An underground tunnel optical fiber communication optimization system and method based on big data

Abstract

The present invention relates to the field of underground optical fibers, and specifically to an optimization system and method for underground tunnel optical fiber communication based on big data, including: a physical communication module, a loss compensation module, a signal modulation module, a multiplexing and coupling module, and a protocol conversion module. The physical communication module constitutes the physical medium for digital optical fiber communication. The loss compensation module is used to calculate the total loss inside the optical fiber. The signal modulation module is used to perform frequency-domain transformation on the current signal carrier and energy carrier. The multiplexing and coupling module is used to couple wavelength-division multiplexing signals and perform phase modulation. The protocol conversion module is used to calculate the transmission rate of the signal, change the carrier frequency and communication protocol. The present invention can reduce signal distortion, improve signal quality, extend the transmission distance of optical signals, improve signal transmission efficiency, reduce signal distortion, improve signal transmission quality and system stability, while reducing the interference of the environment on communication quality and improving communication adaptability.

Description

Technical Field

[0001] The present invention relates to the field of underground optical fibers, and in particular to a system and method for optimizing underground tunnel optical fiber communications based on big data. Background Art

[0002] In urban underground tunnels and other infrastructure, various municipal pipelines, including power, communications, gas, and water supply and drainage, are becoming increasingly centralized and unified, gradually transforming into integrated underground pipeline corridors. Within the complex and confined spaces of underground tunnels, digital optical cables, with their uniform signal coverage and strong environmental adaptability, have become the primary communication method in tunnels.

[0003] Digital optical cables use single-mode optical fiber as the transmission medium and transmit data in the form of digital signals. To increase the fiber's capacity, the energy carrier and information carrier are input into the fiber at different frequencies. However, due to the high energy density and long transmission distance, the nonlinear effects of the fiber can cause interference between the energy and information carriers. Interference signals mainly include stimulated Brillouin scattering, stimulated Raman scattering, and four-wave mixing, which affects the bit error rate of the transmitted information.

[0004] Conventional methods for suppressing nonlinear optical effects reduce nonlinear interference in single-mode optical fibers through wavelength division multiplexing. However, in the complex environment of underground tunnels, the physical parameters of the optical fiber change with temperature and bending, making the fundamental carrier frequency of the wavelength division signal no longer able to meet the minimum loss signal propagation conditions, resulting in the failure of suppressing optical fiber scattering interference. Summary of the Invention

[0005] The purpose of the present invention is to provide an underground tunnel optical fiber communication optimization system and method based on big data to solve the problems raised in the above background technology.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: an underground tunnel optical fiber communication optimization system based on big data, comprising: a physical communication module, a loss compensation module, a signal modulation module, a multiplexing coupling module and a protocol conversion module;

[0007] The physical communication module consists of a communication computer, a photoelectric converter, a pump light source, a multiplexing coupler, a single-mode optical fiber, an environmental collector, and a scattering compensator, forming the physical medium part of the digital optical fiber communication system. The environmental collector and scattering compensator are used to reduce the signal loss of optical fiber communication and avoid the influence of the external environment on the communication signal. The communication light wavelength range used by the single-mode optical fiber is 800nm-1550nm;

[0008] The loss compensation module is used to calculate the SBS, SRS, and four-wave mixing losses inside the optical fiber according to the optical fiber parameters and environmental collector parameters at the energy carrier frequency currently latched by the computer, determine the compensation amount of the scattering compensator for the carrier phase gain from the total loss, and output the functional relationship between the compensation amount and the energy carrier frequency;

[0009] The signal modulation module is used to compile the digital signal transmitted by the communication computer into an optical signal emitted by the pump light source, determine the frequency and length of the signal carrier according to the historical loss feedback, the frequency of the energy carrier, and the information volume of the source information, perform frequency domain transformation on the current signal carrier and energy carrier, and superimpose a cyclic verification signal on the signal carrier so that the current signal carrier and energy carrier have the minimum gain compensation amount after superposition;

[0010] The multiplexing and coupling module is used to couple the transformed signal carrier and energy carrier into a wavelength division multiplexing signal by using a multiplexing coupler, calculate the compensation amount of the carrier phase gain according to the frequency of the energy carrier corresponding to the wavelength division multiplexing signal, perform phase modulation on the wavelength division multiplexing signal, and the phase-modulated wavelength division multiplexing signal generates a communication optical wave through a light source and transmits the signal through a single-mode optical fiber;

[0011] The protocol conversion module is used to detect the wave by using the cyclic verification signal after the wavelength division multiplexing signal is received by the destination device, obtain the frequency of the signal carrier, so as to separate it from the energy carrier frequency, calculate the transmission rate of the signal in real time, and send back a protocol change signal when the transmission rate and bit error rate are lower than the threshold, and change the frequency of the energy carrier and the communication protocol of the signal carrier.

