Optical transceiver module, optical network terminal and communication system

Abstract

The embodiment of the present invention provides an optical transceiver module, an optical network terminal and a communication system. The third port of the circulator is connected to the optical receiving component and the connector of the optical transceiver module in sequence. Through the first port of the circulator, a first optical signal generated by the optical sending component based on a first electrical signal from the connector can be received, and sent to a communication counterpart through the second port. Also, a second optical signal of the communication counterpart is received through the second port of the circulator and converted into a second electrical signal by the optical sending component and sent to the connector, thereby realizing single-fiber bidirectional transmission. Since the circulator supports the same wavelength in the sending direction and the receiving direction, the optical transceiver module provides a basis for using the same wavelength for sending and receiving optical signals. The sending and receiving signals share one optical fiber, which can effectively save the cost of optical fiber resources. At the same time, the wavelengths in the sending and receiving directions use the same band, which greatly reduces the complexity and cost of networking, control and maintenance.

Description

Technical Field

[0001] The present invention relates to the field of communications, and in particular to an optical transceiver module, an optical network terminal and a communication system. Background Art

[0002] 5G technology is about to enter the commercialization process. Optical modules are the basic components of the physical layer of 5G networks and are widely used in wireless and transmission equipment. Their cost accounts for a high proportion of system equipment, and some equipment can reach 70%. Based on the requirements of low cost and wide coverage, 5G fronthaul has put forward higher requirements for optical modules. There is an urgent need for new optical modules with higher speed, longer distance, wider temperature and lower cost.

[0003] In the relevant fronthaul network, 10Gb / s, 25Gb / s NRZ or 50G PAM4 single-fiber bidirectional transmission is adopted. In the relevant fronthaul network, when a single-fiber bidirectional transmission is adopted between the AAU (Active Antenna Unit) and the DU (Distribute Unit), the optical transceiver modules on the ONT (Optical Network Termina) of the two adopt the dielectric thin film filter TFF, which requires that the optical signal in the sending direction and the optical signal in the receiving direction must use different wavelengths on the light, resulting in high complexity and high cost of networking, control and maintenance.

[0004] In addition, in the related fronthaul network, the use of 10Gb / s, 25Gb / s NRZ or 50G PAM4 single-fiber bidirectional transmission methods is also difficult to meet the bandwidth requirements of high-frequency sites after large-scale deployment of 5G. Summary of the invention

[0005] An optical transceiver module, an optical network terminal and a communication system provided by the embodiments of the present invention solve the problem in the related art that when single-fiber bidirectional transmission is adopted, the optical signal in the sending direction and the optical signal in the receiving direction must use different wavelengths, resulting in high complexity and high cost in networking, control and maintenance.

[0006] To solve the above technical problems, an embodiment of the present invention provides an optical transceiver module, comprising: a connector, a signal driver, an optical transmitting component, an optical receiving component and a circulator;

[0007] The connector, the signal driver, and the optical transmission component are connected in sequence, the output end of the optical transmission component is connected to the first port of the circulator; the second port of the circulator is connected to the communication peer; the third port of the circulator, the optical receiving component, and the connector are connected in sequence;

[0008] The connector is used to send the first electrical signal to be sent out to the signal driver; the signal driver performs signal shaping and amplification processing on the received first electrical signal and then sends it to the optical sending component; the optical sending component converts the received first electrical signal into a first optical signal and then sends it to the first port, and the first port sends the first optical signal to the communication peer through the second port;

[0009] The second port receives the second optical signal from the communication peer and sends it to the optical receiving component through the third port. The optical receiving component converts the received second optical signal into a second electrical signal and sends it to the connector.

[0010] To solve the above technical problems, an embodiment of the present invention also provides an optical network terminal, including a single board and the optical transceiver module as described above, wherein the single board is connected to the connector of the optical transceiver module and is used to send a first electrical signal to the connector or receive a second electrical signal from the connector.

