Soliton detuning amount locking system and method assisted by laser feedback

Abstract

The application provides a soliton detuning quantity locking system assisted by laser feedback, comprising: a pump laser generating unit, the pump laser generating unit generates continuous tuning pump laser; an auxiliary laser generating unit, the auxiliary laser generating unit generates auxiliary laser; a micro-nano resonant cavity, the continuous tuning pump laser is forwardly coupled to the micro-nano resonant cavity to generate a soliton; the auxiliary laser is reversely coupled to the micro-nano resonant cavity to control thermal effect and affect the resonant peak position of the micro-nano resonant cavity; an auxiliary laser feedback unit, the auxiliary laser feedback unit processes the output of the micro-nano resonant cavity, obtains a feedback signal and feeds it back to the auxiliary laser generating unit, changes the frequency of the auxiliary laser, changes the resonant peak position of the micro-nano resonant cavity, locks the soliton detuning quantity and realizes soliton locking. The feedback control loop of the application does not change the frequency of the pump laser, reduces the influence on the soliton comb frequency, and makes the soliton comb tooth frequency, the repetition frequency and the bias frequency and other parameters have better stability.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of optical frequency comb, in particular to a soliton detuning amount locking system and method assisted by laser feedback. BACKGROUND

[0002] An optical frequency comb is a kind of electromagnetic wave composed of spectral lines with equal frequency intervals. The dissipative Kerr soliton optical frequency comb generated based on the nonlinear parametric process of a micro / nano resonator has the characteristics of high coherence, high repetition frequency and low noise, and is widely used in the fields of optical communication, ultrafast ranging, frequency-modulated continuous-wave laser radar, low-phase-noise microwave generation, optical frequency synthesis, dual-comb spectroscopy and quantum key distribution.

[0003] The generation of Kerr solitons in a microcavity is an optical parametric process in which nonlinearity and dispersion, loss and pumping reach balance at the same time. Due to the influence of thermal effects, the refractive index, resonant frequency and other states in the microcavity change rapidly, making it difficult to achieve the generation of Kerr solitons. At present, various schemes for stably achieving single soliton states have been proposed, including fast scanning of pump laser, reverse tuning, pulse driving, auxiliary pump thermal effect control, fast scanning of heater, etc. After the generation of Kerr solitons in the microcavity, the jitter of pump laser frequency, output power and external environmental changes will interfere with the stability of the solitons, causing the solitons to disappear. To lock the soliton state and keep the solitons stable for a long time, the commonly used methods include soliton power locking and Pound-Drever-Hall (PDH) locking.

[0004] In the previous soliton PDH locking technology, the soliton detuning amount is locked by feedback to the pump laser frequency. However, the pump laser frequency is related to the generated soliton frequency comb frequency, and in the feedback system working process, the pump laser frequency is changed to achieve locking, which correspondingly affects the soliton frequency comb frequency, reducing the stability of each comb tooth frequency of the soliton. Moreover, this technology requires the pump laser to pass through two different modulators in turn. On the one hand, the modulators have large attenuation, and the pump laser attenuates after passing through the two modulators, which makes it difficult to meet the power threshold of the microcavity or the input power threshold of the optical amplifier, and the output power of the laser needs to be greatly improved. On the other hand, various types of modulators inevitably generate a large amount of sidebands, introducing noise, and the sidebands and noise of the two modulators are superimposed, reducing the performance of the pump laser and having a great influence on the generation of solitons by the pump laser. SUMMARY

[0005] In view of the defects in the prior art, the purpose of the present application is to provide a soliton detuning amount locking system and method assisted by laser feedback.

[0006] According to one aspect of the present application, a soliton detuning amount locking system assisted by laser feedback is provided, comprising:

[0007] a pump laser generation unit, which generates a continuously tunable pump laser;

[0008] an auxiliary laser generation unit, which generates an auxiliary laser;

[0009] a micro-nano resonator, the continuously tunable pump laser is forward coupled to the micro-nano resonator to generate a soliton, and the auxiliary laser is backward coupled to the micro-nano resonator to control thermal effects and affect the resonant peak position of the micro-nano resonator;

[0010] an auxiliary laser feedback unit, which processes the output of the micro-nano resonator to obtain a feedback signal and feed it back to the auxiliary laser generation unit to change the frequency of the auxiliary laser, change the resonant peak position of the micro-nano resonator, lock the soliton detuning amount, and realize soliton locking.

