Optical frequency comb stabilized optical fiber link delay jitter system

Abstract

An optical frequency comb stabilization optical fiber link delay jitter system belongs to the technical field of optical frequency combs, and comprises an optical frequency comb used for providing comb-shaped optical signals and transmitting the comb-shaped optical signals to an interference unit; the interference unit is used for carrying out interference on the comb-shaped optical signals from the optical frequency comb; the back-and-forth correction unit is used for performing reverse isolation and frequency modulation on the interfered optical signal, and transmitting the optical signal to the double-light secondary mixing unit after light splitting; and the dual-light secondary mixing unit is used for acquiring a zero-frequency voltage signal through photoelectric conversion, processing the zero-frequency voltage signal through a proportional integral controller, and then taking the zero-frequency voltage signal as an input voltage signal of a tunable delay line for controlling delay jitter of an optical fiber link. According to the method, the precision and the real-time performance of optical fiber link delay jitter control are remarkably improved, and the stability and the reliability of optical fiber link signal transmission are powerfully guaranteed.

Description

Technical Field

[0001] The present invention belongs to the technical field of optical frequency combs, and in particular relates to an optical frequency comb system for stabilizing optical fiber link delay jitter. Background Art

[0002] In fiber-optic communication systems, the delay jitter of optical fiber links has a significant impact on the stability and accuracy of signal transmission. Effectively controlling delay jitter is particularly important in key application scenarios such as high-precision measurement and optical communication network synchronization.

[0003] However, existing technologies for monitoring and compensating for optical fiber link delay jitter have obvious flaws: traditional delay detection methods have difficulty accurately capturing subtle changes in optical frequency domain signals, resulting in insufficient perception accuracy of delay jitter and an inability to effectively compensate in real time, which in turn affects the overall performance of the system.

[0004] In 2022, Zhang Xiang and others from the Chinese Academy of Sciences proposed a method for stable frequency transmission of coherent optical frequency direct transmission fiber optic links, which requires reliance on expensive ultra-stable lasers and is costly; Zhang Fan and others from the Quantum Information and Measurement Laboratory of Peking University used the phase difference between the local end signal and the remote return signal of the femtosecond mode-locked laser to try to make loop delay jitter. After calculating the phase difference by computer, the digital signal was controlled to drive the optical fiber delay line to compensate for the loop delay jitter. The controllable test bench simulated the external environment to control the delay changes of the optical fiber. There are problems with the high-order harmonic power of the mode-locked laser being small and the loss being large during long-distance transmission, and the algorithm for calculating the phase compensation amount needs to be further improved.

[0005] For example, the invention patent with publication number CN119209191A and invention name "Optical Frequency Comb Frequency Stabilization Device and Method" discloses: a first optical filter is configured to filter the optical frequency comb to obtain two comb teeth to be locked; an oscillation loop is configured to oscillate based on the two comb teeth to be locked to generate an oscillating radio frequency signal of a first angular frequency and an oscillating radio frequency signal of a second angular frequency; a feedback controller is configured to mix the oscillating radio frequency signal of the first angular frequency, the oscillating radio frequency signal of the second angular frequency, and the radio frequency reference signal to extract an error signal that varies with time, and output a control signal based on the error signal to frequency lock the optical frequency comb. This solution focuses on the frequency stabilization control of the optical frequency comb, and its core is to achieve comb tooth frequency locking through dual oscillation loops and mixing feedback. Its technical solution only focuses on the frequency stabilization of the optical frequency comb itself, and does not involve the delay jitter monitoring and compensation of the optical fiber link.

[0006] For example, patent publication number CN115021849B, entitled "Fiber-optic Time Synchronization Device and Method Based on Optoelectronic Time Compensation," discloses a fiber-optic time synchronization solution based on optoelectronic time compensation. Its core approach is to use an optical frequency comb to generate high-frequency light-carrying microwave signals, achieving time synchronization through dual compensation in both the electrical and optical domains. While this achieves high-precision measurement of fiber delay and employs a time compensation mechanism combining electrical and optical domains, significantly improving the compensation accuracy and range of time synchronization while also offering the advantage of rapid response, it suffers from issues such as insufficient optoelectronic compensation synergy, a lack of multi-wavelength dispersion compensation, reliance on high-frequency signals for monitoring accuracy, and limited system architecture flexibility.