[0011] To solve the above technical problems, an embodiment of the present invention further provides a communication system, comprising an active antenna unit and a distribution unit, wherein the active antenna unit and the distribution unit respectively comprise a first optical network terminal and a second optical network terminal, wherein the first optical network terminal and the second optical network terminal both comprise the optical transceiver module as described above, and the circulator of the optical transceiver module of the first optical network terminal is communicatively connected with the circulator of the optical transceiver module of the second optical network terminal.

[0012] Beneficial Effects

[0013] According to the optical transceiver module, optical network terminal and communication system provided by the embodiment of the present invention, the connector, signal driver and optical sending component of the optical transceiver module are connected in sequence, the output end of the optical sending component is connected to the first port of the circulator; the second port of the circulator is connected to the communication peer; the third port of the circulator is connected to the optical receiving component and the connector of the optical transceiver module in sequence; the first port of the circulator can receive the first optical signal generated by the optical sending component based on the first electrical signal from the connector, and send it to the communication peer through the second port, and the second optical signal of the communication peer is received through the second port of the circulator and converted into a second electrical signal by the optical sending component and sent to the connector, so as to realize single-fiber bidirectional transmission, and because the circulator has no restrictions on the wavelength used for the transmission of the optical signal, it can support the use of the same wavelength in the sending direction and the receiving direction, so the optical transceiver module provides a basis for using the same wavelength for sending and receiving optical signals, and the sending and receiving signals share one optical fiber, which can effectively save the cost of optical fiber resources, and the wavelengths of the sending and receiving directions use the same band, compared with the single-fiber bidirectional receiving and sending using different bands used in the related fronthaul network, the complexity and cost of networking, control and maintenance are greatly reduced.

[0014] Furthermore, the optical transceiver module, optical network terminal and communication system provided by the embodiments of the present invention can, based on PAM4 technology, convert 8 non-return-to-zero NRZ signals with a bit rate of 25G in the sending direction into 4 pulse 4-level modulation PAM4 signals with a bit rate of 50G, and then convert them into corresponding 4 optical signals through the optical sending component for transmission, and convert the corresponding 4 PAM4 signals with a bit rate of 50G obtained according to the conversion of the 4 optical signals in the receiving direction into 8 NRZ signals with a bit rate of 25G and then send them to the connector, thereby realizing transmission at a baud rate of 200G by utilizing an optical sending component and an optical receiving component with a baud rate of 100G; the 200G bandwidth not only meets the needs of a large number of AAU aggregation networking at 5G high-frequency sites, but also greatly saves the cost of optical components.

[0015] Other features and corresponding beneficial effects of the present invention are described in the latter part of the specification, and it should be understood that at least part of the beneficial effects become obvious from the description in the specification of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The structure of the optical transceiver module of the first embodiment of the present invention is shown in FIG. Figure 1 ;

[0017] Figure 2 The structure of the optical transceiver module of the first embodiment of the present invention is shown in FIG. Figure 2 ;

[0018] Figure 3 This is a schematic diagram of the structure of an optical transmission component according to Embodiment 1 of the present invention;

[0019] Figure 4 This is a schematic diagram of the structure of an optical receiving component according to Embodiment 1 of the present invention;

[0020] Figure 5 This is a schematic diagram of the structure of an optical network terminal according to a second embodiment of the present invention;

[0021] Figure 6 This is a schematic diagram of the communication system structure of Embodiment 2 of the present invention;

[0022] Figure 7 This is a schematic diagram of the structure of an optical transceiver module according to the second embodiment of the present invention;

[0023] Figure 8 This is a schematic diagram of a 4-channel structure of the second embodiment of the present invention. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the following is a further detailed description of the embodiments of the present invention through specific implementation methods combined with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0025] Embodiment 1:

[0026] Aiming at the problem that the optical signal in the sending direction and the optical signal in the receiving direction of the optical transceiver module on the ONT in the relevant fronthaul network must use different wavelengths on the light, resulting in high complexity and high cost of networking, control and maintenance, and the problem that in the relevant fronthaul network, it is difficult to meet the bandwidth requirements of high-frequency sites after large-scale deployment of 5G by using 10Gb / s, 25Gb / s NRZ or 50G PAM4 single-fiber bidirectional transmission mode. This embodiment provides a new structure of the optical transceiver module, which provides a basis for using the same wavelength for sending and receiving optical signals, which can effectively save the cost of optical fiber resources and enable the wavelengths in the sending and receiving directions to use the same band. Compared with the method of using different bands for single-fiber bidirectional reception and transmission used in the relevant fronthaul network, the complexity and cost of networking, control and maintenance are greatly reduced.

