Photon type microwave frequency divider with high-precision mode and frequency dividing method thereof

Abstract

The invention discloses a photon type microwave frequency divider with a high-precision mode and a frequency dividing method thereof, and relates to the field of frequency dividers. The photon type microwave frequency divider with the high-precision mode comprises an input module, a dual-mode electro-optical modulator, a photoelectric oscillation loop, a control unit and an output module. According to the photon type microwave frequency divider with the high-precision mode and the frequency division method thereof, carrier suppression double-sideband and single-sideband dual-mode work is realized by adopting the double parallel Mach-Zehnder modulators, the frequency division range of 10 MHz to 40 GHz is covered, and the frequency band expansion capability is improved by more than 50% compared with that of a traditional scheme; a closed-loop phase locking algorithm enables the phase noise to be reduced to-120 dBc / Hz or below at the 10kHz offset position, and the phase noise is improved by 20 dB compared with an open-loop system; the modulation mode is automatically selected based on the input frequency, and the spurious suppression ratio of the transition zone reaches 45dB, which is improved by 15dB compared with a fixed mode scheme.

Description

Technical Field

[0001] The present invention relates to the technical field of frequency dividers, and particularly to a photonic microwave frequency divider with a high-precision mode and its frequency division method. Background Art

[0002] In the fields of microwave communication, radar detection, and electronic countermeasure, etc., microwave frequency division technology with high spectral purity and large dynamic range is a key bottleneck. Traditional electronic frequency dividers are limited by the carrier mobility of solid-state electronic devices and face inherent defects such as a decrease in frequency division accuracy in the high-frequency band, severe spurious interference, and limited bandwidth. For example:

[0003] Contradiction between accuracy and bandwidth: Electronic frequency dividers based on non-linear devices need to sacrifice the frequency division ratio to maintain accuracy in the high-frequency band (>30 GHz), and it is difficult to achieve broadband coverage;

[0004] Sensitive to electromagnetic interference: The phase noise deteriorates sharply in a complex electromagnetic environment, making it difficult to meet the requirements of modern communication systems for signal-to-noise ratio;

[0005] Rigid mode switching: It is necessary to manually adjust the bias network to switch the frequency division mode, and it cannot adapt to the characteristics of dynamically changing input signals.

[0006] The photonic microwave frequency divider proposed by the present invention breaks through the physical limitations of traditional electronic frequency dividers by introducing a dual-mode electro-optic modulation and a closed-loop phase control architecture. It innovatively combines the high-frequency advantages of microwave photonics and the adaptive characteristics of a closed-loop control system, providing a new paradigm for solving the above contradictions. Summary of the Invention

[0007] Aiming at the deficiencies of the prior art, the present invention provides a photonic microwave frequency divider with a high-precision mode and its frequency division method, which solves the inherent problems of traditional electronic frequency dividers being limited by the carrier mobility of solid-state electronic devices, facing a decrease in frequency division accuracy in the high-frequency band, severe spurious interference, and limited bandwidth.

[0008] To achieve the above object, the present invention is realized through the following technical solutions: A photonic microwave frequency divider with a high-precision mode, comprising:

[0009] An input module, which is used to receive a microwave signal to be frequency-divided and a continuous-wave optical carrier;

[0010] A dual-mode electro-optic modulator, which is used to receive the optical carrier and the microwave signal input by the input module, and modulate the microwave signal onto the optical carrier to generate a modulated optical signal;

[0011] An optoelectronic oscillation loop, which is used to receive the modulated optical signal generated by the dual-mode electro-optic modulator, convert the modulated optical signal into an electrical signal, amplify, filter, and phase-shift it, and then feedback it to the dual-mode electro-optic modulator to maintain oscillation and generate a frequency-divided signal;

[0012] A control unit that automatically selects a modulation mode according to the input signal frequency and adjusts the phase shifter parameters to optimize the phase condition;

[0013] An output module for outputting the frequency-divided microwave signal and monitoring the feedback signal to optimize the performance of the frequency divider.

[0014] Preferably, the input module includes a microwave input port and an optical carrier input port.

[0015] Preferably, the dual-mode electro-optic modulator adopts a dual-parallel Mach-Zehnder modulator, supporting two modes: carrier-suppressed double-sideband modulation and single-sideband modulation:

[0016] Carrier-suppressed double-sideband modulation: Suppress the optical carrier and generate ±1st-order sidebands, suitable for low frequency bands;

[0017] Single-sideband modulation: Only retain a single sideband to reduce spurious interference, suitable for high frequency bands.

