiving submodule 440; the boss 432 is disposed on the bottom surface of the first receiving cavity 431; 432 is embedded in the groove 415 and the boss 432 is located on the top of the tunable filter 420. In other alternative embodiments, the connector 430 can also be replaced by other fasteners, as long as the fasteners can achieve mutual fixation and alignment between the light receiving submodule 440 and the tunable filter 420.

Please refer to FIG. 15 for the structure of the light receiving sub-module 440. The light receiving sub-module 440 may include: a first housing 441, a first base 442, and a light detector 443. The first housing 441 is disposed on a side wall of the first base 442 and forms a sealed receiving space together with the first base 442, and the receiving space is used for receiving the light detector 443. The photodetector 443 may include: a substrate 443a and a light receiving chip 443b, wherein the substrate 443a is disposed on the inner surface of the first base 442 to carry the light receiving chip 443b. The light receiving chip 443b and the second window 421b1 of the tunable filter 420 are aligned with each other to facilitate light transmission, and are used for photoelectric conversion of the optical signal emitted from the second window 421b1 after wavelength conversion by the tunable filter 420.

In some embodiments of the present application, a lens (not shown in the figure) may be provided between the light signal incident surface of the first housing 441 and the second window 421b1, the lens, the second window 421b1 and the first housing 441 Align with each other to facilitate light transmission. The lens is used to converge the light signal emitted from the second window 421b1 to the light receiving chip 443b. In some embodiments of the present application, the light receiving sub-module 440 may further include: a plurality of second pins 444, the second pins 444 are connected to the light detector 443 and extend from the first base 442, The two pins 444 can provide power to the light receiving chip 443b of the photodetector 443 on the one hand, and on the other hand can output the electrical signal formed by the photoelectric conversion of the light receiving chip 443b to other external devices.

Please continue to refer to FIG. 5, the optical fiber adapter 450 is connected to the first side wall of the rectangular tube body 410 and fixed to each other. Refer to Figure 16 for the structure of the fiber optic adapter 450. The fiber optic adapter 450 may be installed on the first side wall of the circular square tube body 410. Alternatively, the optical fiber adapter 450 may include: a first ferrule 451 and a second ferrule 452; one end of the first ferrule 451 is a bevel, the second ferrule 452 is arranged horizontally, and the bevel of the first ferrule 451 has an optical port, The beveled optical port has the same height as the light entrance or exit of the second ferrule 452. This contour design can improve the coupling efficiency of light between the first ferrule and the second ferrule. The first ferrule 451 is arranged obliquely to the second ferrule 452, that is, there is a tilt angle between the optical axis of the first ferrule 452 and the optical axis of the light emitting sub-module 460, which is smaller than the reflected SC/APC placed inside the optical fiber The inclination of the end face. For example, if the inclination angle of the reflected SC/APC end face inside the optical fiber is 6 degrees, the inclination angle between the optical axis of the second ferrule 452 and the optical axis of the light emitting sub-module 460 is 2.8 degrees. The inclination angle between the optical axis of the second ferrule 452 and the optical axis of the light emission sub-module 460 is smaller than the inclination angle of the reflected SC/APC end face placed inside the optical fiber, so that the central axis of the optical signal emitted from the optical fiber is The outer surface of the adapter 450 is parallel; thus, when coupling with the laser, the maximum coupling optical power efficiency is obtained.

In a feasible embodiment, a first lens 415 may be provided between the first side wall and the fiber optic adapter 450. The first lens 412 may be fixed inside the rectangular tube body 410. The first lens 415 may also be partially embedded in the surface of the first side wall and partially contained in the fiber optic adapter 450. The first lens 415 is used to collimate the output optical signal of the optical fiber in the optical fiber adapter 450, thereby converting the tapered optical signal of the output of the optical fiber into parallel light, so that the output optical signal of the optical fiber can be basically all from the first Two light transmission windows 412 enter the tunable filter 420.

Please continue to refer to FIG. 5, the light emitting sub-module 460 is connected to the third side wall of the circular square tube 410 and fixed to each other. Please refer to FIG. 17 for the structure of the fiber optic adapter 460. The light emitting sub-module 460 may include: a second housing 461, a second base 462, and a light emitter 463, and the light emitter 463 is disposed in a receiving space formed by the second housing 461 and the second base 462. The light emitting sub-module 460 may further include a plurality of third pins 464, the third pins 464 are connected to the light emitter 463 and extend from the second base 462, and the third pins 464 can provide the light emitter 463 provides power. On the other hand, the data to be transmitted by the optical transmitter 463 can be provided to the optical transmitter 463 for transmission in the form of optical signals.

