Smart city sensor signal quality improvement method, system and device and medium

Abstract

The invention discloses a smart city sensor signal quality improvement method, system and equipment and a medium. The method comprises the steps of constructing a device for generating an optical frequency comb based on a cascaded intensity modulator and a phase modulator; aiming at the optical transmission abnormal data, marking and tracking the optical transmission data in each transmission link by adopting a fanotify technology and a reverse traceability technology; an environment experiment device based on the virtual reality technology is constructed, and an environment experiment based on the virtual reality technology is carried out by adopting an optical information storage technology of a continuous laser. The method can improve the signal quality of the smart city sensor, and guarantees the accuracy and reliability of data.

Description

Technical Field

[0001] The present invention relates to the field of laser communication technology, and in particular to a method, system, device and medium for improving the signal quality of smart city sensors. Background Art

[0002] Air-to-ground collaborative high-speed laser communication has become a future development trend, especially in some emergency communication scenarios, such as confidential investigation, long-distance communication, etc., which require rapid transmission of information to the local area. Although coherent laser communication systems can provide higher transmission capacity, in order to balance system complexity and cost, high-speed multiplexing communication technology has been introduced into the system. From the perspective of the maturity of existing multiplexing technology, wavelength division multiplexing has been proposed as an effective technical means to improve the transmission rate of laser communication systems. In addition, for a typical wavelength division multiplexing laser communication system, a certain number of lasers are usually used as wavelength division multiplexing light sources at a certain wavelength interval. With the continuous development of intensive bandwidth services and the gradual increase in transmission capacity, dense wavelength division multiplexing can be achieved by reducing the interval between laser output wavelengths to improve spectrum utilization. Summary of the invention

[0003] The purpose of the present invention is to provide a method, system, device and medium for improving the signal quality of smart city sensors. The present invention can improve the signal quality of smart city sensors and ensure the accuracy and reliability of data.

[0004] A method for improving the quality of smart city sensor signals, comprising:

[0005] Construct a device to generate optical frequency comb based on cascaded intensity modulator and phase modulator;

[0006] For abnormal optical transmission data, fanotify technology and reverse tracing technology are used to mark and track the optical transmission data in each transmission link;

[0007] Construct an environmental experiment device based on virtual reality technology, and use continuous laser optical information storage technology to conduct environmental experiments based on virtual reality technology.

[0008] The device for generating an optical frequency comb based on a cascaded intensity modulator and a phase modulator comprises: a continuous laser, a cascaded intensity modulator, a phase modulator, an optical delay line, a dispersive medium and a frequency-adjustable radio frequency signal source.

[0009] To achieve the above purpose, the technical solution provided by the present invention is:

[0010] In the device for generating an optical frequency comb, the initial electric field of the optical carrier output by the continuous laser is:

[0011] E in(t) = E0exp(iω0t)

[0012] Where, E0 represents the amplitude of the initial optical carrier, ω0 represents the angular frequency of the initial optical carrier; E in (t) represents the initial electric field of the optical carrier output by the continuous laser;

[0013] When a sinusoidal signal is applied to the intensity modulator, its output electric field is expressed as:

[0014]

[0015] In the formula, E IM (t) represents the output electric field of the intensity modulator loaded with a sinusoidal signal, V1(t) and V2(t) represent the modulation voltages acting on the upper and lower arms of the intensity modulator respectively; when the intensity modulator is in push-pull mode, V1(t) = -V2(t), and the modulation voltage is expressed as V(t) = V DC +V RF cos(ωt), where V DC is the DC bias voltage on the intensity modulator, V RF cos(ωt) represents the microwave modulation voltage at the RF end; π represents the phase change, V π Indicates the driving voltage value corresponding to the phase change of the intensity modulated half-wave voltage;

[0016] After the phase modulator, the output electric field is expressed as:

[0017]

[0018] In the formula, E PM (t) represents the output electric field of the phase modulator, J n represents the nth-order Bessel function; Δθ is the modulation coefficient of the phase modulator. When the modulation coefficient is zero, there is no harmonic component. As the modulation coefficient increases, the resonant component will increase and the optical frequency comb spectrum lines will increase.

[0019] The fanotify technology reverse tracing technology is used to mark and track the optical transmission data in each transmission link, including:

[0020] After the deployed bait file is encrypted and tampered with by the ransomware, the AI ​​Agent uses fanotify technology to trace the path and related information of the ransomware process file. It first combines the network nodes of the smart community base station to increase the tracing range before sending it to the user UE.

