129 results about "Dispersion compensation" patented technology

The invention discloses a terahertz phased array secondary sub-array sub-band dispersion compensation design method. The method comprises the following steps: step 1, constructing a terahertz phased array system primary sub-array unit and a sub-band bandwidth; step 2, constructing a quadratic subarray and sub-band decision variable constraint condition; step 3, constructing a quadratic subarray and a digital sub-band decision variable group; 4, phased array beam quality optimization target parameters are determined according to terahertz phased array application requirements; step 5, carrying out joint optimization solution on the secondary sub-array and the sub-banding topological structure; and step 6, optimal phase compensation parameter set calculation and compensation processing are carried out. Compared with the existing uniform division or single compensation mode, the subarray and the subband are smaller in scale, the spatial three-dimensional layout is easier to realize, the time dispersion and the spatial dispersion of the broadband large-scale terahertz phased array system are eliminated to a certain extent, and the accurate high-quality direction of the terahertz wave beam is realized.

The invention belongs to the technical field of temperature demodulation, and particularly relates to a temperature measurement method and device based on machine learning and a storage medium, and the method comprises the steps: converting the temperature change into the wavelength shift of an interference spectrum through an interference type optical fiber temperature sensor; performing time domain stretching on the wavelength offset by using the dispersion compensation optical fiber to obtain time sequence offset; the method comprises the following steps: acquiring time sequence offset through signal acquisition equipment to obtain time domain sequence data, and preprocessing the time domain sequence data; position coding is adopted to obtain a feature sequence containing time sequence information; inputting the feature sequence into a Transform neural network to extract global features; normalizing the global features and then enhancing the global features; and mapping the enhanced features through a full connection layer of the Transform neural network, and outputting a predicted temperature value. And high-speed and high-precision temperature prediction is realized.

The invention provides an all-polarization-maintaining optical fiber mode-locked laser which comprises a linear cavity and an annular cavity. Wherein the annular cavity consists of a wavelength division multiplexer, an optical fiber coupler, a phase bias device, a gain optical fiber and a dispersion compensation optical fiber; the linear cavity is composed of an optical fiber coupler and an optical fiber reflector. As a function multiplexing device, an external electric field is applied to the phase bias device, so that the functions of continuous tuning of the phase difference in the positive direction and the negative direction in the annular cavity of the 9-shaped cavity mode-locked fiber laser and rapid phase tuning are realized, and the realization of a mode-locked state and a high-precision phase locking state is promoted. In addition, the composition structure of the resonant cavity can be simplified, and the repetition frequency and the system stability of the mode-locked laser can be improved. The technology for constructing the 9-shaped cavity mode-locked fiber laser by adopting the active phase bias device has originality in the field of ultrafast optics, and a better choice is provided for the all-polarization-maintaining fiber mode-locked laser.

In one embodiment, an optical transceiver includes a digital signal processor, a transmitter coupled to the digital signal processor, and a receiver coupled to the digital signal processor. The receiver is configured to receive an optical signal. The receiver includes a demultiplexer for optical demultiplexing of the optical signal into a plurality of channels, and a plurality of dispersion management devices. Each of the dispersion management devices is associated with a respective channel of the plurality of channels of the demultiplexer and is configured for dispersion compensation at the respective channel. Each of the dispersion management devices includes a thermal control component configured to thermally adjust the dispersion compensation by the dispersion management device based on an output of the digital signal processor.

The invention relates to the technical field of digital-to-analog conversion, in particular to a large-dispersion compact chirped pulse time domain compression method, which comprises the following steps of: projecting a broadened chirped pulse to a first grating in an inclined incidence mode, and moving adjacent back and forth diffraction spots point by point in a direction parallel to a grating scribed line; the first grating and the second grating are oppositely arranged in parallel to form a double-grating group; controlling the chirped pulse to perform multiple back-and-forth diffraction between the first grating and the second grating to obtain a preset large dispersion amount; an angular dispersion steering module is arranged on a back-and-forth diffraction light path of the chirped pulse, and vertical angular dispersion introduced due to oblique incidence is turned into horizontal angular dispersion. An angular dispersion compensation module is arranged on a light path before the chirped pulse is output, and the angular dispersion accumulated by multiple back-and-forth diffraction is offset and compensated. According to the method, on one hand, the dispersion amount several times that of a traditional pulse time domain compressor can be obtained, on the other hand, the compact design of the structure of the compressor can be achieved, and the method has important engineering application value.