[0018] Preferably, the optoelectronic oscillation loop includes:

[0019] A push-pull Mach-Zehnder modulator operating at the minimum transmission point to enhance the nonlinear effect;

[0020] An optoelectronic detector that converts the optical signal into an electrical signal;

[0021] A microwave amplifier that amplifies the electrical signal;

[0022] A broadband filter that filters out unwanted frequency components;

[0023] A phase shifter that adjusts the signal phase;

[0024] A power splitter: divides the signal into two paths, one path is fed back to the dual-mode electro-optic modulator, and the other path outputs the frequency-divided signal.

[0025] Preferably, the control unit includes:

[0026] A mode selector that automatically switches the mode of the dual-mode electro-optic modulator according to the input signal frequency;

[0027] A phase shifter controller that monitors the phase error of the feedback signal and dynamically adjusts the parameters of the phase shifter to optimize the phase condition.

[0028] Preferably, the output module includes a frequency-divided signal output port and a feedback signal monitoring port.

[0029] A frequency division method for a photonic microwave frequency divider with a high-precision mode, the frequency division method comprising the following steps:

[0030] Step 1: Input signal parameters, and receive the frequency and power parameters of the microwave signal to be frequency-divided;

[0031] Step 2: Select the initial mode, set the parameters of the control unit, and select the initial modulation mode, such as carrier-suppressed double-sideband modulation or single-sideband modulation;

[0032] Step 3: The laser outputs an optical carrier. The laser generates a continuous-wave optical carrier and injects it into the dual-mode electro-optic modulator;

[0033] Step 4: Modulate the microwave signal. The microwave signal is divided into two paths by a power divider and injected into the upper and lower arms of the dual-parallel Mach-Zehnder modulator;

[0034] Step 5: Generate the modulated optical signal. Generate the corresponding modulated optical signal according to the current mode;

[0035] Step 6: Photoelectric conversion and amplification. The modulated optical signal is converted into an electrical signal by a photodetector and then amplified by an amplifier;

[0036] Step 7: Filtering and phase shifting. The electrical signal passes through a broadband filter to filter out unwanted frequency components, and the phase shifter adjusts the signal phase;

[0037] Step 8: Signal feedback and frequency division output. Part of the signal is fed back to the dual-mode electro-optic modulator to maintain oscillation, and the frequency-divided signal is output through the output port;

[0038] Step 9: Monitor the frequency-divided signal and monitor the power and phase noise parameters of the output signal;

[0039] Step 10: Mode switching judgment:

[0040] Yes: If the input frequency changes, the control unit switches the modulation mode;

[0041] No: Keep the current mode and enter the phase control judgment;

[0042] Step 11: Phase control judgment:

[0043] Yes: If the phase error of the feedback signal exceeds the threshold, start the phase-locking algorithm and adjust the parameters of the phase shifter;

[0044] No: Keep the current phase setting and enter the fault recovery judgment;

[0045] Step 12: Fault recovery judgment

[0046] Yes: If a sudden drop in signal power or excessive phase noise is detected, start the fault recovery program;

[0047] No: Continue to monitor the frequency-divided signal and return to Step 10;

[0048] Step 13: End. Stop the frequency divider and complete the work process.

[0049] Preferably, the judgment logic for mode switching in step ten is specifically as follows:

[0050] Condition: Whether the input signal frequency exceeds the threshold of 30 GHz;

[0051] Action:

[0052] If the frequency ≤ 20 GHz, select the carrier-suppressed double-sideband modulation mode with high modulation efficiency;

[0053] If the frequency > 30 GHz, switch to the single-sideband modulation mode to reduce spurious interference;

[0054] Execute the action: Adjust the bias voltage of the dual-mode electro-optic modulator to switch the modulation mode.

[0055] Preferably, the judgment logic for phase control in step eleven is specifically as follows:

[0056] Monitoring parameters: Phase error of the feedback signal, loop gain;

[0057] Algorithm flow:

[0058] Calculate the phase error and compare it with the preset threshold of 5°;

[0059] If the error exceeds the threshold, start the phase-locking algorithm and dynamically adjust the parameters of the phase shifter;

[0060] Iteratively optimize until the phase error is stable within the threshold.

