A multi-frequency multi-path analog light distribution system and a control method thereof

Abstract

The application provides a multi-frequency multi-path analog optical distribution system and a control method thereof. The method comprises the following steps: processing and modulating a obtained air interface multi-frequency band radio frequency signal to obtain a target multi-frequency band radio frequency signal and an amplitude shift keying signal; combining and converting the target multi-frequency band radio frequency signal and the amplitude shift keying signal to obtain an initial multi-frequency band optical signal, and adjusting and temperature compensating the multi-frequency band optical signal to obtain a target multi-frequency band optical signal; photoelectrically converting the target multi-frequency band optical signal to obtain a target multi-frequency band radio frequency signal and an amplitude shift keying signal, gain compensating the target multi-frequency band radio frequency signal, and analyzing and restoring the amplitude shift keying signal to obtain a gain radio frequency signal and an uplink / downlink switching control level, respectively. The application improves the stability of multi-frequency band signal transmission, efficiently utilizes communication resources according to business needs, and effectively improves the technical effect of poor communication coverage.

Description

Technical Field

[0001] This invention relates to the field of communication technology, and in particular to a multi-frequency, multi-path analog optical distribution system and its control method. Background Technology

[0002] With the rapid development of emerging communication services such as mobile Internet and Internet of Things, users have put forward higher requirements for the bandwidth, speed and coverage of mobile communication services. In order to meet this demand, communication operators are constantly expanding communication frequency band resources. Multi-frequency band collaborative networking such as 2G, 4G and 5G has become the mainstream communication mode. Multi-frequency multi-path optical distribution systems are core signal coverage equipment in scenarios such as indoor spaces, underground parking lots and large industrial parks, and their application scope is becoming more and more extensive.

[0003] While existing analog optical distribution systems can achieve photoelectric conversion, transmission, and coverage of multi-band radio frequency signals, interference between different bands becomes increasingly severe as the number of bands increases. For example, in densely populated urban areas, due to the intensive use of frequency bands, interference frequently occurs between different operators and between different bands of the same operator, leading to signal instability in some areas. Furthermore, the lack of flexibility in signal allocation and management, failing to dynamically adjust according to actual user distribution and service needs, results in inefficient use of communication resources and further exacerbates the problem of poor communication coverage. Summary of the Invention

[0004] This invention provides a multi-frequency, multi-path analog optical distribution system and its control method, which solves the technical problems of severe interference between multiple frequency bands, lack of flexibility in signal allocation and management, and inability to dynamically adjust according to actual needs. It achieves improved stability of multi-frequency signal transmission, enables efficient utilization of communication resources according to service needs, and effectively improves the technical effect of poor communication coverage.

[0005] In a first aspect, the present invention provides a multi-frequency, multi-path analog optical distribution system, comprising: The system comprises an access unit, a coverage unit, and a central control unit. The access unit includes an access unit radio frequency module and an access unit optical transmission module. The coverage unit includes a coverage unit optical reception module and a coverage unit radio frequency module. The central control unit is connected to the access unit radio frequency module, the access unit optical transmission module, the coverage unit optical reception module, and the coverage unit radio frequency module, and manages each module. The access unit radio frequency module is used to process and modulate the acquired air interface multi-band radio frequency signals to obtain the target multi-band radio frequency signals and amplitude shift keying signals; The access unit optical transmission module is used to perform combining and conversion based on the target multi-band radio frequency signal and amplitude shift keying signal to obtain an initial multi-band optical signal, and to adjust and temperature compensate the multi-band optical signal to obtain the target multi-band optical signal; The coverage unit optical receiver module is used to perform photoelectric conversion based on the target multi-band optical signal to obtain the target multi-band radio frequency signal and amplitude shift keying signal. It also performs gain compensation on the target multi-band radio frequency signal and analyzes and restores the amplitude shift keying signal to obtain the gain radio frequency signal and uplink / downlink switching control level, respectively. The coverage unit RF module is connected to perform time slot switching between the uplink and downlink of the RF circuit based on the uplink and downlink switching control level. When the downlink is activated, the gain-based RF signal is pre-processed and transmitted to the coverage area by the coverage antenna. When the uplink is activated, the uplink RF signal transmitted by the terminal in the coverage area is pre-processed and transmitted back.

[0006] In a second aspect, the present invention also provides a control method for a multi-frequency, multi-path analog optical distribution system, applied to the multi-frequency, multi-path analog optical distribution system as described in the first aspect; the control method for the multi-frequency, multi-path analog optical distribution system includes: The acquired air interface multi-band radio frequency signals are processed and modulated to obtain the target multi-band radio frequency signals and amplitude shift keying signals; The initial multi-band optical signal is obtained by combining the target multi-band radio frequency signal and the amplitude shift keying signal. The multi-band optical signal is then adjusted and temperature compensated to obtain the target multi-band optical signal. Photoelectric conversion is performed on the target multi-band optical signal to obtain the target multi-band radio frequency signal and amplitude shift keying signal. Gain compensation is performed on the target multi-band radio frequency signal and the amplitude shift keying signal is analyzed and restored to obtain the gain radio frequency signal and the uplink / downlink switching control level, respectively. Based on the uplink and downlink switching control level, the uplink and downlink of the radio frequency circuit are time-slot switched. When the downlink is activated, the gain-based radio frequency signal is pre-processed and then transmitted to the coverage area by the coverage antenna. When the uplink is activated, the uplink radio frequency signal transmitted by the terminal in the coverage area is pre-processed and then transmitted back.

[0007] Thirdly, the present invention also provides an electronic device, comprising: a memory for storing computer software programs; and a processor for reading and executing the computer software programs, thereby realizing the control method of the multi-frequency multi-channel analog optical distribution system as described above.

[0008] Fourthly, the present invention also provides a non-transitory computer-readable storage medium storing a computer software program, which, when executed by a processor, implements the control method of the multi-frequency multi-channel analog optical distribution system described above.

[0009] Fifthly, the present invention also provides a computer program product, including a computer program that, when executed by a processor, implements the control method for the multi-frequency multi-channel analog optical distribution system as described above.

[0010] The multi-frequency, multi-path analog optical distribution system provided in this invention obtains target multi-frequency radio frequency signals and amplitude shift keying (APS) signals by processing and modulating air interface multi-band radio frequency signals through the access unit's radio frequency module. Based on this result, it achieves precise processing of multi-band radio frequency signals and synchronous generation of control signals, enabling multi-band service signals and time slot switching control signals to form a compatible signal combination. Based on this signal combination, the access unit's optical transmission module can combine and convert the two signals to obtain an initial multi-band optical signal. After adjustment and temperature compensation, a stable target multi-band optical signal is obtained. Based on this stable target multi-band optical signal, integrated transmission of multi-band radio frequency signals and control signals is achieved, while avoiding transmission instability caused by environmental factors. The integrated transmission signal form allows the coverage unit's optical receiving module to simultaneously complete photoelectric conversion to obtain the corresponding target multi-band radio frequency signals and amplitude shift keying (APS) signals. The keying signal, based on gain compensation of the target multi-band RF signal and analysis and restoration of the amplitude shift keying signal, yields the gain RF signal and uplink / downlink switching control level, respectively. The gain RF signal ensures the signal strength of the multi-band RF signal after transmission, while the uplink / downlink switching control level enables the coverage unit RF module to achieve precise time slot switching between the uplink and downlink of the RF circuit. Based on this precise time slot switching, time slot management of uplink and downlink transmission of multi-band RF signals is realized. Ultimately, the entire process from signal processing, transmission to transmission and backhaul achieves precise control and dynamic adaptation of multi-band signals, solving the technical problems of severe interference between multi-bands, lack of flexibility in signal allocation and management, and inability to dynamically adjust according to actual needs. This improves the stability of multi-band signal transmission, allows for efficient use of communication resources according to service requirements, and effectively improves the technical effect of poor communication coverage. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of the multi-frequency, multi-path analog optical distribution system provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the control method for a multi-frequency, multi-path analog optical distribution system provided in an embodiment of the present invention; Figure 3 An embodiment diagram of the electronic device provided in this invention; Figure 4 An embodiment diagram of a computer-readable storage medium provided in accordance with the present invention; Figure 5 This is a flowchart of the automatic gain control process for the optical link of a multi-frequency, multi-path analog optical distribution system provided in an embodiment of the present invention. Figure 6 The flowchart of the access unit optical transmission module execution of the control method for a multi-frequency multi-channel analog optical distribution system provided in this embodiment of the invention; Figure 7 The time slot switching control diagram is provided for the control method of the multi-frequency multi-channel analog optical distribution system provided in the embodiment of the present invention. Detailed Implementation

[0012] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0013] In the description of this invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0014] In the description of this invention, the term "for example" is used to mean "used as an example, illustration, or description." Any embodiment described as "for example" in this invention is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is provided to enable any person skilled in the art to make and use the invention. Details are set forth in the following description for purposes of explanation. It should be understood that those skilled in the art will recognize that the invention can be made without using these specific details. In other instances, well-known structures and processes will not be described in detail to avoid obscuring the description of the invention with unnecessary detail. Therefore, the invention is not intended to be limited to the embodiments shown, but is consistent with the broadest scope of the principles and features disclosed herein.