[0021] When the user UE receives the file encryption and tampering alarm and the ransomware file path information at the front end, the user UE can choose to isolate or delete the ransomware file, and compare it with all nodes in the SIB network topology to mark the virus isolation;

[0022] After the virus file is isolated or deleted, the processing result is fed back to the user UE.

[0023] The optical information storage technology using continuous lasers is used to conduct environmental experiments based on virtual reality technology, specifically: a continuous laser is used to deploy an all-optical beam splitter, and a continuous laser optical information storage technology is used; optical data is temporarily stored in corresponding splitting ratios according to different sources through the optical information storage technology, and the number of splitting ratios is controlled when injected into the electrical amplifier.

[0024] In the environmental experiment based on virtual reality technology, the experimental device includes a transmitting end and a testing end; in the transmitting end, a RF signal source generates a sinusoidal signal which is divided into two signals through an optical coupler, and the two signals are respectively injected into an electrical amplifier for amplification, and the amplified electrical signals are respectively used to drive a Mach-Zehnder modulator and a phase modulator, and the optical carrier modulated by the Mach-Zehnder modulator is transmitted through an adjustable optical delay line and then incident on an EDFA for power amplification, and the amplified optical signal is then incident on a phase modulator for modulation, and then transmitted to the testing end through a polarization controller and a single-mode optical fiber.

[0025] The test end is composed of a spectrometer and an autocorrelator, which measure the spectrum and pulse width of the optical frequency bridge in the frequency domain and time domain respectively; a polarization controller is arranged in front of the incident port of the autocorrelator to align the polarization state of the input light with the main axis of the phase modulator to keep the polarization state of the optical path consistent.

[0026] A smart city sensor signal quality improvement system, comprising:

[0027] An optical frequency comb generation module, used to construct a device module for generating an optical frequency comb based on a cascaded intensity modulator and a phase modulator;

[0028] The optical transmission anomaly processing module is used to mark and track the optical transmission anomaly data in each transmission link by using fanotify technology and reverse tracing technology;

[0029] The environmental experiment module is used to construct an environmental experiment device based on virtual reality technology, and uses continuous laser optical information storage technology to conduct environmental experiments based on virtual reality technology.

[0030] An electronic device comprises: a memory, a processor and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the method for improving the signal quality of smart city sensors as described above is implemented.

[0031] A computer-readable storage medium stores a computer program, wherein the computer program enables a computer to execute the method for improving the quality of smart city sensor signals as described above.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] Aiming at the technical bottleneck problem in the field of high-speed multiplexed communication, the present invention constructs a device for generating an optical frequency comb based on a cascaded intensity modulator and a phase modulator according to the theory of generating an optical frequency comb by an electro-optical modulator; secondly, the fanotify technology and reverse tracing technology are used to mark and track the optical transmission data in each transmission link for abnormal transmission data; finally, in the electro-optical modulator experimental device, the optical information storage technology of a continuous laser is used to replace the avalanche breakdown photodetector or the PN type photodetector to carry out an environmental experiment based on virtual reality technology, firstly, the optical data is temporarily stored in the corresponding splitting ratio according to different sources through the optical information storage technology, and the number of the splitting ratio can be controlled when injected into the electrical amplifier, and the sufficient overvoltage of the stored optical signal itself can also be used to make up for the deficiency that the avalanche breakdown photodetector needs a large overvoltage to ensure the normal operation of the detector.

[0034] The present invention uses fanotify technology to reversely trace the abnormal problems that may exist in the transmission links of the electro-optical modulator in the optical transmission data. These problems can be stored in the chip in the form of log text or configuration files. When the configuration operation is performed, the file is traced and located first. By analyzing these abnormal link problems, the number of "avalanche breakdown" is reduced. The present invention uses optical information storage technology to overcome the non-scalability of the traditional beam splitter with a fixed beam splitting ratio, and uses continuous laser optical information storage technology to replace avalanche breakdown photodetectors, thereby reducing the breakdown voltage of the device caused by avalanche breakdown, affecting the reliability and stability of the device, and avoiding the performance of the device may be degraded due to avalanche breakdown, such as threshold voltage changes, leakage current increase, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 : Schematic diagram of the process of improving the signal quality of smart city sensors of the present invention.

[0036] Figure 2 : Schematic diagram of the structure of the device for generating an optical frequency comb based on a cascaded intensity modulator and a phase modulator of the present invention.

