A multi-mode four-wave mixing automatic mode locking device and method

Abstract

The present invention discloses a multimode four-wave mixing (FWM) automatic mode-locking device and method. The device comprises: a host computer, an electric polarization controller, a spatiotemporal mode-locked laser, an oscilloscope, and a spectrometer. The host computer is connected to the spatiotemporal mode-locked laser; the electric polarization controller is located within the spatiotemporal mode-locked laser; the inputs of the oscilloscope and spectrometer are connected to the spatiotemporal mode-locked laser, and the outputs of the oscilloscope and spectrometer are connected to the host computer. The host computer is configured to output a voltage to control the electric polarization controller, acquire data from the oscilloscope and spectrometer, and execute a FWM automatic mode-locking algorithm. The electric polarization controller receives a voltage signal from the host computer, regulates the polarization state and fiber length of the spatiotemporal mode-locked laser, and changes the energy coupling between different transverse modes within the spatiotemporal mode-locked laser. The present invention achieves automatic mode-locking of FWM by automatically detecting the FWM phenomenon.

Description

Technical Field

[0001] The present invention relates to the technical field of mode-locked lasers and automatic control, and in particular to a multi-mode four-wave mixing automatic mode-locking device and method. Background Art

[0002] Traditional mode-locked fiber lasers use single-mode fiber, while space-time mode-locked fiber lasers use multimode fiber, which can transmit multiple transverse modes. Transverse modes refer to different spatial modes of the light field, that is, the intensity distribution on the cross section of the laser beam. Space-time mode locking refers to the synchronous locking of the longitudinal mode and the transverse mode, that is, the synchronous locking of time and space. By fusing multimode fiber with single-mode / few-mode fiber, or by staggered fusing between multimode fibers, a multimode interference filtering effect can be generated to filter the wavelength of the laser pulse. By adjusting the polarization controller on the multimode fiber, the multimode interference filtering effect can be used to generate a variety of pulse phenomena, such as wavelength tuning, multi-wavelength, four-wave mixing, etc. Among them, the polarization controller is a device used to adjust the state of the laser.

[0003] Traditional laser mode locking requires researchers to manually adjust the polarization controller and observe the phenomena in the detection instrument to achieve mode-locked pulses, which consumes a lot of time and human resources. Automatic mode locking uses a program to control the electric polarization controller, obtain experimental data from the detection instrument, and score the experimental data using an evaluation function. The program then uses an intelligent algorithm (such as a genetic algorithm) based on the score to determine the next adjustment of the electric polarization controller, thus achieving intelligent mode locking and saving manpower and material resources. The evaluation function is a formula written based on the target phenomenon. Typically, the electric polarization controller requires a set of voltage values ​​as input, called an individual, which includes three voltage values, each controlling three components.

[0004] Currently, automatic mode locking is only applied to single-mode fiber mode-locked lasers. There is no automatic mode locking for multimode fiber mode-locked lasers (spatiotemporal mode-locked lasers), nor is there an application for automatic mode locking of four-wave mixing. Furthermore, when using traditional genetic algorithms to automatically mode-lock multimode fiber mode-locked lasers, it is easy to lock onto individuals in the laser that occupy a wide range of voltage values ​​for the electric polarization controller, resulting in a relatively simple experimental phenomenon and hindering the tuning of automatic mode locking. Summary of the Invention

[0005] The purpose of the present invention is to provide a multimode four-wave mixing automatic mode locking device and method, which overcomes the defect that the existing technology cannot achieve four-wave mixing automatic mode locking by identifying the four-wave mixing spectrum.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] A multimode four-wave mixing automatic mode-locking device includes a host computer, an electric polarization controller, a spatiotemporal mode-locked laser, an oscilloscope, and a spectrometer; wherein the electric polarization controller is located in the spatiotemporal mode-locked laser; the host computer is connected to the electric polarization controller; the input ends of the oscilloscope and the spectrometer are connected to the spatiotemporal mode-locked laser, and the output ends of the oscilloscope and the spectrometer are connected to the host computer;