[0011] Preferably, the pump laser generation unit comprises:

[0012] a first laser, which is used to generate a pump laser;

[0013] a first voltage-controlled oscillator, which provides a modulation frequency;

[0014] a first modulator, which phase-modulates the pump laser according to the modulation frequency;

[0015] a first optical amplifier, which is used to amplify the power of the pump laser;

[0016] a first fiber polarization controller, which is used to change the polarization state of the pump laser;

[0017] a first circulator, which is used to separate input light and output light.

[0018] Preferably, the auxiliary laser generation unit comprises:

[0019] a second laser, which is used to generate an auxiliary laser;

[0020] a second voltage-controlled oscillator, which provides a modulation frequency;

[0021] a second modulator, which phase-modulates the auxiliary laser according to the modulation frequency;

[0022] a second optical amplifier, which is used to amplify the power of the auxiliary laser;

[0023] a second fiber polarization controller, which is used to change the polarization state of the auxiliary laser;

[0024] a second circulator for separating the input light and the output light.

[0025] Preferably, the auxiliary laser feedback unit comprises:

[0026] a light detector connected with the second circulator, for detecting the light power output by the micro-nano resonant cavity and converting it into an electrical signal;

[0027] a frequency mixer connected with the light detector, for mixing the electrical signal with the output of the first voltage-controlled oscillator;

[0028] a low-pass filter connected with the frequency mixer, for filtering high-frequency signals and generating an error signal;

[0029] a PID controller connected with the low-pass filter and the second voltage-controlled oscillator, for generating a feedback signal according to the error signal, and inputting the feedback signal into the second voltage-controlled oscillator after superimposing it with an initial bias signal set by the auxiliary laser generation unit, and feeding it back to the second modulator.

[0030] Preferably, the second modulator is a dual-parallel Mach-Zehnder modulator, and the intensity of each sideband of the auxiliary laser is changed by changing the modulation voltage.

[0031] Preferably, the system further comprises a phase shifter for changing the phase of the output signal of the first voltage-controlled oscillator, so that the input signals at both ends of the frequency mixer are orthogonal, and the phase shifter is a lengthened coaxial line.

[0032] According to a second aspect of the present application, a soliton detuning quantity locking method with auxiliary laser feedback is provided, which uses any one of the soliton detuning quantity locking systems with auxiliary laser feedback, and comprises the following steps:

[0033] setting the optical frequencies of the first laser and the second laser, setting the output powers of the first optical amplifier and the second optical amplifier, and adjusting the polarization states of the pump laser and the auxiliary laser;

[0034] setting the output frequency of the second voltage-controlled oscillator, and modulating the auxiliary laser by the second modulator according to the output frequency, so that the modulated auxiliary laser enters the blue detuning region of the resonance peak of the micro-nano resonant cavity;

[0035] continuously tuning the pump laser to enter the red detuning region of the resonance peak of the micro-nano resonant cavity, so as to generate a soliton;

[0036] setting the output frequency of the first voltage-controlled oscillator according to the detuning quantity of the pump laser, so that the first-order sideband generated by phase modulation of the pump laser by the first modulator is located at the center of the resonance peak;

[0037] The PID controller is started, a feedback signal is generated, the frequency of the modulated auxiliary laser is controlled by feedback, and the soliton is locked.

[0038] Preferably, the method comprises:

[0039] A network analyzer is used to connect the first modulator and the optical detector, to perform frequency scanning, and to measure the frequency-dependent transmission curve between the first modulator port and the optical detector port.

[0040] The frequency corresponding to the soliton wave peak in the transmission curve, i.e., the pump laser detuning, is measured, and the output frequency of the first voltage-controlled oscillator is set accordingly.

[0041] According to a third aspect of the present application, a terminal is provided, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor, when executing the program, is configured to perform any of the methods, or to run any of the systems.

[0042] According to a fourth aspect of the present application, a computer-readable storage medium is provided, which stores a computer program executable by a processor to perform any of the methods, or to run any of the systems.

[0043] Compared with the prior art, the present application has the following advantages:

[0044] The soliton detuning locking system and method of the auxiliary laser feedback in the embodiment of the present application lock the soliton detuning (i.e., the frequency difference between the pump laser and the resonance peak) by changing the microcavity resonance peak position through feedback to the auxiliary laser frequency, to realize soliton locking, without changing the pump laser frequency in the feedback control loop, thereby reducing the influence on the soliton frequency comb frequency, and making the soliton comb tooth frequency, the repetition frequency, and the bias frequency have better stability.