The application belongs to the technical field of temperature demodulation, and particularly relates to a temperature measuring method and device based on machine learning and a storage medium, the method comprising: converting temperature changes into wavelength shifts of an interference spectrum by an interference optical fiber temperature sensor; stretching the wavelength shifts in the time domain by using a dispersion compensation optical fiber to obtain time sequence shifts; collecting the time sequence shifts by a signal acquisition device to obtain time domain sequence data, and preprocessing the time domain sequence data; obtaining a feature sequence containing time sequence information by using position coding; inputting the feature sequence into a Transform neural network to extract global features; enhancing the global features after normalization; and mapping the enhanced features by a full connection layer of the Transform neural network to output a predicted temperature value. High-speed and high-precision temperature prediction is realized.

The invention discloses a disc Mmyshev mode-locked laser, and belongs to the technical field of ultrafast laser. The disc Mmyshev mode-locked laser comprises a laser gain module, a first nonlinear medium, a second nonlinear medium, a first interference filter, a second interference filter, a dispersion compensation module, an output coupling mirror, a first concave reflecting mirror, a second concave reflecting mirror, a high reflecting mirror, a third concave reflecting mirror and a fourth concave reflecting mirror. According to the disc Mmyshev mode-locked laser, a Mmyshev filtering mechanism is introduced into the disc Mmyshev mode-locked laser, and mode-locked self-starting and ultra-short pulse output under the condition of high average power are achieved. The disc Mmyshev mode-locked laser does not need an SESAM or Kerr mode-locked medium, can obtain stable ultrashort pulses smaller than 100 femtoseconds, has high stability, self-starting, good beam quality and structural expandability, and is suitable for application fields such as precise micromachining and extreme ultraviolet lithography driving sources.

The invention discloses an automatic configuration method for optical path subsystem design, and relates to the technical field of optical communication transmission, and the method comprises the steps: inputting configuration parameters required by an optical path subsystem to be designed, and summarizing and outputting a first configuration table which comprises the optical cable lengths, average attenuation, optical cable types, protection modes and transmission rates of all optical path sections; data resource analysis is carried out on the table based on the AI learning technology, and an optical path configuration scheme of optical amplification board card combination and dispersion compensation under different transmission rates is given; and performing multi-layer verification on the optical path configuration scheme, and outputting an optimal configuration scheme. According to the method, on the basis of the AI calculation and automation technology, corresponding configuration is provided for different optical path conditions under the condition that a machine continuously learns configuration, and the four technical values of efficiency improvement, accuracy controllability, cost optimization and standard unification are achieved.

The present application discloses a fiber optic sensor and a measurement method, apparatus, and storage medium. By performing, based on the microwave signal, intensity modulation on the optical signal, then inputting the modulated optical signal into the fiber optic containing the weak reflection grating array, a reflected signal is obtained. Thereafter by performing dispersion compensation on the amplified partial reflected signal, and based on the dispersion-compensated reflected signal and the non-dispersion-compensated reflected signal, the change amounts respectively corresponding to positions in the fiber optic containing the weak reflection grating array are determined.

In one embodiment, a method for dispersion compensation by an optical transceiver includes: receiving an output from a digital signal processor of the optical transceiver; determining a difference between the received output and an initial target output; based on determining that the difference between the received output and the initial target output exceeds a threshold, tuning a temperature of a dispersion management device of the optical transceiver across a first temperature range; identifying an adjusted target output based on the temperature tuning across the first temperature range; and adjusting the temperature of the dispersion management device to an adjusted target temperature corresponding to the adjusted target output.

The present disclosure provides a communication radar integrated optical fiber remote system and a phase locking method. A remote antenna unit is configured to receive a reflected microwave signal, and modulate the amplitude of the microwave signal to obtain an initial optical carrier signal. A dispersion compensation unit is connected with the remote antenna unit and configured to perform dispersion compensation on the initial optical carrier signal to obtain an optical carrier signal. A central unit is connected with the dispersion compensation unit and configured to perform phase locking using the received optical carrier signal to obtain an output optical signal. The frequency of the output optical signal is the same as that of the optical carrier signal, and the phase of the output optical signal is the same as that of the optical carrier signal. A signal output unit is connected with the central unit and configured to output the output optical signal. The present disclosure realizes the consistency of the frequency and the phase synchronization of the output optical signal and the optical carrier signal, realizes low phase noise carrier recovery, and improves the communication and radar performance.