[0027] For ease of understanding, this embodiment is described below in conjunction with Figure 1 The optical transceiver module shown is used as an example for illustration. The optical transceiver module can be applied to, but not limited to, various optical network terminals. Figure 1 As shown, it includes: a connector 1, a signal driver 2, an optical transmitting component 3, an optical receiving component 4 and a circulator 5; wherein:

[0028] Connector 1, signal driver 2, and optical transmission component 3 are connected in sequence, the output end of optical transmission component 3 is connected to the first port of circulator 5; the second port of circulator 5 is connected to the communication peer; the third port of circulator 5, optical receiving component 4, and connector 1 are connected in sequence; that is, the second port of circulator 5 in this embodiment serves as an external common port for transmitting and receiving, and the signal input from the first port is output from the second port, and the signal input from the second port is output from the third port. In addition, it should be understood that the specific type of circulator in this embodiment can be flexibly selected according to needs, as long as the above-mentioned signal forwarding path can be realized; based on Figure 1 The signal sending and receiving process of the optical transceiver module shown is as follows:

[0029] Regarding the signal sending direction: the connector 1 obtains the first electrical signal to be sent outward (the connector can obtain the first electrical signal to be sent to the communication peer from the single board connected thereto or other places), and sends the obtained first electrical signal to be sent outward to the signal driver 2; the signal driver 2 performs signal shaping and amplification processing on the received first electrical signal, and then sends it to the optical sending component 3; the optical sending component 3 converts the received first electrical signal into a first optical signal and then sends it to the first port of the circulator 5, the first port of the circulator 5 sends the received first optical signal to the second port of the circulator 5, and the second port of the circulator 5 sends the first optical signal to the communication peer through the optical fiber connected to the communication peer, thereby realizing the sending of the optical signal;

[0030] Regarding the signal receiving direction: the second port of the circulator 5 receives the second optical signal sent by the communication counterpart through the optical fiber connected to the communication counterpart, and sends the received second optical signal to the third port of the circulator 5. The third port of the circulator 5 sends the received second optical signal to the optical receiving component 4. The optical receiving component 4 converts the received second optical signal into a second electrical signal and sends it to the connector 1, thereby realizing the reception of the optical signal.

[0031] It can be seen that through this embodiment Figure 1 The optical transceiver module shown can realize single-fiber bidirectional communication, which can effectively save the cost of optical fiber resources. At the same time, since the circulator supports the use of the same wavelength in the sending direction and the receiving direction, the optical transceiver module provides a basis for using the same wavelength for sending and receiving optical signals. Compared with the single-fiber bidirectional reception and transmission in the related fronthaul network using different bands, it greatly reduces the complexity and cost of networking, control and maintenance.

[0032] In this embodiment, the connector 1 can be implemented by but not limited to packaging a pluggable optical module, and the type of the packaged pluggable optical module can be flexibly selected, for example, it can be but not limited to a CFP connector, a CFP2 connector or a CFP4 connector.

