Optical module and its parameter transmission, detection method, control method, and fronthaul system

Abstract

The present invention provides a performance parameter transmission method of a remote optical module of a remote node, a detection method for detecting the performance of a remote optical module, a control parameter transmission method for controlling a remote optical module of a remote node, a control method for a remote optical module of a remote node, a remote optical module, a near-end optical module, and a fronthaul system. The performance parameter transmission method includes: when at least one of the multiple registers of the remote optical module becomes a first source register, an uplink optical signal is generated according to the identification information of the first source register and the register value of the first source register, wherein the first source register is a register whose register value changes among the multiple registers, and there is a mapping relationship between the register value of each register and each performance parameter of the remote optical module; the uplink optical signal is transmitted to the near-end optical module of the near-end node. The present invention realizes remote control of optical modules and remote monitoring of performance.

Description

Technical Field

[0001] The present disclosure relates to the field of communication technology, and in particular, to a method for transmitting performance parameters of an optical module of a remote node, a method for detecting the performance of an optical module of a remote node, a method for transmitting control parameters of an optical module of a remote node, a method for controlling an optical module of a remote node, and a fronthaul system. Background Art

[0002] The distributed base station system adopts a design that separates the baseband processing unit (BBU) and the radio remote unit (RRU). In the 5G radio access network (RAN) architecture, the two-level structure consisting of BBU and RRU has further evolved into a three-level structure consisting of a centralized unit (CU), a distributed unit (DU), and an active antenna processing unit (AAU). The connections between the BBU and RRU in the two-level structure and between the CU, DU, and AAU in the three-level structure are all made through optical fibers.

[0003] In the prior art, there is a lack of effective methods for monitoring the performance of optical modules in a remote RRU or AAU. Summary of the invention

[0004] In order to solve at least one aspect of the above-mentioned problems existing in the prior art, the present disclosure provides a method for transmitting performance parameters of an optical module of a remote node, a detection method for detecting the performance of an optical module of a remote node, a method for transmitting control parameters of an optical module of a remote node, a control method for an optical module of a remote node, and a fronthaul system.

[0005] As a first aspect of the present disclosure, a method for transmitting performance parameters of a remote optical module of a remote node is provided, comprising:

[0006] When at least one of the multiple registers of the remote optical module becomes a first source register, an uplink optical signal is generated according to the identification information of the first source register and the register value of the first source register, wherein the first source register is a register whose register value changes among the multiple registers, and there is a mapping relationship between the register value of each register and each performance parameter of the remote optical module;

[0007] The uplink optical signal is transmitted to a proximal optical module of a proximal node.

[0008] Optionally, generating an uplink optical signal according to the identification information of the first source register and the register value of the first source register includes:

[0009] generating a first top adjustment signal according to the identification information of the first source register and the register value of the first source register;

[0010] Performing top adjustment on the uplink main signal of the remote optical module according to the first top adjustment signal;

[0011] The adjusted uplink main signal is converted into the uplink optical signal.

[0012] As a second aspect of the present disclosure, a detection method for detecting performance of a remote optical module of a remote node is provided, comprising:

[0013] Modify the register value of the corresponding mapping register in the mapping register group of the proximal optical module of the proximal node according to the received predetermined uplink optical signal, wherein the predetermined uplink optical signal is an uplink optical signal sent by the remote optical module of the remote node according to the performance parameter transmission method described in the first aspect of the present disclosure, and the mapping register group includes a plurality of the mapping registers, and the plurality of the mapping registers correspond one-to-one to the plurality of registers of the remote optical module;

[0014] The operating state of the remote optical module is determined according to the modified register value of the mapping register.

[0015] Optionally, the step of the remote optical module generating the uplink optical signal includes:

[0016] Generate a first adjustment signal according to identification information of a first source register and a register value of the first source register, wherein the first source register is a register whose register value changes among multiple registers of the remote optical module;

[0017] Performing top adjustment on the uplink main signal of the remote optical module according to the first top adjustment signal;

[0018] Converting the adjusted uplink main signal into the uplink optical signal;

[0019] Modifying the register value of the corresponding mapping register in the mapping register group of the proximal optical module of the proximal node according to the received predetermined uplink optical signal includes:

[0020] Converting the predetermined uplink optical signal into an uplink electrical signal;

[0021] Extracting the first top adjustment signal from the uplink electrical signal;

[0022] Demodulating the first top modulation signal to obtain identification information of the first source register and a register value of the first source register;

[0023] Determine, according to the identification information, a mapping register corresponding to the first source register as a first target register;

[0024] The register value of the first target register is modified to the corresponding register value of the first source register.

[0025] As a third aspect of the present disclosure, a control parameter transmission method for controlling a remote optical module of a remote node is provided, comprising:

[0026] When at least one mapping register in the mapping register group of the proximal optical module of the proximal node becomes a second source register, a downlink optical signal is generated according to the identification information of the second source register and the register value of the second source register, wherein the plurality of mapping registers in the mapping register group correspond one-to-one to the plurality of registers in the remote optical module of the remote node, the second source register is a mapping register whose register value changes among the plurality of mapping registers, and a mapping relationship exists between the register value of each mapping register and each control parameter of the remote optical module;

[0027] The downlink optical signal is transmitted to the remote optical module.

[0028] Optionally, generating a downlink optical signal according to the identification information of the second source register and the register value of the second source register includes:

[0029] generating a second top adjustment signal according to the identification information of the second source register and the register value of the second source register;

[0030] Performing top adjustment on the downlink main signal of the proximal optical module according to the second top adjustment signal;

[0031] The adjusted downlink main signal is converted into the downlink optical signal.

[0032] As a fourth aspect of the present disclosure, a method for controlling a remote optical module of a remote node is provided, including:

[0033] The register values ​​of corresponding registers in the remote optical module are modified according to the received predetermined downlink optical signal, wherein the predetermined downlink optical signal is a downlink optical signal sent by the proximal optical module of the proximal node according to the control parameter transmission method described in the third aspect of the present disclosure, and there is a mapping relationship between the register values ​​of each register of the remote optical module and the various control parameters of the remote optical module.