[0008] The host computer is used to output voltage to control the electric polarization controller, obtain data from the oscilloscope and spectrometer, and execute the four-wave mixing automatic mode locking algorithm;

[0009] The electric polarization controller receives voltage signals from the host computer, adjusts the polarization state and fiber length of the spatiotemporal mode-locked laser, and changes the energy coupling of different transverse modes in the spatiotemporal mode-locked laser;

[0010] A spatiotemporal mode-locked laser is used to output mode-locked pulses of different phenomena under the control of an electric polarization controller, and the output laser is split into two paths through an optical coupler and transmitted to an oscilloscope and a spectrometer respectively;

[0011] an oscilloscope, used to receive the time domain signal from the spatiotemporal mode-locked laser and output the time domain image and data of the laser;

[0012] The spectrometer is used to receive the spectral signal from the spatiotemporal mode-locked laser and output the spectral image and data of the laser.

[0013] A multi-mode four-wave mixing automatic mode locking method is applied to the multi-mode four-wave mixing automatic mode locking device described above, comprising the following steps:

[0014] S1: The host computer randomly selects a voltage value interval and chooses an initial voltage value to control the electric polarization controller to regulate the output state of the spatiotemporal mode-locked laser.

[0015] S2. The oscilloscope receives the laser signal output by the spatiotemporal mode-locked laser and transmits the time domain signal of the optical signal to the host computer. The host computer identifies the time domain signal and then implements automatic mode-locking operation through a genetic algorithm.

[0016] S3. The spectrometer receives the laser signal output by the spatiotemporal mode-locked laser and transmits the spectral image and data of the laser to the host computer. The host computer calls the wavelength multiplexing analysis program of the spectrometer to determine whether the spectral information is four-wave mixing and calculates the output state of the four-wave mixing.

[0017] S4. If the output state does not meet the preset target state, the voltage value interval is changed and the initial population is reselected until the four-wave mixing output state meets the preset target state;

[0018] S5. If the four-wave mixing output state meets the preset target state, the automatic mode locking of the multi-mode four-wave mixing is terminated.

[0019] Preferably, in S2, the host computer discriminates the time domain signal and then implements the automatic mode locking operation through the genetic algorithm, specifically including:

[0020] After the host computer obtains the time domain data from the oscilloscope, it performs peak detection and determines the peaks with intensity greater than the specified threshold as pulses, thereby obtaining the number of pulses. The average pulse amplitude and jitter are calculated by the peak amplitude of the pulses. The number of pulses, the average pulse amplitude and the jitter are weighted and scored. The sum obtained is the time domain signal score of the laser output phenomenon at this voltage value. The closer to the mode-locked pulse state, the higher the score. The genetic algorithm will perform inheritance, crossover and mutation operations based on the time domain signal score until the output of the mode-locked pulse is achieved.

[0021] Preferably, in S2, the genetic algorithm used is a regional genetic algorithm, which divides the voltage value range of the electric polarization controller into several intervals, randomly selects one of the intervals to generate an initial population, and performs crossover, mutation and genetic operations of the genetic algorithm until the mode-locked pulse output is achieved.

[0022] Preferably, in S3, the host computer calls the wavelength multiplexing analysis program of the spectrometer to determine whether the spectrum information is four-wave mixing, and calculates the output state of the four-wave mixing, specifically including:

[0023] The host computer calls the wavelength division multiplexing analysis program of the spectrometer to obtain the wavelength and level information of the spectrum peaks greater than the specified threshold in the spectrum; the wavelength intervals of adjacent spectrum peaks are calculated, and when three consecutive identical wavelength intervals appear, it is determined to be four-wave mixing (FWM); the wavelengths of the corresponding spectrum peaks are extracted to form a FWM wavelength group, and then the number of wavelengths and wavelength intervals of FWM are obtained. The wavelengths in the FWM wavelength group are averaged to obtain the central wavelength.

