WO2022100278A1

WO2022100278A1 - Optical module

Info

Publication number: WO2022100278A1
Application number: PCT/CN2021/118902
Authority: WO
Inventors: 濮宏图; 慕建伟; 薛登山; 吴涛
Original assignee: 青岛海信宽带多媒体技术有限公司
Priority date: 2020-11-11
Filing date: 2021-09-17
Publication date: 2022-05-19

Abstract

An optical module (200), comprising: a circuit board (300); a first laser chip (404a1) that is electrically connected to the circuit board (300) and can emit light of a first wavelength and a second wavelength; a first filter (4054) that receives the light emitted by the first laser chip (404a1) and can reflect the light of the first wavelength and transmit the light of the second wavelength; a second filter (4057) that receives the light emitted by a second laser chip (404a2) and can reflect the light of the second wavelength and transmit the light of the first wavelength; and a wave combination component that can receive the light of the first wavelength reflected from the first filter (4054), receive the light of the second wavelength reflected from the second filter (4057), and combine the received light of the first wavelength and light of the second wavelength into one beam.

Description

an optical module

This disclosure requires that it be submitted to the China Patent Office on November 11, 2020, the application number is 202011256470.6, the patent name is "an optical module", and the application number is 202011251595.X, and the patent is submitted to the China Patent Office on November 11, 2020. Priority entitled "An Optical Module", the entire contents of which are incorporated by reference in this disclosure.

technical field

The present disclosure relates to the technical field of optical communication, and in particular, to an optical module.

Background technique

Optical communication technology will be used in new business and application modes such as cloud computing, mobile Internet, and video. The optical module realizes the function of photoelectric conversion in the field of optical communication technology, and is one of the key components in optical communication equipment. The optical signal intensity input by the optical module to the external optical fiber directly affects the quality of optical fiber communication.

SUMMARY OF THE INVENTION

In a first aspect, embodiments of the present disclosure provide an optical module, including a circuit board; a first laser chip, electrically connected to the circuit board, and configured to emit light of a first wavelength and a second wavelength; a first filter, is configured to receive the light emitted by the first laser chip, reflect the light of the first wavelength, and transmit the light of the second wavelength; the second laser chip, electrically connected to the circuit board, is configured to emit the light of the second wavelength. the light of the first wavelength and the second wavelength; a second filter, configured to receive the light emitted by the second laser chip, reflect the light of the second wavelength, and transmit the light of the first wavelength; a multiplexing component configured to receive light of a first wavelength reflected from the first filter, receive light of a second wavelength reflected from the second filter, and combine the received light of the first wavelength and the light of the second wavelength are combined into one beam.

In a second aspect, the present disclosure provides an optical module, comprising: a circuit board; an optical emission sub-module electrically connected to the circuit board for outputting signal light; wherein the optical emission sub-module includes: a first laser The chip is used to generate the first wavelength signal light, and the first laser chip generates the second wavelength light when it is turned off and on; the first polarization beam splitter is arranged on the output optical path of the first laser chip, using for transmitting the signal light of the first wavelength and the light of the second wavelength according to the polarization state of the signal light of the first wavelength and the light of the second wavelength; a first polarization state conversion device and a first narrow-band filter, are sequentially arranged on the transmission light path of the first polarization beam splitter, the first narrowband filter is used for transmitting the second wavelength light and for reflecting the first wavelength signal light, the first polarization state The conversion device is used to change the polarization state of the first wavelength signal light; the polarization state conversion device is arranged on the reflected light path of the first polarization beam splitter, and is used to transmit the first wavelength signal light and change the The polarization state of the signal light of the first wavelength; the second laser chip, which is used to generate the signal light of the second wavelength, and the second laser chip generates the light of the first wavelength when it is turned off and on; the second polarization beam splitter, the A second polarization beam splitter is arranged on the output optical path of the second laser chip, and is used for split optical path transmission according to the polarization states of the first wavelength signal light, the second wavelength signal light and the first wavelength light The first wavelength signal light, the second wavelength signal light and the first wavelength light; the second polarization conversion device and the second narrow-band filter, which are sequentially arranged on the transmitted light of the second polarization beam splitter On the way, the second narrowband filter is used for transmitting the first wavelength light and for reflecting the second wavelength signal light, and the second polarization state conversion device is used for adjusting the polarization of the second wavelength signal light state.

In a third aspect, the present disclosure provides an optical module, comprising: a circuit board; a light emission sub-module electrically connected to the circuit board for outputting signal light; wherein the light emission sub-module includes: a first laser chip , used to generate the first wavelength signal light, the first laser chip generates the second wavelength light when it is turned off and on; the first polarization beam splitter is arranged on the output optical path of the first laser chip, used for The signal light of the first wavelength and the light of the second wavelength are transmitted according to the polarization state of the signal light of the first wavelength and the light of the second wavelength; the first polarization state conversion device and the first narrowband filter are sequentially arranged on the transmission light path of the first polarization beam splitter, the first narrowband filter is used for transmitting the second wavelength light and for reflecting the first wavelength signal light, and the first polarization state is converted The device is used to change the polarization state of the first wavelength signal light; the second laser chip is used to generate the second wavelength signal light, and the second laser chip generates the first wavelength light when it is turned off and on; the polarization state is converted a device, arranged on the output optical path of the first laser chip, for changing the polarization state of the second wavelength signal light and the first wavelength light; a second polarization beam splitter, arranged on the polarization state conversion The output optical path of the device is located on the reflected optical path of the first polarization beam splitter, and is used for transmitting the second wavelength signal light according to the polarization state of the second wavelength signal light and the polarization state of the first wavelength light. and the first wavelength light; a second polarization state conversion device and a second narrow-band filter are sequentially arranged on the reflected light path of the second polarization beam splitter, and the second narrow-band filter is used to transmit the first A wavelength of light is used to reflect the second wavelength of signal light, and the second polarization state conversion device is used to change the polarization state of the second wavelength of signal light.

In a fourth aspect, the present disclosure provides an optical module, comprising: a circuit board; an optical emission sub-module electrically connected to the circuit board for outputting signal light; wherein the optical emission sub-module includes: a first laser The chip is used to generate the signal light of the first wavelength, and the first laser chip generates the light of the second wavelength when it is turned off and on; the second laser chip is used to generate the signal light of the second wavelength, and the second laser chip is in the A first wavelength light is generated when turned off and on; a polarization beam splitter assembly includes a first input end, a second input end, a polarization beam splitter, a polarization state conversion device, a first output end, a second output end and a third output end, the first input end is optically connected to the first laser chip, and the polarization state conversion device and the polarization beam splitter are combined for the first wavelength signal light and the second wavelength light and the Separation of the second wavelength signal light and the first wavelength light transmission optical path, so that the first output end is used to output the first wavelength signal light and the second wavelength signal light; a first narrowband filter, The second narrowband filter is arranged on the output light path of the second output end, and is used to transmit the second wavelength light and reflect the first wavelength signal light; the second narrowband filter is arranged on the output light of the third output end On the way, it is used for transmitting the first wavelength light and for reflecting the second wavelength signal light.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present disclosure more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some of the present disclosure. In the embodiments, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without any creative effort.

FIG. 1 is a connection diagram of an optical communication system according to some embodiments;

2 is a structural diagram of an optical network terminal according to some embodiments;

3 is a structural diagram of an optical module according to some embodiments;

4 is an exploded structure of an optical module according to some embodiments;

5 is a cross-sectional view of an optical module structure according to some embodiments;

6 is a schematic diagram of an assembly structure of an optical emission sub-module and an optical fiber socket according to some embodiments;

FIG. 7 is an exploded view of a light emission sub-module structure according to some embodiments;

8 is a schematic structural diagram of a light emission sub-module according to some embodiments;

FIG. 9 is a schematic structural diagram of another light emitting sub-module according to some embodiments.

Detailed ways

The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, but not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present disclosure.