[0012] Further, the physical communication module includes: an optoelectronic conversion unit, a pump light source unit, and a digital optical fiber unit;

[0013] The optoelectronic conversion unit is used to provide a two-way conversion channel between the digital signal and the optical signal suitable for transmission in the optical fiber;

[0014] The pump light source unit is used to activate the pump light source according to the input command signal and emit communication light into the optical fiber;

[0015] The digital optical fiber unit is used to receive and compile digital signals, transmit communication optical signals, and compensate for the scattering loss of communication light in a single-mode optical fiber.

[0016] Further, the loss compensation module includes: a carrier frequency loss unit and a compensation gain unit;

[0017] The carrier frequency loss unit is used to calculate the stimulated Brillouin scattering, stimulated Raman scattering, and four-wave mixing losses in the optical fiber according to the parameters of the optical fiber and the frequency of the energy carrier;

[0018] The compensation gain unit is used to calculate the total loss with the frequency of the energy carrier as the independent variable and output a loss compensation function.

[0019] Further, the signal modulation module includes: a digital signal unit, a loss feedback unit, and a multiplexing transformation unit;

[0020] The digital signal unit is used to obtain the digital signal transmitted by the source device and convert the digital signal into a control signal for the light source.

[0021] The loss feedback unit is used to determine the frequencies and lengths of the signal carrier and the energy carrier to minimize the total loss of the superimposed signal.

[0022] The multiplexing transformation unit is used to integrate the signal carrier and the energy carrier by using a cyclic verification signal to generate a wavelength division multiplexing signal.

[0023] Further, the multiplexing coupling module includes: a wavelength division phase modulation unit and a gain output unit;

[0024] The wavelength division phase modulation unit is used to couple and modulate the wavelength division multiplexing signal and phase-modulate the wavelength division multiplexing signal according to the compensation amount of the carrier phase gain.

[0025] The gain output unit is used to add a verification pulse related to the cyclic verification signal after the multiplexed signal and activate the pump light source to excite the communication light of the wavelength division multiplexing signal in the optical fiber.

[0026] Further, the protocol conversion module includes: a compilation and detection unit and a transmission inspection unit;

[0027] The compilation and detection unit is used to convert the communication light into a wavelength division multiplexing signal and a verification pulse in the destination device, and demodulate and detect the cyclic verification signal and the signal carrier by frequency division.

[0028] The transmission inspection unit is used to calculate the transmission rate and bit error rate of the signal carrier and adjust the communication parameters and communication protocol in the optical fiber according to the calculation results.

[0029] An optimization method for underground tunnel optical fiber communication based on big data includes the following steps:

[0030] Step S1. Construct a physical transmission medium by a single-mode optical fiber transmission device, a communication computer, an environment collector, and a scattering compensator. The computer of the source device receives the digital signal and compiles it into a signal carrier for controlling the pump light source;

[0031] Step S2. Calculate the stimulated Brillouin scattering, stimulated Raman scattering, and four-wave mixing losses in the optical fiber according to the parameters of the optical fiber and the frequency of the energy carrier, accumulate the total loss with the frequency of the energy carrier as the independent variable, and output a loss compensation function;

[0032] Step S3. Determine the frequency and length of the signal carrier according to the loss compensation function, the frequency of the energy carrier, and the information volume of the source information. Superimpose a cyclic verification signal on the signal carrier to minimize the total loss after multiplexing the signal carrier and the energy carrier;

[0033] Step S4. Perform a frequency-domain transformation on the current signal carrier and energy carrier, couple them into a wavelength-division multiplexing signal, phase-modulate the wavelength-division multiplexing signal according to the compensation amount of the carrier phase gain, and add a verification pulse related to the cyclic verification signal after the multiplexing signal;

[0034] Step S5. Use the sink device to receive the optical signal, convert it into a wavelength-division multiplexing signal and a verification pulse. According to the verification pulse, obtain the cyclic verification signal by frequency division detection, separate the signal carrier, calculate the transmission rate and bit error rate according to the information volume and information loss of the signal carrier, and adjust the optical fiber communication parameters and communication protocol according to the calculation results.