[0037] Figure 3 : A schematic diagram of the device structure of the environmental experiment device based on virtual reality technology of the present invention. DETAILED DESCRIPTION

[0038] The above contents of the present invention are further described in detail below in the form of embodiments, but this should not be understood as the scope of the above subject matter of the present invention being limited to the following embodiments, and all technologies realized based on the above contents of the present invention belong to the scope of the present invention.

[0039] Some of the terms involved in the solution of the present invention are explained as follows:

[0040] Positive chirp refers to the physical phenomenon that the frequency of a signal changes with time. When the frequency increases with time, the low-frequency wave is seen first and then the high-frequency wave, that is, the rising front edge is low-frequency and the falling back edge is high-frequency. This phenomenon is usually used to describe the propagation of light waves in dispersive media, especially in the field of high-speed signal transmission, such as the compression of the wave packet pulse width of ultra-short optical pulses. Positive chirp can be used to compress the pulse width through a grating pair, because the optical path of the low-frequency wave is longer than that of the high-frequency light, and the wave propagation time is also longer, so the high-frequency sub-wave packet can catch up with the low-frequency sub-wave packet to achieve pulse width compression. The chirp effect can be suppressed by reasonable dispersion control, such as reserving a certain amount of residual dispersion during optical fiber transmission to reduce the chirp phenomenon and improve signal performance.

[0041] Augmented Reality (AR) technology is a technology that cleverly integrates virtual information with the real world. It widely uses multimedia, three-dimensional modeling, real-time tracking and registration, intelligent interaction, sensing and other technical means to simulate computer-generated text, images, three-dimensional models, music, video and other virtual information, and apply them to the real world. The two types of information complement each other, thereby achieving "enhancement" of the real world. Unlike VR, AR emphasizes the integration of virtual and reality rather than completely replacing reality. The existing asset positioning technology has large coordinate positioning errors, and there is an overlap problem in the positioning of multiple sensors at close range.

[0042] Ransomware: It is an executable malicious program that is mainly spread in the form of emails, program Trojans, and web page Trojans. The virus uses various complex encryption algorithms to encrypt files. Infected files are generally impossible to decrypt and can only be cracked if the private key for decryption is obtained.

[0043] In one embodiment of the present invention, a method for improving the quality of smart city sensor signals is proposed. Figure 1 As shown, including:

[0044] Construct a device to generate optical frequency comb based on cascaded intensity modulator and phase modulator;

[0045] For abnormal optical transmission data, fanotify technology and reverse tracing technology are used to mark and track the optical transmission data in each transmission link;

[0046] Construct an environmental experiment device based on virtual reality technology, and use continuous laser optical information storage technology to conduct environmental experiments based on virtual reality technology.

[0047] The technical solution of the present invention is further described in detail below in conjunction with specific implementation methods:

[0048] First, based on the theory of electro-optic modulator generating optical frequency comb, a device based on cascaded intensity modulator and phase modulator generating optical frequency comb is constructed, such as Figure 2 As shown, it includes a continuous laser (CW-Laser), a cascaded intensity modulator (IM) and phase modulator (PM), an optical delay line (DL), a dispersive medium (Dispersive Medium) and a frequency-adjustable radio frequency (RF) signal source. The initial electric field of the continuous laser output optical carrier is defined as:

[0049] E in (t) = E0exp(iω0t)

[0050] Where E0 and ω0 represent the amplitude and angular frequency of the initial optical carrier respectively. When the sinusoidal signal is loaded into the intensity modulator, its output electric field is expressed as:

[0051]

[0052] In the formula, E IM (t) represents the output electric field of the intensity modulator loaded with a sinusoidal signal, V1(t) and V2(t) represent the modulation voltages acting on the upper and lower arms of the intensity modulator, respectively. π Represents the half-wave voltage of intensity modulation, that is, the driving voltage value corresponding to the phase change of π. Most intensity modulators work in push-pull mode, which is expressed as V1(t) = -V2(t). The modulation voltage can be expressed as V(t) = V DC +V RF cos(ωt), where V DC is the DC bias voltage on the intensity modulator, V RF cos(ωt) represents the microwave modulation voltage at the RF end. After passing through the phase modulator, its output electric field can be expressed as:

[0053]

[0054] Where J nrepresents the nth-order Bessel function, Δθ is the modulation coefficient of the phase modulator. When the modulation coefficient is zero, there is no harmonic component. As the modulation coefficient increases, the resonant component increases, which means the increase of the optical frequency comb spectrum. By changing the DC voltage and the amplitude of the sinusoidal signal loaded to the intensity modulation, the output pulse of the intensity modulator can be adjusted, and then the optical frequency comb output after phase modulation can be changed.