[0007] Therefore, it is crucial to use multi-wavelength light sources to accurately sense the dispersion and delay changes of optical fiber links, and to achieve wide-spectrum, high-precision, and fast-response delay jitter compensation through an efficient feedback mechanism. Summary of the Invention

[0008] In view of this, the main purpose of the present invention is to provide an optical frequency comb system for stabilizing optical fiber link delay jitter, in order to at least partially solve the above technical problems.

[0009] To achieve the above objectives, as a first aspect of the present invention, a system for stabilizing optical fiber link delay jitter using an optical frequency comb is proposed, comprising: An optical frequency comb, used to provide a comb-shaped optical signal and transmit it to an interference unit; an interference unit, configured to interfere with the comb-shaped optical signal from the optical frequency comb; A round-trip correction unit, used to perform reverse isolation and frequency modulation on the interfered optical signal, and transmit it to the dual-optical secondary mixing unit after light splitting; and The dual-optical secondary mixing unit is used to obtain a zero-frequency voltage signal through photoelectric conversion, and the zero-frequency voltage signal is processed by a proportional-integral controller as the input voltage signal of the tunable delay line to control the delay jitter of the optical fiber link.

[0010] Based on the above technical solutions, the optical frequency comb system for stabilizing optical fiber link delay jitter of the present invention has at least one of the following beneficial effects compared to the prior art: 1. The dual-optical secondary mixing unit consists of two delayed self-heterodyne interferometers. It uses optical frequency domain signals to more accurately sense fiber link delay jitter. Through optoelectronic conversion, two RF signals carrying fiber link delay jitter are used to generate a zero-frequency voltage signal through a mixer. This solves the technical problem of traditional delay detection, which struggles to accurately capture subtle changes in optical frequency domain signals. This zero-frequency voltage signal serves as the input voltage signal for the coordinated optical delay line, controlling fiber link delay jitter. 2. Compared with existing technologies, which suffer from insufficient optoelectronic compensation synergy, lack of multi-wavelength dispersion compensation, reliance on high-frequency signals for monitoring accuracy, and limited system architecture flexibility, the present invention uses an optical filter to select different-order comb teeth of an optical frequency comb. By adjusting the filter parameters of the optical filter, different frequency components for sensing fiber link delay jitter are obtained. This allows for more flexible frequency component selection and a wider range of frequency components. 3. The optical path architecture design includes an integrated wavelength division multiplexer, polarization beam splitter, Faraday rotator, acousto-optic frequency shifter, and tunable optical delay line. In combination with a dual-optical secondary mixing unit, the optical frequency comb is used as a high-precision reference source. Through photoelectric conversion and mixing processing, the delay jitter information is accurately extracted and the tunable optical delay line is driven in real time for compensation. Compared with the existing technology, which has insufficient delay jitter perception accuracy and cannot be compensated in real time and effectively, the present invention significantly improves the accuracy and real-time performance of optical fiber link delay jitter control, effectively ensuring the stability and reliability of optical fiber link signal transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the 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.

[0012] Figure 1 It is a structural diagram of the optical frequency comb stabilizing optical fiber link delay jitter system of the present invention. DETAILED DESCRIPTION

[0013] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0014] The terms used in the present invention are only for the purpose of describing specific embodiments and are not intended to limit the embodiments of the present invention. The singular forms "a", "an", "the" and "the" used in the embodiments of the present invention and the appended claims are also intended to include plural forms unless the context clearly indicates otherwise.

