Optical transmitting assembly, optical transceiver and optical line terminal

Abstract

The embodiment of the invention provides a light emitting assembly, a light receiving and transmitting device and an optical line terminal.The light emitting assembly comprises a plurality of light emitters, a plurality of wave plates, an isolator and a polarization beam combiner, the light emitters are used for outputting multiple paths of emergent light signals with different wavelengths, and the wave plates are used for outputting multiple paths of emergent light signals with different wavelengths; the plurality of wave plates are respectively used for deflecting the corresponding emergent light signals into a preset polarization direction and then outputting the emergent light signals to the polarization beam combiner, so that the polarization beam combiner combines the emergent light signals with different wavelengths, thereby outputting multi-wavelength coupling light signals; the isolator is used for blocking an external light signal, preventing the external light signal from being reflected to the light emitter, preventing external incident light from influencing the stability of an emergent light signal, and reducing light energy loss. According to the embodiment of the invention, the isolation index of the optical emission assembly can be effectively ensured, the insertion loss is reduced, the packaging size of the multi-mode coexisting optical emission assembly can be effectively reduced, and favorable support is provided for miniaturization of the optical line terminal.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to an optical transmitting component, an optical transceiver and an optical line terminal. Background Art

[0002] Passive optical network (PON) technology is a point-to-multipoint fiber access technology. PON mainly includes an optical line terminal (OLT) located at the central office, an optical distribution network (ODN) and at least one optical network unit (ONU) or at least one optical network terminal (ONT) located at the user end. ODN provides an optical transmission channel between OLT and ONU. ODN includes passive devices such as optical fiber and passive optical splitters (Splitter).

[0003] With the development of various services, users have an increasing demand for bandwidth, and the PON system is constantly upgrading from Gigabit-capable Passive Optical Network (GPON) to 10 Gigabit-capable Passive Optical Network (10G-PON, also known as XG-PON), and then to 50 Gigabit-capable Passive Optical Network (50G-PON). In order to achieve a smooth upgrade of PON, multiple modes of PON need to coexist, for example, GPON, XG(S)-PON and 50G-PON. For the transmitter on the OLT side, it is necessary to integrate multiple laser transmitters of different wavelengths. How to reduce the package size of the multi-mode transmitter and reduce the loss of optical energy is a technical problem that needs to be solved at present. Summary of the invention

[0004] The embodiments of the present application provide an optical transmission component, an optical transceiver, and an optical line terminal, which can effectively reduce the packaging size and optical energy loss of a multi-mode optical transmission component.

[0005] In a first aspect, the present application provides an optical transmission component, comprising a plurality of optical transmitters, a plurality of wave plates, an isolator and a polarization beam combiner, wherein:

[0006] The multiple optical transmitters are used to output multiple outgoing optical signals of different wavelengths, wherein each of the optical transmitters outputs one outgoing optical signal correspondingly;

[0007] Each of the wave plates corresponds to one of the outgoing light signals, and is used to deflect the corresponding outgoing light signal into a preset polarization direction and then output it to the polarization beam combiner;

[0008] The polarization beam combiner is used to combine the outgoing optical signals output by each of the wave plates to output a multi-wavelength coupled optical signal;

[0009] The isolator is used to prevent external optical signals from being reflected to the optical transmitter.

[0010] In a second aspect, the present application provides an optical transceiver device, comprising: the optical transmitting component, the optical receiving component and the optical transceiver branching component as described in the first aspect above; wherein,

[0011] The transceiver branching component is used to transmit the coupled optical signal output by the optical transmitting component to an external network, and to transmit the first incident optical signal input by the external network to the optical receiving component.

[0012] In a third aspect, the present application provides an optical line terminal, comprising the optical transceiver device as described in the second aspect above.

[0013] In the embodiment of the present application, the optical transmission component includes multiple optical transmitters, multiple wave plates, isolators and polarization combiners, wherein the multiple optical transmitters are used to output outgoing optical signals of different wavelengths respectively, each wave plate corresponds to one outgoing optical signal respectively, and is used to deflect the corresponding outgoing optical signal into a preset polarization direction and then output it to the polarization combiner, so that the polarization combiner combines the outgoing optical signals of different wavelengths, thereby outputting a multi-wavelength coupled optical signal; the isolator is used to block external optical signals, avoid the external optical signal from reflecting to the optical transmitter, avoid the external incident light from affecting the stability of the outgoing optical signal, and reduce the optical energy loss. According to the embodiment of the present application, the isolation index of the optical transmission component can be effectively guaranteed, the insertion loss can be reduced, and the performance index of the optical transmission component can be improved. At the same time, the packaging size of the optical transmission component with multiple modes can be effectively reduced, providing favorable support for the miniaturization of optical line terminals. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic diagram of an exemplary structure of a light emitting component provided in an embodiment of the present application;

[0015] Figure 2 is a schematic diagram of an exemplary structure of an isolator provided in an embodiment of the present application;

[0016] Figure 3is a schematic diagram of an exemplary structure of a polarization beam combiner provided in an embodiment of the present application;

[0017] Figure 4 is an exemplary structural diagram of another optical transmission component provided in an embodiment of the present application;

[0018] Figure 5 is an exemplary structural diagram of another optical transmission component provided in an embodiment of the present application;

[0019] Figure 6 is an exemplary structural diagram of another optical transmission component provided in an embodiment of the present application;

[0020] Figure 7 is a schematic diagram of an exemplary structure of an optical transceiver provided in an embodiment of the present application;

[0021] Figure 8 is a schematic diagram of an exemplary structure of an optical transceiver provided in an embodiment of the present application;

[0022] Figure 9a and Figure 9b is a schematic diagram of an exemplary structure of a light receiving component provided in an embodiment of the present application;

[0023] Fig.10 It is a schematic diagram of an exemplary structure of an optical transceiver provided in an embodiment of the present application.

[0024] Reference numerals

[0025] 100 optical transmission component; 111, 112, 113 optical transmitters; 121, 122, 123 wave plates;

[0026] 130 isolator; 131, 132, 133 isolation channels;

[0027] 1301 polarizer; 1302 Faraday rotator; 1303 analyzer;

[0028] 140 polarization beam combiner; 150 first packaging shell; 160 first optical port;

[0029] 170 circuit board; 181 refrigerator; 182 thermistor; 183 collimating lens; 184 heat sink; 185 emitter substrate;

[0030] 200: light receiving component; 211, 212, 213: light receiving detectors;

[0031] 221, 222, 223 reflectors;

[0032] 231, 232, 233, 234, 235, 236, 237 filters;

[0033] 241, 242, 243, 244 converging lenses;

[0034] 251 a second optical port; 252 a third optical port;

[0035] 260 second packaging shell; 270 optical substrate;

[0036] 300 optical transceiver splitter components; 400 optical fiber adapters. DETAILED DESCRIPTION

[0037] In order to enable those skilled in the art to better understand the technical solution of the present application, the optical transmitting assembly, optical transceiver device and optical line terminal provided by the present application are described in detail below in conjunction with the accompanying drawings.

[0038] Hereinafter, example embodiments will be described more fully in conjunction with the accompanying drawings, but the described example embodiments may be embodied in different forms and should not be construed as being limited to the embodiments set forth herein. On the contrary, the purpose of providing these embodiments is to make this application thorough and complete, and will enable those skilled in the art to fully understand the scope of this application.