[0035] Further, step S1 includes:

[0036] Step S11. Construct a physical transmission medium by a single-mode fiber transmission device, a communication computer, an environment collector, and a scattering compensator. The environment collector and the scattering compensator are used to reduce the signal loss of optical fiber communication and avoid the influence of the external environment on the communication signal. The single-mode fiber transmission device includes: an optical-electric converter, a pump light source, a multiplexing coupler, and a single-mode fiber. The communication optical wavelength range adopted by the single-mode fiber is 800 nm - 1550 nm;

[0037] Step S12. The source device converts the digital signal to be transmitted into a signal carrier according to the modulation protocol, so that the signal carrier can drive the pump light source to emit an optical signal consistent with the signal carrier. The modulation protocol includes: binary modulation protocol, multi-level modulation protocol, external modulation protocol, and extinction method modulation protocol.

[0038] Further, step S2 includes:

[0039] Step S21. Obtain the parameters of the optical fiber, including: optical fiber length, core radius, material optical conductivity, and refractive index, and calculate the total loss according to the following formula:

[0040]

[0041] where γ represents the wavelength of the energy carrier, P(γ) is the total transmission loss function of the optical fiber, P SBS 、P SRS and P SWM respectively represent stimulated Brillouin scattering, stimulated Raman scattering, and four-wave mixing loss, G is the threshold gain coefficient, A eff is the effective cross-sectional area of the optical fiber, L eff is the effective length of the optical fiber, n Band n R respectively represent the Brillouin gain coefficient and Raman gain coefficient of the optical fiber, P is the power of the energy carrier, and D γ is the dispersion coefficient of the energy carrier at wavelength γ;

[0042] Step S22. Input different energy carrier wavelengths pre-loaded in the computer into the total loss function P(γ) to obtain the losses of optical fiber transmission under different frequencies of energy carriers. Select t energy carriers closest to the signal carrier frequency, and use the energy carrier frequency with the smallest loss as the signal transmission frequency, where t is a preset parameter.

[0043] Furthermore, step S3 includes:

[0044] Step S31. Determine the modulation frequency of the signal carrier to minimize the total loss of the superimposed signal, and list the superimposed signal equation:

[0045]

[0046] where Q(t) = a·sin(γ1·t) + b·cos(γ1·t), Q(t) is the cyclic verification signal, a and b are verification coefficients, γ1 is the preset verification frequency, γ e is the signal transmission frequency of the energy carrier, E(t) is the signal carrier, * is the convolution symbol, γ L is the minimum loss wavelength, representing the value of the independent variable when P(γ) takes the minimum value within the range of [γ e -γ1, γ e +γ1];

[0047] Step S32. Adjust the values of the verification coefficients a and b to make the superimposed signal equation hold, and convert the values of a and b into binary pulse signals as the verification pulses for the current transmission process.

[0048] Furthermore, step S4 includes:

[0049] Step S41. Use a multiplexing coupler to perform frequency-domain transformation and integration on the signal carrier and energy carrier, and couple the wavelength-division multiplexing signal R(t). A decoupling capacitor is configured in the multiplexing coupler, and the decoupling capacitor is directly connected across the decoupling power supply and the ground wire;

[0050] Step S42. Phase-modulate the wavelength-division multiplexing signal according to the standard phase-modulation process to suppress the watt-level energy light in the single-mode optical fiber by the cross-modulation phase. Add verification pulses after the phase-modulated wavelength-division multiplexing signal and input it into the single-mode optical fiber for signal transmission.

[0051] Furthermore, step S5 includes:

[0052] Step S51. Obtain an optical signal using the destination device, restore the wavelength-division multiplexing signal and the verification pulse through an optoelectronic converter, generate a cyclic verification signal based on the verification pulse, decouple the wavelength-division multiplexing signal using the cyclic verification signal and the preloaded frequency of the energy carrier, and restore the signal carrier using the frequency division detection method;

[0053] Step S52. Recover the decoupled energy carrier signal, compare it with the standard energy carrier to obtain the bit error rate of the energy carrier. After restoring the signal carrier to a digital signal, divide the information volume of the digital signal by the transmission duration to obtain the signal transmission rate. When the bit error rate is higher than the threshold or the signal transmission rate is lower than the threshold, the destination device sends an adjustment request to the source device to change the communication parameters and communication protocol.