[0033] For some examples of this embodiment, see Figure 2As shown, according to the needs, the optical transceiver module in this embodiment may also include a signal conversion module 6 connected between the connector 1 and the signal driver 2, and the connector 1 sends the first electrical signal to be sent out to the signal conversion module 6, which is converted by the signal conversion module 6 and sent to the signal driver 2. The optical receiving component 4 is also connected to the connector 1 via the signal conversion module 6, and the optical receiving component 4 sends the second electrical signal to the connector 1 through the signal conversion module 6. The specific conversion processing of the first electrical signal and the second electrical signal by the signal conversion module 6 can be flexibly set according to the specific application scenario. For example, in the relevant fronthaul network, the use of 10Gb / s, 25Gb / s NRZ or 50G PAM4 single-fiber bidirectional transmission methods is difficult to meet the bandwidth requirements of high-frequency sites after the large-scale deployment of 5G, and in the current fronthaul network, the optical transceiver module that supports a bit rate of 200G is still blank. To address this problem, the optical transceiver module provided in this embodiment can also convert the 8-way non-return-to-zero NRZ signals with a bit rate of 25G in the sending direction into 4-way pulse 4-level modulation PAM4 signals with a bit rate of 50G based on PAM4 technology, and then convert them into corresponding 4-way optical signals through the optical sending component 3 for transmission, and convert the corresponding 4-way PAM4 signals with a bit rate of 50G obtained according to the conversion of the 4-way optical signals in the receiving direction into 8-way NRZ signals with a bit rate of 25G and then send them to connector 1, thereby realizing transmission at a baud rate of 200G by utilizing the optical sending component 3 with a baud rate of 100G and the optical receiving component 4; the bandwidth of 200G not only meets the needs of a large number of AAU aggregation and networking at 5G high-frequency sites, but also can save the cost of optical components to a great extent.

[0034] To achieve the above purpose, in an example of this embodiment: the connector 1 may be a signal transceiver channel with 8 channels and a bit rate of 25G, and the first electrical signal is an 8-channel non-return-to-zero NRZ signal with a bit rate of 25G received by the connector 1;

[0035] The signal conversion module 6 adopts the pulse 4-level modulation PAM4 technology to convert the 8-channel NRZ signals with a bit rate of 25G transmitted from the connector 1 into 4-channel PAM4 signals with a bit rate of 50G;

[0036] The signal driver 2 is a linear driver with a 4-channel baud rate of 28G. After signal shaping and amplification processing is performed on each of the 4 PAM4 signals with a bit rate of 50G received from the signal conversion module 6, the signal is sent to the optical sending component 3; the specific signal shaping and amplification processing method can be flexibly set according to specific needs;

[0037] See also Figure 3As shown, the optical transmission component 3 in this example includes a laser 31 and a multiplexer 33. The laser 31 has 4 signal transmission channels with a baud rate of 28G, which is used to convert each of the 4 received PAM4 signals with a bit rate of 50G into a corresponding optical signal and send it to the multiplexer 33; the multiplexer 33 synthesizes the 4 received optical signals into one optical signal as the first optical signal, and sends it to the first port of the circulator; thereby realizing the transmission of the optical signal.

[0038] See also Figure 3 As shown, the optical sending component 3 specifically includes a modulator 32 connected to the laser 31; the modulator 32 modulates the 4 optical signals converted by the laser 31 and then sends them to the multiplexer 33, wherein the modulator 32 can be but not limited to an EA modulator.

[0039] See also Figure 4 As shown, the optical receiving component 4 includes a demultiplexer DEMUX41 and a receiver 42, wherein the receiver is a signal receiving channel with 4-way baud rate of 28G;

[0040] The demultiplexer 41 decomposes the second optical signal received from the third port of the circulator 5 into 4 optical signals and sends them to the receiver 42; the receiver 42 converts the received 4 optical signals into corresponding 4 PAM4 signals with a bit rate of 50G as the second electrical signal, and sends them to the signal conversion module 6; the signal conversion module 6 converts the 4 PAM4 signals with a bit rate of 50G received from the receiver 42 into 8 NRZ signals with a bit rate of 25G and sends them to the connector 1; thereby realizing the reception of optical signals.