[0061] Preferably, the judgment logic for fault recovery in step twelve is specifically as follows:

[0062] Detection of anomalies: Sudden drop in signal power, excessive phase noise;

[0063] Recovery measures:

[0064] Automatically switch to the redundant laser to ensure the stability of the optical carrier;

[0065] Restart the phase-locking algorithm and recalibrate the parameters of the phase shifter.

[0066] The present invention discloses a photonic microwave frequency divider with high precision mode and its frequency division method, and the beneficial effects thereof are as follows:

[0067] 1. The photonic microwave frequency divider with high-precision mode uses a dual-parallel Mach-Zehnder modulator to achieve carrier-suppressed double-sideband and single-sideband dual-mode operation, covering a frequency division range of 10 MHz - 40 GHz. The frequency band expansion ability is improved by more than 50% compared with the traditional scheme; the closed-loop phase-locking algorithm reduces the phase noise to below -120 dBc / Hz at a 10 kHz offset, improving by 20 dB compared with the open-loop system; based on the input frequency, the modulation mode is automatically selected, and the transition band spurious suppression ratio reaches 45 dB, improving by 15 dB compared with the fixed-mode scheme.

[0068] 2. The photonic microwave frequency divider with high-precision mode has a push-pull Mach-Zehnder modulator operating at the minimum transmission point to enhance the non-linear effect, modulating the input optical signal into a modulated optical signal containing microwave information. Its output end is connected to a photodetector, which converts the modulated optical signal into a microwave electrical signal. Its output end is connected to a microwave amplifier, which amplifies the weak microwave electrical signal to increase the signal power. Its output end is connected to a broadband filter, which filters out out-of-band noise and spurious frequencies and retains the signal in the target frequency band. Its output end is connected to a phase shifter, which adjusts the signal phase to ensure loop phase balance. Its output end is connected to a power splitter, which divides the signal into two paths. The feedback path returns to the push-pull Mach-Zehnder modulator to form a closed-loop oscillation, and the output path outputs the frequency-divided microwave signal. BRIEF DESCRIPTION OF THE DRAWINGS

[0069] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0070] Figure 1 It is a schematic diagram of the overall architecture of the present invention;

[0071] Figure 2 It is a schematic diagram of the overall process of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0072] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described below. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0073] Embodiments of the present application provide a photonic microwave frequency divider with a high-precision mode and its frequency division method, which solve the inherent problems of traditional electronic frequency dividers being limited by the carrier mobility of solid-state electronic devices, facing issues such as a decline in frequency division accuracy in the high-frequency band, severe spurious interference, and limited bandwidth. A dual-parallel Mach-Zehnder modulator is used to achieve dual-mode operation of carrier-suppressed double sideband and single sideband, covering a frequency division range of 10 MHz - 40 GHz, with the frequency band expansion ability increased by more than 50% compared to traditional solutions; the closed-loop phase-locking algorithm reduces the phase noise to below -120 dBc / Hz at a 10 kHz offset, improving by 20 dB compared to the open-loop system; the modulation mode is automatically selected based on the input frequency, and the spurious suppression ratio in the transition band reaches 45 dB, improving by 15 dB compared to the fixed-mode solution.

[0074] To better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings of the specification and specific implementation manners.

[0075] Embodiments of the present invention disclose a photonic microwave frequency divider with a high-precision mode and its frequency division method.

[0076] According to the attached Figure 1-2 As shown, the photonic microwave frequency divider with a high-precision mode includes:

[0077] An input module for receiving a microwave signal to be frequency-divided and a continuous-wave optical carrier;

[0078] A dual-mode electro-optic modulator for receiving the optical carrier and the microwave signal input by the input module, and modulating the microwave signal onto the optical carrier to generate a modulated optical signal;

[0079] An optoelectronic oscillation loop for receiving the modulated optical signal generated by the dual-mode electro-optic modulator, converting the modulated optical signal into an electrical signal, amplifying, filtering, and phase-shifting it, and then feeding it back to the dual-mode electro-optic modulator to maintain oscillation and generate a frequency-divided signal;

[0080] A control unit for automatically selecting a modulation mode according to the input signal frequency and adjusting the phase shifter parameters to optimize the phase condition;

[0081] An output module for outputting the frequency-divided microwave signal and monitoring the feedback signal to optimize the performance of the frequency divider.

[0082] Further, the input module includes a microwave input port and an optical carrier input port.