[0015] The inventors found that the existing technology has the problem that the high-order harmonic power of the mode-locked laser is small and the loss is large during long-distance transmission, and the algorithm for calculating the phase compensation amount needs to be further improved. After in-depth research, it was found that the optical fiber link delay jitter is more accurately sensed by the optical frequency domain signal through the dual-light secondary mixing unit including two delayed self-heterodyne interference units. Through photoelectric conversion, two radio frequency signals carrying the optical fiber link delay jitter are used to obtain a zero-frequency voltage signal through the mixer. After being processed by the proportional-integral controller, the zero-frequency voltage signal is used as the input voltage signal of the coordinated optical delay line, which can play a role in controlling the optical fiber link delay jitter. Therefore, Figure 1 As shown, the inventors have proposed an optical frequency comb stabilization system for optical fiber link delay jitter, comprising: An optical frequency comb, configured to provide a comb-shaped optical signal and transmit it to an interference unit; and an interference unit, configured to interfere with the comb-shaped optical signal from the optical frequency comb; A round-trip correction unit, used to perform reverse isolation and frequency modulation on the optical signal, and transmit it to the dual-optical secondary mixing unit after light splitting; and The dual-optical secondary mixing unit is used to obtain a zero-frequency voltage signal through photoelectric conversion, and the zero-frequency voltage signal is processed by a proportional-integral controller as the input voltage signal of the tunable delay line to control the delay jitter of the optical fiber link.

[0016] The present invention will be further described below through specific examples. It should be noted that the following examples are merely illustrative and are not intended to limit the present invention. Based on the embodiments of the present invention shown below, all other embodiments obtained by those of ordinary skill in the art without creative work are within the scope of protection of the embodiments of the present invention.

[0017] Example 1 In this embodiment, further, Figure 1 FIG. 1 is a schematic diagram of the structure of the optical frequency comb system for stabilizing optical fiber link delay jitter according to the present invention. As can be seen from the figure, in this embodiment, the specific structure of the interference unit is as follows: a first coupler, configured to combine the optical signal generated by the optical frequency comb with an input signal and input the combined signal into a first wavelength division multiplexer; a first wavelength division multiplexer, configured to perform wavelength multiplexing on the combined optical signal and output the resultant signal to the polarization beam splitter; a polarization beam splitter, used to separate the polarization states of the optical signal and output them; and The second wavelength division multiplexer is used to receive the optical signal processed by the polarization beam splitter.

[0018] The reciprocating correction unit comprises: a Faraday rotator, used for receiving the optical signal from the second wavelength division multiplexer and isolating the reverse optical signal; The acousto-optic frequency shifter is used to perform the first frequency shift on the optical signal and then perform the second frequency shift after reflection from the Faraday rotator. A tunable optical delay line for adjusting the transmission delay of an optical signal; and Optical fiber links are used to carry optical signals and generate delay jitter.

[0019] The optical signal transmitted through the optical fiber link is split by the second coupler and then transmitted to the dual-light secondary frequency mixing unit.

[0020] The dual-light secondary frequency mixing unit includes: Optical filters are used to remove stray wavelengths from the split optical signal. The optical filters utilize a programmable WaveShaper to control bandpass filtering parameters and select the teeth of different-order optical frequency combs. The optical frequency comb is not an input signal; rather, it serves as a sensing mechanism in the system. By adjusting the optical filter's filtering parameters, different-order optical frequency comb teeth are generated. These teeth are used to detect differences in optical link delay and jitter. In the optical frequency comb sensing system, a probe signal is used to detect specific frequency components of optical link delay and jitter. The probe signal is essentially a single frequency signal or a group of frequencies, filtered from the comb output of the optical frequency comb. This allows for flexible frequency component selection and a wide range of frequencies.