[0041] In this example, the wavelength used by the optical transceiver module in the sending direction and the receiving direction can also be the same. At this time, the wavelength of the four optical signals obtained after the laser 31 converts each of the four received PAM4 signals with a bit rate of 50G into a corresponding optical signal is the same as the wavelength of the four optical signals obtained after the demultiplexer 41 decomposes the received second optical signal into four optical signals. And the specific wavelength range can be flexibly set according to specific application requirements. For example, in an application scenario, the wavelengths of the four optical signals obtained after the laser 31 converts each of the four received PAM4 signals with a bit rate of 50G into a corresponding optical signal can be set to be: 1294.56nm~1296.56nm, 1299.05nm~1301.05nm, 1303.58nm~1305.58nm and 1308.14nm~1310.14nm. For example, in one example, the wavelengths of the four optical signals may be 1295.56 nm, 1230.05 nm, 1304.58 nm and 1307.14 nm respectively.

[0042] It can be seen that the optical transceiver module provided in this embodiment has at least but not limited to the following advantages:

[0043] PAM4 modulation technology can be used to achieve 200G bit rate transmission using 100G baud rate optical components. Compared with traditional 100G optical modules, 200G transmission can be achieved under the same optical device bandwidth, greatly reducing the cost of optical components.

[0044] In addition, the use of single-fiber bidirectional technology saves a lot of optical fiber resources compared to traditional dual-fiber bidirectional technology, greatly saving 5G deployment costs.

[0045] At the same time, the optical transceiver module can adopt the same-band technology. Compared with the single-fiber bidirectional A / B wave transmission, the two optical modules use the same wavelength, which greatly reduces the difficulty of network deployment and maintenance.

[0046] Embodiment 2:

[0047] This embodiment further provides an optical network terminal ONT based on the above embodiment. Figure 5 As shown, it includes a single board 7 and an optical transceiver module as shown in the above embodiment. Figure 5 As shown, the single board 7 is connected to the connector 1 of the optical transceiver module, and is used to send a first electrical signal to the connector 1, and the first electrical signal can be finally sent to the communication counterpart in the form of a first optical signal through the signal sending process shown in the above embodiment; and receive a second electrical signal from the connector 1, wherein the second electrical signal is obtained by converting the second optical signal received from the communication counterpart as shown in the above embodiment.

[0048] The optical network terminal ONT in this embodiment can be applied to various communication application scenarios. For example, in one example, it can be applied to but not limited to the fronthaul network. To this end, this embodiment also provides a communication system, see Figure 6 As shown, it includes an active antenna unit AAU and a distribution unit DU, the active antenna unit and the distribution unit respectively include a first optical network terminal and a second optical network terminal, the first optical network terminal and the second optical network terminal both include an optical transceiver module as shown in the above embodiment, and the circulator 5 of the optical transceiver module of the first optical network terminal is communicatively connected with the circulator 5 of the optical transceiver module of the second optical network terminal, thereby realizing the optical signal interaction between the active antenna unit AAU and the distribution unit DU. For ease of understanding, this embodiment is described below by taking a specific optical transceiver module structure adopted by the first optical network terminal and the second optical network terminal as an example, see Figure 7 As shown, the optical transceiver module specifically includes:

[0049] High-speed connector: Use CFP2 connector, use 8 channels, and each channel transmits a 25GNRZ signal.

[0050] Signal conversion module: PAM4 modulation is adopted and implemented using DSP chip to convert 8-channel NRZ signals into 4-channel PAM4 signals. Corresponding to the application scenario of fronthaul network, DSP chip can be selected but not limited to industrial-grade chips.

[0051] Driver: Use a 4-channel driver with a baud rate of 28G. The driver chip is used to drive, amplify and shape the PAM4 signal output by the DSP. For PAM4 modulation, the driver can use but is not limited to a linear driver, and optionally an industrial-grade chip can also be used.

[0052] The laser of the 4-channel optical transmitting component and the receiver of the 4-channel optical receiving component can be implemented by, but not limited to, a 4-channel 28G baud rate BOX package. The laser converts the electrical signal into an optical signal, and the receiver converts the optical signal into an electrical signal. The laser and receiver in this example also support industrial-grade applications.