[0039] As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0040] The terms used herein are only used to describe specific embodiments and are not intended to limit the present application. As used herein, the singular forms "a", "an" and "the" are also intended to include the plural forms, unless the context clearly indicates otherwise. It will also be understood that when the terms "comprising" and / or "made of" are used in this specification, the presence of features, wholes, steps, operations, elements and / or components is specified, but the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or groups thereof is not excluded.

[0041] In the embodiments of the present application, "at least one" refers to one or more, and "more than one" refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent the existence of A alone, the existence of A and B at the same time, and the existence of B alone. Among them, A and B can be singular or plural. The character " / " generally indicates that the objects associated before and after are in an "or" relationship. "At least one of the following" and similar expressions refer to any combination of these items, including any combination of singular or plural items. For example, at least one of a, b and c can mean: a exists alone, b exists alone, c exists alone, a and b exist at the same time, a and c exist at the same time, b and c exist at the same time, or a, b and c exist at the same time, wherein a, b, c can be single or multiple.

[0042] In the description of the present application, the terms "inside", "outside", "longitudinal", "lateral", "upper", "lower", "top", "bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and do not require that the present application must be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present application. A person of ordinary skill in the art should be aware that the connection described in the embodiments of the present application includes a direct connection and an indirect connection connected through an intermediate component.

[0043] In addition, the technical features involved in each embodiment of the present application described below can be combined with each other as long as they do not conflict with each other.

[0044] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as those commonly understood by those of ordinary skill in the art. It will also be understood that terms such as those defined in common dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and the present application, and will not be interpreted as having an idealized or excessive formal meaning, unless clearly defined in the present application examples.

[0045] In order to facilitate understanding of the solutions of the embodiments of the present application and to provide a clear and concise description of the following embodiments, a brief introduction to the related technologies is first given:

[0046] Passive Optical Network (PON): Passive optical network refers to an optical distribution network (ODN) between the optical line terminal (OLT) and the optical network unit (ONU), without any active electronic devices. One end of the OLT is connected to the upper network to complete the upstream access of the PON. The upper network can be an Internet protocol (IP) backbone network or a public switched telephone network (PSTN). The other end of the OLT is connected to the user-end device through the ODN to complete the downstream transmission of the PON and realize the control, management and ranging functions of the user-end device. The user-end device can be an ONU or ONT. One end of the user-end device is connected to the OLT through the ODN, and the other end of the user-end device is connected to other terminal devices, such as computers, landlines, etc. ONU works with OLT to realize Ethernet layer 2 and layer 3 functions and provide users with voice, data and multimedia services. For example, the ONU can select and receive data sent by the OLT; respond to management commands issued by the OLT and make corresponding adjustments; cache the user's Ethernet data and send it to the uplink in the sending window allocated by the OLT; and perform other user management functions.

[0047] The mode of PON can also be called the working mode of PON. In practical applications, the mode control signal can be used to control each device included in PON to work in the corresponding mode. It can be understood that the mode includes an upstream rate, a downstream rate, an upstream wavelength, and a downstream wavelength. The so-called upstream refers to from ONT to OLT, and the upstream can also be called an uplink or an upstream optical path. The so-called downstream refers to from OLT to ONT, and the downstream can also be called a downlink or a downstream optical path.

[0048] The embodiments of the present application are applicable to compatibility between multiple PON operating modes. Exemplarily, the PON working mode specifically includes: next-generation PON (NG-PON), NG-PON1, NG-PON2, gigabit PON (GPON), 10 gigabit per second PON (XG-PON), 10-gigabit-capable symmetric passive optical network (XGS-PON), Ethernet PON (EPON), 10 gigabit per second EPON (10G-EPON), next-generation EPON (NG-EPON), wavelength-division multiplexing (WDM) PON, time-and wavelength-division multiplexing (TWDM) PON, point-to-point (P2P) WDM PON (P2P-WDM The present invention relates to GPON, APN, EPON, 25 Gigabit per second PON (25G-PON), 50 Gigabit per second PON (50G-PON), 100 Gigabit per second PON (100G-PON), 25 Gigabit per second EPON (25G-EPON), 50 Gigabit per second EPON (50G-EPON), 100 Gigabit per second EPON (100G-EPON), and GPON, EPON of other rates.

[0049] Wavelength division multiplexing (WDM): Wavelength division multiplexing is a technology that combines two or more optical carrier signals of different wavelengths (carrying various information) at the transmitting end through a multiplexer (also called a combiner) and couples them to the same optical fiber of the optical line for transmission; at the receiving end, the optical carriers of various wavelengths are separated by a demultiplexer (also called a splitter or demultiplexer), and then further processed by the optical receiver to restore the original signal. This technology of simultaneously transmitting two or more optical signals of different wavelengths in the same optical fiber is called wavelength division multiplexing.

[0050] Transistor-Outline can (TOCAN) package: Transistor-Outline can package. Most early transistors used coaxial packaging, which was later borrowed to optical communications and called TO packaging, i.e. coaxial packaging.

[0051] BOX package: a butterfly package used for multi-channel parallel packaging.

[0052] Currently, the PONs deployed on a large scale include GPON and 10G-PON (XG(S)-PON). In order to solve the coexistence problem of GPON and 10G-PON, OLT can combine and multiplex the upstream and downstream wavelengths of GPON and 10G-GPON through a built-in wavelength division multiplexing (WDM) device (such as a combiner or splitter), so that the GPON optical module and the 10G-GPON optical module are combined into one to obtain a combo optical module.

[0053] With the development of 50G-PON, it is recognized as the next generation PON technology after 10G-PON. In order to achieve a smooth upgrade to 50GPON, three-mode optical components and optical module products combining 50G-PON, 10G-PON and GPON are needed. This is equivalent to re-implementing the WDM multiplexing and demultiplexing with 50G-PON based on the current Qaud-OSA optical components of XG(S)PON&GPON, that is, it is equivalent to integrating a 50G laser and a 50G (25G) receiving detector on the current dual-mode optical module products, which means that the optical components need to integrate three optical transmitting components and three optical receiving components, a total of 6 optical components. The module solution also needs to integrate the corresponding electrical chips of 50G-PON, 10G-PON and GPON, which greatly increases the technical difficulty, process difficulty and cost of the optical components. The size and power consumption of the components and modules are also a technical issue that needs to be considered and solved. These factors are not conducive to the rapid large-scale commercial use of the 50G-PON series solutions.

[0054] In view of this, the embodiments of the present application provide an optical transmission component, an optical transceiver device and an optical line terminal, which can effectively reduce the packaging size and optical energy loss of the multi-mode optical transmission component.

[0055] The optical transmission component of the embodiment of the present application includes: multiple optical transmitters, multiple wave plates, an isolator and a polarization beam combiner (PBC), wherein the multiple optical transmitters are used to output multiple outgoing optical signals of different wavelengths, wherein each optical transmitter corresponds to one outgoing optical signal; each wave plate corresponds to one outgoing optical signal, and is used to deflect the corresponding outgoing optical signal into a preset polarization direction and then output it to the polarization beam combiner; the polarization beam combiner is used to combine the outgoing optical signals output by each wave plate to output a multi-wavelength coupled optical signal; the isolator is used to prevent external optical signals from reflecting to the optical transmitter.