[0045] The soliton detuning locking system and method of the auxiliary laser feedback in the embodiment of the present application use a scheme in which two lasers are modulated by one modulator, thereby reducing the number of modulators through which the pump laser needs to pass, reducing the sideband power and noise of the modulated pump laser, improving the noise performance of the pump laser, reducing the influence of sideband and noise interference on the generation and stability of the microcavity soliton, and improving the stability of the microcavity soliton.

[0046] The soliton detuning locking system and method of the auxiliary laser feedback in the embodiment of the present application reduce the number of modulators through which the pump laser needs to pass, reduce the attenuation of the pump laser, and reduce the requirements for the input power threshold of the optical amplifier, the output power of the laser, or the power threshold of the microcavity.

[0047] The soliton detuning amount locking system and method with auxiliary laser feedback in the embodiment of the present application can change the auxiliary laser power in the input microcavity by adjusting the second modulator modulation voltage, and can provide an auxiliary laser power high-speed control port by using a gain-fixed optical amplifier or exchanging the positions of the second modulator and the second optical amplifier, and is compatible with the feedback locking system and method of the feedback to the auxiliary laser power.

[0048] The soliton detuning amount locking system and method with auxiliary laser feedback in the embodiment of the present application can share the pump laser from the same laser for two solitons due to the feedback to the auxiliary laser in the application requiring double soliton frequency locking, and can reduce the frequency locking loop required by one system and reduce the complexity of the system locking module compared with using two incoherent pump lasers. BRIEF DESCRIPTION OF DRAWINGS

[0049] Other features, objects and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments with reference to the attached drawings:

[0050] Figure 1 FIG. 1 is a structural schematic diagram of a soliton detuning amount locking system with auxiliary laser feedback in an embodiment of the present application;

[0051] In the figure, 1 is a first laser, 2 is a first modulator, 3 is a first voltage-controlled oscillator, 4 is a first optical amplifier, 5 is a first fiber polarization controller, 6 is a first circulator, 7 is a second laser, 8 is a second modulator, 9 is a second voltage-controlled oscillator, 10 is a second optical amplifier, 11 is a second fiber polarization controller, 12 is a second circulator, 13 is a micro-nano resonant cavity, 14 is an optical detector, 15 is a phase shifter, 16 is a frequency mixer, 17 is a low-pass filter, and 18 is a PID controller.

[0052] Figure 2 FIG. 2 is a flowchart of a soliton detuning amount locking method with auxiliary laser feedback in an embodiment of the present application. DETAILED DESCRIPTION

[0053] The present application will be described in detail below with reference to specific embodiments. The following embodiments will help those skilled in the art to further understand the present application, but do not limit the present application in any form. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present application. These all belong to the protection scope of the present application.

[0054] The present application provides an embodiment of a soliton detuning amount locking system with auxiliary laser feedback, as shown in FIG. 1. Figure 1As shown, it comprises: a pump laser generating unit, an auxiliary laser generating unit, a micro-nano resonant cavity and an auxiliary laser feedback unit; the pump laser generating unit generates continuous tuning pump laser; the auxiliary laser generating unit generates auxiliary laser; the continuous tuning pump laser is forwardly coupled to the micro-nano resonant cavity; the auxiliary laser is reversely coupled to the micro-nano resonant cavity; the auxiliary laser feedback unit processes the output of the micro-nano resonant cavity, obtains a feedback signal and feeds it back to the auxiliary laser generating unit, changes the auxiliary laser frequency, changes the micro-cavity resonant peak position, locks the soliton detuning amount and realizes soliton locking.

[0055] The soliton detuning amount locking system and method of the auxiliary laser feedback in the embodiment can lock the soliton by feeding back to the auxiliary laser frequency, changing the micro-cavity resonant peak position, locking the soliton detuning amount and realizing soliton locking.

[0056] In a preferred embodiment of the present application, the pump laser generating unit comprises: a first laser 1, a first modulator 2, a first voltage-controlled oscillator 3, a first optical amplifier 4, a first optical fiber polarization controller 5 and a first circulator 6; the first laser 1 is used to generate pump laser; after sequentially passing through the first modulator 2, the first optical amplifier 4, the first optical fiber polarization controller 5 and the first circulator 6, the pump laser is forwardly coupled to the micro-nano resonant cavity 13.