[0054] Compared with the prior art, the beneficial effects achieved by the present invention are as follows:

[0055] By constructing a dedicated tunnel optical fiber communication system, calculating the SBS, SRS, and four-wave mixing losses inside the optical fiber at different carrier frequencies, and determining the adjustment amount of the compensator phase gain from the total loss, the present invention can reduce signal distortion, improve signal quality, and at the same time ensure that the optical signal can be effectively transmitted in the optical fiber and extend the transmission distance of the optical signal. The present invention separately performs frequency isolation on the energy carrier and the signal carrier, superimposes a cyclic verification signal with the same frequency on the signal carrier, couples the signal carrier and the energy carrier into a wavelength-division multiplexing signal with a fixed frequency, and dynamically adjusts the carrier frequency according to the actual parameters of the optical fiber, so as to better adapt to different transmission conditions and network requirements, improve signal transmission efficiency, reduce signal distortion and wavelength drift, and improve signal transmission quality and system stability. By calculating the transmission rate of the signal in real time, the present invention sends back a protocol change signal when the transmission rate and the bit error rate are lower than the threshold, changes the frequency of the energy carrier and the conversion protocol of the signal carrier, realizes the inspection of the intrusion of burst signals and the adaptive protocol adjustment, reduces the interference of the environment on the communication quality, realizes the fast scheduling and optimization of the signal, and improves the adaptability of the network. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] The drawings are used to provide a further understanding of the present invention, and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention, and do not constitute a limitation to the present invention. In the drawings:

[0057] Figure 1 is a schematic structural diagram of an underground tunnel optical fiber communication optimization system based on big data according to the present invention;

[0058] Figure 2 is a schematic step diagram of an underground tunnel optical fiber communication optimization method based on big data according to the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0059] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0060] Please refer to Figure 1 , the present invention provides a technical solution: An underground tunnel optical fiber communication optimization system based on big data, including: a physical communication module, a loss compensation module, a signal modulation module, a multiplexing and coupling module, and a protocol conversion module;

[0061] The physical communication module is composed of a communication computer, an optical-electric converter, a pump light source, a multiplexing coupler, a single-mode optical fiber, an environment collector, and a scattering compensator, constituting the physical medium part of the digital optical fiber communication system. The environment collector and the scattering compensator are used to reduce the signal loss of optical fiber communication and avoid the influence of the external environment on the communication signal. The communication optical wavelength range adopted by the single-mode optical fiber is 800nm - 1550nm;

[0062] The physical communication module includes: an optical-electric conversion unit, a pump light source unit, and a digital optical fiber unit;

[0063] The optical-electric conversion unit is used to provide a two-way conversion channel between digital signals and optical signals suitable for transmission in optical fibers;

[0064] The pump light source unit is used to activate the pump light source according to the input command signal and emit communication light into the optical fiber;

[0065] The digital optical fiber unit is used to receive and compile digital signals, transmit communication optical signals, and compensate for the scattering loss of communication light in the single-mode optical fiber.

[0066] The loss compensation module is used to calculate the SBS, SRS, and four-wave mixing losses inside the optical fiber according to the optical fiber parameters and the environment collector parameters at the energy carrier frequency latched by the current computer, determine the compensation amount of the scattering compensator for the carrier phase gain from the total loss, and output the functional relationship between the compensation amount and the energy carrier frequency;

[0067] The loss compensation module includes: a carrier frequency loss unit and a compensation gain unit;

[0068] The carrier frequency loss unit is used to calculate the stimulated Brillouin scattering, stimulated Raman scattering, and four-wave mixing losses in the optical fiber according to the parameters of the optical fiber and the frequency of the energy carrier;

[0069] [[ID=z32]]The compensation gain unit is used to calculate the total loss with the frequency of the energy carrier as the independent variable and output a loss compensation function.

[0070] The signal modulation module is used to compile the digital signal transmitted by the communication computer into an optical signal emitted by the pump light source, determine the frequency and length of the signal carrier according to the historical loss feedback, the frequency of the energy carrier, and the information volume of the source information, perform a frequency-domain transformation on the current signal carrier and the energy carrier, and superimpose a cyclic verification signal on the signal carrier so that the superimposed current signal carrier and energy carrier have a minimum gain compensation amount;

[0071] The signal modulation module includes: a digital signal unit, a loss feedback unit, and a multiplexing transformation unit;

[0072] The digital signal unit is used to obtain the digital signal transmitted by the source device and convert the digital signal into a control signal for the light source;

[0073] The loss feedback unit is used to determine the frequency and length of the signal carrier and the energy carrier so that the total loss of the superimposed signal is minimized;

[0074] The multiplexing transformation unit is used to integrate the signal carrier and the energy carrier with the cyclic verification signal to generate a wavelength-division multiplexing signal.