[0056] See also Figure 1 , Figure 1 FIG. 1 is a schematic diagram of an exemplary structure of a light emitting component provided in an embodiment of the present application. Figure 1 As shown, the optical transmitting assembly 100 includes an optical transmitter 111, an optical transmitter 112, and an optical transmitter 113, wherein the optical transmitter 111 is used to output an outgoing optical signal of a first wavelength, the optical transmitter 112 is used to output an outgoing optical signal of a second wavelength, and the optical transmitter 113 is used to output an outgoing optical signal of a third wavelength. For ease of description, the outgoing optical signal of the first wavelength is referred to as a λt1 signal, the outgoing optical signal of the second wavelength is referred to as a λt2 signal, and the outgoing optical signal of the third wavelength is referred to as a λt3 signal, and the λt1 signal, the λt2 signal, and the λt3 signal are outgoing optical signals of different wavelengths, respectively.

[0057] Exemplarily, the optical transmitter 111 / 112 / 113 may be a laser chip, such as a passive patch type laser chip, which may generally be implemented using a laser diode (LD). The laser chip is used to convert an electrical signal into an optical signal, that is, to generate an optical signal according to an electrical signal. The laser chip here may be packaged in a BOX form.

[0058] For example, Figure 1The optical transmission assembly 100 shown includes a wave plate 121, a wave plate 122, and a wave plate 123, wherein the wave plate 121 is disposed on the light-emitting side of the corresponding optical transmitter 111, the wave plate 122 is disposed on the light-emitting side of the corresponding optical transmitter 112, and the wave plate 123 is disposed on the light-emitting side of the corresponding optical transmitter 113. The optical signal emitted from the optical transmitter 111 / 112 / 113 passes through the corresponding wave plate 121 / 122 / 123 to change the polarization direction through the corresponding wave plate 121 / 122 / 123, so that the polarization state of the emitted optical signal 111 / 112 / 113 can meet the incident polarization state requirement of the polarization combiner 140.

[0059] Exemplarily, the isolator 130 may be disposed on the light incident side of the polarization beam combiner 140 , and the isolator 130 includes a plurality of isolation channels, each of which corresponds to one of the outgoing optical signals. Figure 1 In the example, the isolator 130 includes isolation channels 131, 132, and 133, which are respectively used to prevent external optical signals from being reflected to the light-emitting end faces of the optical transmitter 111, the optical transmitter 112, and the optical transmitter 113, thereby ensuring the isolation index of the optical transmission component 100 and reducing the insertion loss of the output optical signal.

[0060] It should be noted that the wave plate 121 / 122 / 123 can be integrated into the corresponding isolation channel 131 / 132 / 133, or the wave plate 121 / 122 / 123 can be arranged outside the light incident side of the corresponding isolation channel 131 / 132 / 133, or the wave plate 121 / 122 / 123 can be arranged outside the light output side of the corresponding isolation channel 131 / 132 / 133.

[0061] See also Figure 2 , Figure 2 Schematic diagram of an exemplary structure of an isolator provided in an embodiment of the present application. Figure 2 As shown, each isolation channel 131 / 132 / 133 includes a polarizer 1301, a Faraday rotator 1302, and an analyzer 1303, and the polarizer 1301, the Faraday rotator 1302, and the analyzer 1303 are sequentially arranged along the optical path transmission direction. It should be noted that the analyzer 1303 in the isolation channel 131 / 132 / 133 is optional, that is, the analyzer 1303 in the isolation channel 131 / 132 / 133 can be eliminated, which can achieve the purpose of saving cost and reducing the package size.

[0062] Figure 1In the example, the isolation channels 131 / 132 / 133 are correspondingly arranged on the light incident side of the wave plates 121 / 122 / 123. The outgoing optical signals λt1 / λt2 / λt3 output by the optical transmitters 111 / 112 / 113 are first incident on the corresponding isolation channels 131 / 132 / 133, and the polarization direction is deflected by 45° by the Faraday rotator 1302 in the corresponding isolation channels 131 / 132 / 133. After the outgoing optical signals λt1 / λt2 / λt3 are emitted from the corresponding isolation channels 131 / 132 / 133, they are incident on the corresponding wave plates 121 / 122 / 123, and the polarization direction is deflected by the corresponding wave plates 121 / 122 / 123 to meet the incident polarization state requirements of the polarization beam combiner 140, and then incident on the polarization beam combiner 140.

[0063] It should be noted that the isolation channels 131 / 132 / 133 can also be correspondingly arranged on the light-emitting side of the wave plates 121 / 122 / 123. In this case, the outgoing optical signal λt1 / λt2 / λt3 output by the optical transmitter 111 / 112 / 113 is first incident on the corresponding wave plate 121 / 122 / 123, and the polarization direction is deflected to the angle of the preset deflection direction by the corresponding wave plate 121 / 122 / 123. After the outgoing optical signal λt1 / λt2 / λt3 is emitted from the wave plate 121 / 122 / 123, it is incident on the corresponding isolation channel 131 / 132 / 133, and the polarization direction is further deflected by 45° by the Faraday rotator 1302 in the isolation channel 131 / 132 / 133, so that the polarization state of the outgoing optical signal λt1 / λt2 / λt3 meets the incident polarization state requirement of the polarization combiner 140.

[0064] See also Figure 3 , Figure 3 is an exemplary structural diagram of a polarization beam combiner provided in an embodiment of the present application. Figure 3As shown, the polarization beam combiner 140 includes an S1 surface, an S2 surface, an S3 surface, an S4 surface, and an S5 surface, each of which is coated with an anti-reflection film or a reflective film in a corresponding polarization direction. Exemplarily, the λt1 signal is deflected into S polarized light through the corresponding isolation channel 131 and the wave plate 121, the λt2 signal is deflected into S polarized light through the corresponding isolation channel 132 and the wave plate 122, and the λt3 signal is deflected into P polarized light through the corresponding isolation channel 133 and the wave plate 123. The λt1 signal is emitted to the S5 surface of the wave plate, and is transmitted to the S1 surface through the S5 surface, reflected to the S2 surface through the S1 surface, and then transmitted to the S3 surface through the S2 surface, and then reflected to the S4 surface from the S3 surface; the λt2 signal is emitted to the S5 surface of the wave plate, and is transmitted to the S2 surface through the S5 surface, reflected to the S3 surface through the S2 surface, and then reflected to the S4 surface from the S3 surface; the λt3 signal is emitted to the S5 surface of the wave plate, and is transmitted to the S3 surface through the S5 surface. The S3 surface is configured to reflect S polarized light and transmit P polarized light, so λt3 can be directly transmitted from the S3 surface to the S4 surface. The S4 surface is coated with an anti-reflection film, so that the three optical signals of different wavelengths (λt1, λt2, λt3) can all be transmitted from the S4 surface, realizing the combination of the three optical signals of different wavelengths (λt1, λt2, λt3) into a multi-wavelength coupling signal. It should be noted that what is introduced here is only one form of the polarization beam combiner 140. The polarization beam combiner 140 can also be designed into other forms. For example, the three outgoing light signals (λt1, λt2, λt3) can be set to have corresponding polarization states of S polarized light, S polarized light, and P polarized light when arriving at the polarization beam combiner. The three outgoing light signals (λt1, λt2, λt3) can also be set to have corresponding polarization states of P polarized light, P polarized light, and S polarized light when arriving at the polarization beam combiner. Or they can be set to have other polarization states incident on the polarization beam combiner. When each outgoing light signal is incident in a different polarization state, the corresponding form of the polarization beam combiner 140 will also be different. In specific implementation, the form of the polarization beam combiner can be designed based on the comprehensive cost or performance requirements.