[0021] Two photodetectors for converting optical signals into electrical signals; Two electrical filters, used for filtering out noise from the electrical signals output by the photodetector respectively; A mixer, configured to mix two electrical signals to obtain a difference frequency signal; and A proportional-integral controller generates a control signal based on the difference frequency signal and feeds it back to the tunable optical delay line. The proportional-integral controller has Kp = 10, Ki = 3.5, and Kd = 2.6. This design is based on the system's need for high-precision, real-time delay jitter control. By optimizing the synergy between the proportional, integral, and differential components, it achieves precise compensation for fiber link delay jitter. The proportional component directly amplifies the error signal and quickly generates a control variable to reduce delay jitter. A Kp value of 10 shortens system response time and ensures timely feedback to real-time delay jitter, such as rapid fluctuations in the fiber link caused by environmental disturbances. Furthermore, given that fiber link delay jitter can fluctuate frequently due to factors such as temperature and stress, a high Kp value increases the system's sensitivity to high-frequency jitter and prevents jitter accumulation. The integral component accumulates historical errors to eliminate the system's steady-state deviation, i.e., residual errors that cannot be completely eliminated by proportional control. A moderate value of Ki = 3.5 ensures efficient error cancellation while avoiding integral windup, a problem where long-term integration results in excessive control variables and overshoot. The differential phase predicts the error trend and applies damping in advance, suppressing system overshoot and enhancing dynamic stability. A value of Kd = 2.6 effectively reduces the risk of oscillation caused by the rapid response of the proportional phase, making it particularly suitable for tunable optical delay lines that include motors and piezoelectric ceramics.

[0022] The first wavelength division multiplexer is provided with at least two input ports and one output port, the input ports are used to input optical frequency comb optical signals and input signals respectively, and the output port is used to output the multiplexed optical signal.

[0023] The tunable optical delay line is configured using a motor and piezoelectric ceramics. The motor has compensation accuracy in the order of fs, speed in the order of milliseconds, and compensation range in the order of nanoseconds. The piezoelectric ceramic transducer (PZT) has compensation accuracy in the order of sub-fs, speed in the order of sub-milliseconds, and range in the order of picoseconds. The two work together to achieve fast, wide-range, and high-precision delay and jitter compensation for optical fiber links. The motor (with millisecond response speed) and the piezoelectric ceramic (with sub-millisecond response speed) in the tunable optical delay line are parameter-matched using a proportional-integral derivative (PID) controller to achieve "wide-range coarse adjustment + high-precision fine adjustment" synergistic compensation. The voltage signal output by the PID controls the motor and the piezoelectric ceramic, which each provide high-precision, fast, and wide-range compensation, respectively. This synergistic mechanism avoids the limitations of individual actuators (such as insufficient motor precision and limited piezoelectric ceramic range) and achieves a balance between efficiency and accuracy through PID parameter optimization.

[0024] The fiber link is set to 1 km in length, and the Faraday rotator is configured in a round-trip configuration. 1 km of fiber can provide the functionality of 2 km, and the system feedback compensates for the round-trip fiber link delay jitter.

[0025] The optical filter is used to select the teeth of the optical frequency comb of different orders, and the upper limit frequency and the lower limit frequency of the filter are set according to the order of the optical frequency comb teeth to be selected to realize the function of the bandpass filter.

[0026] By adjusting the optical filter's filtering parameters, the frequency components of the fiber link's delay jitter at the corresponding frequencies are determined. The filtering parameters are set based on the optical frequency comb spectrum measured by a spectrometer, ensuring that the frequency spacing between the two filtered comb teeth is twice the frequency shift of the acousto-optic frequency shifter. By controlling the filtering parameters through the optical filter and selecting comb teeth of different orders, the filtering range is wider and more flexible than that of traditional optical filters.