[0034] Optionally, the step of the proximal optical module generating the downlink optical signal includes:

[0035] Generate a second top adjustment signal according to the identification information of the second source register and the register value of the second source register, wherein the plurality of mapping registers in the mapping register group of the proximal optical module correspond one-to-one to the plurality of registers of the remote optical module, and the second source register is a mapping register whose register value changes among the plurality of mapping registers;

[0036] Performing top adjustment on the downlink main signal of the proximal optical module according to the second top adjustment signal;

[0037] Converting the adjusted downlink main signal into the downlink optical signal;

[0038] Modifying the register value of the corresponding register in the remote optical module according to the received predetermined downlink optical signal includes:

[0039] Converting the predetermined downlink optical signal into a downlink electrical signal;

[0040] Extracting the second top adjustment signal from the downlink electrical signal;

[0041] Demodulating the second top modulation signal to obtain identification information of the second source register and a register value of the second source register;

[0042] Determine, according to the identification information, a register corresponding to the second source register as a second target register;

[0043] The register value of the second target register is modified to the register value of the second source register.

[0044] As a fifth aspect of the present disclosure, a remote optical module is provided, including:

[0045] A plurality of registers, used to respectively store various performance parameters of the remote optical module;

[0046] a remote signal processing unit, configured to generate an uplink optical signal according to identification information of the first source register and a register value of the first source register when at least one of the plurality of registers becomes a first source register, wherein the first source register is a register whose register value changes among the plurality of registers;

[0047] The remote signal transmission unit is used to transmit the uplink optical signal to the near-end optical module of the near-end node.

[0048] Optionally, the remote signal processing unit includes a remote micro control unit MCU, a remote top adjustment unit, and a remote optical transmitting unit TOSA;

[0049] The remote MCU is connected to the remote top adjustment unit and is used to generate a first top adjustment signal according to the identification information of the first source register and the register value of the first source register;

[0050] The remote top adjustment unit is connected to the remote TOSA and is used to adjust the uplink main signal of the remote optical module according to the first top adjustment signal;

[0051] The remote TOSA is used to convert the adjusted uplink main signal into the uplink optical signal.

[0052] Optionally, the remote signal processing unit is also used to modify the register value of the corresponding register among the multiple registers according to the received predetermined downlink optical signal, wherein the predetermined downlink optical signal is a downlink optical signal sent by the proximal optical module of the proximal node according to the control parameter transmission method described in the third aspect of the present disclosure.

[0053] Optionally, the remote signal processing unit further includes a remote optical receiving unit ROSA;

[0054] The remote ROSA is connected to the remote MCU and is used to convert the predetermined downlink optical signal into a downlink electrical signal and extract a second top adjustment signal from the downlink electrical signal;

[0055] The remote MCU is also used to demodulate the second modulation signal, obtain identification information of the second source register and the register value of the second source register, determine the register corresponding to the second source register as the second target register according to the identification information, and modify the register value of the second target register to the register value of the second source register, wherein the multiple mapping registers in the mapping register group of the proximal optical module correspond one-to-one to the multiple registers of the remote optical module, and the second source register is a mapping register whose register value changes among the multiple mapping registers.

[0056] As a sixth aspect of the present disclosure, a proximal optical module is provided, including:

[0057] A plurality of mapping registers, wherein the plurality of mapping registers correspond one-to-one to a plurality of registers of a remote optical module;

[0058] A proximal signal processing unit, configured to modify a register value of a corresponding mapping register of a proximal optical module of a proximal node according to a received predetermined uplink optical signal, wherein the predetermined uplink optical signal is an uplink optical signal sent by a remote optical module of a remote node according to the performance parameter transmission method according to the first aspect of the present disclosure;

[0059] The proximal determination unit is used to determine the operating state of the remote optical module according to the modified register value of the mapping register.

[0060] Optionally, the proximal signal processing unit includes a proximal MCU and a proximal ROSA;

[0061] The proximal ROSA is connected to the proximal MCU and is used to convert the predetermined uplink optical signal into an uplink electrical signal and extract the first top adjustment signal from the uplink electrical signal;

[0062] The proximal MCU is used to demodulate the first top modulation signal, obtain identification information of the first source register and the register value of the first source register, determine a mapping register corresponding to the first source register according to the identification information as the first target register, and modify the register value of the first target register to the corresponding register value of the first source register, wherein the first source register is a register whose register value changes among multiple registers of the remote optical module.

[0063] Optionally, the proximal optical module further includes a proximal signal transmission unit;

[0064] The proximal signal processing unit is further configured to generate a downlink optical signal according to identification information of the second source register and a register value of the second source register when at least one of the mapping registers becomes a second source register, wherein the second source register is a mapping register whose register value changes among the plurality of mapping registers, and a mapping relationship exists between the register value of each of the mapping registers and each control parameter of the remote optical module;

[0065] The near-end signal transmission unit is used to transmit the downlink optical signal to the far-end optical module.

[0066] Optionally, the proximal signal processing unit further includes a proximal top adjustment unit and a proximal TOSA;

[0067] The near-end MCU is further configured to generate a second top adjustment signal according to the identification information of the second source register and the register value of the second source register;

[0068] The proximal top adjustment unit is connected to the proximal MCU and is used to adjust the downlink main signal of the proximal optical module according to the second top adjustment signal;

[0069] The proximal TOSA is connected to the proximal top modulation unit and is used for converting the top-modulated downlink main signal into the downlink optical signal.

[0070] As a seventh aspect of the present disclosure, a fronthaul system is provided, comprising a proximal node and a distal node, wherein the proximal node comprises the proximal optical module described in the sixth aspect of the present disclosure, and the distal node comprises the distal optical module described in the fifth aspect of the present disclosure.