An off-axis single-grating multi-pass pulse compressor disclosed by the present invention comprises a compression module and at least one group of mirror groups, the mirror groups are used for increasing dispersion compensation of the compression module, and the compression module comprises a D-shaped reflector, a grating, a plane reflector, a first horizontal mirror and a first high-low mirror. Each group of mirror group comprises two mirrors, one mirror of each group of mirror group is located at the laser output end of the compression module, and the other mirror of each group of mirror group is located above the first high-low mirror, or the other mirror of each group of mirror group is located above the second high-low mirror. And the other mirror of each mirror group is positioned on one side of the first high-low mirror and has the same height with the horizontal plane. According to the off-axis single-grating multi-pass pulse compressor, a multi-pass single-grating compressor can be achieved, the total dispersion compensation amount is greatly increased, the advantages of low cost and small size of a transmission-type single-grating compressor can be reserved, and the compression requirement of ultra-large chirped pulses can be met.

The invention discloses an optical fiber nonlinear compensation method and device, equipment, a storage medium and a product. The method comprises the following steps: after carrier phase recovery and before forward error correction decoding are carried out on a signal transmitted by an optical fiber, DBP nonlinear compensation is carried out on the signal; wherein the signal is subjected to optical fiber dispersion compensation before clock synchronization, and the DBP nonlinear compensation comprises the following steps: adding optical fiber dispersion to simulate a reverse transmission condition, and performing segmented compensation on the optical fiber dispersion and nonlinearity based on SSFM. Due to the fact that the DBP nonlinear compensation is carried out after the carrier phase is recovered, the DBP nonlinear compensation can be carried out on the signals with the performance converged and stable, the accuracy and stability of compensation can be improved, in addition, single sampling of the signals after the carrier phase is recovered is recovered, and the complexity of the DBP nonlinear compensation can be effectively reduced.

An aspect of the present invention is an estimation device including: a control unit that estimates a vibration position that is a position on an optical fiber where vibration is induced by vibration of an external environment based on a reception signal that is a result of propagation of a transmission signal that is an optical signal transmitted by a transmitter through the optical fiber, in which the control unit executes estimation processing including: compensation processing including wavelength dispersion compensation processing of compensating for wavelength dispersion with respect to the reception signal, transmission signal estimation processing of estimating the transmission signal based on a result of the wavelength dispersion compensation processing, wavelength dispersion reapplication processing of reapplying the wavelength dispersion to a result of the compensation processing, and vibration position estimation processing of estimating the vibration position based on a result of inverse mapping of mapping according to the vibration position, the mapping representing a change in the transmission signal due to propagation through the optical fiber, acting on a result of the wavelength dispersion reapplication processing and a result of the transmission signal estimation processing.

This disclosure generally relates to an optical coherence tomography (OCT) system. This disclosure particularly relates to an OCT system with a multi-pass dispersion compensation cell incorporated into its reference arm. This disclosure further relates to a hand-held compact OCT system suitable for inspection of an ear of a mammal.

Disclosed in the present application are a dispersion compensation device and a dispersion compensation method. The dispersion compensation device at least comprises a first compensation element and a second compensation element, wherein each compensation element comprises a refractive interface and a reflective interface. A light beam to be subjected to compensation propagates between the compensation elements in a normal-incidence / normal-exit propagation mode on the basis of the refractive interfaces, and the propagation direction and incidence and exit positions of said light beam within the compensation elements are changed on the basis of the reflective interfaces, such that said light beam exits from the at least two compensation elements after undergoing at least two rounds of reflection between the first compensation element and the second compensation element. In the dispersion compensation device provided in the present application, a normal-incidence / normal-exit mode is used such that a light beam to be subjected to compensation propagates between compensation elements without introducing dispersion, and multiple rounds of reflection are performed by means of a first compensation element and a second compensation element that are arranged opposite each other and staggered, thereby achieving a high degree of dispersion compensation on the basis of a relatively simple optical structure.