[0015] See Figure 1 , Figure 1This is a schematic diagram of the structure of the multi-frequency, multi-path analog optical distribution system provided by the present invention. The multi-frequency, multi-path analog optical distribution system includes: an access unit, a coverage unit, and a central control unit. The access unit includes an access unit radio frequency module and an access unit optical transmission module. The coverage unit includes a coverage unit optical reception module and a coverage unit radio frequency module. The central control unit is connected to the access unit radio frequency module, the access unit optical transmission module, the coverage unit optical reception module, and the coverage unit radio frequency module, respectively, and manages each module. It also includes an optical transmission link connecting the access unit and the coverage unit, wherein the optical transmission link is optically connected to the access unit optical transmission module and the coverage unit optical reception module, respectively.

[0016] Optionally, the simulated optical distribution system completes the physical and electrical connections between the access unit, coverage unit, central control unit, and optical transmission link, establishing signal transmission and command interaction channels between the modules. The central control unit serves as the core control and data processing center of the system. The access unit's RF module and optical transmitter module are electrically connected to the central control unit, as are the coverage unit's optical receiver module and RF module. The input of the optical transmission link is optically connected to the access unit's optical transmitter module, and the output is optically connected to the coverage unit's optical receiver module. The optical power divider in the optical transmission link establishes the channel for splitting and transmitting optical signals. After each module is powered on and enters normal operation, the central control unit is loaded with preset threshold values ​​for various parameters, including optical transmit power threshold, optical receive power threshold, laser operating current threshold, and ambient temperature compensation reference value, for subsequent signal processing and control.

[0017] In one embodiment, it is assumed that a multi-frequency, multi-path analog optical distribution system is deployed in a large industrial park. The system consists of 2 access units, 8 coverage units, and a central control unit connected to all access units and coverage units via wired electrical connections. Each access unit's optical transmission module is connected to a 1-to-4 optical power divider, and the four outputs of the optical power divider are connected to the optical receiving modules of the four coverage units via optical fibers. After power-on, each module performs a self-test without faults, and the central control unit loads preset parameters: optical transmission power threshold of 3 dBmW ± 0.5 dBmW, optical receiving power threshold of -7 dBmW ± 0.5 dBmW, laser operating current reference value of 200 mA, and temperature compensation step of adjusting the drive current by 3 mA every 10 degrees Celsius.

[0018] The access unit radio frequency module is used to process and modulate the acquired air interface multi-band radio frequency signals to obtain the target multi-band radio frequency signals and amplitude shift keying signals.

[0019] Optionally, the access unit radio frequency module is electrically connected to the base station air interface signal terminal and the access unit optical transmission module, respectively. After the access unit radio frequency module acquires the air interface multi-band radio frequency signal, it obtains the target multi-band radio frequency signal that can be converted by photoelectric conversion through a series of operations such as frequency band processing, interference filtering, signal amplification, synchronous analysis and modulation. At the same time, it generates an amplitude shift keying signal containing 5G new air interface signal uplink and downlink switching information to complete the signal preprocessing and modulation preparation.

[0020] The access unit optical transmission module is used to perform combining and conversion based on the target multi-band radio frequency signal and amplitude shift keying signal to obtain the initial multi-band optical signal, and to adjust and temperature compensate the multi-band optical signal to obtain the target multi-band optical signal.

[0021] Optionally, the optical transmission module of the access unit is electrically connected to the radio frequency module of the access unit, the optical transmission link, and the central control unit, respectively. The optical transmission module of the access unit receives the target multi-band radio frequency signal and amplitude shift keying signal output by the radio frequency module of the access unit. It combines the two signals into one electrical signal through a signal combiner, and then converts the combined electrical signal into an initial multi-band optical signal through a photoelectric conversion circuit. Subsequently, the optical transmission power of the initial multi-band optical signal is automatically adjusted, and temperature compensation of the laser operating current is performed according to changes in ambient temperature. Finally, a target multi-band optical signal with stable power and meeting transmission requirements is obtained, completing the preparation for optical signal transmission.

[0022] The coverage unit optical receiver module is used to perform photoelectric conversion based on the target multi-band optical signal to obtain the target multi-band radio frequency signal and amplitude shift keying signal. It also performs gain compensation on the target multi-band radio frequency signal and analyzes and restores the amplitude shift keying signal to obtain the gain radio frequency signal and uplink / downlink switching control level, respectively.

[0023] Optionally, the coverage unit optical receiver module is electrically connected to the optical transmission link, the coverage unit radio frequency module, and the central control unit, respectively. The coverage unit optical receiver module receives the target multi-band optical signal transmitted via the optical transmission link, converts the optical signal back into an electrical signal through a photoelectric conversion circuit, and separates the target multi-band radio frequency signal and amplitude shift keying signal to prepare for subsequent gain compensation and signal analysis. At the same time, the coverage unit optical receiver module performs automatic gain control compensation on the target multi-band radio frequency signal obtained after photoelectric conversion, and analyzes and restores the amplitude shift keying signal obtained after photoelectric conversion to obtain the uplink and downlink switching control level containing 5G New Radio signal uplink and downlink switching information.

[0024] The coverage unit RF module is connected to perform time slot switching between the uplink and downlink of the RF circuit based on the uplink and downlink switching control level. When the downlink is activated, the gain-based RF signal is pre-processed and transmitted to the coverage area by the coverage antenna. When the uplink is activated, the uplink RF signal transmitted by the terminal in the coverage area is pre-processed and transmitted back.

[0025] Optionally, the coverage unit RF module is electrically connected to the coverage unit optical receiver module and the coverage area antenna, respectively. The coverage unit RF module receives the uplink / downlink switching control level output by the coverage unit optical receiver module, and performs time-division duplex time-slot switching of the RF circuit uplink and downlink based on the control level. Time-division duplex time-slot switching refers to switching the RF circuit to the corresponding uplink or downlink operating state in different time domains according to the time-slot allocation rules of the 5G New Radio signal, and the link switching is without delay and without signal crosstalk. The coverage unit RF module has a preset time-division duplex time-slot allocation rule, which is consistent with the time-slot allocation of the 5G New Radio signal. When the downlink switching control level is received, the RF circuit immediately activates the downlink and closes the uplink, entering the downlink signal transmission operating state; when the uplink switching control level is received, the RF circuit immediately activates the uplink and closes the downlink, entering the uplink signal reception and backhaul operating state. During the link switching process, the working stability of the RF circuit is guaranteed, and there is no component damage or signal loss.

[0026] The central control unit is electrically connected to the optical emission module of the access unit and the optical receiving module of the coverage unit, respectively. It is used to collect the optical emission power, laser operating current, and ambient temperature parameters of the optical emission module of the access unit and the optical receiving power parameters of the optical receiving module of the coverage unit, calculate the adjustment amount of each parameter, issue optical emission power adjustment and temperature compensation commands to the optical emission module of the access unit, and issue optical emission link gain adjustment commands to the optical receiving module of the coverage unit.

[0027] Optionally, the central control unit completes parameter acquisition and adjustment command issuance in parallel throughout all the above signal processing steps. The specific process includes: 1. Parameter Acquisition: The central control unit is electrically connected to the optical transmitter module of the access unit and the optical receiver module of the coverage unit, respectively. It acquires the optical transmission power parameters, laser operating current parameters, and ambient temperature parameters of the optical transmitter module of the access unit, as well as the optical receiver power parameters of the optical receiver module of the coverage unit, according to a preset cycle. The optical transmission power parameter is acquired once every second, and the average value is taken after 5 consecutive acquisitions as the valid calculation value. The laser operating current parameters and ambient temperature parameters are acquired once every 30 minutes, and the average value is taken after 5 consecutive acquisitions as the valid calculation value. The optical receiver power parameter is acquired and calculated in real time. 2. Adjustment Calculation: The central control unit... The unit compares each collected effective parameter with the corresponding preset threshold, and calculates the optical emission power adjustment, laser operating current temperature compensation, and optical link gain adjustment according to the preset algorithm. The optical emission power adjustment is calculated based on the difference between the actual optical emission power and the preset threshold, and the temperature compensation is calculated based on the difference between the ambient temperature and the reference temperature, combined with the preset temperature-current compensation step. At the same time, the optical link gain adjustment is also calculated. 3. Command issuance: The central control unit issues emission power adjustment commands and temperature compensation commands to the optical emission modules of the access unit, and emission link gain adjustment commands to the optical receiving modules of the coverage unit, based on the calculated adjustment values. After receiving the commands, each module promptly executes the corresponding parameter adjustments to ensure the stability of the signal power and device operating status throughout the system.

[0028] Optional, refer to Figure 5 The calculation process for the optical link gain adjustment is as follows: First, the monitoring component of the optical receiving module of the coverage unit collects the optical receiving power parameters corresponding to the target multi-band radio frequency signal in real time. The optical receiving power parameter refers to the power value that can be recognized by the central control unit after the optical signal received by the optical receiving module of the coverage unit is converted into an electrical signal by the hardware circuit. This parameter is transmitted to the central control unit in real time. The central control unit compares the collected actual optical receiving power parameter with the preset optical receiving power target value, calculates the absolute difference between the two, and multiplies the difference by 2 dB to obtain the gain compensation adjustment value. The digital attenuator in the optical receiving module of the coverage unit has a preset initial attenuation value of 20 dB. The digital attenuator refers to an electronic device that can adjust the attenuation amount through electrical signal commands to realize radio frequency signal gain control. According to the calculated gain compensation adjustment value, the central control unit sends a gain adjustment command to the digital attenuator. The digital attenuator adjusts the attenuation amount in 0.5 dB steps, releasing the corresponding attenuation value to realize the gain compensation of the radio frequency signal. Finally, the gain-compensated gain radio frequency signal is obtained, ensuring that the power of the gain radio frequency signal is stable within the preset threshold range.