[0053] Single-fiber bidirectional transmission is achieved through a 3-port circulator. The common port (i.e., the second port) of the circulator is used as the output port of the module, and the other two ports (i.e., the first port and the third port) are connected to the laser and the receiver respectively. The optical signal output by the laser passes through the circulator and then outputs through the common port of the circulator. The input optical signal passes through the common port of the circulator and is connected to the receiver for photoelectric conversion. Therefore, the circulator in this example is the core component for achieving single-fiber bidirectional transmission and supports same-wavelength transmission.

[0054] The same band is achieved through a circulator, which can be used to achieve the same wavelength for the modules that transmit and receive. In this embodiment, LAN-WDM wavelengths are used, which are 1295.56nm, 1300.05nm, 1304.58nm and 1309.14nm.

[0055] against Figure 7 The optical transceiver module shown in the figure has the following optical signal sending and receiving processes:

[0056] In the transmission direction, the 8-channel 25G NRZ signals from the CFP2 high-speed connector are converted into 4-channel 50G PAM4 signals through the DSP chip processing. The 4-channel 50G PAM4 signals are shaped and amplified by the 4-channel 28G linear driver. The shaped and amplified 4-channel 50G PAM4 signals enter the EA modulator of the optical transmission component to modulate the optical signal emitted by the laser. The optical signal output by the laser is combined into one optical signal and then output through the circulator.

[0057] In the receiving direction, the 4-channel 50G PAM4 optical signal input from the circulator is converted into a 4-channel 50G PAM4 electrical signal through the 4-channel receiver. The 4-channel 50G PAM4 electrical signal output by the receiver is converted into an 8-channel 25G NRZ signal through the DSP chip. The 8-channel 25G NRZ signal is sent to the single board through the CFP2 high-speed connector.

[0058] In this example, the core device for achieving single-fiber bidirectional transmission is a 3-port Circulator. The two ends of the circulator are connected to the laser and the receiver respectively, and the other end COM is used as the common port for transmission and reception. In this way, the characteristics of unified transmission and reception and single-fiber bidirectional transmission can be achieved. At the same time, the circulator supports the use of the same wavelength for transmission and reception signals, which is also a key factor in achieving same-wavelength transmission.

[0059] Undertake Figure 6 In the application scenario shown, it is assumed that the first optical network terminal specifically includes a first laser, a first MUX, a first receiver, a first DEMUX and a first circulator, and the second network terminal specifically includes a second laser, a second MUX, a second receiver, a second DEMUX and a second circulator. The first laser outputs optical signals of four wavelengths L4-L7, and the four wavelengths are the central wavelengths of the LAN-WDM defined by the standard. They are synthesized into one path through the first MUX passive device, and then output to a single transmission optical fiber through the first circulator, and then reach the second circulator through the transmission optical fiber, and enter the second DEMUX device on the right after passing through the second DEMUX device. After passing through the second DEMUX device, the wavelength is divided into four paths and input to the second receiver. The second receiver converts it into four electrical signals and sends them to the subsequent second connector after subsequent signal conversion, thereby realizing the transmission of optical signals between the first optical network terminal and the second optical network terminal.

[0060] It can be seen that those skilled in the art should understand that all or some steps, systems, and functional modules / units in the above disclosed methods can be implemented as software (which can be implemented by computer program code executable by a computing device), firmware, hardware, and appropriate combinations thereof. In hardware implementations, the division between the functional modules / units mentioned in the above description does not necessarily correspond to the division of physical components; for example, a physical component can have multiple functions, or a function or step can be performed by several physical components in cooperation. Some or all physical components can be implemented as software executed by a processor, such as a central processing unit, a digital signal processor, or a microprocessor, or implemented as hardware, or implemented as an integrated circuit, such as an application-specific integrated circuit.

[0061] In addition, it is well known to those skilled in the art that communication media generally contain computer readable instructions, data structures, computer program modules or other data in modulated data signals such as carrier waves or other transmission mechanisms, and may include any information delivery media. Therefore, the present invention is not limited to any specific hardware and software combination.