The invention discloses a 2-micron short-period laser amplifier based on a thulium-doped positive dispersion fluorotellurite optical fiber, which can solve the problem that a negative dispersion thulium-doped optical fiber is not suitable for performing gain management nonlinear amplification on a 2-micron pulse, and can obtain a pulse width lt. 50 fs, and single pulse energy gt; the femtosecond laser output device has the advantages of being full-fibrillated and compact in structure. The 2-micron femtosecond seed source is femtosecond pulse laser of a 2-micron wave band generated based on nonlinear amplification loop mirror mode locking; the chirped pulse amplifier is used for obtaining sub-picosecond 1.9 mu m femtosecond laser output with the average power greater than or equal to 1W; the optical fiber GMN amplifier is used for obtaining a few-period femtosecond pulse; the high-power optical fiber pulse compressor is a hollow-core optical fiber and is used for carrying out accurate dispersion compensation and high-quality pulse compression.

A diaphragm-type optical fiber micro-vibration measurement apparatus and method based on a single-pass band microwave photonic filter. The apparatus comprises a broadband light source module (1), a three-port circulator (2), an AU diaphragm optical fiber micro-vibration sensor (3), an erbium-doped optical fiber amplifier (4), a polarization controller (5), an electro-optical modulator (6), a power supply module (7), a radio-frequency source module (8), a dispersion compensation optical fiber (9), a photoelectric detector (10), a data acquisition card (11) and a computer (12), wherein the broadband light source module (1) is connected to one port of the three-port circulator (2) by means of an optical fiber connection line.

A method is performed by a system comprising an optical transmitter and an optical receiver coupled by an optical transmission medium. The optical receiver comprises a plurality of chromatic dispersion compensation (CDC) circuitry stages. The method comprises, in the optical transmitter: determining an amount of data to be transmitted over the optical transmission medium to the optical receiver; using the amount of data to set a bit repetition factor; encoding data into a sequence of bits, in which each bit is repeated a number of times based on the bit repetition factor; and transmitting, to the optical receiver over the optical transmission medium, an optical transmission comprising the sequence of bits. The method further comprises, in the optical receiver: receiving the optical transmission; determining a number of the plurality of CDC circuitry stages to be applied to the optical transmission; and applying the determined number of CDC circuitry stages to the optical transmission. The disclosure also provides apparatus and further methods in an optical transmitter and an optical receiver.

The invention belongs to the technical field of digital signal processing, and particularly relates to a low-complexity segmented filtering method based on a bilateral overlap-save method in a broadband communication system. Aiming at the problem of realizing a large-scale finite impulse response filter in a hardware platform with a limited Fourier transform size, the method comprises the following steps of: dividing a long filter into a plurality of sub-segments and respectively performing frequency domain representation; the method comprises the following steps: performing bilateral overlapping storage on input signal blocks, performing fast Fourier transform, introducing phase shift in a frequency domain to realize time shift, further accumulating frequency domain product results of each filter section and a signal block, and finally obtaining filtering output only through one-time inverse fast Fourier transform. According to the method, the inverse fast Fourier transform operation times are remarkably reduced, the calculation complexity and the storage requirement are greatly reduced, the filtering performance is kept, meanwhile, excellent hardware friendliness is achieved, and the method is particularly suitable for occasions needing an ultra-long filter, such as optical fiber communication dispersion compensation processing.

The application discloses a kind of discrete dispersion compensation devices based on multi-channel micro-ring.The upstream waveguide and the downstream waveguide are arranged in parallel and are spaced apart, there are multi-channel parallel micro-ring components between the upstream waveguide and the downstream waveguide, including n micro-rings arranged in the direction of waveguide, there is a delay line on the upstream waveguide between the adjacent two micro-rings, so that different micro-rings adapt different wavelength optical signals;The dispersion compensation signal to be input into the upstream waveguide, is coupled and transmitted into the downstream waveguide through each micro-ring in the multi-channel parallel micro-ring component, is divided into n discrete wavelength signals through n micro-rings, and finally is output after being combined by wavelength division multiplexing in the downstream waveguide.The application combines micro-ring wavelength division multiplexing device and compact delay line, forms on-chip discrete dispersion compensation device, realizes multi-channel, large time delay and low time delay jitter high-performance integrated on-chip dispersion compensation device, can reduce the influence of dispersion on communication system, reduce spectral broadening and distortion, reduce the bit error rate of transmission signal.