[0029] This invention, through the processing and modulation of multi-band radio frequency signals on the air interface by the access unit's radio frequency module, obtains target multi-band radio frequency signals and amplitude shift keying (APS) signals. Based on this result, precise processing of multi-band radio frequency signals and synchronous generation of control signals are achieved, enabling the multi-band service signals and time slot switching control signals to form a compatible signal combination. Based on this signal combination, the access unit's optical transmission module can combine and convert the two signals to obtain an initial multi-band optical signal. After adjustment and temperature compensation, a stable target multi-band optical signal is obtained. Based on this stable target multi-band optical signal, integrated transmission of multi-band radio frequency signals and control signals is achieved, while avoiding transmission instability due to environmental factors. This integrated transmission signal form allows the coverage unit's optical receiving module to simultaneously complete photoelectric conversion to obtain the corresponding target multi-band radio frequency signals and APS signals. Furthermore, based on... Gain compensation of the target multi-band RF signal and analysis and restoration of the amplitude shift keying signal yield the gain RF signal and uplink / downlink switching control level, respectively. The gain RF signal ensures the signal strength of the multi-band RF signal after transmission. The uplink / downlink switching control level enables the coverage unit RF module to achieve precise time slot switching between the uplink and downlink of the RF circuit. Based on this precise time slot switching, time slot management of uplink and downlink transmission of multi-band RF signals is realized. Finally, the entire process from signal processing, transmission to transmission and backhaul achieves precise management and dynamic adaptation of multi-band signals. This solves the technical problems of severe interference between multi-band signals, lack of flexibility in signal allocation and management, and inability to dynamically adjust according to actual needs. It improves the stability of multi-band signal transmission, allows communication resources to be used efficiently according to service needs, and effectively improves the technical effect of poor communication coverage.

[0030] Furthermore, the control method of the multi-frequency multi-path analog optical distribution system provided by the present invention will be described below. The control method of the multi-frequency multi-path analog optical distribution system described below can be referred to in correspondence with the control method of the multi-frequency multi-path analog optical distribution system described above.

[0031] Optional, refer to Figure 2 and Figures 6-7 , Figure 2 This is a flowchart illustrating the structure of the control method for a multi-frequency, multi-path analog optical distribution system provided by the present invention. The control method for the multi-frequency, multi-path analog optical distribution system includes: Step 10: Process and modulate the acquired air interface multi-band radio frequency signal to obtain the target multi-band radio frequency signal and amplitude shift keying signal.

[0032] Optionally, after the analog optical distribution system acquires the air interface multi-band radio frequency signal through the access unit radio frequency module, it obtains the target multi-band radio frequency signal that can be converted into photoelectric signal through a series of operations such as frequency band processing, interference filtering, signal amplification, synchronous analysis and modulation. At the same time, it generates an amplitude shift keying signal containing 5G new air interface signal uplink and downlink switching information to complete the signal preprocessing and modulation preparation, as described in steps 101 to 105.

[0033] Step 20: Combine the target multi-band radio frequency signal and amplitude shift keying signal to obtain the initial multi-band optical signal, and adjust and temperature-compensate the multi-band optical signal to obtain the target multi-band optical signal.

[0034] Optionally, the simulated optical distribution system receives the target multi-band radio frequency signal and amplitude shift keying signal output by the radio frequency module of the access unit through the optical transmission module of the access unit. The two signals are fused into a single electrical signal through a signal combiner, and then converted into an initial multi-band optical signal through a photoelectric conversion circuit. Subsequently, the optical transmission power of the initial multi-band optical signal is automatically adjusted, and temperature compensation of the laser operating current is performed according to changes in ambient temperature. Finally, a target multi-band optical signal with stable power and meeting transmission requirements is obtained, completing the preparation for optical signal transmission, as described in steps 201 to 203.

[0035] Step 30: Perform photoelectric conversion based on the target multi-band optical signal to obtain the target multi-band radio frequency signal and amplitude shift keying signal. Perform gain compensation on the target multi-band radio frequency signal and analyze and restore the amplitude shift keying signal to obtain the gain radio frequency signal and uplink / downlink switching control level, respectively.

[0036] Optionally, the simulated optical distribution system receives the target multi-band optical signal transmitted via the optical transmission link through the optical receiving module of the coverage unit, and converts the optical signal back into an electrical signal through the photoelectric conversion circuit, and separates the target multi-band radio frequency signal and amplitude shift keying signal, as in steps 301 to 302.

[0037] Optionally, the simulated optical distribution system performs optical link automatic gain control compensation on the target multi-band RF signal obtained after photoelectric conversion through the optical receiver module of the coverage unit, and analyzes and restores the amplitude shift keying signal obtained after photoelectric conversion, and finally obtains the gain RF signal and uplink / downlink switching control level, as in steps 303 to 304.

[0038] Reference Figure 7 , Figure 7 This is a flowchart of the time slot switching control.

[0039] Step 40: Based on the uplink and downlink switching control level, the uplink and downlink of the radio frequency circuit are time-slot switched. When the downlink is activated, the gain-based radio frequency signal is pre-processed and then transmitted to the coverage area by the coverage antenna. When the uplink is activated, the uplink radio frequency signal transmitted by the terminal in the coverage area is pre-processed and then transmitted back.

[0040] Optionally, the simulated optical distribution system receives the uplink / downlink switching control level output by the coverage unit's optical receiving module through the coverage unit's RF module. Based on this control level, it completes the time-division duplex time-slot switching of the RF circuit's uplink and downlink. Time-division duplex time-slot switching refers to switching the RF circuit to the corresponding uplink or downlink operating state in different time domains according to the time-slot allocation rules of the 5G New Radio signal, with no link switching delay and no signal crosstalk. The coverage unit's RF module has a preset time-division duplex time-slot allocation rule, which is consistent with the time-slot allocation of the 5G New Radio signal. When the downlink switching control level is received, the RF circuit immediately activates the downlink and closes the uplink, entering the downlink signal transmission operating state. When the uplink switching control level is received, the RF circuit immediately activates the uplink and closes the downlink, entering the uplink signal reception and backhaul operating state. During the link switching process, the stability of the RF circuit is ensured, with no component damage or signal loss.

[0041] In one embodiment, the radio frequency module of the industrial park coverage unit presets the time-division duplex time slot ratio of the 5G new radio interface signal to be 7:1:2, that is, 7 downlink time slots, 1 guard time slot, and 2 uplink time slots, with 5 milliseconds as a single cycle. When receiving the downlink switching control level output by the optical receiver module of the coverage unit, the radio frequency circuit activates the downlink and closes the uplink, continuously transmitting downlink signals within the 7 downlink time slots. When receiving the uplink switching control level, the radio frequency circuit completes the link switching in the guard time slot, activates the uplink and closes the downlink, continuously receiving the uplink signals from the terminal within the 2 uplink time slots, thus completing the time-division duplex time slot switching.

[0042] Furthermore, in the downlink active state, the coverage unit RF module of the simulated optical distribution system preprocesses the gain RF signal output by the coverage unit optical receiver module before transmitting it to the coverage area via the coverage antenna. The preprocessing includes two steps: frequency band selective filtering and high-linearity power amplification. Frequency band selective filtering refers to the coverage unit RF module configuring an independent filtering circuit for each communication frequency band. The filtering circuit performs frequency band processing on the gain RF signal, filtering out interference signals outside each frequency band and retaining only the effective RF signal of the corresponding frequency band. Interference signals refer to spurious signals and adjacent-channel signals that affect communication, which are not part of the target communication frequency band. High-quality signal; high-linearity power amplification refers to the fact that the coverage unit RF module is equipped with an independent high-linearity power amplification tube for each communication frequency band. The high-linearity power amplification tube amplifies the effective RF signals of each frequency band after frequency selection and filtering, ensuring that the amplified signal has high linearity and no signal distortion. Linearity refers to the characteristic that the waveform, frequency, and phase of the amplified signal remain consistent with the original signal. After the RF signals of each frequency band are combined after preprocessing, they are transmitted to the coverage antenna. The coverage antenna converts the electrical signal into an air interface RF signal and transmits it evenly to the preset coverage area, ensuring that the signal strength and communication quality within the coverage area meet the requirements.

[0043] Continuing with the above embodiment, the downlink of the radio frequency module of a coverage unit in the industrial park is activated. The received gain radio frequency signal includes four frequency bands: LTE1800, N12100, 5GN41, and 5GN78. The module performs frequency-selective filtering on the gain radio frequency signal through four independent filtering circuits to filter out spurious interference signals outside each frequency band. Then, it amplifies the power of each frequency band signal after filtering through four independent high-linearity power amplifier tubes to ensure that the signal is not distorted. The combined four-band radio frequency signal is transmitted to the coverage antenna, which transmits it to the office and production areas of the building, realizing full-band signal coverage in the area, with the signal strength stable between -85 dBmW and -70 dBmW.