[0055] For abnormal transmission data, fanotify technology and reverse tracing technology are used to mark and track the optical transmission data in each transmission link.

[0056] First, after the deployed bait file is encrypted and tampered with by the ransomware, when the Agent traces the path and related information of the ransomware process file through fanotify technology, it first combines the network node of the smart cell base station to increase the tracing range and then sends it to the user UE. fanotify is a new file monitoring technology on the Linux platform, which is often used as malicious access control for antivirus software or virus programs. The present invention mainly traces back the abnormal data in the report uploaded by the user's mobile phone, and finds the tracing process of which SIB nodes in the cell 5G network are abnormal before the customer uploads the abnormal report.

[0057] Secondly, ransomware processing. When the user UE receives the file encryption and tampering alarm, the ransomware file path and other information at the front end, it can choose to isolate or delete the ransomware file. At the same time, it is compared with all nodes in the SIB network topology, and the duplicated nodes are marked for virus isolation.

[0058] Then, the processing result is fed back. After the management platform isolates or deletes the virus file, it feeds back the processing result to the user UE to tell the user whether the processing is successful.

[0059] The structure of the avalanche photo detector (APD) is similar to that of the PN photo detector, but a sufficiently large bias voltage is required to ensure that collision ionization can be caused. In the electro-optic modulator experimental device, the optical information storage technology of the continuous laser is used to replace the avalanche photo detector or the PN photo detector to carry out environmental experiments based on virtual reality technology. The advantage of this is that the optical data is first temporarily stored in the corresponding beam splitting ratio according to different sources through the optical information storage technology, and the number of beam splitting ratios can be controlled when injected into the electrical amplifier. It can also be based on the overvoltage of the stored optical signal itself, which makes up for the deficiency that the avalanche breakdown photo detector requires a large overvoltage to ensure the normal operation of the detector.

[0060] The structure of the avalanche photo detector (APD) is similar to that of the PN photodetector, but it requires a sufficiently large bias voltage to ensure that it can cause collision ionization. The APD must work under controllable avalanche. Due to the avalanche effect, each photon can excite a large number of free electron-hole pairs. The larger the multiplication factor of the detector APD, the greater the current gain, which in turn leads to an increase in responsivity. But at the same time, a large multiplication factor will cause the duration of the avalanche effect to increase, and the intrinsic bandwidth of the detector will also decrease. Therefore, it is necessary to select a suitable multiplication factor to compromise between responsivity and bandwidth. In optical communication systems, when using APD, the following issues need to be noted: First, avalanche will cause amplified warm sound in the presence of light, that is, the noise of "1" is greater than the noise of data "0". Secondly, the supply voltage must be controlled within a certain range to avoid irreversible breakdown. Thirdly, APD is a high-voltage device. When working with a low-voltage integrated circuit, dual power supplies must be provided and a voltage stabilization circuit must be well prepared. This type of detector also has many advantages and disadvantages. The advantages are that the photon detection efficiency is greatly improved, the light response rate is also improved, and the noise is relatively low. The disadvantage is that a large overvoltage is required to ensure the normal operation of the detector, and it can only be used in specific environments.

[0061] An all-optical beam splitter is deployed in the continuous laser in the electro-optic modulator experimental device, and optical information storage technology is used to overcome the non-scalability of the traditional beam splitter with a fixed splitting ratio.

[0062] All-optical beam splitters are a very important type of component in modern physics. They can split incident light into multiple beams in the space or time domain, and play an important role in building interferometers, realizing optical information processing, and revealing the quantum properties of single photons. Traditional beam splitters are designed with one or more coatings covering a transparent substrate. The disadvantage is that once manufactured, the splitting ratio is fixed. According to the needs of physical experiments and engineering applications, highly tunable beam splitters based on gradient metasurfaces, electromagnetically induced transparency, and optically controlled light have been proposed so far.