[0083] Further, the dual-mode electro-optic modulator uses a dual-parallel Mach-Zehnder modulator, supporting two modes: carrier-suppressed double-sideband modulation and single-sideband modulation:

[0084] Carrier-suppressed double-sideband modulation: suppressing the optical carrier and generating ±1st order sidebands, suitable for the low-frequency band;

[0085] Single-sideband modulation: Only one sideband is retained, reducing spurious interference and applicable to high-frequency bands.

[0086] Specifically disclosed, the optoelectronic oscillation loop includes:

[0087] A push-pull Mach-Zehnder modulator, operating at the minimum transmission point to enhance the nonlinear effect;

[0088] An optoelectronic detector that converts an optical signal into an electrical signal;

[0089] A microwave amplifier that amplifies the electrical signal;

[0090] A broadband filter that filters out unwanted frequency components;

[0091] A phase shifter that adjusts the signal phase;

[0092] A power splitter: divides the signal into two paths, one path is fed back to the dual-mode electro-optic modulator, and the other path outputs the frequency-divided signal.

[0093] The push-pull Mach-Zehnder modulator operates at the minimum transmission point to enhance the nonlinear effect, modulates the input optical signal into a modulated optical signal containing microwave information, its output terminal is connected to the optoelectronic detector, the optoelectronic detector converts the modulated optical signal into a microwave electrical signal, its output terminal is connected to the microwave amplifier, the microwave amplifier amplifies the weak microwave electrical signal to increase the signal power, its output terminal is connected to the broadband filter, the broadband filter filters out out-of-band noise and spurious frequencies and retains the signal in the target frequency band, its output terminal is connected to the phase shifter, the phase shifter adjusts the signal phase to ensure the loop phase balance, its output terminal is connected to the power splitter, the power splitter divides the signal into two paths, the feedback path returns to the push-pull Mach-Zehnder modulator to form a closed-loop oscillation, and the output path outputs the frequency-divided microwave signal.

[0094] Furthermore, the control unit includes:

[0095] A mode selector that automatically switches the mode of the dual-mode electro-optic modulator according to the input signal frequency;

[0096] A phase shifter controller that monitors the phase error of the feedback signal and dynamically adjusts the parameters of the phase shifter to optimize the phase condition.

[0097] Furthermore, the output module includes a frequency-divided signal output port and a feedback signal monitoring port.

[0098] A dual-parallel Mach-Zehnder modulator is used to achieve carrier-suppressed double-sideband and single-sideband dual-mode operation, covering a frequency division range of 10 MHz - 40 GHz. The frequency band expansion ability is increased by more than 50% compared with traditional solutions; the closed-loop phase-locking algorithm reduces the phase noise to below -120 dBc / Hz at a 10 kHz offset, improving by 20 dB compared with the open-loop system; the modulation mode is automatically selected based on the input frequency, and the spurious suppression ratio in the transition band reaches 45 dB, improving by 15 dB compared with the fixed-mode solution.

[0099] A frequency division method for a photonic microwave frequency divider with a high-precision mode, the frequency division method comprising the following steps:

[0100] Step 1, input signal parameters, receiving the frequency and power parameters of the microwave signal to be frequency-divided;

[0101] Step 2, select the initial mode, set the control unit parameters, and select the initial modulation mode, such as carrier-suppressed double-sideband modulation or single-sideband modulation;

[0102] Step 3, the laser outputs an optical carrier, the laser generates a continuous-wave optical carrier and injects it into the dual-mode electro-optic modulator;

[0103] Step 4, microwave signal modulation, the microwave signal is divided into two paths by an electric power splitter and injected into the upper and lower arms of the dual-parallel Mach-Zehnder modulator;

[0104] Step 5, generate a modulated optical signal, and generate a corresponding modulated optical signal according to the current mode;

[0105] Step 6, photoelectric conversion and amplification, the modulated optical signal is converted into an electrical signal by a photodetector and then amplified by an amplifier;

[0106] Step 7, filtering and phase shifting, the electrical signal passes through a broadband filter to filter out unnecessary frequency components, and a phase shifter adjusts the signal phase;

[0107] Step 8, signal feedback and frequency division output, part of the signal is fed back to the dual-mode electro-optic modulator to maintain oscillation, and the frequency-divided signal is output through the output port;