[0071] The present disclosure sets a plurality of mapping registers in a proximal optical module, and the plurality of mapping registers correspond one-to-one to the plurality of registers of a remote optical module. When the register value of at least one mapping register in the proximal optical module changes, the register value of the corresponding register in the remote optical module is synchronously modified, thereby realizing remote control of the remote optical module of the remote node by the proximal node; when the register value of at least one register in the remote optical module changes, the register value of the corresponding mapping register in the proximal optical module is synchronously modified, thereby realizing monitoring of the performance of the remote optical module of the remote node by the proximal node. BRIEF DESCRIPTION OF THE DRAWINGS

[0072] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention but do not constitute a limitation of the present invention. In the accompanying drawings:

[0073] Figure 1 is a flow chart of an implementation of the performance parameter transmission method provided by the present disclosure;

[0074] Figure 2 is a flow chart of another implementation of the performance parameter transmission method provided by the present disclosure;

[0075] Figure 3 It is a schematic diagram of the top adjustment principle;

[0076] Figure 4 is a flow chart of an implementation of the detection method provided by the present disclosure;

[0077] Figure 5 is a schematic diagram of register mapping in the present disclosure;

[0078] Figure 6 is a flow chart of another embodiment of the detection method provided by the present disclosure;

[0079] Figure 7 is a flow chart of an implementation of a control parameter transmission method provided by the present disclosure;

[0080] Figure 8 is a flow chart of another implementation of the control parameter transmission method provided by the present disclosure;

[0081] Fig. 9 is a flow chart of an implementation of the control method provided by the present disclosure;

[0082] Fig.10 is a flow chart of another implementation of the control method provided by the present disclosure;

[0083] Fig.11 is a module schematic diagram of an implementation mode of a remote optical module provided by the present disclosure;

[0084] Fig.12 is a module schematic diagram of an implementation of a proximal optical module provided by the present disclosure;

[0085] Fig.13 is a schematic diagram of another embodiment of the remote optical module provided by the present disclosure;

[0086] Fig.14 is a schematic diagram of another embodiment of the proximal optical module provided by the present disclosure;

[0087] Fig.15 It is a schematic diagram of an implementation of a fronthaul system provided by the present disclosure. DETAILED DESCRIPTION

[0088] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0089] In the 4G distributed base station system, the BBU is usually configured in the main base station or the central office (CO) room, and the RRU is pulled away to the antenna end through optical fiber, wherein the fronthaul system is between the BBU and the RRU; in the 5G network architecture, the CU and DU are deployed together in the main base station or the CO room, the AAU is distributed and deployed at the site, and the DU and the AAU are connected by the eCPRI interface to form the fronthaul system. The inventor of the present disclosure has found that in the fronthaul system of the related technology, the RRU or AAU is pulled away through optical fiber, and the optical module on the RRU side or the optical module on the AAU side lacks remote monitoring means. When the fronthaul system fails, manual maintenance is required to determine whether the optical module on the RRU side or the optical module on the AAU side is faulty. Therefore, it is impossible to predict the performance of the optical module on the RRU side or the optical module on the AAU side, and it is impossible to replace the optical module in time when the performance of the optical module deteriorates, and actively avoid the service failure of the fronthaul system caused by the failure of the optical module on the RRU side or the optical module on the AAU side.

[0090] Optical modules are optoelectronic devices that perform photoelectric and electro-optical conversions and have a limited service life. Generally, the service life of an optical module is about 5 years. During use, as the operating time increases, the performance of the optical module will gradually deteriorate. For example, as the operating time increases, the quantum efficiency of the laser that emits the laser in the optical module will decrease, resulting in the performance degradation of the optical module. In addition, the optical module may also fail due to environmental influences. For example, contamination and damage to the optical interface of the optical module may cause the optical link loss to increase, resulting in the optical link being blocked; dry environment or improper operation may also make the optical module susceptible to electrostatic discharge (ESD) damage, resulting in changes in the performance of the optical module or failure.

[0091] In the optical module, the performance parameters characterizing the performance of the optical module are stored in the register of the optical module. It should be noted that the register is a small storage area in the optical module for storing data, and is a high-speed storage component with limited storage capacity. Each optical module includes multiple registers, and stores corresponding data according to different functions. In the present disclosure, the optical module includes multiple registers for storing the performance parameters of the optical module, which store different performance parameters respectively. It should be noted that the performance parameters in the optical module register change dynamically within a certain range. For example, the laser bias current is an important performance parameter in the optical module, and the electro-optical conversion efficiency of the laser in the optical module is negatively correlated with the change of ambient temperature. In order to ensure that the output power of the laser does not change with temperature, the laser bias current will increase at high temperature, and decrease at low temperature, and the change of the laser bias current will be reflected in real time as the change of the value of the register corresponding to the laser bias current. For example, the received optical power is another important performance parameter in the optical module. As the online operation time of the optical module increases, the wavelength of the laser will shift. The optical module is used with a multiplexer (MUX, Multiplexer) or a demultiplexer (DEMUX, DEMultiplexer). When the wavelength of the laser shifts beyond the passband of the MUX / DEMUX at the wavelength, the received optical power will gradually decrease. The change in the received optical power will also be reflected in real time as the change in the value of the register corresponding to the received optical power. It should also be noted that when the performance of the optical module changes, the underlying software inside the optical module will modify the value of the register corresponding to the performance parameter of the optical module in real time.

[0092] The inventors of the present disclosure have discovered that the monitoring of the performance of the optical module of the remote node (such as RRU or AAU) of the fronthaul system is mainly achieved by monitoring the performance parameters stored in the register of the remote optical module; if the performance parameters stored in the register of the remote optical module can be remotely monitored, remote monitoring of the remote optical module can be achieved.

[0093] In view of this, in the present disclosure, it is proposed that in addition to conventional registers, a mapping register group is also set in the proximal optical module of the proximal node (such as BBU or DU) of the fronthaul system. Among them, the mapping register group includes multiple mapping registers, and the multiple mapping registers correspond to the multiple registers of the remote optical module of the remote node one by one, and the corresponding mapping registers and the registers of the remote optical module are set to the same register value. Therefore, when the register value of the register storing the performance parameters of the remote optical module in the remote optical module changes, if the register value of the corresponding mapping register in the proximal optical module can be modified synchronously, the proximal node can monitor the performance of the optical module of the remote node.

[0094] In view of this, as a first aspect of the present disclosure, a method for transmitting performance parameters of a remote optical module of a remote node is provided, such as Figure 1 As shown, the performance parameter transmission method includes:

[0095] In step S110, when at least one of the multiple registers of the remote optical module becomes a first source register, an uplink optical signal is generated according to the identification information of the first source register and the register value of the first source register, wherein the first source register is a register whose register value changes among the multiple registers, and there is a mapping relationship between the register value of each register and each performance parameter of the remote optical module;

[0096] In step S120, the uplink optical signal is transmitted to a proximal optical module of a proximal node.

[0097] The performance parameter transmission method is executed by a remote node. In order to synchronously modify the register value of the mapping register of the near-end optical module, in step S110 of the performance parameter transmission method, for the convenience of description, the register whose register value changes among the multiple registers of the remote optical module is called the first source register, and when at least one of the multiple registers of the remote optical module becomes the first source register, an uplink optical signal is generated according to the identification information of the first source register and the register value of the first source register. In step S120, the uplink optical signal is transmitted to the near-end optical module of the near-end node, thereby transmitting the identification information and the register value of the first source register to the near-end node.