[0024] Preferably, in S4-S5, different operations are performed according to whether the four-wave mixing output state meets the preset target state, specifically including:

[0025] The host computer determines whether it is four-wave mixing by judging the four-wave mixing spectrum, and calculates whether the number of wavelengths, wavelength interval and center wavelength of the four-wave mixing meet the preset target state. If it is not four-wave mixing that meets the target conditions, the patience value is reduced by 1 and the search is restarted; when the patience value is 0, the next voltage value interval is changed for operation; if it meets the preset target state, the automatic locking of the multi-mode four-wave mixing is terminated.

[0026] The present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, a multi-mode four-wave mixing automatic mode locking method as described above is implemented.

[0027] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0028] The multimode four-wave mixing (FWM) automatic mode-locking device and method provided by the present invention automatically detects FWM phenomena and enables automatic mode-locking of FWM. By identifying the FWM spectrum, this overcomes the drawback of existing technologies that prevent automatic FWM mode-locking. The proposed regional genetic algorithm, utilizing the multimode interference filtering effect, can search for laser states over a wider range, making it easier to find the target FWM state. Furthermore, it can search for more experimental phenomena of spatiotemporally mode-locked lasers, facilitating automatic mode-locking of FWM at different preset target states. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 A schematic diagram of a multi-mode four-wave mixing automatic mode locking device provided by the present invention;

[0031] Figure 2 A flow chart of a multi-mode four-wave mixing automatic mode locking method provided by the present invention;

[0032] Figure 3 This is the four-wave mixing spectrum distribution diagram identified by the present invention. DETAILED DESCRIPTION

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0034] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] like Figure 1As shown, the present invention provides a multi-mode four-wave mixing automatic mode-locking device, comprising a host computer, an electric polarization controller, a spatiotemporal mode-locked laser, an oscilloscope, and a spectrometer; wherein the electric polarization controller is located in the spatiotemporal mode-locked laser; the host computer is connected to the electric polarization controller; the input ends of the oscilloscope and the spectrometer are connected to the spatiotemporal mode-locked laser, and the output ends of the oscilloscope and the spectrometer are connected to the host computer;

[0036] The host computer is used to output voltage to control the electric polarization controller, obtain data from the oscilloscope and spectrometer, and execute the four-wave mixing automatic mode locking algorithm;

[0037] The electric polarization controller is used to receive voltage signals from the host computer, regulate the polarization state and fiber length of the space-time mode-locked laser, and change the energy coupling of different transverse modes in the space-time mode-locked laser. Under different voltage input values, the polarization state of the laser in the laser is regulated, the fiber length is fine-tuned, the energy coupling of different transverse modes changes, and the laser will output different phenomena.

[0038] A spatiotemporally mode-locked laser is used to achieve mode-locked pulse output with various phenomena under the control of an electric polarization controller. The output laser is split into two paths via an optical coupler, one received by an oscilloscope and the other by a spectrometer. Experimental phenomena include, but are not limited to, single-wavelength and multi-wavelength mode-locked pulses, as well as four-wave mixing mode-locked pulses with varying numbers of wavelengths, center wavelengths, and wavelength spacings.

[0039] an oscilloscope, used to receive the time domain signal from the spatiotemporal mode-locked laser and output the time domain image and data of the laser;

[0040] The spectrometer is used to receive the spectral signal from the spatiotemporal mode-locked laser and output the spectral image and data of the laser.

[0041] like Figure 2 As shown, the present invention provides a multi-mode four-wave mixing automatic mode locking method, which is applied to the above-mentioned multi-mode four-wave mixing automatic mode locking device, comprising the following steps:

[0042] S1: The host computer randomly selects a voltage value interval and chooses an initial voltage value to control the electric polarization controller to regulate the output state of the spatiotemporal mode-locked laser.

[0043] S2, the oscilloscope receives the laser signal output by the spatiotemporal mode-locked laser and transmits the laser's time-domain image and data to the host computer. The host computer identifies the time-domain signal and then implements automatic mode-locking operation through a genetic algorithm.

[0044] S3. The spectrometer receives the laser signal output by the spatiotemporal mode-locked laser and transmits the spectral image and data of the laser to the host computer. The host computer calls the wavelength multiplexing analysis program of the spectrometer to determine whether the spectral information is four-wave mixing and calculates the output state of the four-wave mixing.