[0027] The working principle and working process of the present invention are as follows: the optical frequency comb is divided into two signals by a first coupler, one of which serves as a reference signal. The other signal passes through a polarization beam splitter, first introduces a time delay through an optical fiber link, then enters an acousto-optic frequency shifter for frequency shifting, and is reflected and transmitted back by a Faraday rotator at the far end. The Faraday rotator is used to rotate the polarization direction of the light to ensure the transmission stability of the optical signal in the system. Next, it is frequency shifted by the acousto-optic frequency shifter, then by the optical fiber link, and finally passes through a polarization beam splitter. It is coupled with the local end signal through a second coupler and filtered by a bandpass filter. The function of the bandpass filter here is realized by an optical filter. The optical filter performs filtering based on the filtering parameters. Each bandpass filter outputs two optical signals with the same order of optical frequency comb teeth in the reference signal and the link that have been frequency-shifted by the acousto-optic frequency shifter. Since the frequency shift amount of the acousto-optic frequency shifter is much smaller than the frequency spacing of the comb teeth, two optical frequency comb teeth with a frequency spacing of twice the frequency shift amount of the acousto-optic frequency shifter can be obtained after filtering. Similar to the delayed self-heterodyne, the beat frequency of the two optical signals is obtained to obtain an intermediate frequency signal containing phase information. The difference is that in the dual-optical secondary mixing unit, a separate filter is used to filter out two optical frequency comb teeth with frequencies that differ by twice the frequency shift of the acousto-optic frequency shifter. The optical filter functions as two bandpass filters, outputting two sets of optical signals. The passbands of the four optical signals contained in the two sets of optical signals differ, and the order of the comb teeth used to filter out the optical signals is also different. The two optical frequency comb teeth, which differ by twice the frequency shift of the acousto-optic frequency shifter, generate a beat frequency signal after passing through a photodetector. Because the dual-optical secondary mixing structure includes two delayed self-heterodyne structures, two electrical signals with the same frequency but different phases are generated. A zero-frequency voltage signal is generated through the mixer. This signal is processed by a proportional-integral controller and fed back to the tunable optical delay line in the optical fiber link to compensate for the delay jitter in the optical fiber link sensed by the optical frequency comb teeth. The design of the proportional-integral controller parameters (Kp=10, Ki=3.5, and Kd=2.6) is based on the triple goals of delay and jitter control for optical fiber links: fast response, steady-state accuracy, and dynamic stability. By optimizing the weights of the proportional, integral, and differential components, this system achieves a comprehensive improvement in femtosecond accuracy, sub-millisecond response speed, and interference resistance. This parameter combination not only adapts to the mechanical characteristics of tunable optical delay lines but also addresses the core issues of insufficient accuracy and poor real-time performance in existing technologies through a closed-loop feedback mechanism, providing a highly reliable delay and jitter control solution for optical fiber communications, precision measurement, and other fields.

[0028] The dual-optical secondary mixing unit of the present invention includes two delayed self-heterodyne interference units, which use optical frequency domain signals to more accurately perceive the optical fiber link delay jitter. Through photoelectric conversion, two radio frequency signals carrying the optical fiber link delay jitter are used to obtain a zero-frequency voltage signal through a mixer. After being processed by a proportional-integral controller, the zero-frequency voltage signal serves as the input voltage signal of a coordinative optical delay line, which plays a role in controlling the optical fiber link delay jitter. The optical frequency comb teeth of different orders are selected through an optical filter, and the filtering parameters of the optical filter are adjusted to obtain different frequency components for perceiving the optical fiber link delay jitter. The frequency components can be selected in a flexible manner and over a wide range. The optical path architecture design includes an integrated wavelength division multiplexer, polarization beam splitter, Faraday rotator, acousto-optic frequency shifter, and tunable optical delay line. Combined with a dual-optical secondary mixing unit, the optical frequency comb is used as a high-precision reference source. After photoelectric conversion and mixing processing, the delay jitter information is accurately extracted and the tunable optical delay line is driven in real time for compensation. The stable delay jitter is at the femtosecond level, which significantly improves the accuracy and real-time performance of the optical fiber link delay jitter control, and effectively guarantees the stability and reliability of the optical fiber link signal transmission. The high-order comb tooth power of the optical frequency comb can meet the phase-locking requirements and has higher stability. The cost is low, the probe signal frequency selection is flexible, the selection range is wide, and the accuracy is high.

[0029] The foregoing description describes specific embodiments of the present invention. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims can be performed in an order different from that described in the embodiments and still achieve the desired results. Furthermore, the processes depicted in the accompanying drawings do not necessarily require the specific order shown or sequential order to achieve the desired results. In certain embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0030] In the description of the embodiments of the present invention, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present invention. In the embodiments of the present invention, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in the embodiments of the present invention and the features of different embodiments or examples, unless they are mutually inconsistent.