[0098] After receiving the uplink optical signal, the proximal node determines the register identification information and the register value carried in the uplink optical signal, determines the mapping register corresponding to the first source register according to the register identification information, and modifies the register value of the corresponding mapping register to the register value of the first source register.

[0099] Since there is a mapping relationship between the register values ​​of each register of the remote optical module and each performance parameter of the remote optical module, the near-end optical module can determine the corresponding performance parameter of the remote optical module by reading the register value of its mapping register. In other words, through the performance parameter transmission method, the performance parameters of the remote optical module of the remote node can be obtained at the near-end node, the remote optical module can be remotely detected at the near-end node, and whether the optical module of the remote node fails can be determined in real time, which not only improves the efficiency of fault detection, but also reduces labor costs.

[0100] It should be noted that the present disclosure does not specifically limit the identification information of the register in the remote optical module. For example, the address of the register in the remote optical module can be used as the identification information of the register; the register of the remote optical module can also be numbered and the number can be used as the identification information of the register of the remote optical module.

[0101] It should be noted that according to the protocol, in the fronthaul system of the 4G network, the direction from BBU to RRU is called the downlink direction, and the direction from RRU to BBU is called the uplink direction; in the fronthaul system of the 5G network, the direction from DU to AAU is called the downlink direction, and the direction from AAU to DU is called the uplink direction. Therefore, in the 4G network architecture, the remote node of the fronthaul system is the RRU, and the near-end node is the BBU; in the 5G network architecture, the remote node of the fronthaul system is the AAU, and the near-end node is the CU or DU.

[0102] The present disclosure does not specifically limit how to generate the uplink optical signal. For example, the address of the first source register and the changed performance parameters of the remote optical module stored in the first source register can be loaded onto the uplink main signal of the optical module through subcarrier modulation to generate the uplink optical signal; the optical carrier signal carrying the identification information register value of the first source register can also be coupled with the main signal of the remote optical module through wavelength division multiplexing (WDM) to generate the uplink optical signal.

[0103] As an optional implementation, the identification information of the first source register and the register value of the first source register can be loaded onto the uplink main signal of the remote optical module through the top adjustment technology, thereby generating the uplink optical signal. In addition, in the optical module, information processing is completed in the electrical domain. When a signal needs to be sent, the information is first processed and loaded onto the electrical signal, and then the electrical signal is converted into an optical signal before it can be transmitted on the optical fiber. Accordingly, Figure 2 As shown, step S110 specifically includes the following steps:

[0104] In step S111, a first top adjustment signal is generated according to the identification information of the first source register and the register value of the first source register;

[0105] In step S112, the uplink main signal of the remote optical module is adjusted according to the first adjustment signal;

[0106] In step S113, the uplink main signal after the top adjustment is converted into the uplink optical signal.

[0107] It should be noted that the top modulation technology is to transform the waveform of the control signal to be transmitted, modulate it onto a suitable carrier as a top modulation signal, and further superimpose the top modulation signal on the main signal. Figure 3 The principle of top modulation is shown. The modulated control signal is transmitted to the receiving end together with the main signal through a common transmitting device. The control signal can be obtained at the receiving end through a low-pass filter and a demodulator, while the main signal is obtained through a high-pass filter. The top modulation signal can save optical transmission channels, and does not need to occupy the service segment or add additional specific wavelengths.

[0108] As an optional implementation manner, the top modulation signal is loaded onto the main signal of the optical module by means of subcarrier modulation, so as to implement top modulation of the uplink main signal of the remote optical module.

[0109] Subcarrier modulation refers to modulating the signal to be transmitted onto a radio frequency electric carrier, and then modulating the radio frequency electric carrier onto another carrier. In this embodiment, the identification information of the first source register and the register value of the first source register are modulated and loaded onto the radio frequency electric carrier to obtain the first top modulation signal; then the first top modulation signal is modulated and loaded onto the main signal of the optical module.

[0110] As a second aspect of the present disclosure, a detection method for detecting the performance of a remote optical module of the remote node is provided, such as Figure 4 As shown, the performance detection method includes:

[0111] In step S210, the register value of the corresponding mapping register in the mapping register group of the proximal optical module of the proximal node is modified according to the received predetermined uplink optical signal, wherein the predetermined uplink optical signal is an uplink optical signal sent by the remote optical module of the remote node according to the performance parameter transmission method described in the first aspect of the present disclosure, and the mapping register group includes a plurality of mapping registers, and the plurality of mapping registers correspond one-to-one to the plurality of registers of the remote optical module;

[0112] In step S220, the operating state of the remote optical module is determined according to the modified register value of the mapping register.

[0113] The performance detection method provided in the present disclosure is executed by the proximal node. As described above, in the present disclosure, a mapping register group is set in the proximal optical module of the proximal node of the fronthaul system, and the mapping register group includes multiple mapping registers, and the multiple mapping registers correspond to the registers in the remote optical module one by one, and the corresponding mapping registers have the same register value as the register of the remote optical module. Therefore, when the register value of at least one register in the remote optical module changes, the remote optical module will send the register value of the first source register and the register identifier of the first source register to the proximal module in the form of an uplink optical signal. When the proximal optical module of the proximal node receives the uplink optical signal transmitted by the remote optical module according to the performance parameter transmission method described in the first aspect of the present disclosure, the register value of the mapping register of the proximal optical module is updated according to the received uplink optical signal. After the update, a mapping relationship is established again between the register value of the mapping register of the mapping register group of the proximal optical module and the current performance parameters of the remote optical module. When the performance of the optical module of the remote node needs to be tested, in step 220, the operating state of the remote optical module can be determined by reading the register values ​​of each updated mapping register. The "operating state" here includes but is not limited to whether the remote module fails.

[0114] It should be noted that the one-to-one correspondence between the plurality of mapping registers and the plurality of registers of the remote optical module means that a mapping relationship is established between the plurality of mapping registers and the plurality of registers of the remote optical module. The two registers that are mapped to each other can locate the corresponding register through their own identification information. For example, in the remote optical module, the identification information of the mapping register in the near-end optical module can be used to locate the register in the remote optical module corresponding to the mapping register. And vice versa.