[0108] Step 9, monitor the frequency-divided signal, and monitor the power and phase noise parameters of the output signal;

[0109] Step 10, mode switching judgment:

[0110] Yes: If the input frequency changes, the control unit switches the modulation mode;

[0111] No: Maintain the current mode and enter the phase control judgment;

[0112] Step 11, phase control judgment:

[0113] Yes: If the phase error of the feedback signal exceeds the threshold, start the phase-locking algorithm and adjust the phase shifter parameters;

[0114] No: Keep the current phase setting and enter the fault recovery judgment;

[0115] Step Twelve, Fault Recovery Judgment

[0116] Yes: If a sudden drop in signal power or excessive phase noise is detected, start the fault recovery program;

[0117] No: Continue to monitor the divided-frequency signal and return to Step Ten;

[0118] Step Thirteen, End, Stop the frequency divider and complete the work process.

[0119] Specifically disclosed, the judgment logic of the mode switching in Step Ten is as follows:

[0120] Condition: Whether the input signal frequency exceeds the threshold of 30 GHz;

[0121] Action:

[0122] If the frequency ≤ 20 GHz, select the carrier-suppressed double-sideband modulation mode with high modulation efficiency;

[0123] If the frequency > 30 GHz, switch to the single-sideband modulation mode to reduce spurious interference;

[0124] Execute the action: Adjust the bias voltage of the dual-mode electro-optic modulator and switch the modulation mode

[0125] The hybrid modulation mode is automatically enabled in the transition range of 20 GHz - 30 GHz.

[0126] Specifically disclosed, the judgment logic of the phase control in Step Eleven is as follows:

[0127] Monitoring parameters: Phase error of the feedback signal, loop gain;

[0128] Algorithm flow:

[0129] Calculate the phase error and compare it with the preset threshold of 5°;

[0130] If the error exceeds the threshold, start the phase-locking algorithm and dynamically adjust the phase shifter parameters;

[0131] Iteratively optimize until the phase error is stabilized within the threshold.

[0132] When the phase error of the feedback signal exceeds the threshold, start the phase-locking algorithm, iteratively calculate the optimal phase shift value using the LMS algorithm, complete one phase calibration every 10 ms, and the convergence speed is 3 times faster than the traditional method.

[0133] Specifically disclosed, the judgment logic for step twelve fault recovery is specifically as follows:

[0134] Detect anomalies: sudden drop in signal power, excessive phase noise;

[0135] Recovery measures:

[0136] Automatically switch to the redundant laser to ensure the stability of the optical carrier;

[0137] Restart the phase-locking algorithm and recalibrate the phase shifter parameters.

[0138] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A photonic microwave frequency divider with a high-precision mode, characterized in that, Comprising: An input module, which is used to receive a microwave signal to be frequency-divided and a continuous optical carrier wave; A dual-mode electro-optic modulator, which is used to receive the optical carrier wave and the microwave signal input by the input module, and modulate the microwave signal onto the optical carrier wave to generate a modulated optical signal; An optoelectronic oscillation loop, which is used to receive the modulated optical signal generated by the dual-mode electro-optic modulator, convert the modulated optical signal into an electrical signal, amplify, filter, and phase-shift it, and then feedback it back to the dual-mode electro-optic modulator to maintain oscillation and generate a frequency-divided signal; A control unit, which automatically selects a modulation mode according to the input signal frequency and adjusts the phase shifter parameters to optimize the phase condition; An output module, which is used to output the frequency-divided microwave signal and monitor the feedback signal to optimize the performance of the frequency divider.

2. The photon-based microwave frequency divider with a high-precision mode according to claim 1, characterized in that, The input module includes a microwave input port and an optical carrier input port.

3. The photonic microwave frequency divider with a high-precision mode according to claim 1, characterized in that, The dual-mode electro-optic modulator uses a dual-parallel Mach-Zehnder modulator, which supports two modes: carrier-suppressed double-sideband modulation and single-sideband modulation: Carrier-suppressed double-sideband modulation: suppress the optical carrier and generate ±1-order sidebands, which is suitable for low-frequency bands; Single-sideband modulation: only retain a single sideband to reduce spurious interference, which is suitable for high-frequency bands.