[0045] S4. If the output state does not meet the preset target state, the voltage value interval is changed and the initial population is reselected until the four-wave mixing output state meets the preset target state;

[0046] S5. If the four-wave mixing output state meets the preset target state, the automatic mode locking of the multi-mode four-wave mixing is terminated.

[0047] Furthermore, in S2, the host computer judges the time domain signal and then uses the genetic algorithm to implement the automatic mode locking operation, which specifically includes:

[0048] After the host computer obtains the time domain data from the oscilloscope, it performs peak detection and determines the peaks with intensity greater than the specified threshold as pulses, thereby obtaining the number of pulses. The average pulse amplitude and jitter are calculated by the peak amplitude of the pulses. The number of pulses, the average pulse amplitude and the jitter are weighted and scored. The sum obtained is the time domain signal score of the laser output phenomenon at this voltage value. The closer to the mode-locked pulse state, the higher the score. The genetic algorithm will perform inheritance, crossover and mutation operations based on the time domain signal score until the output of the mode-locked pulse is achieved.

[0049] Furthermore, in S2, the genetic algorithm used is a regional genetic algorithm, which divides the voltage value range controlling the electric polarization controller into several intervals, randomly selects one of the intervals to generate an initial population, and performs crossover, mutation and genetic operations of the genetic algorithm until the mode-locked pulse output is achieved.

[0050] Furthermore, in S3, the host computer calls the wavelength multiplexing analysis program of the spectrometer to determine whether the spectrum information is four-wave mixing and calculate the output state of the four-wave mixing, including:

[0051] The host computer calls the wavelength division multiplexing analysis program of the spectrometer to obtain the wavelength and level information of the spectrum peaks that are greater than the specified threshold in the spectrum; the wavelength intervals of adjacent spectrum peaks are calculated, and when three consecutive identical wavelength intervals appear, it is determined to be four-wave mixing. Figure 3 As shown; and the wavelengths of the corresponding spectrum peaks are extracted to form a four-wave mixing wavelength group, and then the number of wavelengths and wavelength intervals of the four-wave mixing are obtained, and the wavelengths in the four-wave mixing wavelength group are averaged to obtain the central wavelength.

[0052] Furthermore, in S4-S5, different operations are performed according to whether the four-wave mixing output state meets the preset target state, including:

[0053] The host computer determines whether it is four-wave mixing by judging the four-wave mixing spectrum, and calculates whether the number of wavelengths, wavelength interval and center wavelength of the four-wave mixing meet the preset target state. If it is not four-wave mixing that meets the target conditions, the patience value is reduced by 1 and the search is restarted; when the patience value is 0, the next voltage value interval is changed for operation; if it meets the preset target state, the automatic locking of the multi-mode four-wave mixing is terminated.

[0054] Specifically, the wavelength count, center wavelength, and wavelength spacing of the four-wave mixing (FWM) are compared to a preset target state. A certain degree of error is allowed in the comparison of the center wavelength and wavelength spacing, and the accuracy of the error can be adjusted. For example, the center wavelength can have an error of 0.5nm, and the wavelength spacing can have an error of 0.1nm. If the output state does not meet the preset target conditions, the regional genetic algorithm will change the voltage value range to search for other different output phenomena of the laser.

[0055] The present invention improves upon the traditional genetic algorithm by dividing the genetic algorithm population into several intervals. Due to the multimode interference filtering effect, individuals within different intervals produce significantly different experimental phenomena, thereby expanding the search range for laser phenomena. The voltage range for controlling the electric polarization controller is divided into several intervals. For example, the voltage range for controlling the electric polarization controller is (0-10V). Since the electric polarization controller has three control components, three voltage values ​​are grouped together: (0-10V, 0-10V, 0-10V). This voltage value group can be divided into eight intervals: (0-5V, 0-5V, 0-5V), (0-5V, 0-5V, 5V-10V), (0-5V, 5V-10V, 5V-10V), ... (5-10V, 5-10V, 5-10V).