[0044] Furthermore, in the uplink active state, the coverage unit RF module of the analog optical distribution system receives the uplink RF signal transmitted by the terminal within the coverage area through the coverage antenna. After preprocessing the uplink RF signal, it completes the signal return. The preprocessing is consistent with the downlink preprocessing, also including two steps: frequency band selective filtering and high linear power amplification. Frequency band selective filtering refers to processing the received uplink RF signal by dividing it into frequency bands through independent filtering circuits for each frequency band, filtering out interference signals outside the frequency band, and retaining the valid uplink RF signal; high linear power amplification... Linear power amplification refers to the use of independent high-linearity power amplifiers for each frequency band to amplify the effective uplink RF signal with low noise and high linearity, ensuring the signal-to-noise ratio (SNR) during subsequent backhaul. The SNR is the ratio of the effective signal power to the interference signal power; the higher the ratio, the better the communication quality. After preprocessing, the uplink RF signal is sequentially transmitted back through the coverage unit optical receiver module, optical transmission link, access unit optical transmitter module, and access unit RF module. Finally, the access unit RF module transmits the uplink RF signal to the base station, completing the entire uplink signal transmission process.

[0045] Continuing with the above embodiment, the uplink of the radio frequency module of a coverage unit in the industrial park is activated. The coverage antenna receives uplink radio frequency signals in the LTE1800 and 5GN41 bands transmitted by mobile phones and industrial IoT terminals in the area. The module filters out interference signals through independent filtering circuits for the corresponding frequency bands, and then amplifies the power through a high-linearity power amplifier tube to ensure that the signal-to-noise ratio is not less than 25 dB. The amplified uplink radio frequency signal is converted into an optical signal by the optical receiving module of the coverage unit, and transmitted back to the optical transmitting module of the access unit through the optical fiber transmission link. Then, the access unit radio frequency module converts it into an electrical signal and transmits it to the base station, completing the reception and transmission of the uplink signal. The base station can clearly identify the uplink signal transmitted by the terminal.

[0046] This invention, through the processing and modulation of multi-band radio frequency signals on the air interface by the access unit's radio frequency module, obtains target multi-band radio frequency signals and amplitude shift keying (APS) signals. Based on this result, precise processing of multi-band radio frequency signals and synchronous generation of control signals are achieved, enabling the multi-band service signals and time slot switching control signals to form a compatible signal combination. Based on this signal combination, the access unit's optical transmission module can combine and convert the two signals to obtain an initial multi-band optical signal. After adjustment and temperature compensation, a stable target multi-band optical signal is obtained. Based on this stable target multi-band optical signal, integrated transmission of multi-band radio frequency signals and control signals is achieved, while avoiding transmission instability due to environmental factors. This integrated transmission signal form allows the coverage unit's optical receiving module to simultaneously complete photoelectric conversion to obtain the corresponding target multi-band radio frequency signals and APS signals. Furthermore, based on... Gain compensation of the target multi-band RF signal and analysis and restoration of the amplitude shift keying signal yield the gain RF signal and uplink / downlink switching control level, respectively. The gain RF signal ensures the signal strength of the multi-band RF signal after transmission. The uplink / downlink switching control level enables the coverage unit RF module to achieve precise time slot switching between the uplink and downlink of the RF circuit. Based on this precise time slot switching, time slot management of uplink and downlink transmission of multi-band RF signals is realized. Finally, the entire process from signal processing, transmission to transmission and backhaul achieves precise management and dynamic adaptation of multi-band signals. This solves the technical problems of severe interference between multi-band signals, lack of flexibility in signal allocation and management, and inability to dynamically adjust according to actual needs. It improves the stability of multi-band signal transmission, allows communication resources to be used efficiently according to service needs, and effectively improves the technical effect of poor communication coverage.

[0047] Optionally, the process of steps 101 to 105 includes: Step 101: Perform frequency segmentation and selective filtering on the air interface multi-band radio frequency signal to obtain the effective signal after filtering out interference.

[0048] Optionally, after the access unit RF module of the analog optical distribution system acquires the air interface multi-band RF signal, it initiates a frequency band selection and filtering operation. The access unit RF module configures an independent frequency selection and filtering circuit for each target communication frequency band. The frequency selection and filtering circuit refers to a passive filter circuit composed of capacitors, inductors, and resistors or a circuit integrating an active filter chip, which can accurately filter signals within a specified frequency range and block signals at non-specified frequencies. The air interface multi-band RF signal is simultaneously input to the frequency selection and filtering circuit corresponding to each frequency band. Each frequency selection and filtering circuit performs frequency filtering on the input mixed signal according to the preset target communication frequency band frequency range, allowing only the target frequency band RF signal within the preset frequency range to pass through, and blocking and filtering out all spurious signals, adjacent channel signals, and noise signals outside the preset frequency range. External interference signals refer to all RF signals that are not in the target communication frequency band and affect the quality of the communication signal. After each frequency selection and filtering circuit completes filtering, it summarizes the corresponding target frequency band RF signals to obtain the overall effective signal after filtering out interference. This signal only contains the effective RF signals of each target communication frequency band and is free from external interference signals.

[0049] In one embodiment, the access unit radio frequency module acquires radio frequency signals from multiple air interface bands, including 1800 MHz of LTE, 2100 MHz of NR, 41 band of 5G NR, and 78 band of 5G NR. The module configures independent frequency selection and filtering circuits for the above four bands. Each circuit selects frequencies within the ranges of 1710-1785 MHz / 1805-1880 MHz, 1920-1980 MHz / 2110-2170 MHz, 2515-2675 MHz, and 3400-3600 MHz, respectively, to filter out interference signals from non-target frequency bands such as 450 MHz and 900 MHz. Finally, the signals are aggregated to obtain effective signals containing only the above four target frequency bands after interference filtering.

[0050] Step 102: Amplify the signal based on the effective signal after filtering out interference to obtain the amplified multi-band amplified radio frequency signal.

[0051] Optionally, the access unit RF module of the analog optical distribution system inputs the interference-filtered effective signal to the signal amplification circuit. The signal amplification circuit includes a low-noise amplifier and a high-linearity broadband amplifier tube. The low-noise amplifier is an amplification device that generates extremely low noise while amplifying the signal, ensuring the signal-to-noise ratio of the amplified signal. The high-linearity broadband amplifier tube is an amplification device that can amplify RF signals over a wide frequency range and maintain high linearity and distortion-free characteristics after amplification. The interference-filtered effective signal is first amplified by the low-noise amplifier to increase the signal's fundamental power while suppressing noise introduction during amplification. The amplified signal is then input to the high-linearity broadband amplifier tube for secondary power amplification. During amplification, the linearity of the signal is strictly guaranteed. Linearity refers to the characteristic that the waveform, frequency, and phase of the amplified signal remain consistent with the original signal, avoiding signal distortion. The RF signals of each target frequency band are amplified by their respective independent signal amplification circuits and then combined to obtain amplified multi-band RF signals, ensuring that the signal power meets the requirements of subsequent photoelectric conversion and transmission, while maintaining high signal-to-noise ratio and high linearity.

[0052] Continuing with the above embodiment, the access unit RF module inputs the effective signal after interference filtering to the independent signal amplification circuits of four frequency bands, namely 1800 MHz of LTE and 2100 MHz of NR. Each circuit first amplifies the signal power from -100 dBmW to -70 dBmW through a low-noise amplifier, and then amplifies it to -30 dBmW through a high-linearity broadband amplifier tube. During the amplification process, it ensures that there is no waveform or frequency distortion in each frequency band signal and that the signal-to-noise ratio is maintained above 30 dB. Finally, the signals of the four frequency bands are summed to obtain the multi-band amplified RF signals.

[0053] Step 103: Perform level stabilization control based on the multi-band amplified radio frequency signal to obtain the target multi-band radio frequency signal.

[0054] Optionally, the access unit RF module of the analog optical distribution system inputs the obtained multi-band amplified RF signal to the automatic level control circuit. The automatic level control circuit is a control circuit that can monitor the signal level value in real time and automatically adjust the signal amplification gain according to a preset level threshold to maintain a stable output signal level. The automatic level control circuit has a preset target level threshold range, which refers to the allowable fluctuation range of the signal level set to ensure the subsequent photoelectric conversion effect. The circuit uses a power detection component to collect the actual level value of each frequency band signal in the multi-band amplified RF signal in real time. The actual level value refers to the power of the RF signal. The signal level value directly reflects the signal power. When the actual signal level of a certain frequency band is detected to be higher than the upper limit of the preset target signal level threshold, the automatic level control circuit automatically reduces the gain of the signal amplifier circuit for that frequency band, causing the signal level to fall back to the threshold range. When the actual signal level of a certain frequency band is detected to be lower than the lower limit of the preset target signal level threshold, the automatic level control circuit automatically increases the gain of the signal amplifier circuit for that frequency band, causing the signal level to rise to the threshold range. After the signal levels of each frequency band have been stabilized, the automatic level control circuit outputs a uniform signal with a signal level maintained within the preset threshold range, thus obtaining the target multi-band radio frequency signal.