[0031] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of the embodiments of the present invention, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0032] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code comprising one or more executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred implementation of the embodiments of the invention includes alternative implementations in which functions may be performed out of the order shown or discussed, including performing functions in a substantially simultaneous manner or in reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the invention pertain.

[0033] The above description is only a preferred embodiment of the embodiment of the present invention and is not intended to limit the embodiment of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the embodiment of the present invention should be included in the scope of protection of the embodiment of the present invention.

Claims

1. The optical frequency comb system for stabilizing optical fiber link delay jitter is characterized by: include: An optical frequency comb, used to provide a comb-shaped optical signal and transmit it to an interference unit; an interference unit, configured to interfere with the comb-shaped optical signal from the optical frequency comb; The round-trip correction unit is used to perform reverse isolation and frequency modulation on the interfered optical signal, and transmit it to the dual-optical secondary mixing unit after light splitting; as well as The dual-optical secondary mixing unit is used to obtain a zero-frequency voltage signal through photoelectric conversion, and the zero-frequency voltage signal is processed by a proportional-integral controller as the input voltage signal of the tunable delay line to control the delay jitter of the optical fiber link.

2. The optical frequency comb system for stabilizing optical fiber link delay jitter according to claim 1, characterized in that: The interference unit comprises: a first coupler, configured to combine the optical signal generated by the optical frequency comb with an input signal and input the combined signal into a first wavelength division multiplexer; a first wavelength division multiplexer, configured to perform wavelength multiplexing on the combined optical signal and output the resultant signal to the polarization beam splitter; a polarization beam splitter, used to separate the polarization states of the optical signal and output them; and The second wavelength division multiplexer is used to receive the optical signal processed by the polarization beam splitter.

3. The optical frequency comb system for stabilizing optical fiber link delay jitter according to claim 1, characterized in that: The reciprocating correction unit comprises: a Faraday rotator, used for receiving the optical signal from the second wavelength division multiplexer and isolating the reverse optical signal; The acousto-optic frequency shifter is used to perform the first frequency shift on the optical signal and then perform the second frequency shift after reflection from the Faraday rotator. A tunable optical delay line for adjusting the transmission delay of an optical signal; and Optical fiber links are used to carry optical signals and generate delay jitter.

4. The optical frequency comb system for stabilizing optical fiber link delay jitter according to claim 3, characterized in that: The optical signal transmitted through the optical fiber link is split by the second coupler and then transmitted to the dual-light secondary frequency mixing unit.

5. The optical frequency comb system for stabilizing optical fiber link delay jitter according to claim 1, characterized in that: The dual-light secondary frequency mixing unit comprises: Optical filter, used to filter out stray wavelengths from the split optical signal; Two photodetectors for converting optical signals into electrical signals; Two electrical filters, used for filtering out noise from the electrical signals output by the photodetector respectively; A mixer, configured to mix two electrical signals to obtain a difference frequency signal; and The proportional-integral controller is used to generate a control signal according to the difference frequency signal and feed the control signal back to the tunable optical delay line.

6. The optical frequency comb system for stabilizing optical fiber link delay jitter according to claim 2, characterized in that: The first wavelength division multiplexer is provided with at least two input ports and one output port, the input ports are used to input optical frequency comb optical signals and input signals respectively, and the output port is used to output the multiplexed optical signal.

7. The optical frequency comb system for stabilizing optical fiber link delay jitter according to claim 3, characterized in that: The tunable optical delay line is configured as a motor and piezoelectric ceramics.

8. The optical frequency comb system for stabilizing optical fiber link delay jitter according to claim 3, characterized in that: The length of the optical fiber link is set to 1 km, and the Faraday rotator is set to a round-trip structure.

9. The optical frequency comb system for stabilizing optical fiber link delay jitter according to claim 5, characterized in that: The optical filter is used to select teeth of different orders of the optical frequency comb.

10. The optical frequency comb system for stabilizing optical fiber link delay jitter according to claim 5, characterized in that: The frequency component of the optical fiber link delay jitter at the corresponding frequency is obtained by adjusting the filtering parameters of the optical filter.

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