[0057] The first laser 1 is used to generate pump laser; the first modulator 2 is used to phase modulate the pump laser, and the modulation frequency is the output frequency of the first voltage-controlled oscillator 3; the first voltage-controlled oscillator 3 provides the modulation frequency; the first optical amplifier 4 is used to amplify the pump laser power; the first optical fiber polarization controller 5 is used to change the polarization state of the pump laser; and the first circulator 6 is used to separate the input light and the output light.

[0058] In a preferred embodiment of the present application, the auxiliary laser generating unit comprises: a second laser 7, a second modulator 8, a second voltage-controlled oscillator 9, a second optical amplifier 10, a second optical fiber polarization controller 11 and a second circulator 12; the second laser 7 is used to generate auxiliary laser; after sequentially passing through the second modulator 8, the second optical amplifier 10, the second optical fiber polarization controller 11 and the second circulator 12, the auxiliary laser is reversely coupled to the micro-nano resonant cavity 13.

[0059] The second laser 7 is used to generate auxiliary laser; the second modulator 8 is used to modulate the auxiliary laser, and the modulation frequency is the output frequency of the second voltage-controlled oscillator; the second voltage-controlled oscillator 9 provides the modulation frequency; the second optical amplifier 10 is used to amplify the auxiliary laser power; the second optical fiber polarization controller 11 is used to change the polarization state of the auxiliary laser; and the second circulator 12 is used to separate the input light and the output light.

[0060] In the above embodiments, by adjusting the modulation voltage of the second modulator, the auxiliary laser power in the input microcavity can be changed. By using a fixed-gain optical amplifier or swapping the positions of the second modulator and the second optical amplifier, a high-speed control port for the auxiliary laser power can be provided, which is compatible with feedback locking systems and methods that feed back to the auxiliary laser power.

[0061] In the two embodiments described above, a scheme in which two lasers are modulated by a single modulator is adopted. This reduces the number of modulators that the pump laser needs to pass through, reduces the sideband power and noise of the pump laser after modulation, improves the noise performance of the pump laser, reduces the impact of sideband and noise interference on the generation and stability of microcavity solitons, and improves the stability of microcavity solitons.

[0062] In the two embodiments described above, the number of modulators that the pump laser needs to pass through is reduced, the attenuation of the pump laser is reduced, and the requirements for the input power threshold of the optical amplifier, the output power of the laser, or the power threshold of the microcavity are lowered.

[0063] In a preferred embodiment of the present invention, the auxiliary laser feedback unit includes: a photodetector 14, a mixer 16, a low-pass filter 17, and a PID controller 18;

[0064] The photodetector 14 is connected to the second circulator and is used to detect the optical power output by the micro-nano resonant cavity 13 in the forward direction. It is converted into an electrical signal and then passes through the mixer 16 and the low-pass filter 17 in sequence to generate an error signal.

[0065] Mixer 16 is connected to photodetector 14 and mixes the electrical signal with the output of the first voltage-controlled oscillator.

[0066] The low-pass filter 17 is connected to the mixer 16 to filter high-frequency signals and generate error signals.

[0067] The PID controller 18 is connected to the low-pass filter 17 and the second voltage-controlled oscillator 9. It generates a feedback signal based on the error signal. The feedback signal is superimposed with the initial bias signal set by the auxiliary laser generating unit and then input to the second voltage-controlled oscillator, which feeds back to the second modulator 8.

[0068] The second modulator 8, the second voltage-controlled oscillator 9, the photodetector 14, the mixer 16, the low-pass filter 17, and the PID controller 18 are combined to form a feedback control loop, which changes the auxiliary laser frequency, changes the position of the resonant peak of the micro-nano resonant cavity, locks the soliton detuning, and achieves soliton locking.

[0069] In this embodiment, the feedback control loop does not change the pump laser frequency, reducing the impact on the soliton frequency comb frequency and making the parameters such as the frequency of each soliton comb tooth, repetition frequency and bias frequency more stable.

[0070] In a preferred embodiment, the second modulator 8 is a dual parallel Mach-Zehnder modulator, and the intensity of each sideband of the auxiliary laser is changed by changing the modulation voltage. Further, the modulation voltage of the dual parallel Mach-Zehnder modulator is set so that the auxiliary laser realizes carrier-suppressed single sideband modulation.