[0062] The above contents are further detailed descriptions of the embodiments of the present invention in combination with specific implementation methods, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. An optical transceiver module, characterized in that: include: Connectors, signal conversion modules, signal drivers, optical transmitting components, optical receiving components, and circulators; The connector, the signal conversion module, the signal driver, and the optical transmission component are connected in sequence, the output end of the optical transmission component is connected to the first port of the circulator; the second port of the circulator is connected to the communication peer; the third port of the circulator, the optical receiving component, and the connector are connected in sequence, and the connector has 8 signal transceiver channels with a bit rate of 25G; The connector sends the first electrical signal to be sent out to the signal conversion module, which is converted by the signal conversion module and sent to the signal driver. The first electrical signal is 8 non-return-to-zero NRZ signals with a bit rate of 25G received through the connector; the signal conversion module converts the 8 NRZ signals with a bit rate of 25G into 4 pulse 4-level modulation PAM4 signals with a bit rate of 50G. The signal driver is a linear driver with a 4-channel baud rate of 28G. After signal shaping and amplification processing is performed on each of the 4 PAM4 signals with a bit rate of 50G, the signal is sent to the optical sending component; the optical sending component converts the received first electrical signal into a first optical signal and sends it to the first port. The first port sends the first optical signal to the communication peer through the second port; The second port receives the second optical signal from the communication peer and sends it to the optical receiving component through the third port. The optical receiving component converts the received second optical signal into a second electrical signal and sends it to the connector.

2. The optical transceiver module according to claim 1, characterized in that: The optical transmission component includes a laser and a multiplexer, wherein the laser has 4 signal transmission channels with a baud rate of 28G, and is used to convert each of the 4 received PAM4 signals with a bit rate of 50G into a corresponding optical signal and send it to the multiplexer; The multiplexer combines the received four optical signals into one optical signal as the first optical signal, and sends the signal to the first port.

3. The optical transceiver module according to claim 2, characterized in that: The optical transmission component also includes a modulator connected to the laser; The modulator modulates the 4 optical signals converted by the laser and sends the modulated signals to the multiplexer.

4. The optical transceiver module according to claim 2 or 3, characterized in that: The optical receiving component is connected to the connector via the signal conversion module, and the optical receiving component sends the second electrical signal to the connector via the signal conversion module.

5. The optical transceiver module according to claim 4, characterized in that: The optical receiving component includes a demultiplexer and a receiver, and the receiver has 4 signal receiving channels with a baud rate of 28G; The demultiplexer decomposes the second optical signal received from the third port into four optical signals and sends them to the receiver; The receiver converts the received 4 optical signals into corresponding 4 PAM4 signals with a bit rate of 50G as the second electrical signal, and sends them to the signal conversion module; The signal conversion module converts the received 4-channel PAM4 signals with a bit rate of 50G into 8-channel NRZ signals with a bit rate of 25G and sends them to the connector.

6. The optical transceiver module according to claim 5, characterized in that: The wavelengths of the four optical signals obtained after the laser converts each of the four received PAM4 signals with a bit rate of 50G into corresponding optical signals are the same as the wavelengths of the four optical signals obtained after the demultiplexer decomposes the received second optical signal into four optical signals.

7. The optical transceiver module according to claim 6, characterized in that: The laser converts each of the four received PAM4 signals with a bit rate of 50G into a corresponding optical signal, and the wavelengths of the four optical signals obtained are: 1294.56nm~1296.56nm, 1299.05nm~1301.05nm, 1303.58nm~1305.58nm and 1308.14nm~1310.14nm.

8. An optical network terminal, characterized in that: It comprises a single board and an optical transceiver module as described in any one of claims 1 to 7, wherein the single board is connected to a connector of the optical transceiver module and is used to send a first electrical signal to the connector or receive a second electrical signal from the connector.

9. A communication system, characterized in that: The invention comprises an active antenna unit and a distribution unit, wherein the active antenna unit and the distribution unit respectively comprise a first optical network terminal and a second optical network terminal, wherein the first optical network terminal and the second optical network terminal both comprise an optical transceiver module according to any one of claims 1 to 7, and a circulator of the optical transceiver module of the first optical network terminal is communicatively connected with a circulator of the optical transceiver module of the second optical network terminal.

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