[0055] Continuing with the above embodiment, the automatic level control circuit of the access unit's RF module presets a target level threshold range of -32 dBmW to -28 dBmW. The circuit detects the actual level value of each frequency band in the multi-band amplified RF signal in real time. When it detects that the 5G NR 41 band signal level is -26 dBmW, which is higher than the upper threshold limit, the circuit automatically reduces the amplification gain of this band, causing the level to drop back to -30 dBmW. When it detects that the LTE 1800 MHz band signal level is -34 dBmW, which is lower than the lower threshold limit, the circuit automatically increases the amplification gain of this band, raising the level to -30 dBmW. The signal levels of the remaining frequency bands are all within the threshold range and do not require adjustment. Finally, the target multi-band RF signal with the average level of each frequency band stabilized at around -30 dBmW is obtained.

[0056] Step 104: Based on the 5G New Radio signal, perform synchronization block parsing and signal generation to obtain the time slot uplink / downlink switching control signal.

[0057] Optionally, the access unit radio frequency module of the simulated optical distribution system extracts the fifth-generation (5G) new radio interface signal from the target multi-band radio frequency signal and inputs the signal to the synchronization parsing module. The synchronization parsing module is a dedicated processing module with the function of identifying and parsing 5G new radio interface signal synchronization blocks, which can extract synchronization information from the 5G new radio interface signal. The synchronization parsing module performs synchronization block detection and parsing on the 5G new radio interface signal according to the protocol standard of fifth-generation mobile communication technology. The synchronization block refers to the signal block in the 5G new radio interface signal used to achieve time synchronization and frequency synchronization, including core synchronization information such as time slot allocation and uplink / downlink switching timing. After parsing, the synchronization parsing module extracts key content such as the time slot allocation rules and uplink / downlink switching timing information of the 5G new radio interface signal, and generates a time slot uplink / downlink switching control signal in the form of an electrical signal that matches the key content. The control signal contains uplink and downlink time slot switching instructions of the 5G new radio interface signal in different time domains, which can be directly used for subsequent signal modulation and link switching control.

[0058] Continuing with the above embodiment, the access unit radio frequency module extracts the 5G New Radio 41 band signal from the target multi-band radio frequency signal and inputs it to the synchronization parsing module. The module parses the synchronization block information of the signal according to the fifth-generation mobile communication technology protocol standard, and obtains the time slot allocation rule as 5 milliseconds single cycle, 7:1:2, that is, 7 downlink time slots, 1 guard time slot, 2 uplink time slots, and the corresponding uplink and downlink switching timing. The module generates a time slot uplink and downlink switching control signal in the form of an electrical signal based on this information. This signal can issue instructions for downlink time slot initiation, uplink time slot initiation, and guard time slot switching within a preset time domain.

[0059] Step 105: Perform amplitude shift keying based on the time slot uplink / downlink switching control signal to obtain the amplitude shift keying signal carrying 5G uplink / downlink switching information.

[0060] Optionally, the access unit RF module of the analog optical distribution system inputs the time slot uplink / downlink switching control signal to the amplitude shift keying (APS) modulation circuit. The APS modulation circuit is a circuit that modulates the signal by changing the amplitude of the carrier signal and loading the digital control signal onto the carrier signal. The APS modulation circuit has a built-in fixed-frequency RF carrier signal, which is a high-frequency RF signal used to carry control signal information and realize long-distance transmission. The circuit adjusts the amplitude of the carrier signal according to the digital logic state of the time slot uplink / downlink switching control signal. When the control signal is at a high level, the modulation circuit outputs a high-amplitude carrier signal; when the control signal is at a low level, the modulation circuit outputs a low-amplitude carrier signal. The change in the amplitude of the carrier signal represents the logic information of the time slot uplink / downlink switching control signal. After modulation, the APS modulation circuit outputs the modulated RF signal, which is the APS signal carrying the fifth-generation uplink / downlink switching information. This signal can be combined with the target multi-band RF signal for photoelectric conversion to realize the long-distance transmission of the fifth-generation uplink / downlink switching control information.

[0061] Continuing with the above embodiment, the amplitude shift keying modulation circuit of the access unit's radio frequency module has a built-in 1920 MHz fixed carrier signal. After receiving the uplink / downlink switching control signal of the time slot, the circuit performs amplitude modulation on the carrier signal: when the control signal is a high-level logic for starting the downlink time slot, it outputs a carrier signal with an amplitude of 1 volt; when the control signal is a low-level logic for starting the uplink time slot, it outputs a carrier signal with an amplitude of 0.2 volts; when the control signal is a transition logic for the protection time slot, it outputs a carrier signal with an amplitude of 0.5 volts, ultimately obtaining an amplitude shift keying signal carrying uplink / downlink switching information of the 5G New Radio 41 band.

[0062] This invention achieves high-purity, high-stability, and high-synchronization processing of multi-band radio frequency signals over the air interface. It also enables the modulation and fusion of fifth-generation time-division duplex control signals. The output target multi-band radio frequency signals and amplitude shift keying signals can be directly used for subsequent photoelectric conversion and long-distance transmission. This solves problems such as signal interference, unstable levels, and complex control signal transmission in existing multi-frequency multi-path optical distribution systems, and improves the signal processing accuracy and transmission stability of the system.

[0063] Optionally, refer to Figure 6 , Figure 6 The control flowchart for the optical transmission module of the access unit includes steps 201 to 203, which include: Step 201: Combine the target multi-band radio frequency signal and the amplitude shift keying signal to obtain a first hybrid electrical signal.

[0064] Optionally, the access unit optical transmission module of the analog optical distribution system receives the target multi-band RF signal and amplitude shift keying signal output by the access unit RF module, and inputs the two signals to a signal combining circuit. This signal combining circuit has a multi-channel electrical signal fusion function, which can integrate electrical signals of different types and frequency bands into a single composite electrical signal. Furthermore, it is an RF circuit with no signal loss and no frequency band crosstalk during the fusion process. The signal combining circuit performs co-frequency domain fusion processing on the target multi-band RF signal and the amplitude shift keying signal according to a preset signal fusion rule, that is, within the same electrical signal transmission channel, it performs... The power and phase of the two signals are adapted and integrated to ensure that the effective information of both signals is completely preserved and that there is no mutual cancellation or interference. During the fusion process, the combining circuit matches the transmission impedance of the two signals. Transmission impedance matching refers to adjusting the circuit impedance to a preset standard value to avoid signal reflection and loss problems caused by impedance mismatch, and to ensure the signal transmission efficiency after combining. After the combining and impedance matching are completed, the signal combining circuit outputs a composite electrical signal containing all the effective information of the target multi-band radio frequency signal and all the control information of the amplitude shift keying signal, namely the first hybrid electrical signal.

[0065] In one embodiment, the access unit optical transmission module receives target multi-band radio frequency signals including 1800 MHz LTE, 2100 MHz NR, 41 band 5G NR, and 78 band 5G NR, as well as amplitude shift keying signals carrying 5G uplink / downlink switching information. The two signals are input to the radio frequency combining circuit, which performs impedance matching of the two signals to 50 ohms, and then performs co-frequency domain fusion. Finally, the first hybrid electrical signal containing the above four-band service signals and the 5G control signal is output. During the fusion process, the power loss of each signal is less than 0.5 dBmW.

[0066] Step 202: Amplify the first hybrid electrical signal using a high-linearity broadband amplifier tube to obtain a first hybrid amplified signal, and then convert the first hybrid amplified signal into an electrical signal using an optical emitting laser to obtain an initial multi-band optical signal.

[0067] Optionally, the access unit optical generation module of the simulated optical distribution system inputs the first hybrid electrical signal to the signal amplification branch. This branch is also equipped with a dedicated high-linearity broadband amplifier tube. The first hybrid electrical signal is amplified by the high-linearity broadband amplifier tube. During the amplification process, the preset amplification gain is strictly followed to ensure that the power of the amplified signal meets the photoelectric conversion input requirements of the optical emitting laser. At the same time, all effective information and control information in the signal are retained without loss or distortion. After amplification, the output power of the composite electrical signal meets the standard, which is the first hybrid amplified signal. The access unit optical generation module inputs the first hybrid amplified signal to the electrical signal conversion port of the optical emitting laser. The optical emitting laser refers to an optoelectronic device with electro-optical signal conversion function, which can convert radio frequency electrical signals into optical signals of corresponding frequencies, realizing the physical conversion of electrical signals to optical signals. The optical emitting laser converts the electrical signal energy of the first hybrid amplified signal into optical signal energy according to the preset electro-optical conversion ratio. During the conversion process, the modulation information and frequency information of the signal are completely preserved. Finally, the optical signal corresponding one-to-one with the information of the first hybrid amplified signal is output, which is the initial multi-band optical signal. This signal is a composite signal in optical form.

[0068] Continuing with the above embodiment, the access unit's optical transmission module inputs the first hybrid electrical signal to a high-linearity broadband amplifier tube, amplifies the power by 30 dB, and increases the signal power from -30 dBmW to 0 dBmW to obtain the first hybrid amplified signal. The amplified signal has no distortion. The first hybrid amplified signal is then input to a 1310 nm wavelength optical emission laser. The laser converts the electrical signal into an optical signal at a 1:1 electro-optical conversion ratio, and finally outputs an initial multi-band optical signal containing four-band service signals and fifth-generation control signals. The initial power of the optical signal is 2 dBmW.