[0063] In the electro-optic modulator experimental device, the optical information storage technology of continuous laser is used to replace the avalanche breakdown photodetector or PN type photodetector. The advantage of this is that the optical data is first temporarily stored in the corresponding splitting ratio according to different sources through the optical information storage technology, and the number of splitting ratios can be controlled when injected into the electrical amplifier. It can also be based on the overvoltage of the stored optical signal itself, which makes up for the deficiency that the avalanche breakdown photodetector requires a large overvoltage to ensure the normal operation of the detector.

[0064] The specific process of the experiment based on the virtual reality technology environment is carried out. Based on the theoretical analysis of the electro-optical modulation to generate the optical frequency comb, the present invention conducts experimental research on it. The experimental device includes two parts: the transmitting end and the testing end. Figure 3 shown.

[0065] At the transmitting end, the specific frequency sinusoidal signal (25GHz and 40GHz are studied in this invention) generated by the RF signal source is divided into two signals through a 3dB optical coupler, and then injected into two electrical amplifiers for amplification. The amplified electrical signals are used to drive the Mach-Zehnder modulator (MZM) and the phase modulator (PM). The optical carrier of a specific wavelength output by the continuous laser is directly incident on the Mach-Zehnder modulator for modulation, and then transmitted through an adjustable optical delay line (ODL) and then incident on the EDFA for power amplification. The amplified optical signal is then incident on the phase modulator for modulation, and then transmitted to the test end through a polarization controller and a single-mode optical fiber. The test end consists of two parts: a spectrometer and an autocorrelator, which measure the spectrum and pulse width of the optical frequency bridge in the frequency domain and time domain respectively. Considering that the autocorrelator itself is sensitive to polarization, a polarization controller is set in front of the autocorrelator incident port in the experiment. In the device, the optical delay line is used to achieve time-matching between the phase modulator and the Mach-Zehnder modulator. When the length of the optical delay line is adjusted to the optimal length, the positive chirp generated in the phase modulator is retained and the negative chirp is removed. The polarization controller (PC) is used to align the polarization state of the input light with the main axis of the modulator to keep the polarization state of the optical path consistent.

[0066] In another embodiment, the present invention provides a smart city sensor signal quality improvement system, comprising:

[0067] An optical frequency comb generation module, used to construct a device module for generating an optical frequency comb based on a cascaded intensity modulator and a phase modulator;

[0068] The optical transmission anomaly processing module is used to mark and track the optical transmission anomaly data in each transmission link by using fanotify technology and reverse tracing technology;

[0069] The environmental experiment module is used to construct an environmental experiment device based on virtual reality technology, and uses continuous laser optical information storage technology to conduct environmental experiments based on virtual reality technology.

[0070] In another embodiment of the present invention, an electronic device is proposed, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the method for improving the signal quality of smart city sensors as described above is implemented.

[0071] In another embodiment, the present invention provides a computer-readable storage medium storing a computer program, wherein the computer program enables a computer to execute the method for improving the quality of smart city sensor signals as described above.

[0072] In the embodiments disclosed in the present application, the computer storage medium can be a tangible medium that can contain or store a program for use by or in conjunction with an instruction execution system, device or equipment. The computer storage medium can include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices or equipment, or any suitable combination of the above. More specific examples of computer storage media can include electrical connections based on one or more lines, portable computer disks, hard disks, random access memories (RAM), read-only memories (ROM), erasable programmable read-only memories (EPROM or flash memory), optical fibers, portable compact disk read-only memories (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the above.

[0073] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any technician familiar with the profession, without departing from the scope of the technical solution of the present invention, according to the technical essence of the present invention, any simple modification, equivalent replacement and improvement made to the above embodiment still falls within the protection scope of the technical solution of the present invention.

Claims

1. A method for improving the signal quality of smart city sensors, characterized in that: include: Construct a device to generate optical frequency comb based on cascaded intensity modulator and phase modulator; For abnormal optical transmission data, fanotify technology and reverse tracing technology are used to mark and track the optical transmission data in each transmission link; Construct an environmental experiment device based on virtual reality technology, and use continuous laser optical information storage technology to conduct environmental experiments based on virtual reality technology.

2. The method for improving the signal quality of smart city sensors according to claim 1, characterized in that: The device for generating an optical frequency comb based on a cascaded intensity modulator and a phase modulator comprises: a continuous laser, a cascaded intensity modulator, a phase modulator, an optical delay line, a dispersive medium and a frequency-adjustable radio frequency signal source.