[0075] The multiplexing coupling module is used to couple the transformed signal carrier and energy carrier into a wavelength-division multiplexing signal by using a multiplexing coupler, calculate the compensation amount of the carrier phase gain according to the frequency of the energy carrier corresponding to the wavelength-division multiplexing signal, perform phase modulation on the wavelength-division multiplexing signal, and the phase-modulated wavelength-division multiplexing signal generates a communication optical wave through the light source and is transmitted through a single-mode optical fiber;

[0076] The multiplexing coupling module includes: a wavelength-division phase modulation unit and a gain output unit;

[0077] The wavelength-division phase modulation unit is used to couple and modulate the wavelength-division multiplexing signal and perform phase modulation on the wavelength-division multiplexing signal according to the compensation amount of the carrier phase gain;

[0078] The gain output unit is used to add a verification pulse related to the cyclic verification signal after the multiplexing signal, activate the pump light source, and excite the communication light of the wavelength-division multiplexing signal in the optical fiber.

[0079] The protocol conversion module is used to perform detection on the wavelength-division multiplexing signal with the cyclic verification signal after the destination device receives the wavelength-division multiplexing signal, obtain the frequency of the signal carrier, so as to separate it from the energy carrier frequency, calculate the transmission rate of the signal in real time, and return a protocol change signal when the transmission rate and the bit error rate are lower than the threshold, and change the frequency of the energy carrier and the communication protocol of the signal carrier.

[0080] The protocol conversion module includes: a compilation detection unit and a transmission inspection unit;

[0081] The compilation and detection unit is used to convert communication light into a wavelength division multiplexing signal and a verification pulse in the destination device, and detect and demultiplex the loop verification signal and the signal carrier by frequency division;

[0082] The transmission inspection unit is used to calculate the transmission rate and bit error rate of the signal carrier, and adjust the communication parameters and communication protocols in the optical fiber according to the calculation results.

[0083] As Figure 2 shown, an optimization method for underground tunnel optical fiber communication based on big data includes the following steps:

[0084] Step S1. Construct a physical transmission medium from a single-mode optical fiber transmission device, a communication computer, an environment collector, and a scattering compensator. The computer of the source device receives a digital signal and compiles it into a signal carrier for controlling a pump light source;

[0085] Step S1 includes:

[0086] Step S11. Construct a physical transmission medium from a single-mode optical fiber transmission device, a communication computer, an environment collector, and a scattering compensator. The environment collector and the scattering compensator are used to reduce the signal loss of optical fiber communication and avoid the influence of the external environment on the communication signal. The single-mode optical fiber transmission device includes: an optical-electric converter, a pump light source, a multiplexing coupler, and a single-mode optical fiber. The communication optical wavelength range adopted by the single-mode optical fiber is 800nm - 1550nm;

[0087] Step S12. The source device converts the digital signal to be transmitted into a signal carrier according to a modulation protocol, so that the signal carrier can drive the pump light source to emit an optical signal consistent with the signal carrier. The modulation protocols include: binary modulation protocol, multi-level modulation protocol, external modulation protocol, and extinction method modulation protocol.

[0088] Step S2. Calculate the stimulated Brillouin scattering, stimulated Raman scattering, and four-wave mixing loss in the optical fiber according to the parameters of the optical fiber and the frequency of the energy carrier, accumulate the total loss with the frequency of the energy carrier as the independent variable, and output a loss compensation function;

[0089] Step S2 includes:

[0090] Step S21. Obtain the parameters of the optical fiber, including: optical fiber length, core radius, material optical conductivity, and refractive index, and calculate the total loss according to the following formula:

[0091]

[0092] where γ represents the wavelength of the energy carrier, P(γ) is the total transmission loss function of the optical fiber, P SBS 、P SRS and P SWMrespectively represent stimulated Brillouin scattering, stimulated Raman scattering, and four-wave mixing loss, G is the threshold gain coefficient, A eff is the effective cross-sectional area of the optical fiber, L eff is the effective length of the optical fiber, n B and n R respectively represent the Brillouin gain coefficient and Raman gain coefficient of the optical fiber, P is the power of the energy carrier, D γ is the dispersion coefficient of the energy carrier at wavelength γ;

[0093] Step S22. Input different energy carrier wavelengths pre-loaded in the computer into the total loss function P(γ) to obtain the losses of optical fiber transmission under different frequencies of energy carriers. Select t energy carriers closest to the signal carrier frequency, and use the energy carrier frequency with the minimum loss as the signal transmission frequency, where t is a preset parameter.