[0115] Figure 5 Schematic diagram of an implementation of the mapping relationship between the mapping register of the near-end optical module and the register of the far-end optical module. Figure 5 As shown, in the proximal optical module, in addition to the registers in the mapping register group shown, it also includes registers that an optical module should have under normal circumstances, which are used to store performance parameters, authentication information, wavelength information and other data of the proximal node's optical module.

[0116] exist Figure 5 In the implementation manner shown in , the identification information of the mapping register in the proximal optical module is the same as the identification information of the register corresponding to the mapping register in the distal optical module.

[0117] In the near-end optical module, the identification information of the mapping registers is Reg1, Reg2, Regx, ..., Regn. In the far-end optical module, the identification information of the registers is Reg1, Reg2, Regx, ..., Regn.

[0118] The mapping register with identification information Reg1 corresponds to the register with identification information Reg1 in the remote optical module, the mapping register with identification information Reg2 corresponds to the register with identification information Reg2 in the remote optical module, the mapping register with identification information Regx corresponds to the register with identification information Regx in the remote optical module, ..., the mapping register with identification information Regn corresponds to the register with identification information Regn in the remote optical module.

[0119] In the present disclosure, the mapping relationship between each mapping register of the proximal optical module and each register of the remote optical module may be stored in the proximal node in the form of a mapping table.

[0120] The present invention provides a method for detecting the performance of a remote optical module of a remote node. After receiving the identification information of a register sent by the remote optical module and the register value of the register that can characterize the performance of the optical module, the register value of the corresponding mapping register in the mapping register group of the proximal optical module is modified according to the register identification information and the register value. The performance of the remote optical module can then be detected by reading the register value of the mapping register, thereby realizing remote monitoring of the performance of the remote optical module of the remote node by the proximal node.

[0121] As mentioned above, in the optical module, information processing is completed in the electrical domain, and when an optical signal is received, the optical signal needs to be converted into an electrical signal. Therefore, in the present disclosure, when the optical module of the proximal node receives an uplink optical signal transmitted by the optical module of the distal node according to the performance parameter transmission method described in the first aspect of the present disclosure, the uplink optical signal needs to be converted into an uplink electrical signal first. In addition, when the uplink optical signal is generated using the modulation technology in the performance parameter transmission method described in the first aspect of the present disclosure, the proximal optical module also needs to demodulate the uplink electrical signal, and further demodulate it to obtain the identification information of the first source register and the register value of the first source register. Accordingly, Figure 6 As shown, step S210 further specifically includes:

[0122] In step S211, the predetermined uplink optical signal is converted into an uplink electrical signal;

[0123] In step S212, the first top adjustment signal is extracted from the uplink electrical signal;

[0124] In step S213, the first top modulation signal is demodulated to obtain identification information of the first source register and a register value of the first source register;

[0125] In step S214, a mapping register corresponding to the first source register is determined according to the identification information as a first target register;

[0126] In step S215 , the register value of the first target register is modified to the corresponding register value of the first source register.

[0127] As described above, each optical module includes a plurality of registers, and stores corresponding data according to different functions. In the present disclosure, the optical module also includes a plurality of registers for storing control parameters. The optical module performs corresponding operations according to the control parameters stored in the register to realize the corresponding functions. Therefore, the control of the functions of the optical module is to control the control parameters stored in the register of the optical module. If the control parameters stored in the register of the remote optical module can be remotely controlled, the remote control of the remote optical module can be realized. When a service failure occurs in the front transmission system, it can be determined whether the service failure is caused by the remote optical module by controlling the remote optical module to perform specific operations (for example, controlling the remote optical module to perform service loopback).

[0128] In view of this, as a third aspect of the present disclosure, a control parameter transmission method for controlling a remote optical module of a remote node is provided, such as Figure 7 As shown, the control parameter transmission method includes:

[0129] In step S310, when at least one mapping register in the mapping register group of the proximal optical module of the proximal node becomes the second source register, a downlink optical signal is generated according to the identification information of the second source register and the register value of the second source register, wherein a plurality of the mapping registers in the mapping register group correspond one-to-one to a plurality of registers in the remote optical module of the remote node, the second source register is a mapping register whose register value changes among the plurality of the mapping registers, and a mapping relationship exists between the register value of each of the mapping registers and each control parameter of the remote optical module;

[0130] In step S320, the downlink optical signal is transmitted to the remote optical module.

[0131] The control parameter transmission method is executed by the proximal node. In the present disclosure, the multiple registers of the remote optical module include multiple registers storing the control parameters of the remote optical module; accordingly, the mapping register group of the proximal optical module includes multiple mapping registers corresponding to the multiple registers storing the control parameters of the remote optical module. When it is necessary to control the remote optical module to perform a specific operation, the register value of the corresponding mapping register in the proximal optical module is first modified, and then the modified register value of the mapping register is transmitted to the remote optical module, so that the remote optical module modifies the register value corresponding to the mapping register to the register value of the mapping register, and the remote optical module can perform the specific operation according to the modified register value.

[0132] In the present disclosure, there is no special limitation on how to modify the register value of the mapping register. For example, the register value of the mapping register can be modified through an input device.

[0133] The one-to-one correspondence between the multiple mapping registers described in step S310 and the multiple registers in the remote optical module is the same as the one-to-one correspondence between the multiple mapping registers and the multiple registers in the remote optical module described in the second aspect of the present disclosure. The identification information of the registers has also been described in the previous text and will not be repeated here.

[0134] In the control parameter transmission method of the remote optical module for controlling the remote node provided by the present invention, when the remote optical module is required to perform a specific operation, the register value of the mapping register related to controlling the remote optical module in the proximal optical module is modified, and then the modified register value of the mapping register and the identification information of the mapping register are transmitted to the remote optical module, so that the remote optical module can modify the register value corresponding to the mapping register to the register value of the mapping register, so that the specific operation can be performed according to the modified register value, thereby realizing remote control of the remote optical module by the proximal optical module.

[0135] As an optional implementation, a top modulation technique is used when generating the downlink optical signal. The principle of the top modulation technique is not described in detail here. When generating the downlink optical signal, the electrical signal also needs to be converted into an optical signal. Figure 8 As shown, step S310 further specifically includes:

[0136] In step S311, a second top adjustment signal is generated according to the identification information of the second source register and the register value of the second source register;

[0137] In step S312, the downlink main signal of the near-end optical module is adjusted according to the second adjustment signal;

[0138] In step S313, the adjusted downlink main signal is converted into the downlink optical signal.