[0065] Figure 1 In the example, the optical transmission component 100 also includes a first packaging shell 150, multiple optical transmitters (111, 112, 113), multiple wave plates (121, 122, 123), an isolator 130 and a polarization combiner 140 are all arranged inside the first packaging shell 150, and the first packaging shell 150 is provided with a first optical port 160, and the coupled optical signal can be output to the outside of the first packaging shell 150 through the first optical port 160.

[0066] See also Figure 4 , Figure 4 It is a schematic diagram of an exemplary structure of another optical transmission component 100 provided in an embodiment of the present application. Figure 4In the example of FIG. 1 , the isolator 130 is disposed on the light-emitting side of the polarization beam combiner 140, and the isolator 130 includes an isolation channel corresponding to the coupled optical signal. Figure 4 As shown, the isolator 130 can be disposed at the first optical port 160, specifically, it can be disposed at the inner side of the first optical port 160, or it can be disposed at the outer side of the first optical port 160. It should be understood that the isolator 130 is disposed at the first optical port 160, which can also achieve the purpose of blocking the external optical signal from being reflected to the light-emitting end faces of the optical transmitters 111, 112, and 113.

[0067] See also Figure 2 and Figure 4 , the isolator 130 is arranged on the light output side of the polarization beam combiner 140, and includes an isolation channel 130 for coupling optical signals. The isolation channel includes a polarizer 1301, a Faraday rotator 1302 and an analyzer 1303, or includes a polarizer 1301 and a Faraday rotator 1302. The output optical signal λt1 / λt2 / λt3 output by the optical transmitter 111 / 112 / 113 is first incident on the corresponding wave plate 121 / 122 / 123, and the polarization direction of the output optical signal λt1 / λt2 / λt3 is deflected to meet the incident polarization state requirement of the polarization beam combiner 140 through the corresponding wave plate 121 / 122 / 123, and then enters the polarization beam combiner 140 to be combined with output optical signals of other wavelengths, and a multi-wavelength coupled optical signal output from the polarization beam combiner 140 is output through the isolation channel of the isolator 130.

[0068] See also Figure 5 , Figure 5 It is a schematic diagram of an exemplary structure of another optical transmission component 100 provided in an embodiment of the present application. Figure 5 In the example of FIG. 1 , the wave plates corresponding to the outgoing optical signals λt1 / λt2 / λt3 are integrated into the isolator 130. Specifically, the wave plates 121 / 122 / 123 are integrated into the corresponding isolation channels 131 / 132 / 133. This can improve the integration of the devices in the optical transmission component 100, thereby reducing the size of the optical transmission component 100. Figure 5 As shown, the isolator 130 is arranged on the light incident side of the polarization combiner 140, and the isolator 130 includes a plurality of isolation channels 131 / 132 / 133 corresponding to the output optical signals λt1 / λt2 / λt3 one by one, and each isolation channel is integrated with a corresponding wave plate (121 / 122 / 123).

[0069] In one example, the isolation channel 131 / 132 / 133 may include a polarizer 1301, a Faraday rotator 1302, an analyzer 1303 and a wave plate 121 / 122 / 123 arranged in sequence along the light path transmission direction; in another example, the isolation channel 131 / 132 / 13 may include a polarizer 1301, a Faraday rotator 1302 and a wave plate 121 / 122 / 123 arranged in sequence along the light path transmission direction; in yet another example, the isolation channel 131 / 132 / 133 may include a wave plate 121 / 122 / 123, a polarizer 1301 and a Faraday rotator 1302 arranged in sequence along the light path transmission direction; in yet another example, the isolation channel 131 / 132 / 133 may include a wave plate 121 / 122 / 123, a polarizer 1301, a Faraday rotator 1302 and an analyzer 1303 arranged in sequence along the light path transmission direction.

[0070] Exemplarily, the optical transmitter assembly 100 may also include a heat sink and an emitter substrate, the optical transmitter is disposed on the emitter substrate, and the emitter substrate is disposed on the heat sink. The emitter substrate is used to carry the optical transmitter and may also be used to adjust the center position of the optical axis of the optical transmitter. The heat sink is used to improve the heat dissipation performance of the optical transmitter.

[0071] Exemplarily, the light emitting component 100 may also include a refrigerator, and the light emitter is arranged on the refrigerator. The heat dissipation problem of the light emitter is solved by the refrigerator, so as to avoid the light emitter from affecting the working stability due to the heating problem. The refrigerator may specifically be a semiconductor refrigeration plate, and the semiconductor refrigeration plate may be connected to a circuit board, and the circuit board outputs a control signal for controlling the refrigeration of the semiconductor refrigeration plate. Furthermore, the light emitting component 100 may also include a thermistor, and the thermistor is used to collect the temperature parameters of the light emitting device. The temperature parameters collected by the thermistor are transmitted to the circuit board, and the circuit board outputs a control signal for controlling the refrigeration power of the semiconductor refrigeration plate according to the temperature parameters, thereby improving the accuracy of temperature regulation, so that the light emitter works in a stable ambient temperature.

[0072] For example, the heat sink may be disposed on the refrigerator, and the light emitter may be disposed on the heat sink via the emitter substrate. The operating temperature of the light emitter may be controlled by the refrigerator and the heat sink.

[0073] Exemplarily, the isolator 130 may be disposed on a refrigerator so that the isolator 130 operates in a stable ambient temperature, thereby preventing the isolation index and insertion loss index of the isolator 130 from being deteriorated due to changes in ambient temperature.

[0074] Exemplarily, the isolator 130 and the optical transmitter can be arranged on a refrigerator together. For example, the refrigerator is a semiconductor cooling plate, a heat sink is arranged on the semiconductor cooling plate, the isolator 130 and the optical transmitter are arranged on the heat sink together, and a thermistor is also arranged on the heat sink. The circuit board collects the ambient temperature in the optical transmission component 100 through the thermistor, and outputs a control signal for controlling the cooling power of the semiconductor cooling plate according to the ambient temperature, so that the operating temperature of the isolator 130 is basically consistent with that of the optical transmitter. When the ambient temperature changes, the temperature change range of the isolator 130 is always within a smaller range. Then, by adjusting the insertion loss and isolation index of the isolator 130 to reach the optimal value within the required working range, not only the isolation index of the isolator 130 is kept in the optimal state, but also the insertion loss value of the isolator 130 within the full temperature working range (such as 0 to 70°C or -40 to 85°C) is greatly reduced, thereby improving the performance of the device.

[0075] Exemplarily, the optical transmission component 100 may also include a circuit board, which is connected to multiple optical transmitters (111, 112, 113), and the circuit board is used to output a driving electrical signal to the optical transmitter, and the optical transmitter outputs an outgoing optical signal of a specific wavelength according to the driving electrical signal.

[0076] Exemplarily, the optical transmission component 100 may further include a backlight power detector, which is used to detect the optical power state of the outgoing optical signal output by the optical transmitter, and the backlight power detector may be connected to the circuit board.

[0077] Exemplarily, a collimating lens is further provided at the light output end of each optical transmitter 111 / 112 / 113, and the output light signal λt1 / λt2 / λt3 output by the optical transmitter 111 / 112 / 113 is collimated by the corresponding collimating lens and then output to the corresponding isolation channel 121 / 122 / 123 or wave plate 131 / 132 / 133.