[0071] In a preferred embodiment, the phase shifter 15 is a section of extended coaxial line, and the phase shifter 15 changes the phase of the output signal of the first voltage-controlled oscillator 3 so that the input signals at both ends of the mixer 16 are orthogonal.

[0072] In a preferred embodiment, after the feedback signal is superimposed with the initial bias signal, the superimposed signal is input to the second voltage-controlled oscillator 9, and the feedback is fed back to the second modulator 8. By setting the initial bias signal, the initial frequency of the auxiliary laser is changed, and the superimposed signal is completely located in the input interval of the second voltage-controlled oscillator 9.

[0073] Based on the same inventive concept, a soliton detuning quantity locking method of an auxiliary laser feedback is provided, and see Figure 2 , which comprises:

[0074] S100, setting the optical frequencies of the first laser and the second laser, setting the output powers of the first optical amplifier and the second optical amplifier, and adjusting the polarization states of the pump laser and the auxiliary laser;

[0075] S200, setting the output frequency of the second voltage-controlled oscillator, modulating the auxiliary laser through the second modulator, and making the modulated auxiliary laser enter the blue detuning region of the resonance peak of the micro-nano resonant cavity to balance the thermal effect;

[0076] S300, continuously tuning the pump laser to enter the red detuning region of the resonance peak of the micro-nano resonant cavity to generate a soliton;

[0077] S400, setting the output frequency of the first voltage-controlled oscillator according to the detuning quantity of the pump laser, so that a first-order sideband generated by phase modulation of the pump laser through the first modulator is located at the center of the resonance peak;

[0078] S500, starting the PID controller to generate a feedback signal, and feeding back to control the frequency of the modulated auxiliary laser to realize soliton locking.

[0079] In S200 of this embodiment, as a preferred embodiment, the step of modulating the auxiliary laser through the second modulator can include the following steps:

[0080] Setting the modulation voltage of the second modulator to realize carrier-suppressed single sideband modulation of the auxiliary laser.

[0081] In this embodiment, carrier-suppressed single sideband modulation is realized, so that the sideband power of the auxiliary laser entering the blue detuning region of the resonance peak of the micro-nano resonant cavity is the highest, and the power loss is reduced.

[0082] In S300 of this embodiment, as a preferred embodiment, the following steps can be included:

[0083] In S300 of this embodiment, as a preferred embodiment, the following steps can be included:

[0084] In this embodiment, the loaded frequency tuning waveform can be reused, the operation is simple, the repetitive labor is reduced, and more time can be saved compared with manual tuning.

[0085] In S400 of this embodiment, as a preferred embodiment, the first voltage-controlled oscillator output frequency is set according to the pump laser detuning amount, and the following steps can be included:

[0086] The network analyzer is used to connect the first modulator and the optical detector, perform frequency scanning, and measure the frequency-dependent transmission curve between the first modulator port and the optical detector port; the frequency corresponding to the soliton wave peak in the transmission curve, i.e. the pump laser detuning amount, is measured to set the first voltage-controlled oscillator output frequency.

[0087] In this embodiment, the network analyzer can accurately measure the pump laser detuning amount.

[0088] Based on the same inventive concept, other embodiments of the present application also provide a terminal, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor can be used to execute any of the methods or run any of the systems when executing the program.

[0089] Based on the same inventive concept, other embodiments of the present application also provide a computer readable storage medium, which stores a computer program, and the program is executable on a processor to execute any of the methods or run any of the systems.

[0090] The specific embodiments of the present application are described above. It should be understood that the present application is not limited to the above specific embodiments, and various modifications or variations can be made by those skilled in the art within the scope of the claims, which does not affect the essential content of the present application. The above preferred features can be combined for use in the case of not conflicting with each other.