[0139] As a fourth aspect of the present disclosure, a method for controlling an optical module of a remote node is provided. Fig. 9 As shown, including:

[0140] In step S410, the register values ​​of the corresponding registers in the remote optical module are modified according to the received predetermined downlink optical signal, wherein the predetermined downlink optical signal is a downlink optical signal sent by the proximal optical module of the proximal node according to the control parameter transmission method described in the third aspect of the present disclosure, and there is a mapping relationship between the register values ​​of the respective registers of the remote optical module and the respective control parameters of the remote optical module.

[0141] After the register value of the corresponding register in the remote optical module is modified, the remote optical module can perform a specific operation according to the modified register value.

[0142] The control method of the remote optical module of the remote node provided by the present invention modifies the register value of the corresponding register in the remote optical module according to the register value and register identification information transmitted by the near-end optical module, so that the optical module of the near-end node can perform specific operations by reading the control parameters stored in the register, thereby realizing the remote control of the optical module of the remote node by the optical module of the near-end node.

[0143] As an optional implementation, Fig.10 As shown, step S410 further specifically includes:

[0144] In step S411, the predetermined downlink optical signal is converted into a downlink electrical signal;

[0145] In step S412, the second top adjustment signal is extracted from the downlink electrical signal;

[0146] In step S413, the second top modulation signal is demodulated to obtain identification information of the second source register and a register value of the second source register;

[0147] In step S414, a register corresponding to the second source register is determined as a second target register according to the identification information;

[0148] In step S415 , the register value of the second target register is modified to the register value of the second source register.

[0149] As a fifth aspect of the present disclosure, a remote optical module 100 is provided. Fig.11 As shown, including:

[0150] A plurality of registers 110, used to store the respective performance parameters of the remote optical module;

[0151] A remote signal processing unit 120, configured to generate an uplink optical signal according to identification information of the first source register and a register value of the first source register when at least one of the plurality of registers becomes a first source register, wherein the first source register is a register whose register value changes among the plurality of registers;

[0152] The remote signal transmission unit 130 is used to transmit the uplink optical signal to the near-end optical module of the near-end node.

[0153] As an optional implementation, Fig.13 As shown, the remote signal processing unit 120 includes a remote micro control unit MCU, a remote top adjustment unit, and a remote optical transmitter TOSA;

[0154] The remote MCU is connected to the remote top adjustment unit and is used to generate a first top adjustment signal according to the identification information of the first source register and the register value of the first source register;

[0155] The remote top adjustment unit is connected to the remote TOSA and is used to adjust the uplink main signal of the remote optical module according to the first top adjustment signal;

[0156] The remote TOSA is used to convert the adjusted uplink main signal into the uplink optical signal.

[0157] As an optional implementation, the remote optical module can also perform corresponding operations and implement specific functions according to the control parameters sent by the near-end optical module. Accordingly, the remote signal processing unit 120 is also used to modify the register value of the corresponding register in the multiple registers according to the received predetermined downlink optical signal, wherein the predetermined downlink optical signal is a downlink optical signal sent by the near-end optical module of the near-end node according to the control parameter transmission method described in the third aspect of the present disclosure, and there is a mapping relationship between the register value of each of the registers and the various control parameters of the remote optical module.

[0158] As an optional implementation, Fig.13 As shown, the remote signal processing unit 120 also includes a remote optical receiving unit ROSA;

[0159] The remote ROSA is connected to the remote MCU and is used to convert the predetermined downlink optical signal into a downlink electrical signal and extract a second top adjustment signal from the downlink electrical signal;

[0160] The remote MCU is also used to demodulate the second modulation signal, obtain identification information of the second source register and the register value of the second source register, determine the register corresponding to the second source register as the second target register according to the identification information, and modify the register value of the second target register to the register value of the second source register, wherein the multiple mapping registers in the mapping register group of the proximal optical module correspond one-to-one to the multiple registers of the remote optical module, and the second source register is a mapping register whose register value changes among the multiple mapping registers.

[0161] It should be noted that if Fig.13 As shown, in the present disclosure, the remote optical module also includes a remote clock and data recovery unit (CDR), and the remote CDR is connected to the remote top adjustment unit and the remote ROSA, and is used to perform code element synchronization processing on the main signal input to the remote optical module, that is, to extract the clock signal from the main signal input to the remote optical module and find the correct phase relationship between the data and the clock; in addition, the remote optical module also includes an optical interface and an electrical interface, and the remote optical module is connected to other components of the remote node through the electrical interface, and interacts with other components of the remote node through the electrical interface. Control signals and transmit main signals; the remote optical module is connected to the optical fiber through the optical interface, and establishes a connection with the proximal optical module of the proximal node.

[0162] The remote optical module described in the fifth aspect of the present disclosure is used to execute the performance parameter transmission method described in the first aspect of the present disclosure and the control method provided in the fourth aspect of the present disclosure. The performance parameter transmission method and the control method have been described in detail above and will not be repeated here.

[0163] As a sixth aspect of the present disclosure, a proximal optical module 200 is provided, such as Fig.12 As shown, including:

[0164] A plurality of mapping registers 210, wherein the plurality of mapping registers 210 correspond one-to-one to a plurality of registers of a remote optical module;

[0165] A proximal signal processing unit 220, configured to modify a register value of a corresponding mapping register of a proximal optical module of a proximal node according to a received predetermined uplink optical signal, wherein the predetermined uplink optical signal is an uplink optical signal sent by a remote optical module of a remote node according to the performance parameter transmission method according to the first aspect of the present disclosure;

[0166] The proximal determination unit 230 is configured to determine the operating state of the remote optical module according to the modified register value of the mapping register.

[0167] As an optional implementation, Fig.14 As shown, the proximal signal processing unit 220 includes a proximal MCU and a proximal ROSA;

[0168] The proximal ROSA is connected to the proximal MCU and is used to convert the predetermined uplink optical signal into an uplink electrical signal and extract the first top adjustment signal from the uplink electrical signal;

[0169] The proximal MCU is used to demodulate the first top modulation signal, obtain identification information of the first source register and the register value of the first source register, determine a mapping register corresponding to the first source register according to the identification information as the first target register, and modify the register value of the first target register to the corresponding register value of the first source register, wherein the first source register is a register whose register value changes among multiple registers of the remote optical module.