[0069] Step 203: The optical power signal from the optical emitting laser and the temperature signal from the temperature sensor are transmitted to the central processing unit. Based on the preset optical emission power digital-to-analog conversion reference threshold and the digital-to-analog conversion compensation value corresponding to the preset temperature range in the central processing unit, the digital-to-analog conversion value of the laser driving circuit is adjusted to adjust and compensate the temperature of the multi-band optical signal, thereby obtaining the target multi-band optical signal.

[0070] Optionally, the access unit optical emission module of the simulated optical distribution system acquires the optical power signal of the initial multi-band optical signal output by the optical emitting laser through an optical power monitoring component. The optical power monitoring component refers to a detection device that can detect the magnitude of the optical signal power in real time and convert the physical quantity of optical power into a transmittable electrical signal. At the same time, it acquires the ambient temperature signal of the access unit optical emission module through a temperature sensor. The optical power signal and temperature signal are transmitted to the central control unit in real time through an electrical transmission channel. The central control unit pre-stores the optical emission power digital-to-analog conversion reference threshold. The optical emission power digital-to-analog conversion reference threshold refers to the preset threshold range of digital-to-analog conversion values ​​corresponding to the output optical power of the optical emitting laser to ensure the stability of optical signal transmission. At the same time, it pre-stores the digital-to-analog conversion compensation value corresponding to the temperature range. The digital-to-analog conversion compensation value corresponding to the temperature range refers to the pre-calibrated digital-to-analog conversion compensation data, which is stepped in 10 degrees Celsius from -20 degrees Celsius to 50 degrees Celsius, used to compensate for the influence of temperature changes on the laser's operating current.

[0071] Optionally, the central control unit of the simulated optical distribution system processes the received optical power signal, acquiring the digital-to-analog conversion value corresponding to the optical power once per second. After five consecutive acquisitions, the average value is taken as the effective calculated value of the optical power. This effective calculated value is compared with a preset optical emission power digital-to-analog conversion reference threshold. If the effective calculated value is lower than the lower limit of the reference threshold, an instruction to increase the digital-to-analog conversion value is sent to the laser driver circuit. If the effective calculated value is higher than the upper limit of the reference threshold, an instruction to decrease the digital-to-analog conversion value is sent to the laser driver circuit. If it is within the threshold range, no optical power adjustment is performed, ensuring the optical emission power during the adjustment process. The deviation of the conversion rate is controlled within ±20°C of the analog-to-digital conversion value. At the same time, the central control unit processes the received temperature signal, collects the analog-to-digital conversion value corresponding to the ambient temperature every 30 minutes, and takes the average value after 5 consecutive collections as the effective temperature calculation value. Based on the effective calculation value, it matches the analog-to-digital conversion compensation value corresponding to the pre-stored temperature range. If the ambient temperature is higher than the reference temperature, it sends an instruction to the laser driver circuit to increase the corresponding analog-to-digital conversion compensation value. If the ambient temperature is lower than the reference temperature, it sends an instruction to the laser driver circuit to decrease the corresponding analog-to-digital conversion compensation value, thereby realizing temperature compensation for the laser operating current.

[0072] Specifically, the laser driver circuit refers to the driver circuit that provides a stable operating current to the optical emitting laser and can adjust the output current according to the instructions of the central control unit. This circuit receives the optical power adjustment digital-to-analog conversion value instruction and the temperature compensation digital-to-analog conversion value instruction issued by the central control unit, superimposes the two adjustment values ​​to obtain the final digital-to-analog conversion adjustment value, and then adjusts the operating current output to the optical emitting laser in real time according to the adjustment value. By changing the laser's operating current, the output optical signal power is precisely adjusted and temperature drift compensation is achieved. Based on the adjusted operating current, the optical emitting laser outputs a stable optical signal that is unaffected by ambient temperature, namely the target multi-band optical signal. The power of this optical signal is always kept within a preset threshold range to meet the long-distance transmission requirements of the optical transmission link, and then transmitted to the coverage unit through the optical transmission link.

[0073] In one embodiment, the optical power monitoring component of the access unit's optical transmission module collects the optical power signal of the initial multi-band optical signal, and the temperature sensor collects the ambient temperature of the device at 45 degrees Celsius. Both signals are transmitted to the central control unit. The central control unit presets an optical power digital-to-analog conversion reference threshold corresponding to an optical power of 3 dBmW ± 0.5 dBmW. The preset temperature range corresponds to a digital-to-analog conversion compensation value of 20 for every 10 degrees Celsius increase in temperature, with a reference temperature of 25 degrees Celsius. The central control unit collects the optical power digital-to-analog conversion value once per second, and the values ​​collected for five times are 1800, 1810, 1805, 1810, 180... 5. The average value is 1806, which is lower than the lower limit of the reference threshold of 1850. A power adjustment command to increase the digital-to-analog conversion value by 44 is issued. At the same time, the temperature digital-to-analog conversion value is collected once every 30 minutes. The average value of 5 times corresponds to 45 degrees Celsius, which is 20 degrees Celsius higher than the reference temperature. A digital-to-analog conversion compensation value of 40 is obtained, and a temperature compensation command is issued. The laser driver circuit superimposes 44 and 40 to obtain a final digital-to-analog conversion adjustment value of 84. The laser operating current is adjusted to increase the optical emission power from 2 dBmW to 3.2 dBmW, completing the temperature compensation and optical power adjustment. The final output power is the target multi-band optical signal with a power of 3.2 dBmW.

[0074] This invention achieves high-quality conversion and stable output of electrical signals to optical signals through interlocking signal processing and precise closed-loop control. The output target multi-band optical signals have information integrity, power stability, and transmission adaptability, effectively solving problems such as optical power fluctuation, large temperature influence, and complex signal transmission links in existing optical transmission modules. It improves the long-distance transmission quality of optical signals, while simplifying the system architecture and reducing costs.

[0075] Optionally, the processes of steps 301 to 304 include: Step 301: Based on the photodetector, the multi-band optical signal is converted into a second hybrid electrical signal containing the target multi-band radio frequency signal and the amplitude shift keying signal.

[0076] Optionally, the coverage unit optical receiving module of the simulated optical distribution system receives the target multi-band optical signal transmitted via the optical transmission link and inputs the optical signal to a photodetector. The photodetector is an optoelectronic device that has an optical-to-electrical signal conversion function, which can convert the optical energy of the optical signal into the corresponding electrical energy and completely retain all the information in the optical signal. The photodetector converts the optical signal of the target multi-band optical signal into an electrical signal according to a preset photoelectric conversion ratio. During the conversion process, it strictly ensures that the effective information of the target multi-band radio frequency signal and the amplitude shift keying signal control information in the optical signal are not lost or distorted. The photoelectric conversion ratio refers to a fixed ratio between the power of the optical signal and the power of the converted electrical signal, which is adapted to the signal transmission characteristics of the optical transmission link. After the photoelectric conversion is completed, the photodetector outputs a composite electrical signal containing all the information of the target multi-band radio frequency signal and the amplitude shift keying signal, namely the second hybrid electrical signal. This signal is a composite signal in electrical form.

[0077] In one embodiment, the coverage unit optical receiver module receives a target multi-band optical signal transmitted from the optical transmission link, which includes four-band service signals such as 1800 MHz of LTE and fifth-generation uplink / downlink switching control information. The signal is then input to a silicon-based photodetector, which converts the optical signal into an electrical signal at a photoelectric conversion ratio of 1:0.8. No information is lost during the conversion process. The final output is a second hybrid electrical signal containing the aforementioned four-band radio frequency signals and amplitude shift keying signals. The initial power of the electrical signal is -40 dBmW.

[0078] Step 302: Amplify the second mixed electrical signal to obtain a second mixed amplified signal, and separate the second mixed amplified signal to obtain the target multi-band radio frequency signal and the amplitude shift keying signal.

[0079] Optionally, the optical receiving module of the coverage unit of the simulated optical distribution system inputs the second hybrid electrical signal to a dedicated signal amplification circuit, which is equipped with a high-linearity broadband amplifier tube. The signal amplification circuit amplifies the second hybrid electrical signal according to a preset amplification gain, retaining all effective information and control information in the signal during the amplification process, so that the power of the amplified signal meets the technical requirements of subsequent signal separation and processing. After amplification, the output power of the composite electrical signal meets the standard, which is the second hybrid amplified signal. The optical receiving module of the coverage unit inputs the second hybrid amplified signal to a signal separation circuit. The signal separation circuit refers to a radio frequency circuit with composite electrical signal splitting function, which can accurately separate different types of signals in the composite electrical signal according to the frequency and amplitude characteristics of the signal, and the separation process is free of signal loss and crosstalk. The signal separation circuit performs accurate separation processing on the second hybrid amplified signal according to the frequency characteristic difference between the target multi-band radio frequency signal and the amplitude shift keying signal, respectively extracting the target multi-band radio frequency signal containing effective information of each target communication frequency band, and the amplitude shift keying signal carrying the fifth-generation uplink and downlink switching control information, so that the power of the two separated signals meets the requirements of their respective subsequent processing stages.