In optical communication technology, light is used to carry the information to be transmitted, and the optical signal carrying the information is transmitted to information processing equipment such as computers through information transmission equipment such as optical fibers or optical waveguides to complete the transmission of information. Since optical signals have passive transmission characteristics when transmitted through optical fibers or optical waveguides, low-cost and low-loss information transmission can be achieved. In addition, the signals transmitted by information transmission equipment such as optical fibers or optical waveguides are optical signals, while the signals that can be recognized and processed by information processing equipment such as computers are electrical signals. To establish an information connection between them, it is necessary to realize the mutual conversion of electrical signals and optical signals.

The optical module realizes the mutual conversion function of the above-mentioned optical signal and electrical signal in the technical field of optical fiber communication. The optical module includes an optical port and an electrical port. The optical module realizes optical communication with information transmission equipment such as optical fibers or optical waveguides through the optical port, and realizes electrical connection with an optical network terminal (for example, an optical cat) through the electrical port. It is mainly used to realize power supply, I2C signal transmission, data signal transmission and grounding; optical network terminals transmit electrical signals to information processing equipment such as computers through network cables or wireless fidelity technology (Wi-Fi).

FIG. 1 is a connection diagram of an optical communication system according to some embodiments. As shown in FIG. 1 , the optical communication system mainly includes a remote server 1000, a local information processing device 2000, an optical network terminal 100, an optical module 200, an optical fiber 101 and a network cable 103;

One end of the optical fiber 101 is connected to the remote server 1000 , and the other end is connected to the optical network terminal 100 through the optical module 200 . The optical fiber itself can support long-distance signal transmission, such as signal transmission of several kilometers (6 kilometers to 8 kilometers). On this basis, if repeaters are used, ultra-long distance transmission can theoretically be achieved. Therefore, in a common optical communication system, the distance between the remote server 1000 and the optical network terminal 100 can usually reach several kilometers, tens of kilometers or hundreds of kilometers.

One end of the network cable 103 is connected to the local information processing device 2000 , and the other end is connected to the optical network terminal 100 . The local information processing device 2000 may be any one or more of the following devices: a router, a switch, a computer, a mobile phone, a tablet computer, a television, and the like.

The physical distance between the remote server 1000 and the optical network terminal 100 is greater than the physical distance between the local information processing device 2000 and the optical network terminal 100 . The connection between the local information processing device 2000 and the remote server 1000 is completed by the optical fiber 101 and the network cable 103 ; and the connection between the optical fiber 101 and the network cable 103 is completed by the optical module 200 and the optical network terminal 100 .

The optical module 200 includes an optical port and an electrical port. The optical port is configured to be connected to the optical fiber 101, so that the optical module 200 and the optical fiber 101 can establish a two-way optical signal connection; electrical signal connection. The optical module 200 realizes the mutual conversion of optical signals and electrical signals, so as to establish a connection between the optical fiber 101 and the optical network terminal 100 . For example, the optical signal from the optical fiber 101 is converted into an electrical signal by the optical module 200 and then input into 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 200 and input into the optical fiber 101 .

The optical network terminal 100 includes a substantially rectangular housing, and an optical module interface 102 and a network cable interface 104 disposed on the housing. The optical module interface 102 is configured to access the optical module 200, so that the optical network terminal 100 and the optical module 200 can establish a bidirectional electrical signal connection; the network cable interface 104 is configured to access the network cable 103, so that the optical network terminal 100 and the network cable 103 are connected. Establish a two-way electrical signal connection. A connection is established between the optical module 200 and the network cable 103 through the optical network terminal 100 . For example, the optical network terminal 100 transmits the electrical signal from the optical module 200 to the network cable 103, and transmits the signal from the network cable 103 to the optical module 200. Therefore, the optical network terminal 100, as the host computer of the optical module 200, can monitor the optical module 200. work. In addition to the optical network terminal 100, the host computer of the optical module 200 may also include an optical line terminal (Optical Line Terminal, OLT) and the like.

A bidirectional signal transmission channel is established between the remote server 1000 and the local information processing device 2000 through the optical fiber 101 , the optical module 200 , the optical network terminal 100 and the network cable 103 .

FIG. 2 is a structural diagram of an optical network terminal according to some embodiments. In order to clearly show the connection relationship between the optical module 200 and the optical network terminal 100 , FIG. 2 only shows the structure of the optical network terminal 100 related to the optical module 200 . As shown in FIG. 2 , the optical network terminal 100 further includes a PCB circuit board 105 disposed in the housing, a cage 106 disposed on the surface of the PCB circuit board 105 , and an electrical connector disposed inside the cage 106 . The electrical connector is configured to be connected to the electrical port of the optical module 200 ; the heat sink 107 has protrusions such as fins that increase the heat dissipation area.

The optical module 200 is inserted into the cage 106 of the optical network terminal 100 , and the optical module 200 is fixed by the cage 106 . After the optical module 200 is inserted into the cage 106 , the electrical port of the optical module 200 is connected to the electrical connector inside the cage 106 , so that the optical module 200 and the optical network terminal 100 establish a bidirectional electrical signal connection. In addition, the optical port of the optical module 200 is connected to the optical fiber 101 , so that the optical module 200 and the optical fiber 100 establish a bidirectional electrical signal connection.

FIG. 3 is a structural diagram of an optical module according to some embodiments, and FIG. 4 is an exploded structural diagram of an optical module according to some embodiments. As shown in FIG. 3 and FIG. 4 , the optical module 200 includes a housing, a circuit board 300 disposed in the housing, and an optical sub-module;

The casing includes an upper casing 201 and a lower casing 202. The upper casing 201 is covered on the lower casing 202 to form the above casing with two

openings

204 and 205; the outer contour of the casing generally presents a square body.

In some embodiments, the lower casing 202 includes a bottom plate and two lower side plates located on both sides of the bottom plate and perpendicular to the bottom plate; the upper casing 201 includes a cover plate, and two side plates located on both sides of the cover plate and perpendicular to the cover plate. An upper side plate is combined with the two side plates by two side walls, so as to realize that the upper casing 201 is covered on the lower casing 202 .

The direction of the connection between the two

openings

204 and 205 may be consistent with the length direction of the optical module 200 , or may be inconsistent with the length direction of the optical module 200 . Illustratively, the opening 204 is located at the end of the light module 200 (the left end of FIG. 3 ), and the opening 205 is also located at the end of the light module 200 (the right end of FIG. 3 ). Alternatively, the opening 204 is located at the end of the optical module 200, and the opening 205 is located at the side of the optical module 200. The opening 204 is an electrical port, and the golden fingers of the circuit board 300 protrude from the electrical port 204 and are inserted into the host computer (such as the optical network terminal 100 ); The optical fiber 101 is connected to the optical sub-module inside the optical module 200 .

The combination of the upper casing 201 and the lower casing 202 is used to facilitate the installation of components such as the circuit board 300 and the optical sub-module into the casing. The upper casing 201 and the lower casing 202 can form encapsulation protection for these components. In addition, when assembling components such as the circuit board 300, it is convenient to deploy the positioning components, heat dissipation components and electromagnetic shielding components of these components, which is conducive to the implementation of automated production.

In some embodiments, the upper casing 201 and the lower casing 202 are generally made of metal material, which is beneficial to achieve electromagnetic shielding and heat dissipation.

In some embodiments, the optical module 200 further includes an unlocking component 203 located on the outer wall of the housing thereof, and the unlocking component 203 is configured to realize a fixed connection between the optical module 200 and the upper computer, or release the connection between the optical module 200 and the upper computer fixed connection.

For example, the unlocking components 203 are located on the outer walls of the two lower side panels 2022 of the lower casing 202, and include engaging components matching with the cage of the upper computer (eg, the cage 106 of the optical network terminal 100). When the optical module 200 is inserted into the cage of the upper computer, the optical module 200 is fixed in the cage of the upper computer by the engaging part of the unlocking part 203; when the unlocking part 203 is pulled, the engaging part of the unlocking part 203 moves accordingly, thereby changing the The connection relationship between the engaging member and the host computer is used to release the engaging relationship between the optical module 200 and the host computer, so that the optical module 200 can be pulled out from the cage of the host computer.