Claims

1. A soliton detuning quantity locking system assisted by laser feedback, characterized in that, The application relates to a pump laser generation unit, an auxiliary laser generation unit, a micro-nano resonant cavity, an auxiliary laser feedback unit, and a pump laser generation unit. The pump laser generation unit comprises a first laser for generating pump laser, a first voltage-controlled oscillator for providing a modulation frequency, a first modulator for phase-modulating the pump laser according to the modulation frequency, a first optical amplifier for amplifying the pump laser power, a first fiber polarization controller for changing the pump laser polarization state, and a first circulator for separating input light and output light. The auxiliary laser generation unit comprises a second laser for generating auxiliary laser, a second voltage-controlled oscillator for providing a modulation frequency, a second modulator for phase-modulating the auxiliary laser according to the modulation frequency, a second optical amplifier for amplifying the auxiliary laser power, a second fiber polarization controller for changing the auxiliary laser polarization state, and a second circulator for separating input light and output light. The auxiliary laser feedback unit comprises an optical detector connected with the second circulator for detecting the light power output by the micro-nano resonant cavity and converting the light power into an electric signal, a frequency mixer connected with the optical detector for mixing the electric signal with the output of the first voltage-controlled oscillator, a low-pass filter connected with the frequency mixer for filtering high-frequency signals and generating an error signal, and a PID controller connected with the low-pass filter and the second voltage-controlled oscillator for generating a feedback signal according to the error signal, wherein the feedback signal is superimposed with an initial bias signal set by the auxiliary laser generation unit and then input into the second voltage-controlled oscillator and fed back to the second modulator. The output frequency of the first voltage-controlled oscillator is set according to the pump laser detuning amount, so that a first-order sideband generated by phase-modulating the pump laser through the first modulator is located at the center of the resonant peak. The modulation voltage of the second modulator is set to realize carrier-suppressed single-sideband modulation of the auxiliary laser. A frequency tuning waveform is loaded on the first laser, and the frequency tuning waveform shape is adjusted so that the pump laser is continuously tuned from high frequency to low frequency, enters the red detuning region of the micro-nano resonant cavity, and stops after generating a soliton. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2. A soliton detuning-locked system assisted by laser feedback according to claim 1, characterized in that, The second modulator is a double parallel Mach-Zehnder modulator, and the sideband intensity of the auxiliary laser is changed by changing the modulation voltage.

3. A soliton detuning-locked system assisted by laser feedback according to claim 1, characterized in that, The phase shifter is also included, which changes the phase of the first voltage-controlled oscillator output signal to make the input signals of the mixer orthogonal, and the phase shifter is a lengthened coaxial line.

4. A method of soliton detuning-quantum locking with auxiliary laser feedback, using a soliton detuning-quantum locking system with auxiliary laser feedback according to any one of claims 1-3, characterized in that, The system comprises: The optical frequencies of the first laser and the second laser are set, the output powers of the first optical amplifier and the second optical amplifier are set, and the polarization states of the pump laser and the auxiliary laser are adjusted; The output frequency of the second voltage-controlled oscillator is set, and the second modulator modulates the auxiliary laser according to the output frequency, so that the modulated auxiliary laser enters the blue detuning region of the resonance peak of the micro-nano resonant cavity; The pump laser is continuously tuned to enter the red detuning region of the resonance peak of the micro-nano resonant cavity to generate a soliton; The output frequency of the first voltage-controlled oscillator is set according to the detuning amount of the pump laser, so that the first-order sideband generated by phase modulation of the pump laser through the first modulator is located at the center of the resonance peak; The PID controller is turned on to generate a feedback signal, and the frequency of the modulated auxiliary laser is controlled by feedback to realize soliton locking.

5. A method of soliton detuning-quantum locking with auxiliary laser feedback according to claim 4, characterized in that, The output frequency of the first voltage-controlled oscillator is set according to the detuning amount of the pump laser, so that the first-order sideband generated by phase modulation of the pump laser through the first modulator is located at the center of the resonance peak; The network analyzer is used to connect the first modulator and the optical detector, and the frequency scanning is performed to measure the frequency-dependent transmission curve between the first modulator port and the optical detector port; The frequency corresponding to the soliton wave peak in the transmission curve, i.e. the detuning amount of the pump laser, is measured to set the output frequency of the first voltage-controlled oscillator.

6. A terminal comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, The processor executes the program to execute the auxiliary laser feedback soliton detuning amount locking system of any one of claims 1-3, or run the auxiliary laser feedback soliton detuning amount locking method of any one of claims 4-5.

7. A computer-readable storage medium having stored thereon a computer program, characterized in that The program is executed by the processor to execute the auxiliary laser feedback soliton detuning amount locking system of any one of claims 1-3, or run the auxiliary laser feedback soliton detuning amount locking method of any one of claims 4-5.

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