[0078] See also Figure 6 , Figure 6 It is a schematic diagram of an exemplary structure of another optical transmission component 100 provided in an embodiment of the present application. Figure 6 In the example, the optical transmission component 100 includes a first packaging shell 150, and an optical transmitter (111, 112, 113), an isolator 130, a wave plate (121, 122, 123), a polarization combiner 140, a circuit board 170, a refrigerator 181, and a thermistor 182 arranged in the first packaging shell 150.

[0079] Exemplarily, the first packaging shell 150 is used to provide a packaging environment for the components of the optical transmission assembly 100 , and may be a sealed shell or a hermetically sealed shell.

[0080] Exemplarily, the circuit board 170 may be a ceramic circuit board, and the optical transmission component 100 is electrically connected to the external module via the ceramic circuit board.

[0081] Exemplarily, optical transmitter 111 is a laser in XG(S)PON mode, and the wavelength of its output optical signal is 1577nm, recorded as λt1 signal; optical transmitter 112 is a laser in 50G-PON mode, and the wavelength of its output optical signal is 1342nm, recorded as λt2 signal; optical transmitter 113 is a laser in GPON mode, and the wavelength of its output optical signal is 1490nm, recorded as λt3 signal.

[0082] Exemplarily, each optical transmitter 111 / 112 / 113 may be electrically connected to the circuit board 170 by a gold wire bonding process.

[0083] Exemplarily, the optical transmission component 100 includes wave plates 121, 122, and 123 corresponding to the optical transmitters 111, 112, and 113, and each wave plate 121 / 122 / 123 is used to adjust the polarization state of the output optical signal λt1 / λt2 / λt3 output by the corresponding optical transmitter 111 / 112 / 113.

[0084] Exemplarily, the isolator 130 includes isolation channels 131, 132, and 133 corresponding to the light emitters 111, 112, and 113. A collimating lens 183 is provided at the incident end of each isolation channel 131 / 132 / 133, and the output light signal λt1 / λt2 / λt3 is collimated by the corresponding collimating lens 183 and then incident on the corresponding isolation channel.

[0085] Exemplarily, the wave plates 121 / 122 / 123 are integrated in the corresponding isolation channels 131 / 132 / 133 to improve the device integration level in the optical transmission component 100 , thereby reducing the size of the optical transmission component 100 .

[0086] Exemplarily, each isolation channel includes a polarizer, a Faraday rotator, an analyzer, and a wave plate arranged in sequence. After the optical signal passes through the Faraday rotator, the optical axis will be deflected by 45°, and the wave plate is a component that changes the polarization state of light. In this example, a wave plate is placed on the light output axis of the isolator 130 to adjust the polarization state of the output light signal. The wave plate can be specifically a half-wave plate.

[0087] It should be noted that the polarization state of the optical signal emitted by the output end face of the wave plate 121 / 122 / 123 is related to the angle between the optical signal and the incident end face when the optical signal is incident on the wave plate 121 / 122 / 123. Therefore, the polarization state required by the optical signal can be obtained by controlling the incident angle between the optical signal and the incident end face of the wave plate 121 / 122 / 123. The embodiment of the present application uses the above principle of the wave plate to adjust the polarization state of the output optical signal through the wave plate, for example, so that the output optical signal λt1 / λt2 / λt3 is deflected into a vertical polarization state or a horizontal polarization state after passing through the wave plate.

[0088] Figure 6 The structure of the polarization beam combiner 140 and the requirements for the incident polarization state can be referred to Figure 3 The polarization beam combiner 140 is shown. Figure 3 The polarization beam combiner 140 is shown to be applied to Figure 6 In the example, it is required that the incident polarization state of the λt1 signal and the λt2 signal is a vertical polarization state (ie, an S polarization state), and the incident polarization state of the λt3 signal is a horizontal polarization state (ie, a P polarization state).

[0089] Exemplarily, the initial polarization direction of the λt1 signal output by the optical transmitter 111 is parallel to the paper surface. The λt1 signal is collimated by a collimating lens and then incident on the isolation channel 131. The isolation channel 131 includes a polarizer 1301, a Faraday rotator 1302, an analyzer 1303, and a half-wave plate 121. The optical axis of the λt1 signal deflects 45° after passing through the Faraday rotator 1302. After the optical axis deflects 45°, the optical axis of the λt1 signal deflects again after passing through the half-wave plate 121 and deflects into a vertical polarization state (i.e., an S polarization state). The vertically polarized λt1 signal is incident on Figure 3 The light is transmitted through the S1 surface of the polarization beam combiner 140 and is reflected from the S1 surface to the S2 surface, then transmitted through the S2 surface to the S3 surface, and then reflected from the S3 surface to the S4 surface.

[0090] Exemplarily, the initial polarization direction of the λt2 signal output by the optical transmitter 112 is parallel to the paper surface. The λt2 signal is collimated by the collimating lens and then incident on the isolation channel 132. The isolation channel 132 includes a polarizer 1301, a Faraday rotator 1302, an analyzer 1303 and a half-wave plate 122. The optical axis of the λt2 signal deflects 45° after passing through the Faraday rotator 1302. The optical axis of the λt2 signal deflects 45° after passing through the half-wave plate 1302 and deflects into a vertical polarization state (i.e., S polarization state). The vertically polarized λt2 signal is incident on Figure 3 The light is reflected from the S2 surface of the polarization beam combiner 140 and is then reflected from the S2 surface to the S3 surface and then to the S4 surface.

[0091] Exemplarily, the initial polarization direction of the λt3 signal output by the optical transmitter 113 is parallel to the paper surface. The λt3 signal is collimated by the collimating lens 183 and then incident on the isolation channel 133. The isolation channel 133 includes a polarizer 1301, a Faraday rotator 1302, an analyzer 1303 and a half-wave plate 123. The optical axis of the λt3 signal is deflected by 45° after passing through the Faraday rotator. After the optical axis is deflected by 45°, the optical axis of the λt3 signal is deflected again after passing through the half-wave plate 123 and deflected into a horizontal polarization state (i.e., a P polarization state). The horizontally polarized λt3 signal is incident on Figure 3 The polarization beam combiner shown in FIG. 1 is transmitted through the S3 surface to the S4 surface.

[0092] Exemplarily, a first optical port 160 is disposed at the front end of the first package housing 150. The λt1 signal, the λt2 signal, and the λt3 signal are Figure 3 The S4 surface of the polarization beam combiner shown combines the wavelengths to form a multi-wavelength coupled optical signal, which is output to the outside of the first packaging shell 150 through the first optical port 160 .

[0093] Exemplarily, the refrigerator 181 may be a semiconductor refrigerator, which is used to adjust the temperature of the optical transmitter and the isolator 130 .

[0094] Exemplarily, the thermistor 182 is used to collect ambient temperature parameters within the optical emission component 100 to control the cooling temperature of the semiconductor refrigerator according to the collected ambient temperature parameters, to ensure that the operating temperature of the optical emitter and the isolator 130 is stable within the required temperature range, and to ensure the working performance and reliability of the optical emission component 100.

[0095] Exemplarily, the heat sink 184 is used to carry components such as light emitters (111, 112, 113), collimating lens 183, isolator 130, polarization beam combiner 140, etc. The light emitters 111 / 112 / 113 are arranged on the heat sink through the emitter substrate 185. In addition to carrying the light emitters, the emitter substrate 185 can also be used to adjust the position of the central axis of the optical path.