The circuit board 300 includes circuit traces, electronic components (such as capacitors, resistors, triodes, MOS tubes) and chips (such as MCU, laser driver chip, limiter amplifier chip, clock data recovery CDR, power management chip, data processing chip DSP) Wait.

The circuit board 300 connects the above-mentioned devices in the optical module 200 together according to the circuit design through circuit traces, so as to realize functions such as power supply, electrical signal transmission, and grounding.

The circuit board 300 is generally a rigid circuit board. Due to its relatively hard material, the rigid circuit board can also realize the bearing function. For example, the rigid circuit board can carry chips smoothly; the rigid circuit board can also be inserted into the electrical connector in the upper computer cage. , in some embodiments of the present disclosure, metal pins/gold fingers are formed on one end surface of the rigid circuit board for connecting with the electrical connector; these are inconvenient to be realized by the flexible circuit board.

Flexible circuit boards are also used in some optical modules; flexible circuit boards are generally used in conjunction with rigid circuit boards. For example, a flexible circuit board can be used to connect the rigid circuit board and the optical sub-module as a supplement to the rigid circuit board.

The optical module further includes an optical transmitting sub-module and an optical receiving sub-module, and the optical transmitting sub-module and the optical receiving sub-module may be collectively referred to as an optical sub-module. As shown in FIG. 4 , the optical module provided by the embodiment of the present disclosure includes an optical transmitting sub-module 400 and an optical receiving sub-module 500 , the optical transmitting sub-module 400 is located at the edge of the circuit board 300 , and the optical transmitting sub-module 400 and the optical receiving sub-module 500 The staggered arrangement on the surface of the circuit board 300 is beneficial to achieve better electromagnetic shielding effect.

The light emitting sub-module 400 is disposed on the surface of the circuit board 300. In another common packaging method, the light emitting sub-module is physically separated from the circuit board and electrically connected through a flexible board. In the embodiment of the present disclosure, the light emitting sub-module 400 is connected to the first optical fiber socket 502 through the first optical fiber 501 .

The light emitting sub-module 400 is located in the enclosing cavity formed by the upper and lower casings. As shown in FIG. 4 , the circuit board 300 is provided with a notch 301 for placing the light emitting sub-module; the notch 301 can be arranged in the middle of the circuit board or at the edge of the circuit board; the light emitting sub-module is embedded in a way It is arranged in the notch 301 of the circuit board, so that the circuit board can extend into the inside of the light emitting sub-module, and it is also convenient to fix the light emitting sub-module and the circuit board together. In some embodiments of the present disclosure, the light emitting sub-module 400 may be fixedly supported by the lower case 202 .

The light receiving sub-module 500 is disposed on the surface of the circuit board 300. In another common packaging method, the light receiving sub-module is physically separated from the circuit board and electrically connected through a flexible board. In the embodiment of the present disclosure, the light receiving sub-module 500 is connected to the second optical fiber socket 504 through the second optical fiber 503 . The signal light outside the optical module is transmitted to the second optical fiber socket 504 through the external optical fiber and transmitted to the second optical fiber 503, and then transmitted to the light receiving sub-module 500 through the second optical fiber 503, and the receiving sub-module 500 converts the received signal light into electric current Signal.

In certain embodiments of the present disclosure, the light receiving sub-module 500 includes an optical device and an optoelectronic replacement device. Wherein, the optical device may be an optical fiber adapter, an arrayed waveguide grating, a lens, and the like. The second optical fiber 503 transmits the signal light to the optical device, and then converts the transmission path of the signal light beam to the optical device, and finally transmits it to the optoelectronic replacement device.

FIG. 5 is a cross-sectional view of an optical module structure according to some embodiments. As shown in FIG. 5 , the optical module provided by the embodiment of the present disclosure includes a lower casing 202 , a circuit board 300 , a light emitting sub-module 400 and an optical receiving sub-module 500 . The light-emitting sub-module 400 and the light-receiving sub-module 500 are located on the circuit board 300 .

The first optical fiber socket 502 is connected to the light emitting sub-module 400 through the first optical fiber 501 , and the second optical fiber socket 504 is connected to the optical receiving sub-module 500 through the second optical fiber 503 . The following description will be given by taking the connection between the first optical fiber socket 502 and the light emitting sub-module 400 through the first optical fiber 501 as an example.

The lower casing 202 is used for carrying the circuit board 300 and the second optical fiber socket 502 , and the circuit board 300 carries the light emitting sub-module 400 . In some embodiments of the present disclosure, the lower case 202 has a card slot 206 with a gap 206 a in the card slot 206 , and the card slot 206 may be formed by a surface of the lower case protruding upward.

The first optical fiber socket 502 includes a main body 502a and a protrusion 502b, and the protrusion 502b is located on the surface of the main body 502a. The first optical fiber socket 502 is assembled and fixed with the slot 206 on the lower casing 202 . In some embodiments of the present disclosure, by placing the protrusion 502b in the gap 206a of the card slot 206, the optical fiber socket is fixed on the lower housing. In some embodiments of the present disclosure, reference may be made to the first optical fiber socket 502 for the structure and fixing manner of the second optical fiber socket 504 .

The card slot 206 divides the lower casing into two areas, the circuit board 300 is arranged in one of the areas, and a convex column is formed on the surface of the lower casing in this area to fix the circuit board 300 ; the light emitting sub-module 400 is fixed to the circuit board 300 Together, by fixing the circuit board 300, the light emitting sub-module is fixed on the lower casing. Of course, the light emitting sub-module can also be directly fixed on the lower casing, and does not need to be indirectly fixed through the circuit board 300 .

The optical fiber socket is arranged in the other area, and the external optical fiber plug extends into the other area to be butted with the optical fiber socket. Therefore, the circuit board 300 and the optical fiber socket are respectively fixed on the lower casing, that is, the positions of the optical emitting sub-module 400 and the optical fiber socket 502 are relatively fixed. Therefore, the optical fiber 501a connecting the optical emitting sub-module and the optical fiber socket needs to have a specific size .

FIG. 6 is a schematic diagram of an assembly structure of a light emitting sub-module and an optical fiber socket according to some embodiments. As shown in FIG. 6 , the optical emitting sub-module 400 is connected to the first optical fiber socket 502 through the optical fiber adapter 600 and the first optical fiber 501 in sequence. One end of the first optical fiber 501 is connected to the optical fiber adapter 600 , and the other end is connected to the first optical fiber socket 502 .

The optical fiber adapter 600 is used to be inserted into the optical emission sub-module to receive the light converged by the optical lens; the first optical fiber socket 502 is respectively connected with the first optical fiber 501 and the optical fiber plug outside the optical module, and is used to realize the internal and external optical modules of the optical module. The light of the optical transmission sub-module is connected to the optical fiber through the optical fiber adapter, and is transmitted from the optical fiber to the first optical fiber socket 502, and then transmitted to the outside of the optical module through the first optical fiber socket 502.

FIG. 7 is an exploded view of the structure of a light emitting sub-module according to some embodiments. As shown in FIG. 7 , the light emitting sub-module provided by the embodiment of the present disclosure is provided with a laser component 404 , and the laser component 404 includes a laser chip 404 a , a collimating lens 404 b , a metallized ceramic 404 c and a semiconductor refrigerator 404 d . The common light emitting chip of the optical module is a laser chip. The laser chip 404a is arranged on the surface of the metallized ceramic 404c. The surface of the metallized ceramic 404c forms a circuit pattern, which can supply power to the laser chip; at the same time, the metallized ceramic 404C has better thermal conductivity. , which can be used as a heat sink for the laser chip 404a to dissipate heat. Laser has become the preferred light source for optical modules and even optical fiber transmission due to its better single-wavelength characteristics and better wavelength tuning characteristics; other types of light, such as LED light, are generally not used in common optical communication systems, even if special optical communication systems. This kind of light source is used in the light source, and the characteristics and chip structure of the light source are quite different from those of the laser, so that there is a big technical difference between the optical module using the laser and the optical module using other light sources. Those skilled in the art generally do not think that These two types of optical modules can give technical inspiration to each other.