In some embodiments of the present application, a second lens 416 may be installed between the light emitting sub-module 460 and the third side wall of the rectangular tube body 410. The second lens 416 is used to converge the optical signals emitted by the light emitting submodule 460 and emit them in parallel from the third light transmission window 413 to the first light transmission window 411. Wherein, the light emitting sub-module 460, the second lens 416, the third light transmission window 413 and the first light transmission window 411 are aligned with each other to facilitate light transmission.

In some embodiments of the present application, an isolator may be installed between the second lens 416 and the third side wall of the rectangular tube 410. The isolator only allows the optical signal emitted by the optical emission sub-module 460 to pass through, and blocks the optical signal emitted by the optical fiber. Wherein, the light emission sub-module 460, the second lens 416, the isolator 417, the third light transmission window 143 and the first light transmission window 411 are aligned with each other to facilitate light transmission.

In order to ensure that the light signals passing through the first lens 412 and the second lens 416 are emitted in parallel, the light emitting sub-module 460 can be connected to the third side wall of the circular square tube 410 through the second adjusting sleeve 480; 450 is connected to the first side wall of the rectangular tube body 410 through the first adjusting sleeve 470, and the position of the light emitting sub-module 460 is adjusted in the emission direction of the light emitting sub-module 460 by adjusting the second adjusting sleeve 480. The position of the optical fiber in the light emission direction of the light emission sub-module 460 is adjusted by adjusting the first adjustment sleeve 470.

The specific adjustment method is to first combine the WDM filter 414 and the first lens 415 as a whole to couple with the light emitted by the optical fiber to obtain parallel light. The specific coupling method is: first place the isolator 417 at the front end of the WDM filter 414 (the front end is the front end in the propagation direction of the optical signal emitted by the optical fiber), and ensure that the normal direction of the WDM filter 414 and the first lens 415 The optical axis direction is parallel, and a white screen is placed at a distance from the front end of the WDM filter 414. Then input a beam of red light into the optical fiber, and adjust the position of the optical fiber adapter 450 by adjusting the length of the first adjusting sleeve 470 to minimize the red dot on the white screen. At this time, the optical signal emitted by the optical fiber passes through the first The lens shoots out in parallel.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the application, not to limit them; although the application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: The technical solutions recorded in the foregoing embodiments are modified, or some of the technical features are equivalently replaced; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

An optical module, characterized in that it comprises:

A round tube body, one end of which is provided with a light emitting sub-module, the other end of which is provided with an optical fiber adapter, and the top of which is provided with a groove;

The adjustable filter is arranged in the groove;

The light receiving sub-module is arranged on the upper part of the groove;

The tunable filter includes:

A housing, the upper and lower surfaces of which are respectively provided with a first window and a second window;

The temperature regulator is arranged on the lower surface of the housing, and the upper and lower surfaces thereof have light-transmitting through holes; the first window, the light-transmitting through hole, and the second window are aligned with each other to facilitate light transmission ；

The tunable filter is arranged at the light-transmitting hole on the upper surface of the temperature regulator;

One end of the first pin extends into the housing through the side wall of the housing and is electrically connected to the temperature regulator; the other end is electrically connected to the circuit board.
5. The optical module of claim 1, further comprising a connector;

The connecting piece includes a boss and a first receiving cavity for receiving the light receiving sub-module;

The boss is arranged on the bottom surface of the first receiving cavity, the boss is embedded in the groove, and the

The boss is located on the top of the tunable filter.
The optical module according to claim 1, wherein the optical fiber adapter comprises: a first ferrule and a second ferrule; the second ferrule is arranged obliquely to the first ferrule, and the first ferrule One end of the core is an inclined surface, and the height of the light port of the inclined surface is the same as the height of the light entrance port of the second ferrule.
5. The optical module of claim 1, wherein the top of the round tube body further comprises a notch for avoiding the first pin.
The optical module according to claim 1, wherein the tunable filter further comprises:

Temperature monitor

The temperature monitor is arranged closely to the temperature regulator, and the temperature monitor is arranged closely to the tunable filter.
The optical module according to claim 1, wherein a WDM filter is arranged inside the circular square tube, and the WDM filter is arranged at the center of the circular square tube at a threshold inclination angle;

A first lens is arranged between the WDM filter and the optical fiber adapter;

A second lens is arranged between the WDM filter and the light emission sub-module.
The optical module according to claim 6, further comprising an isolator;

The isolator is arranged between the WDM filter and the second lens.
The optical module according to claim 6 or 7, further comprising: a first adjusting sleeve and a second adjusting sleeve;

The optical fiber adapter is connected to the round tube body through the first adjusting sleeve;

The light emitting sub-module is connected with the round tube body through the second adjusting sleeve.