[0096] Exemplarily, the heat sink 184 can be made of ceramic material, and the surface of the heat sink 184 can be bonded to the light emitter 111 / 112 / 113 by gold wire through the metallization layer, and then by setting gold wire between the metallization layer of the heat sink 184 and the ceramic circuit board, the electrical connection between the light emitter 111 / 112 / 113 and the external module and the circuit board 170 can be achieved.

[0097] Exemplarily, eutectic welding or silver paste mounting process can be used between the heat sink 184 and the refrigerator 181; the thermistor is fixed on the heat sink 184 by eutectic welding or silver paste, and the refrigerator 181 and the thermistor 182 can be combined to control the operating temperature of the optical emitter 111 / 112 / 113, so that the optical emitter 111 / 112 / 113 operates within a stable temperature range.

[0098] Exemplarily, the optical transmitter 111 / 112 / 113 may also include a filter capacitor and a filter capacitor, and both the filter capacitor and the filter capacitor may be disposed on the transmitter substrate 185. The filter capacitor may be placed inside the component or on the PCB of the external module of the component. Considering the performance, this example adopts the method of placing the filter capacitor close to the optical transmitter 111 / 112 / 113. In addition, the filter capacitor and the filter capacitor may be mounted on the heat sink by metal solder eutectic and silver paste pasting process.

[0099] Exemplarily, the optical transmitter 111 / 112 / 113 may further include a backlight power detector, which is used to detect the optical power state of the outgoing optical signal output by the optical transmitter, and the backlight power detector may be disposed on the heat sink 184. In addition, the backlight power detector may be mounted on the heat sink 184 by metal solder eutectic and silver paste pasting process.

[0100] The optical transmission component 100 of the embodiment of the present application utilizes the polarization characteristics of the optical transmitter and the isolator 130 to implement a multi-wavelength combination optical component implementation solution through the polarization combiner 140. While ensuring the isolation index, it reduces the insertion loss and improves the component performance index. At the same time, it can greatly shorten the packaging size of the optical component, providing favorable support for the miniaturization of the module.

[0101] See also Figure 7 , Figure 7 This is an exemplary structural diagram of an optical transceiver provided in an embodiment of the present application, and the optical transceiver includes:

[0102] The optical transmission component 100 comprises a plurality of optical transmitters (111, 112, 113), a plurality of wave plates (121, 122, 123), an isolator 130 and a polarization beam combiner 140, wherein the plurality of optical transmitters (111, 112, 113) are used to output multiple outgoing optical signals of different wavelengths, wherein each optical transmitter 111 / 112 / 113 corresponds to outputting one outgoing optical signal λt1 / λt2 / λt3; each wave plate 121 / 122 / 123 corresponds to one outgoing optical signal λt1 / λt2 / λt3, and is used to deflect the corresponding outgoing optical signal λt1 / λt2 / λt3 into a preset polarization direction and then output it to the polarization beam combiner 140; the polarization beam combiner 140 is used to combine the outgoing optical signals output by each wave plate to output a coupled optical signal of multiple wavelengths; the isolator 130 is used to prevent external optical signals from reflecting to the optical transmitter;

[0103] The optical receiving component 200 is used to receive a first incident optical signal and convert the incident optical signal including at least one wavelength in the first incident optical signal into an electrical signal;

[0104] The optical transceiver branching component 300 is used to transmit the coupled optical signal output by the optical transmitting component 100 to the external network, and to transmit the first incident optical signal input by the external network to the optical receiving component.

[0105] Exemplarily, the isolator 130 in the optical transmission component 100 is disposed on the light incident side of the polarization beam combiner 140 , and the isolator 130 includes a plurality of isolation channels 131 / 132 / 133 corresponding to the outgoing optical signals λt1 / λt2 / λt3 .

[0106] Exemplarily, the wave plates 121 / 122 / 123 in the optical transmission assembly 100 are integrated into corresponding isolation channels 131 / 132 / 133 .

[0107] Exemplarily, the isolator 130 in the optical transmission component 100 is disposed on the light output side of the polarization beam combiner 140 , and the isolator 130 includes isolation channels 131 / 132 / 133 corresponding to the coupled optical signal.

[0108] Exemplarily, the optical transmission assembly 100 further includes a refrigerator, and the optical transmitters (111, 112, 113) are disposed on the refrigerator.

[0109] Exemplarily, the isolator 130 in the optical transmission assembly 100 is disposed on a refrigerator.

[0110] See also Figure 8 , Figure 8 This is a schematic diagram of an exemplary structure of an optical transceiver provided in an embodiment of the present application. Figure 8In the example, the optical transceiver device adopts the form of an integrated package of an optical transmitting component 100 and an optical receiving component 200, and the optical transceiver branching component is integrated in the optical receiving component. The optical transmitting component 100 includes a first packaging shell 150, and the optical receiving component 200 includes a second packaging shell 260. The front end of the first packaging shell 150 is provided with a first optical port 160, the front end of the first packaging shell 260 is provided with a second optical port 251, and the rear end of the first packaging shell 260 is provided with a third optical port 252; the third optical port 252 is connected to the first optical port 160. The optical transmitting component 100 outputs a multi-wavelength coupled optical signal, which is input into the optical receiving component through the first optical port 160 and the third optical port 252, and is transmitted to the second optical port 251 through the optical transceiver branching component integrated in the optical receiving component, and then transmitted to the external network through the second optical port 251. The first incident optical signal of the external network is transmitted to the optical transceiver branching component 300 through the second optical port 251 for branching.

[0111] Exemplarily, the second optical port 251 is used as a common transceiver port of the optical transceiver, and both the outgoing optical signal and the incoming optical signal need to pass through the second optical port 251. Figure 8 As shown, a fiber optic adapter 400 is also provided at the front end of the second optical port 251 , and the fiber optic adapter 400 is used to access an optical fiber for transmitting an optical signal.

[0112] See also Figure 9a and Figure 9b , Figure 9a and Figure 9b This is a schematic diagram of an exemplary structure of a light receiving component provided in an embodiment of the present application. Figure 9a and Figure 9b As shown, the optical receiving component includes a demultiplexing component, multiple reflectors and multiple optical receiving detectors; wherein the demultiplexing component is used to decompose the first incident optical signal into multiple second incident optical signals of different wavelengths, and transmit each second incident optical signal to the corresponding reflector respectively; the reflector is used to reflect the second incident optical signal to the corresponding optical receiving detector; the optical receiving detector is used to convert the second incident optical signal into a received electrical signal.

[0113] For example, Figure 9a and Figure 9bAs shown, the optical receiving component includes an optical receiving detector 211, an optical receiving detector 212 and an optical receiving detector 213. The optical receiving detector 211 is used to receive an incident optical signal of a fourth wavelength, the optical receiving detector 212 is used to receive an incident optical signal of a fifth wavelength, and the optical receiving detector 213 is used to receive an incident optical signal of a sixth wavelength. For ease of description, the incident optical signal of the fourth wavelength is referred to as a λr1 signal, the incident optical signal of the fifth wavelength is referred to as a λr2 signal, and the incident optical signal of the sixth wavelength is referred to as a λr3 signal. The λr1 signal, the λr2 signal and the λr3 signal are incident optical signals of different wavelengths, respectively. In the example of FIG. 9 , the optical receiving detector 211, the optical receiving detector 212 and the optical receiving detector 213 are all in TO packaging.