The function of the optical lens is to condense light, and the light emitted from the light emitting chip is in a divergent state. In order to facilitate the subsequent optical path design and light coupling into the optical fiber, it needs to be converged. Common convergence converges divergent light into parallel light, and converges divergent light and parallel light into convergent light. Fig. 7 shows a collimating lens 404b and a focusing lens 407. The collimating lens 404b is arranged on the light exit light path of the laser chip to condense the divergent light of the laser chip into parallel light; the focusing lens 407 is arranged close to the optical fiber On the side of the adapter 600 , the parallel light is collected into the optical fiber adapter 600 .

In some embodiments, a semiconductor cooler TEC 404d is also included in the light emitting sub-module. The TEC404d is directly or indirectly arranged on the bottom surface of the light emitting sub-module cavity, and the metallized ceramic is arranged on the surface of the TEC404d. The TEC404d is used to balance the heat to maintain the set operating temperature of the laser chip.

The light emitting sub-module has a packaging structure to encapsulate the laser chips. The existing packaging structures include coaxial packaging TO-CAN, silicon optical packaging, chip-on-board lens assembly packaging COB-LENS, and micro-optic XMD packaging. The package is also divided into airtight packaging and non-airtight packaging. On the one hand, the package provides a stable and reliable working environment for the laser chip, and on the other hand, it forms the external electrical connection and light output.

According to the product design and process, the optical module will use different packages to make the light emitting sub-module. The laser chip has vertical cavity surface light emission and edge light emission. The difference in the light output direction of the laser chip will also affect the choice of packaging form. There are obvious technical differences between various packages, both in terms of structure and process, which are different technical directions. Those skilled in the art know that although the purposes achieved by different packages have certain similarities, different packages belong to different technical routes. , different packaging technologies will not give technical inspiration to each other.

As shown in FIG. 6 and FIG. 7 , the light emission sub-module 400 provided by the embodiment of the present disclosure further includes a cover plate 401 and a light emission sub-module cavity (hereinafter referred to as the cavity) 402 , and the cover plate 401 covers the cavity from above. 402, a side wall of the cavity 402 has an opening 403 for inserting the circuit board 300, and the circuit board 300 is fixed to the lower casing of the optical module. A laser assembly 404 is provided in the cavity 402, and the circuit board 300 extending into the cavity is electrically connected to the laser assembly 404. The laser assembly has a laser chip, and may also include components such as a collimating lens to form collimated light output. In some optical modules, the cavity 402 is provided with an optical multiplexing component, and the light from the laser component 404 is combined into a beam of light through the optical multiplexing component, so that the beam of light includes light of different wavelengths. The other side wall of the cavity 402 has a through hole 406 , and a beam of light combined by the optical multiplexing component is injected into the through hole 406 . A focusing lens 407 can also be arranged between the through hole 406 and the light multiplexing component, and the light is collected by the focusing lens so as to facilitate subsequent coupling of the light. The fiber optic adapter 600 extends into the through hole 406 to couple and receive the light from the optical multiplexing component, the tail of the fiber optic adapter is connected to the first fiber socket 502 through the first optical fiber 501, and the light received by the fiber optic adapter 600 is transmitted to the first fiber through the first optical fiber 501. A fiber optic socket 502 .

In use, it is found that when any laser chip is turned on or off, light of non-operating wavelength will be generated, and when the light of non-operating wavelength is the same as the signal light of operating wavelength generated by other laser chips, the laser chip will generate light of non-operating wavelength. The resulting signal light produces chirped crosstalk. In order to avoid chirping and crosstalk to the signal light generated by other laser chips when the laser chip is turned on or off, the light of the non-operating wavelength will be generated. A filter and a second filter, etc., the multiplexing component, the first filter and the second filter are arranged in the cavity 402 . In the embodiment of the present disclosure, the band-pass filtering effect of the first filter and the second filter is used to realize that the light of the working wavelength and the light of the non-working wavelength are directed in different directions; The light of the working wavelength is combined, so that the light of the non-working wavelength is filtered out of the final output light, and a single beam is output.

The optical module provided by the embodiment of the present disclosure includes a first laser chip, which is electrically connected to the circuit board and capable of emitting light of a first wavelength and a second wavelength; a first filter, which receives the light emitted by the first laser chip , which can reflect the light of the first wavelength and transmit the light of the second wavelength; the second laser chip, which is electrically connected to the circuit board, can emit light of the first wavelength and the second wavelength; The second filter, which receives the light emitted by the second laser chip, can reflect the light of the second wavelength and transmit the light of the first wavelength; The light of one wavelength is received by the light of the second wavelength reflected from the second filter, and the received light of the first wavelength and the light of the second wavelength are combined into one beam.

The first wavelength is the working wavelength of the first laser chip; the second wavelength is the working wavelength of the second laser chip, and the light emitted by the first laser chip and the second laser chip have overlapping wavelengths.

The wave combining component realizes the beam combining of light by utilizing the polarization principle of light, and includes a first polarizer, one side of the first polarizer can receive the light of the first wavelength and the first polarization state; the other side of the first polarizer One side can receive the light of the second wavelength and the second polarization state; the first polarizer can transmit the light of the first polarization state and can reflect the light of the second polarization state, so as to realize the light of the first wavelength and the light of the second polarization state. The photosynthetic beam of the second wavelength.

Lights of different polarization states can be obtained by using a polarization state changing device. When the light passes through the polarization state changing device, the polarization state of the light will change regularly. Using this principle, combined with the polarization state of the light before the incident polarization state changing device , the polarization state of the light after the device is changed by the polarization state can be known.

The light emitted by the first laser chip and the second laser chip can be in the same polarization state or in different polarization states; when the light emitted by the first laser chip and the second laser chip has the same polarization state, they pass through the first polarization state respectively. After changing the device and the second polarization state changing device, the polarization states of the two beams of light are still the same, and the different polarization states cannot be used for multiplexing, so the multiplexing component also includes a third polarization state changing device, which is different from the first polarization state changing device. When used in conjunction with each other, the polarization state of the light from the first laser chip is changed again to obtain light with two different polarization states, and then the different polarization states can be used to combine waves.

The light emitted by the first laser chip and the second laser chip can be in different polarization states. After passing through the first polarization state changing device and the second polarization state changing device respectively, the polarization states of the two beams of light are still different. The difference of the state can be combined without using a third polarization state to change the device.

The technical solutions provided by the present disclosure will be described in detail below with reference to specific examples.