[0094] Step S3. Determine the frequency and length of the signal carrier according to the loss compensation function, the frequency of the energy carrier, and the information amount of the source information. Superimpose a cyclic verification signal on the signal carrier to minimize the total loss after multiplexing the signal carrier and the energy carrier;

[0095] Step S3 includes:

[0096] Step S31. Determine the modulation frequency of the signal carrier to minimize the total loss of the superimposed signal, and list the superimposed signal equation:

[0097]

[0098] where Q(t)=a·sin(γ1·t)+b·cos(γ1·t), Q(t) is the cyclic verification signal, a and b are verification coefficients, γ1 is the preset verification frequency, γ e is the signal transmission frequency of the energy carrier, E(t) is the signal carrier, * is the convolution symbol, γ L is the wavelength with the minimum loss, representing the value of the independent variable when P(γ) takes the minimum value within the range of [γ e -γ1, γ e +γ1];

[0099] Step S32. Adjust the values of the verification coefficients a and b to make the superimposed signal equation hold, and convert the values of a and b into binary pulse signals as the verification pulses for the current transmission process.

[0100] Step S4. Perform a frequency-domain transformation on the current signal carrier and energy carrier, couple them into a wavelength-division multiplexed signal, phase-modulate the wavelength-division multiplexed signal according to the compensation amount of the carrier phase gain, and add verification pulses related to the cyclic verification signal after the multiplexed signal;

[0101] Step S4 includes:

[0102] Step S41. Use a multiplexing coupler to perform frequency-domain transformation and integration on the signal carrier and the energy carrier, and couple the wavelength-division multiplexed signal R(t). A decoupling capacitor is configured in the multiplexing coupler, and the decoupling capacitor is directly connected across the decoupling power supply and the ground wire;

[0103] Step S42. Phase-modulate the wavelength-division multiplexed signal according to the standard phase modulation process, so that the cross-modulation phase suppresses the watt-level energy light in the single-mode optical fiber. Add a verification pulse after the phase-modulated wavelength-division multiplexed signal, and input it into the single-mode optical fiber for signal transmission.

[0104] Step S5. The destination device receives the optical signal, converts it into a wavelength-division multiplexed signal and a verification pulse, obtains a cyclic verification signal by frequency division detection according to the verification pulse, separates the signal carrier, calculates the transmission rate and the bit error rate according to the information volume and information loss of the signal carrier, and adjusts the optical fiber communication parameters and communication protocols according to the calculation results.

[0105] Step S5 includes:

[0106] Step S51. The destination device obtains the optical signal, restores the wavelength-division multiplexed signal and the verification pulse through an optoelectronic converter, generates a cyclic verification signal according to the verification pulse, decouples the wavelength-division multiplexed signal by using the cyclic verification signal and the preloaded frequency of the energy carrier, and restores the signal carrier by frequency division detection;

[0107] Step S52. Recover the decoupled energy carrier signal, compare it with the standard energy carrier to obtain the bit error rate of the energy carrier. After restoring the signal carrier to a digital signal, divide the information volume of the digital signal by the transmission duration to obtain the signal transmission rate. When the bit error rate is higher than the threshold or the signal transmission rate is lower than the threshold, the destination device sends an adjustment request to the source device to change the communication parameters and communication protocols.

[0108] Embodiment: Connect a fiber optic link with 60 dB attenuation between the transmitting end and the receiving end devices. The transmitting end sends 0xAA to the receiving end at a baud rate of 1 Mbps, and the receiving end sends 0xBB to the transmitting end at a baud rate of 1 Mbps. They transmit in both directions and work in full duplex. After calculating the loss, select a light source signal with an energy carrier frequency of 20 MHz. Add cyclic verification signals with verification coefficients of 600 and 800 respectively in the source device, and couple the energy carrier, the signal carrier and the cyclic verification signal into a wavelength-division multiplexed signal for bidirectional transmission to achieve dynamic carrier regulation.

[0109] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device.

[0110] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for optimizing underground tunnel optical fiber communication based on big data, characterized in that: The method comprises the following steps: Step S1. A physical transmission medium is constructed by a single-mode optical fiber transmission device, a communication computer, an environmental collector, and a scattering compensator. The computer of the source device receives the digital signal and compiles it into a signal carrier to control the pump light source. Step S2. Calculate stimulated Brillouin scattering, stimulated Raman scattering, and four-wave mixing losses in the optical fiber based on the optical fiber parameters and the frequency of the energy carrier, accumulate the total losses with the frequency of the energy carrier as the independent variable, and output a loss compensation function; Step S3. Determine the frequency and length of the signal carrier according to the loss compensation function, the frequency of the energy carrier, and the amount of information in the source information, and superimpose the cyclic verification signal on the signal carrier to minimize the total loss after multiplexing the signal carrier and the energy carrier; Step S4. Perform frequency domain transformation on the current signal carrier and the energy carrier, couple them into a wavelength division multiplexing signal, phase-modulate the wavelength division multiplexing signal according to the compensation amount of the carrier phase gain, and add a verification pulse related to the cyclic verification signal after the multiplexed signal; Step S5. Use the destination device to receive the optical signal, convert it into a wavelength division multiplexing signal and a verification pulse, obtain a cyclic verification signal based on the verification pulse using the frequency division detection method, separate the signal carrier, calculate the transmission rate and bit error rate based on the information content and information loss of the signal carrier, and adjust the optical fiber communication parameters and communication protocol according to the calculation results.