3. The method for improving the signal quality of smart city sensors according to claim 2, characterized in that: In the device for generating an optical frequency comb, the initial electric field of the optical carrier output by the continuous laser is: E in (t)=E0exp(iω0t) Where, E0 represents the amplitude of the initial optical carrier, ω0 represents the angular frequency of the initial optical carrier; E in (t) represents the initial electric field of the optical carrier output by the continuous laser; When a sinusoidal signal is applied to the intensity modulator, its output electric field is expressed as: In the formula, E IM (t) represents the output electric field of the intensity modulator loaded with a sinusoidal signal, V1(t) and V2(t) represent the modulation voltages acting on the upper and lower arms of the intensity modulator respectively; when the intensity modulator is in push-pull mode, V1(t) = -V2(t), and the modulation voltage is expressed as V(t) = V DC +V RF cos(ωt), where V DC is the DC bias voltage on the intensity modulator, V RF cos(ωt) represents the microwave modulation voltage at the RF end; π represents the phase change, V π Indicates the driving voltage value corresponding to the phase change of the intensity modulated half-wave voltage; After the phase modulator, the output electric field is expressed as: In the formula, E PM (t) represents the output electric field of the phase modulator, J n represents the nth-order Bessel function; Δθ is the modulation coefficient of the phase modulator. When the modulation coefficient is zero, there is no harmonic component. As the modulation coefficient increases, the resonant component will increase and the optical frequency comb spectrum lines will increase.

4. The method for improving the signal quality of smart city sensors according to claim 1, characterized in that: The fanotify technology reverse tracing technology is used to mark and track the optical transmission data in each transmission link, including: After the deployed bait file is encrypted and tampered with by the ransomware, the AI ​​Agent uses fanotify technology to trace the path and related information of the ransomware process file. It first combines the network nodes of the smart community base station to increase the tracing range before sending it to the user UE. When the user UE receives the file encryption and tampering alarm and the ransomware file path information at the front end, the user UE can choose to isolate or delete the ransomware file, and compare it with all nodes in the SIB network topology to mark the virus isolation; After the virus file is isolated or deleted, the processing result is fed back to the user UE.

5. The method for improving the signal quality of smart city sensors according to claim 1, characterized in that: The optical information storage technology using continuous lasers is used to conduct environmental experiments based on virtual reality technology, specifically: a continuous laser is used to deploy an all-optical beam splitter, and a continuous laser optical information storage technology is used; optical data is temporarily stored in corresponding splitting ratios according to different sources through the optical information storage technology, and the number of splitting ratios is controlled when injected into the electrical amplifier.

6. The method for improving the signal quality of smart city sensors according to claim 1, characterized in that: In the environmental experiment based on virtual reality technology, the experimental device includes a transmitting end and a testing end; in the transmitting end, a RF signal source generates a sinusoidal signal which is divided into two signals through an optical coupler, and the two signals are respectively injected into an electrical amplifier for amplification, and the amplified electrical signals are respectively used to drive a Mach-Zehnder modulator and a phase modulator, and the optical carrier modulated by the Mach-Zehnder modulator is transmitted through an adjustable optical delay line and then incident on an EDFA for power amplification, and the amplified optical signal is then incident on a phase modulator for modulation, and then transmitted to the testing end through a polarization controller and a single-mode optical fiber.

7. The method for improving the signal quality of smart city sensors according to claim 6, characterized in that: The test end is composed of a spectrometer and an autocorrelator, which measure the spectrum and pulse width of the optical frequency bridge in the frequency domain and time domain respectively; a polarization controller is arranged in front of the incident port of the autocorrelator to align the polarization state of the input light with the main axis of the phase modulator to keep the polarization state of the optical path consistent.

8. A smart city sensor signal quality improvement system, characterized in that: include: An optical frequency comb generation module, used to construct a device module for generating an optical frequency comb based on a cascaded intensity modulator and a phase modulator; The optical transmission anomaly processing module is used to mark and track the optical transmission anomaly data in each transmission link by using fanotify technology and reverse tracing technology; The environmental experiment module is used to construct an environmental experiment device based on virtual reality technology, and uses continuous laser optical information storage technology to conduct environmental experiments based on virtual reality technology. The system is used to execute the smart city sensor signal quality improvement method as described in any one of claims 1 to 7.

9. An electronic device, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the method for improving the signal quality of a smart city sensor as described in any one of claims 1 to 7 is implemented.

10. A computer-readable storage medium storing a computer program, wherein the computer program enables a computer to execute the method for improving the quality of smart city sensor signals as described in any one of claims 1 to 7.

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