FIG. 8 is a schematic structural diagram of a light emitting sub-module according to some embodiments. As shown in FIG. 8 , the light emission sub-module provided by the embodiment of the present disclosure includes a first laser chip 404a1 and a second laser chip 404a2 , and also includes a beam splitting component 405 , a first filter 4054 and a second filter 4057 . Wherein: when the first laser chip 404a1 works normally, it generates the first wavelength signal light, which is denoted as the first wavelength signal light λ1, and the first laser chip 404a1 generates the second wavelength light when it is turned off and on, which is denoted as the second wavelength light. λ2; when the second laser chip 404a2 works normally, it generates the second wavelength signal light, which is denoted as the second wavelength signal light λ2, and the first laser chip 404a1 generates the first wavelength light when it is turned off and on, which is denoted as the first wavelength light. λ1. The first filter 4054 is used to filter out the second wavelength light λ2, the second filter 4057 is used to filter out the first wavelength light λ1, and then the beam splitting component 405, the first filter 4054 and the second filter 4057 are combined, For realizing that the first laser chip 404a1 generates the second wavelength light λ2 when the first laser chip 404a1 is turned off and on and is leaked through the first filter 4054 and does not produce crosstalk to the second wavelength signal light λ2 when the second laser chip 404a2 operates, and When the second laser chip 404a2 is turned off and on, the first wavelength light λ1 is leaked out through the second filter 4057 and will not cause crosstalk to the first wavelength signal light λ1 when the first laser chip 404a1 is working, thereby avoiding the optical module When the laser chip 404a is turned on or off, chirp crosstalk occurs between the laser chips 404a

In some embodiments, the beam splitting assembly 405 includes a first polarization beam splitter 4051, a third polarization state changing device 4052, a first polarization state changing device 4053, a second polarization beam splitter 4055, and a second polarization state changing device 4056, the third polarization state changing device 4052, the first polarization state changing device 4053 and the second polarization state changing device 4056 cooperate with the multiplexing component to realize the optical path. In some embodiments of the present disclosure: the first polarization beam splitter 4051 is arranged on the output optical path of the first laser chip 404a1; the first polarization state changing device 4053 and the first filter 4054 are arranged in sequence on the first polarization the transmission light path of the beam splitter 4051; the third polarization state changing device 4052 is arranged on the reflected light path of the first polarization beam splitter 4051; the second polarization beam splitter 4055 is arranged on the output light path of the second laser chip 404a2, and The reflection light path of the second polarization beam splitter 4055 reflects the signal light of the designated working wavelength of the second laser chip 404a2 and transmits the signal light of the designated working wavelength of the first laser chip 404a1; the second polarization state changing device 4056 and the second filter 4057 are in sequence It is arranged on the transmission light path of the second polarizing beam splitter 4055 .

As shown in FIG. 8 , the light generated when the first laser chip 404a1 is turned off, turned on and in normal operation is linearly polarized light, and the polarization direction is parallel to the paper surface (two-way arrow in the figure); the second laser chip 404a2 is turned off and on And the light generated during normal operation is linearly polarized light, and the polarization direction is parallel to the paper surface (two-way arrow in the figure). The first wavelength signal light λ1 is incident on the first polarization beam splitter 4051 along the output optical path of the first laser chip 404a1, passes through the first polarization beam splitter 4051, and is then transmitted to the first polarization beam splitter 4051 along the transmission optical path of the first polarization beam splitter 4051. A polarization state changing device 4053 is transmitted to the first filter 4054 through the first polarization state changing device 4053; since the first filter 4054 is used to filter out the second wavelength light λ2, the first wavelength signal light λ1 is filtered by the first filter The sheet 4054 is reflected back to the first polarization state changing device 4053, the first wavelength signal light λ1 passes through the first polarization state changing device 4053 again and is re-incident to the first polarization beam splitter 4051, and the first wavelength signal light λ1 transmits the first Compared with the first wavelength signal light passing through the first polarization state changing device for the first time, the polarization state of the polarization state changing device 4053 is rotated by 90°, that is, the polarization direction is perpendicular to the paper surface (in the figure), and then re-incident to the first wavelength signal light. The first wavelength signal light λ1 of the polarization beam splitter 4051 will be transmitted along the reflected light path of the first polarization beam splitter 4051, and will be transmitted to the third polarization state changing device 4052 along the reflected light path of the first polarization beam splitter 4051. The polarization state changing device 4052 changes the polarization direction by 90° again, and the polarization direction is parallel to the paper plane, and then enters the second polarization beam splitter 4055, and finally transmits the second polarization beam splitter 4055 and reflects along the second polarization beam splitter 4055. Optical output. The second wavelength light λ2 is incident on the first polarization beam splitter 4051 along the output optical path of the first laser chip 404a1, and transmitted to the first polarization state changing device 4053 along the transmission optical path of the first polarization beam splitter 4051, and then transmits out the first polarization state changing device 4053. A filter 4054. In this embodiment, the first polarization beam splitter 4051 combines the first polarization state changing device 4053 and the first filter 4054 to separate the transmission optical paths of the first wavelength signal light λ1 and the second wavelength light λ2, so that the second wavelength light λ2 does not transmit along the optical path of the first wavelength signal light λ1, so the second wavelength light λ2 will not enter the output optical path of the optical emitting sub-module, and thus the second wavelength light λ2 will not cause crosstalk to the second wavelength signal light λ2.

The second wavelength signal light λ2 is incident on the second polarization beam splitter 4055 along the output optical path of the second laser chip 404a2, and then transmitted to the second polarization state changing device 4056 along the transmission optical path of the second polarization beam splitter 4055, and then passes through the second polarization state changing device 4056. The polarization state changing device 4056 is transmitted to the second filter 4057; since the second filter 4057 is used to filter out the first wavelength light λ1, the second wavelength signal light λ2 is reflected back to the second polarization state changing device by the second filter 4057 4056, the second wavelength signal light λ2 is re-incident to the second polarization beam splitter 4055 through the second polarization state changing device again, and the second wavelength signal light λ2 is transmitted through the second polarization state changing device 4056 twice before and after compared to the first time. The polarization direction of the second wavelength signal light passing through the second polarization state changing device 4056 is rotated by 90°, that is, the polarization direction is perpendicular to the paper surface, and then the second wavelength signal light re-incident to the second polarization beam splitter 4055 along the second The reflected light path of the polarization beam splitter 4055 is transmitted and output. The first wavelength light λ1 is incident on the second polarization beam splitter 4055 along the output optical path of the second laser chip 404a2, and transmitted to the second polarization state changing device 4056 along the transmission optical path of the second polarization beam splitter 4055, and then transmits out the second polarization state changing device 4056. Second filter 4057. In this embodiment, the second polarization beam splitter 4055 combines the second polarization state changing device 4056 and the second filter 4057 to realize the separation of the transmission of the second wavelength signal light λ2 and the first wavelength light λ1, so that the first wavelength light λ1 It does not transmit along the optical path of the second wavelength signal light λ2, so the first wavelength light λ1 will not enter the output optical path of the light emitting sub-module, and thus the first wavelength light λ1 will not cause crosstalk to the first wavelength signal light λ1.

In some embodiments of the present disclosure, as shown in FIG. 8 , the first polarization beam splitter 4051 includes a second polarizer 0511 and a second polarization beam splitter prism 0512; a first polarization state changing device 4053 and a first filter 4054 are sequentially arranged on the transmitted light path of the second polarizer 0511; The first wavelength signal light λ1 and the second wavelength light λ2 are incident on the second polarizer 0511 along the output optical path of the first laser chip 404a1, since the polarization directions of the first wavelength signal light λ1 and the second wavelength light λ2 are parallel to the paper surface , and then transmitted to the first wavelength signal light λ1 and the second wavelength light λ2 on the polarization beam splitting dielectric film of the second polarizer 0511 through the polarization beam splitting dielectric film; reflected by the first filter 4054 again and transmitted through the first Since the polarization direction of the first wavelength signal light λ1 of the polarization state changing device 4053 has changed, and the polarization direction is perpendicular to the paper surface, when it is transmitted to the polarization beam splitting dielectric film of the second polarizer 0511 again, it will be blocked by the second polarizer. The polarizing beam splitting dielectric film of 0511 is reflected and transmitted to the second polarizing beam splitting prism 0512; when transmitted to the polarizing beam splitting dielectric film of the second polarizing beam splitting prism 0512, since the polarization direction is perpendicular to the paper surface, the first wavelength signal light λ1 will be reflected by the polarizing beam splitting dielectric film of the second polarizing beam splitting prism 0512, and then transmitted to the third polarization state changing device 4052;

A first reflective surface 0512A can also be set between the second polarizer and the first polarizer to replace the polarizing beam splitting dielectric film, which can reflect the light of the second polarizer toward the first polarizer; When three polarization state changing devices exist, the first reflective surface may be disposed between the second polarizer and the third polarization state changing device, or between the first polarizer and the third polarization state changing device between devices.