2. The method for optimizing underground tunnel optical fiber communication based on big data according to claim 1, characterized in that: Step S1 includes: Step S11. Constructing a physical transmission medium using a single-mode optical fiber transmission device, a communication computer, an environmental collector, and a scattering compensator. The environmental collector and scattering compensator are used to reduce signal loss in optical fiber communication. The single-mode optical fiber transmission device includes an optical-to-electrical converter, a pump light source, a multiplexing coupler, and a single-mode optical fiber. The communication light wavelength used by the single-mode optical fiber is in the range of 800 nm to 1550 nm. Step S12. The signal source device converts the digital signal to be transmitted into a signal carrier according to a modulation protocol. The signal carrier can drive the pump light source to emit an optical signal consistent with the signal carrier. The modulation protocol includes: binary modulation protocol, multi-level modulation protocol, external modulation protocol and extinction modulation protocol.

3. The method for optimizing underground tunnel optical fiber communication based on big data according to claim 2, characterized in that: Step S2 includes: Step S21. Obtain the parameters of the optical fiber, including: optical fiber length, core radius, material light guide coefficient and refractive index, and calculate the total loss according to the following formula: Where γ represents the wavelength of the energy carrier, P(γ) is the total transmission loss function of the optical fiber, and P SBS 、P SRS and P SWM represent stimulated Brillouin scattering, stimulated Raman scattering and four-wave mixing loss respectively, G is the threshold gain coefficient, A is the threshold gain coefficient, eff is the effective cross-sectional area of the optical fiber, L eff is the effective length of the optical fiber, n B and n R They represent the Brillouin gain coefficient and Raman gain coefficient of the optical fiber, P is the power of the energy carrier, and D γ is the dispersion coefficient of the energy carrier of wavelength γ; Step S22. Input different energy carrier wavelengths preloaded in the computer into the total loss function P(γ) to obtain the loss of optical fiber transmission under energy carriers of different frequencies. Select t energy carriers closest to the signal carrier frequency, and use the energy carrier frequency with the smallest loss as the signal transmission frequency. t is a preset parameter.

4. The method for optimizing underground tunnel optical fiber communication based on big data according to claim 3, characterized in that: Step S3 includes: Step S31. Determine the modulation frequency of the signal carrier to minimize the total loss of the superimposed signal and list the superimposed signal equation: Among them, Q(t)=a·sin(γ1·t)+b·cos(γ1·t), Q(t) is the cyclic verification signal, a and b are verification coefficients, γ1 is the preset verification frequency, γ e is the signal transmission frequency of the energy carrier, E(t) is the signal carrier, * is the convolution symbol, γ L is the minimum loss wavelength, which means P(γ) in [γ e -γ1,γ e +γ1] when the independent variable takes the minimum value; Step S32. Adjust the values of verification coefficients a and b so that the superposition signal equation is valid, and convert the values of a and b into binary pulse signals as verification pulses for the current transmission process.

5. The method for optimizing underground tunnel optical fiber communication based on big data according to claim 4, characterized in that: Step S4 includes: Step S41. Using a multiplexing coupler, frequency domain conversion and integration are performed on the signal carrier and the energy carrier to couple the wavelength division multiplexed signal R(t). The multiplexing coupler is configured with a decoupling capacitor, which is directly connected between the decoupling power supply and the ground line. Step S42. Phase-modulate the wavelength division multiplexing signal according to the standard phase modulation process to suppress the watt-level energy light in the single-mode fiber. Add a verification pulse after the phase-modulated wavelength division multiplexing signal and input it into the single-mode fiber for signal transmission; Step S5 includes: Step S51. Acquire an optical signal using a sink device, restore the wavelength division multiplexing signal and verification pulse using an optoelectronic converter, generate a cyclic verification signal based on the verification pulse, decouple the wavelength division multiplexing signal using the preload frequency of the cyclic verification signal and the energy carrier, and restore the signal carrier using frequency division detection. Step S52. Recover the decoupled energy carrier signal and compare it with the standard energy carrier to obtain the bit error rate of the energy carrier. After restoring the signal carrier to a digital signal, divide the information volume of the digital signal by the transmission duration to obtain the signal transmission rate. When the bit error rate is higher than the threshold or the signal transmission rate is lower than the threshold, the sink device sends an adjustment request to the source device to change the communication parameters and communication protocol.