[0080] Continuing with the above embodiment, the optical receiver module of the coverage unit inputs a second hybrid electrical signal with a power of -40 dBmW to the signal amplification circuit, which performs high linear power amplification at a gain of 35 dB to obtain a second hybrid amplified signal with a power of -5 dBmW. The amplified signal has no distortion. Then, the signal is input to the signal separation circuit. Based on the frequency characteristic differences, the circuit accurately separates the target multi-band radio frequency signal, which includes 1800 MHz of LTE, 2100 MHz of NR, 41 band of 5G NR, and 78 band of 5G NR, as well as the amplitude shift keying signal carrying the fifth-generation uplink and downlink switching information, from the composite signal. The separation loss of both signals is less than 0.3 dBmW.

[0081] Step 303: Based on the optical signal power received by the laser, the optical power signal is converted into an electrical signal and transmitted to the central control unit to obtain the gain command of the central control unit. Then, according to the gain command, the target multi-band radio frequency signal is gain compensated to obtain the gain radio frequency signal.

[0082] Optionally, the coverage unit optical receiving module of the simulated optical distribution system acquires the actual optical power signal of the multi-band optical signal received by the laser through an optical power monitoring component. The optical power monitoring component is a detection device that can detect the power of the optical signal in real time and convert the physical quantity of optical power into a transmittable electrical signal. The optical power monitoring component converts the acquired optical power signal into a corresponding electrical signal and transmits it to the central control unit in real time through an electrical transmission channel. The central control unit pre-stores a target value for optical receiving power, which is a preset standard power value of the optical signal received by the laser to ensure the quality of subsequent signal processing. The central control unit compares the power value corresponding to the received actual optical power electrical signal with the preset target value for optical receiving power, calculates the absolute difference between the two, and multiplies the absolute difference by 2 dB to obtain the gain compensation adjustment value. The central control unit generates a corresponding gain adjustment command based on the calculated gain compensation adjustment value. The gain adjustment command is an electrical signal command containing the digital attenuator attenuation adjustment value, which can be directly recognized and executed by the digital attenuator of the coverage unit optical receiving module.

[0083] The coverage unit's optical receiving module receives gain adjustment commands from the central control unit and inputs the target multi-band RF signal to a gain compensation circuit equipped with a digital attenuator. The digital attenuator is an electronic device that allows adjustment of attenuation via electrical signals to control the RF signal gain. This digital attenuator has a preset initial attenuation value of 20 dB and adjusts in 0.5 dB increments. The gain compensation circuit, according to the gain adjustment commands, controls the digital attenuator to release the corresponding attenuation in preset steps. By adjusting the attenuation, gain compensation for the target multi-band RF signal is achieved, ensuring high linearity and information integrity during the compensation process. After gain compensation, the output power of the gain compensation circuit stabilizes within the preset target optical receiving power range, i.e., the gain RF signal.

[0084] In one embodiment, the optical power monitoring component of the coverage unit's optical receiver module acquires the actual power of the multi-band optical signal received by the laser as -9.5 dBmW, converts it into an electrical signal, and transmits it to the central control unit. The central control unit presets the optical receiver power target value to -7 dBmW, calculates the absolute value difference to be 2.5 dB, multiplies it by 2 dB to obtain a gain compensation adjustment value of 5 dB, and generates a gain adjustment command accordingly. The digital attenuator of the coverage unit's optical receiver module initially has an attenuation value of 20 dB. According to the gain adjustment command, the attenuation is increased by 5 dB in 0.5 dB steps, and the attenuation value is adjusted to 15 dB. The separated target multi-band RF signal is input to the gain compensation circuit, and after adjustment, a 5 dB gain compensation is completed, finally obtaining a gain RF signal with a power stable within the range of -7 dBmW ± 0.5 dBmW.

[0085] Step 304: Detect the amplitude change of the amplitude shift keying signal to obtain the signal level change amplitude. Based on the signal level change amplitude and the preset high and low level duration and digital signal correspondence rules, analyze and restore the amplitude shift keying signal to obtain the uplink and downlink switching control level.

[0086] Optionally, the coverage unit optical receiving module of the simulated optical distribution system inputs the amplitude shift keying (APS) signal to the detection circuit. The detection circuit is a circuit that can detect the amplitude changes of the radio frequency signal in real time and convert the amplitude-changing optical or electrical signal into a recognizable DC level signal. The detection circuit performs real-time amplitude change detection on the APS signal, captures the high and low level change characteristics of the signal in the time domain, and converts the detected amplitude change into the corresponding electrical signal level change amplitude. The signal level change amplitude refers to the power difference and duration characteristics of the high and low levels of the APS signal in the time domain. The detection circuit transmits the obtained signal level change amplitude to the time slot switching control chip. The time slot switching control chip is a dedicated processing chip with signal analysis and restoration functions, which can convert the APS signal into a link switching control level according to preset rules.

[0087] Subsequently, the time slot switching control chip pre-stores the correspondence rules between the duration of high and low levels and digital signals. These rules refer to pre-calibrated fixed recognition rules where high and low levels of different durations correspond to digital signal 1 and digital signal 0, respectively. The rules also include a 0.5 microsecond guard interval, which is the blank time during the high-low level switching process to avoid misjudgment of level identification. According to the preset correspondence rules, the time slot switching control chip analyzes the amplitude of the received signal level changes in real time, identifies the high and low levels of different durations in the amplitude shift keying signal, and converts them into the corresponding digital signals 1 and 0, respectively. Then, based on the combination characteristics of the digital signals, it reconstructs the control information containing the uplink and downlink switching timing of the 5G New Radio signal. Finally, the time slot switching control chip converts the reconstructed control information into high and low level signals that can directly control the link switching of the coverage unit radio frequency module, i.e., the uplink and downlink switching control level. This level is divided into a downlink switching control high level and an uplink switching control low level, which can accurately trigger the time-division duplex time slot switching of the radio frequency circuit.

[0088] Continuing with the above embodiment, the optical receiving module of the coverage unit inputs the separated amplitude shift keying signal to the detection circuit. The circuit detects the signal level change amplitude, which includes a 3.5 microsecond high level and a 1 microsecond low level, with a 0.5 microsecond guard interval between the high and low levels. This feature is transmitted to the time slot switching control chip. The chip has a preset corresponding rule: a 3.5 microsecond high level corresponds to digital signal 1, a 1 microsecond low level corresponds to digital signal 0, and 0.5 microsecond is the guard interval. The chip analyzes the signal level change amplitude according to this rule, restores the 3.5 microsecond high level to the downlink switching control command, restores the 1 microsecond low level to the uplink switching control command, and finally outputs the uplink and downlink switching control levels that can control the switching of the RF link, with a high level for downlink control and a low level for uplink control.

[0089] This invention achieves high-quality conversion and processing of multi-band optical signals to electrical signals through progressive signal processing and precise closed-loop control. It ensures both the power stability and information integrity of radio frequency service signals and completes the accurate parsing and restoration of control signals. This effectively solves problems such as untimely signal attenuation compensation, control signal parsing distortion, and crosstalk in composite signal separation in existing optical receiver modules, thereby improving the signal processing accuracy and stability of optical receiver modules.

[0090] Please see Figure 3 , Figure 3 An embodiment diagram of an electronic device provided in accordance with the present invention. For example... Figure 3 As shown, this embodiment of the invention provides an electronic device 300, including a memory 310, a processor 320, and a computer program 311 stored in the memory 310 and executable on the processor 320. When the processor 320 executes the computer program 311, it performs the following steps: The acquired air interface multi-band radio frequency signals are processed and modulated to obtain the target multi-band radio frequency signals and amplitude shift keying signals; The initial multi-band optical signal is obtained by combining the target multi-band radio frequency signal and the amplitude shift keying signal. The multi-band optical signal is then adjusted and temperature compensated to obtain the target multi-band optical signal. Photoelectric conversion is performed on the target multi-band optical signal to obtain the target multi-band radio frequency signal and amplitude shift keying signal. Gain compensation is performed on the target multi-band radio frequency signal and the amplitude shift keying signal is analyzed and restored to obtain the gain radio frequency signal and the uplink / downlink switching control level, respectively. Based on the uplink and downlink switching control level, the uplink and downlink of the radio frequency circuit are time-slot switched. When the downlink is activated, the gain-based radio frequency signal is pre-processed and then transmitted to the coverage area by the coverage antenna. When the uplink is activated, the uplink radio frequency signal transmitted by the terminal in the coverage area is pre-processed and then transmitted back.

[0091] Please see Figure 4 , Figure 4 An embodiment diagram of a computer-readable storage medium provided in accordance with an embodiment of the present invention is shown. Figure 4 As shown, this embodiment provides a computer-readable storage medium 400 on which a computer program 311 is stored. When the computer program 311 is executed by a processor, it performs the following steps: The acquired air interface multi-band radio frequency signals are processed and modulated to obtain the target multi-band radio frequency signals and amplitude shift keying signals; The initial multi-band optical signal is obtained by combining the target multi-band radio frequency signal and the amplitude shift keying signal. The multi-band optical signal is then adjusted and temperature compensated to obtain the target multi-band optical signal. Photoelectric conversion is performed on the target multi-band optical signal to obtain the target multi-band radio frequency signal and amplitude shift keying signal. Gain compensation is performed on the target multi-band radio frequency signal and the amplitude shift keying signal is analyzed and restored to obtain the gain radio frequency signal and the uplink / downlink switching control level, respectively. Based on the uplink and downlink switching control level, the uplink and downlink of the radio frequency circuit are time-slot switched. When the downlink is activated, the gain-based radio frequency signal is pre-processed and then transmitted to the coverage area by the coverage antenna. When the uplink is activated, the uplink radio frequency signal transmitted by the terminal in the coverage area is pre-processed and then transmitted back.