[0170] As an optional implementation, the near-end optical module can also transmit control parameters to the remote optical module of the remote node, thereby realizing remote control of the remote optical module. Fig.12 As shown, the proximal optical module 200 further includes a signal transmission unit 240;

[0171] The proximal signal processing unit 220 is further configured to generate a downlink optical signal according to the identification information of the second source register and the register value of the second source register when at least one of the mapping registers becomes a second source register, wherein the second source register is a mapping register whose register value changes among the plurality of mapping registers, and a mapping relationship exists between the register value of each mapping register and each control parameter of the remote optical module;

[0172] The near-end signal transmission unit 240 is used to transmit the downlink optical signal to the far-end optical module.

[0173] As an optional implementation, Fig.14 As shown, the proximal signal processing unit also includes a proximal top adjustment unit and a proximal TOSA;

[0174] The near-end MCU is further configured to generate a second top adjustment signal according to the identification information of the second source register and the register value of the second source register;

[0175] The proximal top adjustment unit is connected to the proximal MCU and is used to adjust the downlink main signal of the proximal optical module according to the second top adjustment signal;

[0176] The proximal TOSA is connected to the proximal top modulation unit and is used for converting the top-modulated downlink main signal into the downlink optical signal.

[0177] It should be noted that if Fig.14 As shown, in the present disclosure, the proximal optical module also includes a proximal CDR, which is connected to the proximal top adjustment unit and the proximal ROSA, and is used to perform code element synchronization processing on the main signal input to the proximal optical module, that is, to extract the clock signal from the main signal input to the proximal optical module and find the correct phase relationship between the data and the clock; in addition, the proximal optical module also includes an optical interface and an electrical interface, and the proximal optical module is connected to other components of the proximal node through the electrical interface, and interacts with other components of the proximal node through the electrical interface. Control signals and transmit main signals; the proximal optical module is connected to the optical fiber through the optical interface, and establishes a connection with the remote optical module of the remote node.

[0178] The proximal optical module described in the sixth aspect of the present disclosure is used to execute the detection method described in the second aspect of the present disclosure and the control parameter transmission method provided in the third aspect of the present disclosure. The detection method and the control parameter transmission method have been described in detail above and will not be repeated here.

[0179] As a seventh aspect of the present disclosure, a fronthaul system is provided, comprising a proximal node and a distal node, wherein the proximal node comprises the proximal optical module described in the sixth aspect of the present disclosure, and the distal node comprises the distal optical module described in the fifth aspect of the present disclosure.

[0180] Fig.15 FIG. 1 is a schematic diagram showing an implementation of a forward transmission system according to the seventh aspect of the present disclosure. Fig.15 As shown, in the fronthaul system, the proximal TOSA of the proximal optical module is connected to the distal ROSA of the distal optical module through an optical fiber, and the proximal ROSA of the proximal optical module is connected to the distal TOSA of the distal optical module.

[0181] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present invention, but the present invention is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A method for transmitting performance parameters of a remote optical module of a remote node, comprising: When at least one of the multiple registers of the remote optical module becomes a first source register, an uplink optical signal is generated according to the identification information of the first source register and the register value of the first source register, wherein the first source register is a register whose register value changes among the multiple registers, and there is a mapping relationship between the register value of each register and each performance parameter of the remote optical module; Transmitting the uplink optical signal to a proximal optical module of a proximal node; The uplink optical signal is used to modify the register value of the corresponding mapping register in the mapping register group of the proximal optical module of the proximal node, and the uplink optical signal carries the identification information of the first source register and the register value of the first source register.

2. The performance parameter transmission method according to claim 1, wherein: Generating an uplink optical signal according to the identification information of the first source register and the register value of the first source register includes: generating a first top adjustment signal according to the identification information of the first source register and the register value of the first source register; Performing top adjustment on the uplink main signal of the remote optical module according to the first top adjustment signal; The adjusted uplink main signal is converted into the uplink optical signal.

3. A method for detecting the performance of a remote optical module of a remote node, comprising: Modify the register value of the corresponding mapping register in the mapping register group of the proximal optical module of the proximal node according to the received predetermined uplink optical signal, wherein the predetermined uplink optical signal is an uplink optical signal sent by the remote optical module of the remote node according to the performance parameter transmission method according to claim 1 or 2, and the mapping register group includes a plurality of the mapping registers, and the plurality of the mapping registers correspond one-to-one to the plurality of registers of the remote optical module; The operating state of the remote optical module is determined according to the modified register value of the mapping register.

4. The detection method according to claim 3, wherein: The step of generating the uplink optical signal by the remote optical module comprises: Generate a first adjustment signal according to identification information of a first source register and a register value of the first source register, wherein the first source register is a register whose register value changes among multiple registers of the remote optical module; Performing top adjustment on the uplink main signal of the remote optical module according to the first top adjustment signal; Converting the adjusted uplink main signal into the uplink optical signal; Modifying the register value of the corresponding mapping register in the mapping register group of the proximal optical module of the proximal node according to the received predetermined uplink optical signal includes: Converting the predetermined uplink optical signal into an uplink electrical signal; Extracting the first top adjustment signal from the uplink electrical signal; Demodulating the first top modulation signal to obtain identification information of the first source register and a register value of the first source register; Determine, according to the identification information, a mapping register corresponding to the first source register as a first target register; The register value of the first target register is modified to the corresponding register value of the first source register.

5. A method for transmitting control parameters of a remote optical module for controlling a remote node, comprising: When at least one mapping register in the mapping register group of the proximal optical module of the proximal node becomes a second source register, a downlink optical signal is generated according to the identification information of the second source register and the register value of the second source register, wherein the plurality of mapping registers in the mapping register group correspond one-to-one to the plurality of registers in the remote optical module of the remote node, the second source register is a mapping register whose register value changes among the plurality of mapping registers, and a mapping relationship exists between the register value of each mapping register and each control parameter of the remote optical module; Transmitting the downlink optical signal to the remote optical module; The downlink optical signal is used to modify the register value of the corresponding register in the remote optical module, and the downlink optical signal carries the identification information of the second source register and the register value of the second source register.

6. The control parameter transmission method according to claim 5, wherein: Generating a downlink optical signal according to the identification information of the second source register and the register value of the second source register includes: generating a second top adjustment signal according to the identification information of the second source register and the register value of the second source register; Performing top adjustment on the downlink main signal of the proximal optical module according to the second top adjustment signal; The adjusted downlink main signal is converted into the downlink optical signal.