6. An underground tunnel optical fiber communication optimization system based on big data, characterized in that: The system includes the following modules: a physical communication module, a loss compensation module, a signal modulation module, a multiplexing coupling module and a protocol conversion module; The physical communication module consists of a communication computer, a photoelectric converter, a pump light source, a multiplexing coupler, a single-mode optical fiber, an environmental collector, and a scattering compensator, forming the physical medium part of the digital optical fiber communication system. The environmental collector and scattering compensator are used to reduce the signal loss of optical fiber communication and avoid the influence of the external environment on the communication signal. The communication light wavelength range used by the single-mode optical fiber is 800nm-1550nm; The loss compensation module is used to calculate the SBS, SRS and four-wave mixing losses inside the optical fiber according to the optical fiber parameters and the environmental collector parameters at the energy carrier frequency currently locked by the computer, determine the compensation amount of the dispersion compensator for the carrier phase gain based on the total loss, and output the functional relationship between the compensation amount and the energy carrier frequency; The signal modulation module is used to compile the digital signal transmitted by the communication computer into an optical signal emitted by the pump light source, determine the frequency and length of the signal carrier according to the historical loss feedback, the frequency of the energy carrier and the amount of information of the source information, perform frequency domain transformation on the current signal carrier and the energy carrier, and superimpose a cyclic verification signal on the signal carrier so that the current signal carrier and the energy carrier have the minimum gain compensation amount after superposition; The multiplexing coupling module is used to couple the converted signal carrier and energy carrier into a wavelength division multiplexing signal using a multiplexing coupler, calculate the compensation amount of the carrier phase gain according to the frequency of the wavelength division multiplexing signal corresponding to the energy carrier, and phase-modulate the wavelength division multiplexing signal. The wavelength division multiplexing signal after phase modulation generates a communication light wave through a light source, and the signal is transmitted through a single-mode optical fiber; The protocol conversion module is used to detect the wavelength division multiplexing signal with a cyclic verification signal after the destination device receives it, obtain the frequency of the signal carrier, and thus separate it from the energy carrier frequency, calculate the signal transmission rate in real time, and return the protocol change signal when the transmission rate and bit error rate are lower than the threshold, thereby changing the frequency of the energy carrier and the communication protocol of the signal carrier.

7. The underground tunnel optical fiber communication optimization system based on big data according to claim 6, characterized in that: The physical communication module includes: a photoelectric conversion unit, a pump light source unit and a digital optical fiber unit; The photoelectric conversion unit is used to provide a bidirectional conversion channel between digital signals and optical signals suitable for transmission in optical fibers; The pump light source unit is used to activate the pump light source according to the input command signal to emit communication light into the optical fiber; The digital optical fiber unit is used to receive and compile digital signals, transmit communication optical signals, and compensate for scattering losses of communication light in a single-mode optical fiber.

8. The underground tunnel optical fiber communication optimization system based on big data according to claim 7, characterized in that: The loss compensation module includes: a carrier frequency loss unit and a compensation gain unit; The carrier frequency loss unit is used to calculate stimulated Brillouin scattering, stimulated Raman scattering and four-wave mixing losses in the optical fiber according to the parameters of the optical fiber and the frequency of the energy carrier; The compensation gain unit is used to calculate the total loss with the frequency of the energy carrier as an independent variable and output a loss compensation function.

9. The underground tunnel optical fiber communication optimization system based on big data according to claim 8, characterized in that: The signal modulation module includes: a digital signal unit, a loss feedback unit and a multiplexing conversion unit; The digital signal unit is used to obtain the digital signal transmitted by the source device and convert the digital signal into a control signal for the light source; The loss feedback unit is used to determine the frequency and length of the signal carrier and the energy carrier so as to minimize the total loss of the superimposed signal; The multiplexing conversion unit is used to integrate the signal carrier and the energy carrier using the cyclic verification signal to generate a wavelength division multiplexing signal.

10. The underground tunnel optical fiber communication optimization system based on big data according to claim 9, characterized in that: The protocol conversion module includes: a compilation detection unit and a transmission verification unit; The compilation and detection unit is used to convert the communication light into a wavelength division multiplexing signal and a verification pulse in the sink device, and use frequency division detection to output a cyclic verification signal and a signal carrier; The transmission verification unit is used to calculate the transmission rate and bit error rate of the signal carrier, and adjust the communication parameters and communication protocol in the optical fiber according to the calculation results.

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