In some embodiments of the present disclosure, as shown in FIG. 8 , the second polarization beam splitter 4055 includes a third polarizer 0551; the second polarization state changing device 4056 and the second filter 4057 are sequentially arranged on the third polarizer 0551 on the transmitted light path; the first polarizer 0552 is arranged on the output light path of the third polarization state changing device 4052. The second wavelength signal light λ2 and the first wavelength light λ1 are incident on the third polarizer 0551 along the output optical path of the second laser chip 404a2, since the polarization directions of the second wavelength signal light λ2 and the first wavelength light λ1 are both parallel to the paper surface , and then transmitted to the second wavelength signal light λ2 and the first wavelength light λ1 on the polarization beam splitting dielectric film of the third polarizer 0551 through the polarization beam splitting dielectric film; reflected by the second filter 4056 and transmitted through the second The second wavelength signal light λ2 of the polarization state changing device 4056 has been changed due to the polarization direction, and the polarization direction is perpendicular to the paper surface. The polarizing beam splitting dielectric film of 0551 is reflected and transmitted to the first polarizer 0552; when transmitted to the polarizing beam splitting dielectric film of the first polarizer 0552, since the polarization direction is perpendicular to the paper surface, the second wavelength signal light λ2 will be transmitted by the first polarizer 0552. The polarizing beam splitting dielectric film of a polarizer 0552 is reflected, and then output from the first polarizer 0552. And the polarization direction of the first wavelength signal light λ1 transmitted by the third polarization state changing device 4052 is deflected by 90°, and the polarization direction is perpendicular to the paper. On the beam dielectric film, through the polarization beam splitting dielectric film, and then output from the first polarizer 0552. Finally, the first wavelength signal light λ1 and the second wavelength signal light λ2 are combined, and the second wavelength light λ2 and the first wavelength light λ1 will not be doped, so as not to cause the first wavelength signal light λ1 and the second wavelength signal light λ2 is cross-talked by the first wavelength light λ1 and the second wavelength light λ2.

Furthermore, in some embodiments of the present disclosure, as shown in FIG. 8 , the light emission sub-module 400 provided by the embodiments of the present disclosure further includes a Faraday rotator 4058 . The Faraday rotator 4057 is arranged at the output end of the reflected light path of the second polarization beam splitter 4055, and the Faraday rotator 4058 has the function of optical isolation. In some embodiments of the present disclosure, when the polarization directions of the first wavelength signal light λ1 and the second wavelength signal light λ2 are changed after passing through the Faraday rotator 4057 and are reflected back to the Faraday rotator 4057, the first wavelength signal light The polarization directions of the light λ1 and the second wavelength signal light λ2 will be changed again to effectively prevent the first wavelength signal light λ1 from returning to the first laser chip 404a1 and the second wavelength signal light λ2 returning to the second laser chip in the same way. 404a2.

In the light emitting sub-module provided by the embodiment shown in FIG. 8 , the positions of the first laser chip 404a1 and the second laser chip 404a2 are only an example, and the positions of the first laser chip 404a1 and the second laser chip 404a2 are not limited to those shown in the figure. The structure shown in 8 can also be transformed into other forms or structures.

FIG. 9 is a schematic structural diagram of another light emitting sub-module according to some embodiments. The same as the light emitting sub-module provided by the embodiment shown in FIG. 8 , in the embodiment shown in FIG. 9 , the first laser chip 404a1 and the second laser chip 404a2 of the light emitting sub-module further include a beam splitting component 405 and a first filter. 4054 and a second filter 4057.

In this embodiment, the beam splitting component 405 includes a first polarization beam splitter 4051, a third polarization state changing device 4052, a first polarization state changing device 4053, a second polarization beam splitter 4055 and a second polarization state changing device 4056, the third polarization state changing device 4052, the first polarization state changing device 4053, and the second polarization state changing device 4056 are used as a multiplexing component. In some embodiments of the present disclosure: the first polarization beam splitter 4051 is arranged on the output optical path of the first laser chip 404a1; the first polarization state changing device 4053 and the first filter 4054 are arranged in sequence on the first polarization The transmission light path of the beam splitter 4051; the third polarization state changing device 4052 is arranged on the output light path of the second laser chip 404a2; the second polarization beam splitter 4055 is arranged on the output light path of the third polarization state changing device 4052, and The second polarization beam splitter 4055 is arranged on the reflected light path of the first polarization beam splitter 4051 ; the second polarization state changing device 4056 and the second filter 4057 are sequentially arranged on the reflected light path of the first polarization beam splitter 4051 .

As shown in FIG. 9 , the first wavelength signal light λ1 is incident on the first polarization beam splitter 4051 along the output optical path of the first laser chip 404a1 , passes through the first polarization beam splitter 4051 , and then passes along the first polarization beam splitter 4051 The transmitted light path is transmitted to the first polarization state changing device 4053, and then transmitted to the first filter 4054 through the first polarization state changing device 4053; since the first filter 4054 is used to filter out the second wavelength light λ2, the first wavelength signal The light λ1 is reflected back to the first polarization state changing device 4053 by the first filter 4054, the first wavelength signal light λ1 passes through the first polarization state changing device 4053 again and is re-incident to the first polarization beam splitter 4051, and the first wavelength signal light λ1 Compared with the first wavelength signal light passing through the first polarization state changing device 4053 twice before and after, its polarization direction is rotated by 90°, that is, the polarization direction is perpendicular to the paper surface, and then re-incident to the first wavelength signal light. The first wavelength signal light λ1 of the first polarization beam splitter 4051 will be transmitted along the reflection light path of the first polarization beam splitter 4051 , and will be transmitted and output along the reflection light path of the first polarization beam splitter 4051 . The second wavelength light λ2 is incident on the first polarization beam splitter 4051 along the output optical path of the first laser chip 404a1, and transmitted to the first polarization state changing device 4053 along the transmission optical path of the first polarization beam splitter 4051, and then transmits out the first polarization state changing device 4053. A filter 4054. In this embodiment, the first polarization beam splitter 4051 combines the first polarization state changing device 4053 and the first filter 4054 to separate the transmission optical paths of the first wavelength signal light λ1 and the second wavelength light λ2, so that the second wavelength light λ2 does not transmit along the optical path of the first wavelength signal light λ1, so the second wavelength light λ2 will not enter the output optical path of the optical emitting sub-module, and thus the second wavelength light λ2 will not cause crosstalk to the second wavelength signal light λ2.

The second wavelength signal light λ2 is incident on the third polarization state changing device 4052 along the output optical path of the second laser chip 404a2, and the second wavelength signal light λ2 passes through the third polarization state changing device 4052 to change the polarization direction by 90°, that is, the second wavelength The signal light λ2 passes through the third polarization state changing device 4052 and the polarization direction is converted to be perpendicular to the paper surface; the second wavelength signal light λ2 passing through the third polarization state changing device 4052 is incident on the second polarization beam splitter 4055 and along the second polarization beam splitter 4055. The reflected light path of the polarization beam splitter 4055 is transmitted to the second polarization state changing device 4056, and then transmitted to the second filter 4057 through the second polarization state changing device 4056; since the second filter 4057 is used to filter out the first wavelength light λ1, Therefore, the second wavelength signal light λ2 is reflected back to the second polarization state changing device 4056 by the second filter 4057, and the second wavelength signal light λ2 passes through the second polarization state changing device again and is re-incident to the second polarization beam splitter 4055, before and after 2 Compared with the second wavelength signal light passing through the second polarization state changing device 4056 twice, the polarization direction of the second wavelength signal light passing through the second polarization state changing device 4056 for the first time is rotated by 90°, that is, the polarization direction is perpendicular to the paper. Then the second wavelength signal light re-incident to the second polarization beam splitter 4055 is transmitted along the transmission light path of the second polarization beam splitter 4055 and transmitted to the first polarization beam splitter 4051, and finally along the first polarization beam splitter 4051 reflected light path output. The first wavelength light λ1 is incident on the third polarization state changing device 4052 along the output optical path of the second laser chip 404a2, and the first wavelength light λ1 passes through the third polarization state changing device 4052 to change the polarization direction by 90°, that is, the first wavelength light λ1 passes through the third polarization state changing device 4052 and the polarization direction is converted to be perpendicular to the paper surface; the first wavelength light λ1 passing through the third polarization state changing device 4052 is incident on the second polarization beam splitter 4055 and splits along the second polarization The reflected light path of the filter 4055 is transmitted to the second polarization state changing device 4056 , transmitted to the second filter 4057 through the second polarization state changing device 4056 , and then transmitted out of the second filter 4057 . In some embodiments, the second polarization beam splitter 4055 combines the third polarization state changing device 4052, the second polarization state changing device 4056, the second filter 4057 and the first polarization beam splitter 4051 to realize the second wavelength signal light λ2 It is separated from the transmission of the first wavelength light λ1, so that the first wavelength light λ1 does not transmit along the optical path of the second wavelength signal light λ2, so the first wavelength light λ1 will not enter the output optical path of the optical emission sub-module, and then the first wavelength light λ1. The light λ1 does not cause crosstalk to the first wavelength signal light λ1.