7. A method for controlling a remote optical module of a remote node, comprising: The register values ​​of corresponding registers in the remote optical module are modified according to the received predetermined downlink optical signal, wherein the predetermined downlink optical signal is a downlink optical signal sent by the proximal optical module of the proximal node according to the control parameter transmission method according to claim 5 or 6, and there is a mapping relationship between the register values ​​of each register of the remote optical module and the various control parameters of the remote optical module.

8. The control method according to claim 7, wherein: The step of generating the downlink optical signal by the proximal optical module comprises: Generate a second top adjustment signal according to the identification information of the second source register and the register value of the second source register, wherein the plurality of mapping registers in the mapping register group of the proximal optical module correspond one-to-one to the plurality of registers of the remote optical module, and the second source register is a mapping register whose register value changes among the plurality of mapping registers; Performing top adjustment on the downlink main signal of the proximal optical module according to the second top adjustment signal; Converting the adjusted downlink main signal into the downlink optical signal; Modifying the register value of the corresponding register in the remote optical module according to the received predetermined downlink optical signal includes: Converting the predetermined downlink optical signal into a downlink electrical signal; Extracting the second top adjustment signal from the downlink electrical signal; Demodulating the second top modulation signal to obtain identification information of the second source register and a register value of the second source register; Determine, according to the identification information, a register corresponding to the second source register as a second target register; The register value of the second target register is modified to the register value of the second source register.

9. A remote optical module, comprising: A plurality of registers, used to respectively store various performance parameters of the remote optical module; a remote signal processing unit, configured to generate an uplink optical signal according to identification information of the first source register and a register value of the first source register when at least one of the plurality of registers becomes a first source register, wherein the first source register is a register whose register value changes among the plurality of registers; A remote signal transmission unit, used for transmitting the uplink optical signal to a near-end optical module of a near-end node; The uplink optical signal is used to modify the register value of the corresponding mapping register in the mapping register group of the proximal optical module of the proximal node, and the uplink optical signal carries the identification information of the first source register and the register value of the first source register.

10. The remote optical module according to claim 9, wherein: The remote signal processing unit includes a remote micro control unit MCU, a remote top adjustment unit, and a remote optical transmitting unit TOSA; The remote MCU is connected to the remote top adjustment unit and is used to generate a first top adjustment signal according to the identification information of the first source register and the register value of the first source register; The remote top adjustment unit is connected to the remote TOSA and is used to adjust the uplink main signal of the remote optical module according to the first top adjustment signal; The remote TOSA is used to convert the adjusted uplink main signal into the uplink optical signal.

11. The remote optical module according to claim 10, wherein: The remote signal processing unit is further used to modify the register value of the corresponding register among the multiple registers according to the received predetermined downlink optical signal, wherein the predetermined downlink optical signal is a downlink optical signal sent by the proximal optical module of the proximal node according to the control parameter transmission method according to claim 5 or 6.

12. The remote optical module according to claim 11, wherein: The remote signal processing unit also includes a remote optical receiving unit ROSA; The remote ROSA is connected to the remote MCU and is used to convert the predetermined downlink optical signal into a downlink electrical signal and extract a second top adjustment signal from the downlink electrical signal; The remote MCU is also used to demodulate the second modulation signal, obtain identification information of the second source register and the register value of the second source register, determine the register corresponding to the second source register as the second target register according to the identification information, and modify the register value of the second target register to the register value of the second source register, wherein the multiple mapping registers in the mapping register group of the proximal optical module correspond one-to-one to the multiple registers of the remote optical module, and the second source register is a mapping register whose register value changes among the multiple mapping registers.

13. A proximal optical module, comprising: A plurality of mapping registers, wherein the plurality of mapping registers correspond one-to-one to a plurality of registers of a remote optical module; A proximal signal processing unit, configured to modify a register value of a corresponding mapping register of a proximal optical module of a proximal node according to a received predetermined uplink optical signal, wherein the predetermined uplink optical signal is an uplink optical signal sent by a remote optical module of a remote node according to the performance parameter transmission method according to claim 1 or 2; The proximal determination unit is used to determine the operating state of the remote optical module according to the modified register value of the mapping register.

14. The proximal optical module according to claim 13, wherein: The proximal signal processing unit includes a proximal MCU and a proximal ROSA; The proximal ROSA is connected to the proximal MCU, and is used to convert the predetermined uplink optical signal into an uplink electrical signal, and extract the first top adjustment signal from the uplink electrical signal; wherein the predetermined uplink optical signal is an uplink optical signal sent by the remote optical module of the remote node according to the performance parameter transmission method according to claim 2; The proximal MCU is used to demodulate the first top modulation signal, obtain identification information of the first source register and the register value of the first source register, determine a mapping register corresponding to the first source register according to the identification information as the first target register, and modify the register value of the first target register to the corresponding register value of the first source register, wherein the first source register is a register whose register value changes among multiple registers of the remote optical module.

15. The proximal optical module according to claim 14, wherein: The proximal optical module also includes a proximal signal transmission unit; The proximal signal processing unit is further configured to generate a downlink optical signal according to identification information of the second source register and a register value of the second source register when at least one of the mapping registers becomes a second source register, wherein the second source register is a mapping register whose register value changes among the plurality of mapping registers, and a mapping relationship exists between the register value of each of the mapping registers and each control parameter of the remote optical module; The near-end signal transmission unit is used to transmit the downlink optical signal to the far-end optical module; The downlink optical signal is used to modify the register value of the corresponding register in the remote optical module, and the downlink optical signal carries the identification information of the second source register and the register value of the second source register.

16. The proximal optical module according to claim 15, wherein: The proximal signal processing unit also includes a proximal top adjustment unit and a proximal TOSA; The proximal MCU is further configured to generate a second top adjustment signal according to the identification information of the second source register and the register value of the second source register; The proximal top adjustment unit is connected to the proximal MCU and is used to adjust the downlink main signal of the proximal optical module according to the second top adjustment signal; The proximal TOSA is connected to the proximal top modulation unit and is used for converting the top-modulated downlink main signal into the downlink optical signal.

17. A fronthaul system, comprising a near-end node and a far-end node, wherein: The proximal node comprises the proximal optical module according to any one of claims 13 to 16, and the remote node comprises the remote optical module according to any one of claims 9 to 12.

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