[0092] On the other hand, the present invention also provides a computer program product, which includes a computer program that can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer is able to execute the control method for the multi-frequency multi-channel analog optical distribution system provided by the above methods, the method including: The acquired air interface multi-band radio frequency signals are processed and modulated to obtain the target multi-band radio frequency signals and amplitude shift keying signals; The initial multi-band optical signal is obtained by combining the target multi-band radio frequency signal and the amplitude shift keying signal. The multi-band optical signal is then adjusted and temperature compensated to obtain the target multi-band optical signal. Photoelectric conversion is performed on the target multi-band optical signal to obtain the target multi-band radio frequency signal and amplitude shift keying signal. Gain compensation is performed on the target multi-band radio frequency signal and the amplitude shift keying signal is analyzed and restored to obtain the gain radio frequency signal and the uplink / downlink switching control level, respectively. Based on the uplink and downlink switching control level, the uplink and downlink of the radio frequency circuit are time-slot switched. When the downlink is activated, the gain-based radio frequency signal is pre-processed and then transmitted to the coverage area by the coverage antenna. When the uplink is activated, the uplink radio frequency signal transmitted by the terminal in the coverage area is pre-processed and then transmitted back.

[0093] The system embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0094] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0095] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A multi-frequency, multi-path analog optical distribution system, characterized in that, It includes an access unit, a coverage unit, and a central control unit. The access unit includes an access unit radio frequency module and an access unit optical transmission module. The coverage unit includes a coverage unit optical reception module and a coverage unit radio frequency module. The central control unit is connected to the access unit radio frequency module, the access unit optical transmission module, the coverage unit optical reception module, and the coverage unit radio frequency module respectively, and manages each module. The access unit radio frequency module is used to process and modulate the acquired air interface multi-band radio frequency signals to obtain the target multi-band radio frequency signals and amplitude shift keying signals; The access unit optical transmission module is used to perform combining and conversion based on the target multi-band radio frequency signal and amplitude shift keying signal to obtain an initial multi-band optical signal, and to adjust and temperature compensate the multi-band optical signal to obtain the target multi-band optical signal; The coverage unit optical receiver module is used to perform photoelectric conversion based on the target multi-band optical signal to obtain the target multi-band radio frequency signal and amplitude shift keying signal. It also performs gain compensation on the target multi-band radio frequency signal and analyzes and restores the amplitude shift keying signal to obtain the gain radio frequency signal and uplink / downlink switching control level, respectively. The coverage unit RF module is connected to perform time slot switching between the uplink and downlink of the RF circuit based on the uplink and downlink switching control level. When the downlink is activated, the gain-based RF signal is pre-processed and transmitted to the coverage area by the coverage antenna. When the uplink is activated, the uplink RF signal transmitted by the terminal in the coverage area is pre-processed and transmitted back.

2. The multi-frequency, multi-path analog optical distribution system according to claim 1, characterized in that, The air interface multi-band radio frequency signal includes multi-band air interface radio frequency signals and 5G new air interface signals. The process of processing and modulating the acquired air interface multi-band radio frequency signal to obtain the target multi-band radio frequency signal and amplitude shift keying signal includes: Based on the aforementioned multi-band radio frequency signal, frequency segmentation and selective filtering are performed to obtain an effective signal after interference is filtered out. The signal is amplified based on the effective signal after filtering out interference to obtain the amplified multi-band radio frequency signal. The target multi-band radio frequency signal is obtained by performing level stabilization control based on the multi-band amplified radio frequency signal. Synchronization block parsing and signal generation are performed based on 5G New Radio signals to obtain the uplink / downlink switching control signal for time slots; Amplitude shift keying is performed based on the uplink / downlink switching control signal of the time slot to obtain the amplitude shift keying signal carrying 5G uplink / downlink switching information.

3. The multi-frequency, multi-path analog optical distribution system according to claim 1, characterized in that, It also includes an optical transmission link connecting the access unit and the coverage unit, wherein the optical transmission link is optically connected to the optical transmitting module of the access unit and the optical receiving module of the coverage unit respectively, and includes an optical power divider for equally splitting the multi-band optical signal output by the optical transmitting module of the access unit and transmitting it to the optical receiving module of the coverage unit; the central control unit is electrically connected to the optical transmitting module of the access unit and the optical receiving module of the coverage unit respectively, and is used to collect the optical emission power, laser operating current, ambient temperature parameters of the optical transmitting module of the access unit, and the optical receiving power parameters of the optical receiving module of the coverage unit, calculate the adjustment amount of each parameter, issue emission power adjustment and temperature compensation commands to the optical transmitting module of the access unit, and issue emission link gain adjustment commands to the optical receiving module of the coverage unit.

4. The multi-frequency, multi-path analog optical distribution system according to claim 1, characterized in that, The initial multi-band optical signal is obtained by combining and converting the target multi-band radio frequency signal and amplitude shift keying signal, including: The target multi-band radio frequency signal and the amplitude shift keying signal are combined to obtain a first hybrid electrical signal; The first hybrid electrical signal is amplified by a high-linearity broadband amplifier tube to obtain a first hybrid amplified signal. Then, the first hybrid amplified signal is converted into an electrical signal by an optical emitting laser to obtain an initial multi-band optical signal.

5. The multi-frequency, multi-path analog optical distribution system according to claim 4, characterized in that, The adjustment and temperature compensation of the multi-band optical signal to obtain the target multi-band optical signal includes: The optical power signal from the optical emitting laser and the temperature signal from the temperature sensor are transmitted to the central processing unit. Based on the preset optical emission power digital-to-analog conversion reference threshold and the digital-to-analog conversion compensation value corresponding to the preset temperature range in the central processing unit, the digital-to-analog conversion value of the laser driving circuit is adjusted to adjust and compensate the temperature of the multi-band optical signal, thereby obtaining the target multi-band optical signal.

6. The multi-frequency, multi-path analog optical distribution system according to claim 1, characterized in that, The process of photoelectric conversion based on the target multi-band optical signal to obtain the target multi-band radio frequency signal and amplitude shift keying signal includes: Based on a photodetector, multi-band optical signals are converted into a second hybrid electrical signal containing target multi-band radio frequency signals and amplitude shift keying signals; The second mixed electrical signal is amplified to obtain a second mixed amplified signal, and the second mixed amplified signal is separated to obtain the target multi-band radio frequency signal and the amplitude shift keying signal; Gain compensation is performed on the target multi-band radio frequency signal, and amplitude shift keying signal is analyzed and restored to obtain the gain radio frequency signal and uplink / downlink switching control level, including: Based on the optical signal power received by the laser, the optical power signal is converted into an electrical signal and transmitted to the central control unit. The gain command of the central control unit is obtained, and the gain compensation of the target multi-band radio frequency signal is performed according to the gain command to obtain the gain radio frequency signal. The amplitude change of the amplitude shift keying signal is detected to obtain the signal level change amplitude. Based on the signal level change amplitude and the preset high and low level duration and digital signal correspondence rules, the amplitude shift keying signal is analyzed and restored to obtain the uplink and downlink switching control level.

7. The multi-frequency, multi-path analog optical distribution system according to claim 1, characterized in that, The preprocessing includes frequency band selective filtering and high linear power amplification.

8. A control method for a multi-frequency, multi-path analog optical distribution system, characterized in that, Applied to the multi-frequency multi-path analog optical distribution system as described in any one of claims 1 to 7; The control method for the multi-frequency, multi-path analog optical distribution system includes: The acquired air interface multi-band radio frequency signals are processed and modulated to obtain the target multi-band radio frequency signals and amplitude shift keying signals; The initial multi-band optical signal is obtained by combining the target multi-band radio frequency signal and the amplitude shift keying signal. The multi-band optical signal is then adjusted and temperature compensated to obtain the target multi-band optical signal. Photoelectric conversion is performed on the target multi-band optical signal to obtain the target multi-band radio frequency signal and amplitude shift keying signal. Gain compensation is performed on the target multi-band radio frequency signal and the amplitude shift keying signal is analyzed and restored to obtain the gain radio frequency signal and the uplink / downlink switching control level, respectively. Based on the uplink and downlink switching control level, the uplink and downlink of the radio frequency circuit are time-slot switched. When the downlink is activated, the gain-based radio frequency signal is pre-processed and then transmitted to the coverage area by the coverage antenna. When the uplink is activated, the uplink radio frequency signal transmitted by the terminal in the coverage area is pre-processed and then transmitted back.

9. An electronic device, characterized in that, include: Memory, used to store computer software programs; A processor is configured to read and execute the computer software program, wherein when the processor executes the computer software program, it implements the control method for the multi-frequency multi-channel analog optical distribution system as described in claim 8.

10. A non-transitory computer-readable storage medium, characterized in that, The storage medium stores a computer software program, which, when executed by a processor, implements the control method for the multi-frequency, multi-channel analog optical distribution system as described in claim 8.

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