In some embodiments of the present disclosure, as shown in FIG. 9 , the second polarizer 0511 and the reflecting prism 0513 ; the first polarization state changing device 4053 and the first filter 4054 are sequentially arranged on the transmitted light of the second polarizer 0511 On the road; the reflective prism 0513 is arranged on the reflected light path of the second polarizer 0511. The first wavelength signal light λ1 and the second wavelength light λ2 are incident on the second polarizer 0511 along the output optical path of the first laser chip 404a1, since the polarization directions of the first wavelength signal light λ1 and the second wavelength light λ2 are parallel to the paper surface , and then transmitted to the first wavelength signal light λ1 and the second wavelength light λ2 on the polarization beam splitting dielectric film of the second polarizer 0511 through the polarization beam splitting dielectric film; reflected by the first filter 4054 again and transmitted through the first Since the polarization direction of the first wavelength signal light λ1 of the polarization state changing device 4053 has changed, and the polarization direction is perpendicular to the paper surface, when it is transmitted to the polarization beam splitting dielectric film of the second polarizer 0511 again, it will be blocked by the second polarizer. The polarization beam splitting dielectric film of 0511 is reflected and transmitted to the reflective prism 0513; when the first wavelength signal light λ1 is transmitted to the reflective film of the reflective prism 0513, it will be reflected and output by the reflective film of the reflective prism 0513.

In some embodiments of the present disclosure, as shown in FIG. 9 , the second polarization beam splitter 4055 includes a third polarizer 0551; On the reflected light path of the polarization beam splitter 4051 ; the second polarization state changing device 4056 and the second filter 4057 are sequentially arranged on the reflected light path of the third polarizer 0551 . The second wavelength signal light λ2 and the first wavelength light λ1 are incident on the third polarization state changing device 4052 along the output optical path of the second laser chip 404a2, and the third polarization state changing device 4052 changes the polarization direction and then enters the third polarizer 0551 , since the polarization directions of the second wavelength signal light λ2 and the first wavelength light λ1 are both perpendicular to the paper surface, the second wavelength signal light λ2 and the first wavelength light are transmitted to the second wavelength signal light λ2 and the first wavelength light on the polarization beam splitting dielectric film of the third polarizer 0551. λ1 is reflected on the polarization beam splitting dielectric film of the third polarizer 0551, reflected by the second filter 4056 and transmitted through the second polarization state changing device 4056 again. Parallel to the paper, when transmitted to the polarizing beam splitting dielectric film of the third polarizer 0551 again, it will transmit the polarizing beam splitting dielectric film of the third polarizer 0551 to the second polarizer 0511, and then transmit the second polarizer The polarizing beam splitting dielectric film of the sheet 0511 is transmitted to the reflective prism 0513; when the second wavelength signal light λ2 is transmitted to the reflective film of the reflective prism 0513, it will be reflected and output by the reflective film of the reflective prism 0513. Finally, the first wavelength signal light λ1 and the second wavelength signal light λ2 are combined, and the second wavelength light λ2 and the first wavelength light λ1 will not be doped, so as not to cause the first wavelength signal light λ1 and the second wavelength signal light λ2 is cross-talked by the first wavelength light λ1 and the second wavelength light λ2.

Furthermore, in some embodiments of the present disclosure, as shown in FIG. 9 , the light emitting sub-module 400 provided by the embodiments of the present disclosure further includes a Faraday rotator 4058 . The Faraday rotator 4057 is arranged at the output end of the reflected light path of the second polarization beam splitter 4055, and the Faraday rotator 4058 has the function of optical isolation.

In the light emitting sub-module provided by the embodiment shown in FIG. 9 , the positions of the first laser chip 404a1 and the second laser chip 404a2 are only an example, and the positions of the first laser chip 404a1 and the second laser chip 404a2 are not limited to those shown in the figure. The structure shown in 8 can also be transformed into other forms or structures. For example, the positions of the first laser chip 404a1 and the second laser chip 404a2 are exchanged.

In the optical module provided by the embodiment of the present disclosure, the second wavelength light generated by the first laser chip 404a1 when turned off and on is leaked through the first filter and will not generate the second wavelength signal light generated when the second laser chip 404a2 is operating Crosstalk, when the corresponding second laser chip 404a2 is turned off and turned on, the first wavelength light is leaked out through the second filter and will not cause crosstalk to the first wavelength signal light when the first laser chip 404a1 is working, thereby avoiding light When the laser chips in the module are turned on or off, chirp crosstalk occurs between the laser chips. And when the number of laser chips in the optical module is more, adjusting the structure of the beam splitting component and the position and number of narrow-band filters can effectively generate chirp crosstalk between the laser chips.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present disclosure, but not to limit them; although the present disclosure has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still be Modifications are made to the technical solutions described in the foregoing embodiments, or some technical features thereof are equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions depart from the spirit and scope of the technical solutions of the embodiments of the present disclosure.

Claims

An optical module, characterized in that it includes

circuit board;

a first laser chip, electrically connected to the circuit board, configured to emit light of the first wavelength and the second wavelength;

a first filter, configured to receive the light emitted by the first laser chip, reflect the light of the first wavelength, and transmit the light of the second wavelength;

a second laser chip, electrically connected to the circuit board, configured to emit light of the first wavelength and the second wavelength;

a second filter, configured to receive the light emitted by the second laser chip, reflect the light of the second wavelength, and transmit the light of the first wavelength;

a multiplexing component configured to receive light of a first wavelength reflected from the first filter, receive light of a second wavelength reflected from the second filter, and combine the received light of the first wavelength and the light of the second wavelength are combined into one beam.
The optical module according to claim 1, characterized in that comprising:

a first polarization state changing device, capable of receiving light of a first wavelength reflected from the first filter, and changing the light of the first wavelength to a first polarization state;

a second polarization state changing device, capable of receiving the light of the second wavelength reflected from the second filter, and changing the light of the second wavelength to the second polarization state;

A multiplexing component, including a first polarizer, one side of the first polarizer can receive light with a first wavelength and a first polarization state; the other side of the first polarizer can receive a second wavelength and a second polarization state The first polarizer can transmit the light of the first polarization state, and can reflect the light of the second polarization state, so as to realize the light of the first wavelength and the light of the second wavelength.
The optical module according to claim 2, characterized in that comprising:

a second polarizer, arranged between the first laser chip and the first polarization state changing device, capable of transmitting light emitted by the first laser chip and reflecting light of a first wavelength and a first polarization state;

a third polarizer, disposed between the second laser chip and the second polarization state changing device, capable of transmitting the light emitted by the second laser chip and reflecting light of the second wavelength and the second polarization state;