[0056] Unlike traditional genetic algorithms, which select an initial population (i.e., voltage value) across the entire range, the regional genetic algorithm selects the initial population within a specific interval. Due to the multimode interference filtering effect, the laser will produce significantly different experimental results when controlled by voltage in different intervals. First, one interval is randomly selected and several voltage value groups (e.g., 10) are randomly generated. These groups are sequentially input into the motorized polarization controller to control the spatiotemporal mode-locking of the laser. The time domain signal of the mode-locked pulse is then identified based on oscilloscope data, and a time domain score is obtained. The genetic algorithm then performs crossover, mutation, and inheritance operations until mode-locked pulse output is achieved. Next, four-wave mixing (FWM) is determined using spectrometer data to determine if it is FWM. The wavelength count, wavelength spacing, and center wavelength of the FWM are calculated to determine whether they meet the preset target state. If not, the patience value is decremented by 1. The patience value represents the number of search attempts within the interval, for example, set to 2. When the patience value reaches 0, the voltage range is changed, the initial population is selected again, and the genetic algorithm continues until the laser output meets the preset target state.

[0057] The present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, a multi-mode four-wave mixing automatic mode locking method as described above is implemented.

[0058] In a specific embodiment, a spatiotemporally mode-locked laser is first connected to a pump source to generate laser output. A host computer randomly selects a voltage range and selects a voltage value to control a motorized polarization controller. Under different voltage inputs, the polarization state of the laser within the laser is regulated, the fiber length is fine-tuned, and the energy coupling between different transverse modes changes. Due to the multimode interference filtering effect, different output phenomena are generated. The laser output is split into two paths, transmitted to an oscilloscope and a spectrometer, respectively. The oscilloscope outputs the laser time-domain signal and transmits it to the host computer. The host computer scores the time-domain signal based on the number of pulses, average pulse amplitude, and jitter. The closer it is to a mode-locked pulse state, the higher the score. The host computer then performs genetic algorithm inheritance, crossover, and mutation operations based on the time-domain signal score until mode-locked pulse output is achieved. The spectrometer then outputs the laser spectrum signal and transmits it to the host computer. The host computer calls the spectrometer's wavelength multiplexing analysis program to identify four-wave mixing (FWM). When three consecutive identical wavelength intervals appear in the spectrum, FWM is identified and the number of wavelengths, wavelength interval, and center wavelength are calculated. If the output state does not meet the preset target state, the patience value is reduced. When the patience value reaches zero, the voltage range is changed to search for other output states of the laser. If the output state meets the preset target state, the automatic mode locking of the multimode FWM is terminated.

[0059] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, or of course, by hardware. Based on this understanding, the essence of the above technical solution or the part that contributes to the existing technology can be embodied in the form of a software product. The computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a magnetic disk, an optical disk, etc., and includes a number of instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or certain parts of the embodiments.

[0060] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A multi-mode four-wave mixing automatic mode locking device, characterized in that: The device comprises a host computer, an electric polarization controller, a spatiotemporal mode-locked laser, an oscilloscope, and a spectrometer; wherein the electric polarization controller is located in the spatiotemporal mode-locked laser; the host computer is connected to the electric polarization controller; the input ends of the oscilloscope and the spectrometer are connected to the spatiotemporal mode-locked laser, and the output ends of the oscilloscope and the spectrometer are connected to the host computer; The host computer is used to output voltage to control the electric polarization controller, obtain data from the oscilloscope and spectrometer, and execute a four-wave mixing automatic mode locking algorithm; The electric polarization controller is used to receive a voltage signal from a host computer, adjust the polarization state and fiber length of the spatiotemporal mode-locked laser, and change the energy coupling of different transverse modes in the spatiotemporal mode-locked laser; The spatiotemporal mode-locked laser is used to output mode-locked pulses of different phenomena under the control of the electric polarization controller, and the output laser is divided into two paths through an optical coupler and transmitted to an oscilloscope and a spectrometer respectively; The oscilloscope is used to receive the time domain signal from the spatiotemporal mode-locked laser and output the time domain image and data of the laser; The spectrometer is used to receive the spectrum signal from the spatiotemporal mode-locked laser and output the spectrum image and data of the laser.