[0114] For example, Figure 9a and Figure 9b As shown, the optical receiving component includes reflectors 221 , 222 and 223 , wherein reflector 221 is used to reflect the λr1 signal to the optical receiving detector 211 , reflector 222 is used to reflect the λr2 signal to the optical receiving detector 212 , and reflector 223 is used to reflect the λr3 signal to the optical receiving detector 213 .

[0115] Exemplarily, the demultiplexing component includes an optical substrate 270 and a plurality of first optical filters disposed on the optical substrate 270, each of the first optical filters being configured to transmit an incident optical signal of a preset wavelength and reflect an incident optical signal other than the preset wavelength. The optical transceiver branching component includes a second optical filter, the second optical filter being configured to transmit a coupled optical signal and reflect the first incident optical signal to the first optical filter, and the second optical filter being disposed on the optical substrate.

[0116] like Figure 9a and Figure 9b As shown, the first filter includes filter 231, filter 232, filter 233, filter 234 and filter 235, and the second filter includes filter 236. Optionally, the optical substrate is further provided with filter 237. Each filter is used to selectively transmit light of one or more wavelengths.

[0117] Figure 9a and Figure 9b The configuration requirements for the multiple filters shown in are as follows:

[0118] (1) a filter 237 configured to transmit only the λt1, λt2, λt3, λr1, λr2, and λr3 optical signals;

[0119] (2) a filter 236 configured to transmit only the λt1, λt2, and λt3 optical signals;

[0120] (3) filter 231, configured to transmit only the λr3 optical signal;

[0121] (4) a filter 232 configured to reflect the λr1 and λr2 optical signals;

[0122] (5) a filter 233, configured to reflect the λr1 and λr2 optical signals;

[0123] (6) a filter 234, configured to transmit only the λr2 optical signal;

[0124] (7) The optical filter 235 is configured to transmit only the λr1 optical signal.

[0125] Exemplarily, the multi-wavelength coupled optical signal output by the optical transmitting component 100 enters the interior of the optical receiving component, enters the optical substrate after being transmitted through the optical filter 236, and is emitted along the optical substrate to the optical filter 237, and then is transmitted through the optical filter 237 to the optical fiber convergence lens, and then is converged by the optical fiber convergence lens and emitted to the second optical port.

[0126] Exemplarily, the first incident light signal entering from the second optical port includes a λr1 light signal, which is reflected to the filter 235 through filters 237, 236, 231, 232, 233, and 234 in sequence, and then transmitted to the reflector 221 through the filter 235. The reflector 221 reflects the λr1 light signal to the converging lens 241, and then is converged by the converging lens 241 and output to the light receiving detector 211.

[0127] Exemplarily, the first incident light signal entering from the second optical port includes a λr2 light signal, which is reflected to the filter 234 through filters 237, 236, 231, 232, and 233 in sequence, and then transmitted to the reflector 222 through the filter 234. The reflector 222 reflects the λr2 light signal to the converging lens 242, and then is converged by the converging lens 242 and output to the light receiving detector 211.

[0128] Exemplarily, the first incident light signal entering from the second optical port includes a λr3 light signal, which is reflected to the filter 231 by filters 237 and 236 in turn, and then transmitted to the reflector 223 by the filter 231. The reflector 223 reflects the λr3 light signal to the converging lens 243, and then is converged by the converging lens 243 and output to the light receiving detector 213.

[0129] Exemplarily, the optical receiving component includes a first packaging shell 260, a demultiplexing component, multiple reflectors and multiple optical receiving detectors are arranged inside the first packaging shell 260, a second optical port 251 is arranged at the front end of the first packaging shell 260, and a third optical port 252 is arranged at the rear end of the first packaging shell 260; the third optical port 252 is connected to the first optical port 160 of the optical transmitting component 100; the coupled optical signal is transmitted to the external network via the second optical port 251, and the first incident optical signal is transmitted to the demultiplexing component via the second optical port 251.

[0130] For example, as shown in FIG. 9 , a converging lens 244 may be provided at the second optical port 251.

[0131] See also Fig.10 , Fig.10 is a schematic diagram of an exemplary structure of an optical transceiver provided in an embodiment of the present application. Fig.10 In the example, the optical transmitting component 100 and the optical receiving component 200 are in the form of split packaging. The optical transmitting component 100 includes a first packaging shell 150 and multiple optical transmitters (111, 112, 113), multiple wave plates (121, 122, 123), an isolator 130, and a polarization combiner 140 arranged in the first packaging shell 150. The first packaging shell 150 is provided with a first optical port 160, and the first optical port 160 is connected to the optical transceiver branch component 300 through an optical fiber. The optical receiving component 200 includes a second packaging shell 260 and a demultiplexing component, multiple reflectors (221, 222, 223) and multiple optical receiving detectors (211, 212, 213) arranged in the second packaging shell 260; wherein the demultiplexing component includes an optical substrate 270 and multiple filters arranged on the optical substrate 270; the second packaging shell 260 is provided with a second optical port 251, and the second optical port 251 is connected to the optical transceiver branch component 300 through an optical fiber.

[0132] For example, Figure 8 In the optical transmission component 100 shown, the optical transmitter 111 is configured as a laser for emitting 1577nm optical signals in XG(S)PON mode, the optical transmitter 112 is configured as a laser for emitting 1342nm optical signals in 50G-PON mode, and the optical transmitter 113 is configured as a laser for emitting 1490nm optical signals in GPON mode. Figure 8 In the optical receiving component 200 shown, the optical receiving detector 211 is configured as a detector for receiving 1270nm optical signals in XG(S)PON mode, the optical receiving detector 212 is configured as a detector for receiving 1310nm optical signals in 50G-PON mode, and the optical receiving detector 213 is configured as a detector for receiving 1286nm optical signals in GPON mode.

[0133] In the specific working process, the optical signals emitted by the XG(S)PON laser, the 50G-PON laser and the GPON laser enter the polarization beam combiner 140 through the corresponding isolation channels 131 / 132 / 133 and the corresponding optical splitters 121 / 122 / 123 in turn, and the three optical signals λt1, λt2 and λt3 are combined into a multi-wavelength coupled optical signal through the polarization beam combiner 140. The coupled optical signal enters the optical receiving component through the first optical port, and is transmitted to the second optical port 160 through the filter 236, the optical substrate and the filter 237 in the optical receiving component, and then transmitted to the optical fiber through the optical fiber adapter 400. The incident optical signal enters the optical receiving component 200 through the second optical port 251, and the incident optical signals λr1 / λr2 / λr3 of different wavelengths are transmitted to the corresponding optical receiving detectors 211 / 212 / 213 through the optical substrate 270 and the filters on the optical substrate 270.

[0134] According to the embodiment of the present application, the transceiver integration of GPON, XG(S)PON and 50G-PON three-mode coexistence can be realized. The optical component implementation scheme of multi-wavelength Combo is realized through PBC, which reduces insertion loss and improves component performance indicators while ensuring isolation indicators. At the same time, it can greatly shorten the package size of the optical component, providing favorable support for module miniaturization.