The first reflection surface is disposed between the second polarizer and the first polarizer, and can reflect the light of the second polarizer toward the first polarizer.
The optical module according to claim 1, characterized in that comprising:

a first polarization state changing device, capable of receiving light of a first wavelength reflected from the first filter, and changing the light of the first wavelength to a second polarization state;

a second polarization state changing device, capable of receiving the light of the second wavelength reflected from the second filter, and changing the light of the second wavelength to the second polarization state;

The third polarization state changing device can change the light of the first wavelength and the second polarization state to the first polarization state;

A multiplexing component, including a first polarizer, one side of the first polarizer can receive light with a first wavelength and a first polarization state; the other side of the first polarizer can receive a second wavelength and a second polarization state The first polarizer can transmit the light of the first polarization state, and can reflect the light of the second polarization state, so as to realize the light of the first wavelength and the light of the second wavelength.
The optical module according to claim 4, characterized in that comprising:

a second polarizer, arranged between the first laser chip and the first polarization state changing device, capable of transmitting light emitted by the first laser chip and reflecting light of a first wavelength and a first polarization state;

a third polarizer, disposed between the second laser chip and the second polarization state changing device, capable of transmitting the light emitted by the second laser chip and reflecting light of the second wavelength and the second polarization state;

a third polarization state changing device, disposed between the first polarizer and the second polarizer;

a first reflective surface, arranged between the second polarizer and the third polarization state changing device, or between the first polarizing plate and the third polarization state changing device; The light of the polarizer is reflected toward the first polarizer.
An optical module, characterized in that it includes:

circuit board;

a light emitting sub-module, electrically connected to the circuit board, for outputting signal light;

Wherein, the light emission sub-module includes:

a first laser chip for generating signal light of a first wavelength, and the first laser chip generates light of a second wavelength when turned off and on;

a first polarization beam splitter, arranged on the output optical path of the first laser chip, and configured to transmit the first wavelength signal light according to the polarization state of the first wavelength signal light and the polarization state of the second wavelength light and said second wavelength light;

A first polarization state conversion device and a first narrow-band filter are sequentially arranged on the transmission light path of the first polarization beam splitter, and the first narrow-band filter is used for transmitting the second wavelength light and for reflecting all the light. the first wavelength signal light, and the first polarization state conversion device is used to change the polarization state of the first wavelength signal light;

a polarization state conversion device, arranged on the reflected light path of the first polarization beam splitter, for transmitting the first wavelength signal light and changing the polarization state of the first wavelength signal light;

a second laser chip for generating signal light of a second wavelength, the second laser chip generating light of the first wavelength when turned off and on;

A second polarization beam splitter, which is arranged on the output optical path of the second laser chip, and is used for the signal light of the first wavelength, the signal light of the second wavelength and the first wavelength of the signal light. The polarization state optical splitting path of one wavelength light transmits the first wavelength signal light, the second wavelength signal light and the first wavelength light;

A second polarization state conversion device and a second narrow-band filter are sequentially arranged on the transmission light path of the second polarization beam splitter, and the second narrow-band filter is used to transmit the first wavelength light and to reflect the light of all wavelengths. the second wavelength signal light, and the second polarization state conversion device is used to adjust the polarization state of the second wavelength signal light.
The optical module according to claim 6, wherein the first polarization beam splitter comprises:

a first polarization beam splitter prism, wherein the transmission light path of the first polarization beam splitter prism is sequentially arranged on the first polarization state conversion device and the first narrow-band filter;

The second polarizing beam splitting prism is arranged on the reflected light path of the first polarizing beam splitting prism, and the polarization state conversion device is arranged on the reflected light path of the second polarizing beam splitting prism.
The optical module according to claim 6, wherein the second polarization beam splitter comprises:

a third polarization beam splitter prism, the transmission light path of the third polarization beam splitter prism is sequentially arranged on the second polarization state conversion device and the second narrowband filter;

The fourth polarizing beam splitting prism is arranged on the reflected light path of the third polarizing beam splitting prism, and the fourth polarizing beam splitting prism is arranged on the output light path of the polarization state conversion device.
The optical module according to claim 6, wherein the optical emission sub-module further comprises:

The Faraday rotator is arranged at the output end of the reflected light path of the second polarization beam splitter.
An optical module, characterized in that it includes:

circuit board;

a light emitting sub-module, electrically connected to the circuit board, for outputting signal light;

Wherein, the light emission sub-module includes:

a first laser chip for generating signal light with a first wavelength, the first laser chip generating light with a second wavelength when turned off and on;

a first polarization beam splitter, arranged on the output optical path of the first laser chip, for transmitting the first wavelength signal light according to the polarization state of the first wavelength signal light and the polarization state of the second wavelength light and the second wavelength light;

A first polarization state conversion device and a first narrow-band filter are sequentially arranged on the transmission light path of the first polarization beam splitter, and the first narrow-band filter is used to transmit the second wavelength light and to reflect the light of the second wavelength. the first wavelength signal light, and the first polarization state conversion device is used to change the polarization state of the first wavelength signal light;

a second laser chip for generating signal light of a second wavelength, the second laser chip generating light of the first wavelength when turned off and on;

a polarization state conversion device, arranged on the output optical path of the first laser chip, for changing the polarization state of the second wavelength signal light and the first wavelength light;

A second polarizing beam splitter is disposed on the output optical path of the polarization conversion device and on the reflected optical path of the first polarizing beam splitter, and is used to further combine the signal light of the second wavelength with the first polarization beam splitter. The polarization state optical splitting path of the wavelength light transmits the second wavelength signal light and the first wavelength light;

A second polarization state conversion device and a second narrow-band filter are sequentially arranged on the reflected light path of the second polarization beam splitter, and the second narrow-band filter is used to transmit the first wavelength light and to reflect the light of all wavelengths. the second wavelength signal light, and the second polarization state conversion device is used to change the polarization state of the second wavelength signal light.
The optical module according to claim 10, wherein the first polarization beam splitter comprises:

a first polarization beam splitter prism, wherein the transmission light path of the first polarization beam splitter prism is sequentially arranged on the first polarization state conversion device and the first narrow-band filter;

The reflecting prism is arranged on the reflected light path of the first polarizing beam splitting prism.
The optical module according to claim 10, wherein the second polarization beam splitter comprises:

A third polarizing beam splitter prism is arranged on the output optical path of the polarization conversion device and on the reflected optical path of the first polarizing beam splitter, and the reflected optical paths of the third polarizing beam splitting prism are sequentially arranged on the A second polarization state conversion device and the second narrowband filter.
The optical module according to claim 10, wherein the optical emission sub-module further comprises:

The Faraday rotator is arranged at the output end of the reflected light path of the second polarization beam splitter.
An optical module, characterized in that it includes:

circuit board;

a light emitting sub-module, electrically connected to the circuit board, for outputting signal light;

Wherein, the light emission sub-module includes:

a first laser chip for generating signal light with a first wavelength, the first laser chip generating light with a second wavelength when turned off and on;

a second laser chip for generating signal light of a second wavelength, the second laser chip generating light of the first wavelength when turned off and on;

A polarization beam splitter assembly includes a first input end, a second input end, a polarization beam splitter, a polarization state conversion device, a first output end, a second output end and a third output end, the first input end being optically connected to the The first laser chip, the polarization conversion device and the polarization beam splitter are combined for the first wavelength signal light and the second wavelength light and the second wavelength signal light and the first wavelength Separation of optical transmission paths, so that the first output end is used to output the first wavelength signal light and the second wavelength signal light;

a first narrow-band filter, arranged on the output optical path of the second output end, for transmitting the second wavelength light and for reflecting the first wavelength signal light;

The second narrow-band filter is arranged on the output optical path of the third output end, and is used for transmitting the light of the first wavelength and for reflecting the signal light of the second wavelength.
The optical module according to claim 14, wherein the optical emission sub-module further comprises:

The Faraday rotator is arranged on the output optical path of the first output end.