2. A multi-mode four-wave mixing automatic mode locking method, applied to the multi-mode four-wave mixing automatic mode locking device according to claim 1, characterized in that: The following steps are involved: S1. The host computer randomly selects a voltage value interval and selects an initial voltage value to control the electric polarization controller to adjust the output state of the spatiotemporal mode-locked laser; S2. An oscilloscope receives the laser signal output by the spatiotemporal mode-locked laser and transmits the laser's time-domain image and data to the host computer. The host computer identifies the time-domain signal and then implements automatic mode-locking operation through a genetic algorithm. S3, a spectrometer receives the laser signal output by the spatiotemporal mode-locked laser, and transmits the spectral image and data of the laser to a host computer, which calls a wavelength multiplexing analysis program of the spectrometer to determine whether the spectral information is four-wave mixing and calculates the output state of the four-wave mixing; S4. If the output state does not meet the preset target state, the voltage value interval is changed and the initial population is reselected until the four-wave mixing output state meets the preset target state; S5. If the four-wave mixing output state meets the preset target state, the automatic mode locking of the multi-mode four-wave mixing is terminated.

3. A multi-mode four-wave mixing automatic mode locking method according to claim 2, characterized in that: In S2, the host computer discriminates the time domain signal and then implements automatic mode locking operation through a genetic algorithm, specifically including: After the host computer obtains the time domain data from the oscilloscope, it performs peak detection and determines the peaks with intensity greater than the specified threshold as pulses, thereby obtaining the number of pulses. The average pulse amplitude and jitter are calculated by the peak amplitude of the pulses. The number of pulses, the average pulse amplitude and the jitter are weighted and scored. The sum obtained is the time domain signal score of the laser output phenomenon at this voltage value. The closer to the mode-locked pulse state, the higher the score. The genetic algorithm will perform inheritance, crossover and mutation operations based on the time domain signal score until the output of the mode-locked pulse is achieved.

4. A multi-mode four-wave mixing automatic mode locking method according to claim 3, characterized in that: The genetic algorithm used in S2 is a regional genetic algorithm, which divides the voltage value range of the electric polarization controller into several intervals, randomly selects one of the intervals to generate an initial population, and performs crossover, mutation and genetic operations of the genetic algorithm until the mode-locked pulse output is achieved.

5. The multi-mode four-wave mixing automatic mode locking method according to claim 2, characterized in that: In S3, the host computer calls the wavelength multiplexing analysis program of the spectrometer to determine whether the spectrum information is four-wave mixing and calculate the output state of the four-wave mixing, which specifically includes: The host computer calls the wavelength division multiplexing analysis program of the spectrometer to obtain the wavelength and level information of the spectrum peaks greater than a specified threshold in the spectrum; calculates the wavelength intervals of adjacent spectrum peaks, and when three consecutive identical wavelength intervals appear, it is determined to be four-wave mixing; and extracts the wavelengths of the corresponding spectrum peaks to form a four-wave mixing wavelength group, thereby obtaining the number of wavelengths and wavelength intervals of the four-wave mixing, and averages the wavelengths in the four-wave mixing wavelength group to obtain the central wavelength.

6. The multi-mode four-wave mixing automatic mode locking method according to claim 2, characterized in that: In S4-S5, different operations are performed according to whether the four-wave mixing output state meets the preset target state, specifically including: The host computer determines whether it is four-wave mixing by judging the four-wave mixing spectrum, and calculates whether the number of wavelengths, wavelength interval and center wavelength of the four-wave mixing meet the preset target state. If it is not four-wave mixing that meets the target conditions, the patience value is reduced by 1 and the search is restarted; when the patience value is 0, the next voltage value interval is changed for operation; if it meets the preset target state, the automatic locking of the multi-mode four-wave mixing is terminated.

7. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the multi-mode four-wave mixing automatic mode locking method according to any one of claims 2 to 6 is implemented.

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