[0135] The embodiment of the present application further provides an optical line terminal, the optical line terminal comprising an optical transceiver device, the optical transceiver device comprising:

[0136] The optical transmission component includes a plurality of optical transmitters, a plurality of wave plates, an isolator and a polarization beam combiner, wherein:

[0137] The plurality of optical transmitters are used to output multiple outgoing optical signals of different wavelengths, wherein each optical transmitter outputs one outgoing optical signal; the plurality of wave plates correspond to the plurality of outgoing optical signals one by one, and each wave plate is used to deflect the corresponding outgoing optical signal into a preset polarization direction and then output it to the polarization beam combiner; the polarization beam combiner is used to combine the outgoing optical signals output by each wave plate to output a multi-wavelength coupled optical signal; the isolator is used to prevent external optical signals from being reflected to the optical transmitter;

[0138] An optical receiving component, configured to receive a first incident optical signal and convert an incident optical signal including at least one wavelength in the first incident optical signal into an electrical signal;

[0139] The optical transceiver branching component is used to transmit the coupled optical signal output by the optical transmitting component to the outside, and to transmit the first incident optical signal input from the outside to the optical receiving component.

[0140] In one embodiment, the isolator in the optical transmission component is disposed on the light incident side of the polarization beam combiner, and the isolator includes a plurality of isolation channels corresponding to the plurality of outgoing optical signals one by one.

[0141] In one embodiment, the wave plates in the optical transmission assembly are integrated into the corresponding isolation channels.

[0142] In one embodiment, the isolator in the optical transmission component is arranged at the light output side of the polarization beam combiner, and the isolator includes an isolation channel corresponding to the coupled optical signal.

[0143] In one embodiment, the light emitting assembly further includes a refrigerator, and the light emitter is disposed on the refrigerator.

[0144] In one embodiment, the optical transmission assembly further includes a cooler, and the isolator is disposed on the cooler.

[0145] In one embodiment, the optical transmission component also includes a first packaging shell, multiple optical transmitters, multiple wave plates and a polarization combiner are arranged inside the first packaging shell, the first packaging shell is provided with a first optical port, the coupled optical signal is output to the outside of the first packaging shell through the first optical port, and the isolator is arranged inside the first packaging shell or at the first optical port.

[0146] In one embodiment, the optical receiving component includes a demultiplexing component, multiple reflectors and multiple optical receiving detectors; wherein the demultiplexing component is used to decompose a first incident optical signal into multiple second incident optical signals of different wavelengths, and transmit each second incident optical signal to a corresponding reflector respectively; the reflector is used to reflect the second incident optical signal to the corresponding optical receiving detector; and the optical receiving detector is used to convert the second incident optical signal into a received electrical signal.

[0147] In one embodiment, a demultiplexing component includes an optical substrate and a plurality of first optical filters disposed on the optical substrate, each of the first optical filters being configured to transmit an incident optical signal of a preset wavelength and reflect an incident optical signal other than the preset wavelength.

[0148] In one embodiment, the optical transceiver branch assembly includes a second filter, and the second filter is configured to transmit the coupled optical signal and reflect the first incident optical signal to the first filter.

[0149] In one embodiment, the optical receiving component also includes a second packaging shell, a demultiplexing component, multiple reflectors and multiple optical receiving detectors are arranged inside the second packaging shell, a second optical port is arranged at the front end of the second packaging shell, and a third optical port is arranged at the rear end of the second packaging shell; the third optical port is connected to the first optical port of the optical transmitting component; the coupled optical signal is transmitted to the external network via the second optical port, and the first incident optical signal is transmitted to the demultiplexing component via the second optical port.

[0150] It should be noted that in the embodiments of the present invention, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0151] The above is a specific description of the preferred implementation of the present invention, but the present invention is not limited to the above implementation. Those skilled in the art can make various equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of the present invention.

Claims

1. An optical transmission assembly, comprising a plurality of optical transmitters, a plurality of wave plates, an isolator and a polarization beam combiner, wherein: The multiple optical transmitters are used to output multiple outgoing optical signals of different wavelengths, wherein each of the optical transmitters outputs one outgoing optical signal correspondingly; Each of the wave plates corresponds to one of the outgoing light signals, and is used to deflect the corresponding outgoing light signal into a preset polarization direction and then output it to the polarization beam combiner; The polarization beam combiner is used to combine the outgoing optical signals output by each of the wave plates to output a multi-wavelength coupled optical signal; The isolator is used to block external optical signals from being reflected to the optical transmitter.

2. The light emitting assembly according to claim 1, characterized in that: The isolator is arranged at the light incident side of the polarization beam combiner, and the isolator includes a plurality of isolation channels, each of which corresponds to one of the outgoing light signals.

3. The light emitting assembly according to claim 2, characterized in that: The wave plate is integrated into the corresponding isolation channel, or the wave plate is arranged outside the light incident side of the corresponding isolation channel, or the wave plate is arranged outside the light exit side of the corresponding isolation channel.

4. The light emitting assembly according to claim 1, characterized in that: The isolator is arranged at the light output side of the polarization beam combiner, and the isolator includes an isolation channel corresponding to the coupled optical signal.

5. The light emitting assembly according to claim 1, characterized in that: The invention also comprises a refrigerator, and the light emitter is arranged on the refrigerator.

6. The light emitting assembly according to claim 1, characterized in that: The utility model also comprises a refrigerator, and the isolator is arranged on the refrigerator.

7. The light emitting assembly according to any one of claims 1 to 6, characterized in that: The invention also includes a first packaging shell, wherein the plurality of optical transmitters, the plurality of wave plates and the polarization combiner are arranged inside the first packaging shell, the first packaging shell is provided with a first optical port, the coupled optical signal is output to the outside of the first packaging shell through the first optical port, and the isolator is arranged inside the first packaging shell or at the first optical port.

8. An optical transceiver, comprising: An optical transmitting component, an optical receiving component and an optical transceiver branch component as described in any one of claims 1 to 7; wherein the transceiver branch component is used to transmit the coupled optical signal output by the optical transmitting component to an external network, and to transmit the first incident optical signal input by the external network to the optical receiving component.

9. The optical transceiver according to claim 8, characterized in that: The optical receiving component includes a demultiplexing component, a plurality of reflectors and a plurality of optical receiving detectors; wherein, The demultiplexing component is used to decompose the first incident optical signal into multiple second incident optical signals with different wavelengths, and transmit each of the second incident optical signals to the corresponding reflector respectively; The reflector is used to reflect the second incident light signal to the corresponding light receiving detector; The light receiving detector is used to convert the second incident light signal into a receiving electrical signal.

10. The optical transceiver according to claim 9, characterized in that: The demultiplexing component includes an optical substrate and a plurality of first optical filters disposed on the optical substrate, each of the first optical filters being configured to transmit an incident optical signal of a preset wavelength and reflect an incident optical signal other than the preset wavelength.

11. The optical transceiver according to claim 10, characterized in that: The optical transceiver branch assembly includes a second filter, and the second filter is configured to transmit the coupled optical signal and reflect the first incident optical signal to the first filter.

12. The optical transceiver according to claim 9, characterized in that: The optical receiving component also includes a second packaging shell, the demultiplexing component, the multiple reflectors and the multiple optical receiving detectors are arranged inside the second packaging shell, the front end of the second packaging shell is provided with a second optical port, and the rear end of the second packaging shell is provided with a third optical port; the third optical port is connected to the first optical port of the optical transmitting component; the coupled optical signal is transmitted to the external network via the second optical port, and the first incident optical signal is transmitted to the demultiplexing component via the second optical port.

13. An optical line terminal, comprising the optical transceiver according to claim 8.

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