4. The photonic microwave frequency divider with a high-precision mode according to claim 1, characterized in that, The optoelectronic oscillation loop includes: A push-pull Mach-Zehnder modulator, which operates at the minimum transmission point to enhance the nonlinear effect; An optoelectronic detector, which converts the optical signal into an electrical signal; A microwave amplifier, which amplifies the electrical signal; A broadband filter, which filters out unwanted frequency components; A phase shifter, which adjusts the signal phase; A power splitter: divides the signal into two paths, one path is feedback back to the dual-mode electro-optic modulator, and the other path outputs the frequency-divided signal.

5. The photonic microwave frequency divider with a high-precision mode according to claim 4, wherein The control unit includes: A mode selector, which automatically switches the mode of the dual-mode electro-optic modulator according to the input signal frequency; A phase shifter controller, which is used to monitor the phase error of the feedback signal, dynamically adjust the parameters of the phase shifter, and optimize the phase condition.

6. The photonic microwave frequency divider with a high-precision mode according to claim 1, characterized in that The output module includes a frequency-divided signal output port and a feedback signal monitoring port.

7. The frequency division method of the photon-type microwave frequency divider with a high-precision mode according to any one of claims 1-6, characterized in that The frequency division method includes the following steps: Step 1, input signal parameters, receive the frequency and power parameters of the microwave signal to be frequency-divided; Step 2, select the initial mode, set the parameters of the control unit, and select the initial modulation mode, such as carrier-suppressed double-sideband modulation or single-sideband modulation; Step 3, the laser outputs an optical carrier wave, the laser generates a continuous optical carrier wave and injects it into the dual-mode electro-optic modulator; Step 4, microwave signal modulation, the microwave signal is divided into two paths by an electrical power splitter and injected into the upper and lower arms of the dual-parallel Mach-Zehnder modulator; Step 5, generate a modulated optical signal, and generate a corresponding modulated optical signal according to the current mode; Step 6, optoelectronic conversion and amplification, the modulated optical signal is converted into an electrical signal by an optoelectronic detector and then amplified by an amplifier; Step 7, filtering and phase shifting, the electrical signal passes through a broadband filter to filter out unwanted frequency components, and the phase shifter adjusts the signal phase; Step 8, signal feedback and frequency division output, part of the signal is feedback back to the dual-mode electro-optic modulator to maintain oscillation, and the frequency-divided signal is output through the output port; Step 9, monitor the frequency-divided signal, monitor the power and phase noise parameters of the output signal; Step 10, mode switching judgment: Yes: If the input frequency changes, the control unit switches the modulation mode; No: Keep the current mode and enter the phase control judgment; Step Eleven: Phase Control Judgment: Yes: If the phase error of the feedback signal exceeds the threshold, start the phase-locking algorithm and adjust the phase shifter parameters; No: Maintain the current phase setting and enter the fault recovery judgment; Step Twelve: Fault Recovery Judgment Yes: If a sudden drop in signal power or excessive phase noise is detected, start the fault recovery program; No: Continue to monitor the divided-frequency signal and return to Step Ten; Step Thirteen: End, stop the frequency divider, and complete the work process.

8. The frequency division method of the photon-type microwave frequency divider with a high-precision mode according to claim 7, characterized in that The judgment logic for mode switching in Step Ten is specifically as follows: Condition: Whether the input signal frequency exceeds the threshold of 30 GHz; Action: If the frequency ≤ 20 GHz, select the carrier-suppressed double-sideband modulation mode with high modulation efficiency; If the frequency > 30 GHz, switch to the single-sideband modulation mode to reduce spurious interference; Execute the action: Adjust the bias voltage of the dual-mode electro-optic modulator and switch the modulation mode.

9. The frequency division method of the photonic microwave frequency divider with a high-precision mode according to claim 7, characterized in that, The judgment logic for phase control in Step Eleven is specifically as follows: Monitored parameters: Phase error of the feedback signal, loop gain; Algorithm flow: Calculate the phase error and compare it with the preset threshold of 5°; If the error exceeds the threshold, start the phase-locking algorithm and dynamically adjust the phase shifter parameters; Iteratively optimize until the phase error is stabilized within the threshold.

10. The frequency division method of the photon-type microwave frequency divider with a high-precision mode according to claim 7, characterized in that, The judgment logic for fault recovery in Step Twelve is specifically as follows: Detect anomalies: Sudden drop in signal power, excessive phase noise; Recovery measures: Automatically switch to the redundant laser to ensure the stability of the optical carrier; Restart the phase-locking algorithm and recalibrate the phase shifter parameters.

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