In one embodiment, an optical transceiver includes a digital signal processor, a transmitter coupled to the digital signal processor, and a receiver coupled to the digital signal processor, a method for dispersion compensation by the optical transceiver, a computer system, and a storage medium. The receiver is configured to receive an optical signal. The receiver includes a demultiplexer for demultiplexing an optical signal into a plurality of channels and a plurality of dispersion management devices. Each dispersion management device of the plurality of dispersion management devices is associated with a respective channel of the plurality of channels of the demultiplexer and is configured for dispersion compensation at the respective channel. Each dispersion management device includes a thermal control component configured to thermally adjust a dispersion compensation of the dispersion management device based on an output of the digital signal processor.

The invention provides a compact integrated broadband test system, which comprises a TFLN integrated chip module, an optical fiber pumping and modulation module, a terahertz radiation and receiving module and a data acquisition and analysis module, and is characterized in that all the modules are integrated to adapt to 200GHz-3.5 THz terahertz radio communication and radar test requirements; the TFLN integrated chip module comprises a TFLN integrated chip, and a thin film lithium niobate TFLN with the x cutting thickness of 500-700 nm is bonded to a SiO2 / 500 [mu] m high-resistance silicon substrate with the thickness of 4700 nm; the optical fiber pumping and modulation module comprises a mode-locked laser, a dispersion compensation unit, a Mach-Zehnder modulator (MZM) and an erbium-doped optical fiber amplifier (EDFA); the terahertz radiation and receiving module comprises a transmitting link, a receiving link and an optical detection branch; the data acquisition and analysis module comprises a balanced photoelectric detector PD, a data acquisition card and analysis software, the terahertz radio communication and radar test requirements can be subjected to data linkage analysis, the test process is simple, and time is saved.

The invention provides a low-complexity nonlinear compensation method and system for digital subcarrier multiplexing optical communication, and the method comprises the steps: calculating a nonlinear coefficient of a digital subcarrier multiplexing optical communication system, and carrying out the quantization processing of the nonlinear coefficient through employing a uniform quantization mode; by taking the cross-section length as a processing step length, converting the time domain signal of each subcarrier to a frequency domain for dispersion compensation, and then converting the compensated signal back to the time domain; calculating nonlinear phase noise in the subcarriers based on the time domain signal intensity of each subcarrier by taking the cross-section length as a processing step length, and performing phase rotation compensation; and calculating inter-subcarrier nonlinear phase noise and inter-polarization crosstalk based on the quantized nonlinear coefficient, subcarrier signal strength and inter-polarization crosstalk strength by taking the cross-section length as a processing step length, constructing a nonlinear compensation matrix and performing matrix compensation. According to the invention, the calculation complexity of an optical fiber nonlinear compensation algorithm is reduced, and efficient nonlinear compensation of a digital subcarrier multiplexing optical communication system is realized.

The invention provides a grating compression device, a compression method thereof and an optical fiber laser system. The grating compression device, the compression method thereof and the optical fiber laser system have the following beneficial effects that after being diffracted by the grating in the cavity, laser is reflected between mirrors such as the grating in the device to be compressed, and a light beam compressed by the grating can be translated by a certain distance in the vertical direction and is transmitted in the reverse direction through the basic turn-back mirror; the volume of the grating compressor is effectively reduced, and the cost is saved; and the angle between the incident laser and the grating pair and the distance between the grating pairs are adjusted through electric control, so that the device is adaptive to different laser systems, high-precision control of dispersion compensation amount is realized, and introduction of mechanical clearance or angle deviation caused by manual adjustment is avoided.

The present application belongs to the field of ultrafast laser and nonlinear optics, and particularly relates to a near-infrared few-cycle pulse generation system and method based on high-pressure nonlinear enhancement. The method fills inert gas into a hollow-core anti-resonant optical fiber and adjusts the gas pressure to the high-pressure interval of 20 bar-90 bar, enhances the nonlinear coefficient of the gas to realize the dispersion and nonlinear dynamic balance of the pulse in the waveguide, thereby compensating for the insufficient peak power of the low-energy pump pulse. The pulse feedback module collects the output time-domain intensity waveform and extracts the main peak energy proportion and the splitting factor as feedback indexes. The control module diagnoses the offset state of the self-compression focal point relative to the truncated end face according to the feedback indexes, controls the small-step pressure regulation of the gas pressure regulation module to anchor the focal point on the truncated end face, and directly outputs high-quality and high-coherence near-infrared few-cycle pulses without external dispersion compensation devices.

The invention discloses a temperature-insensitive pressure measurement system based on a radio frequency modulation polarization-maintaining fiber grating, polarization-maintaining fiber light senses the pressure, and after the polarization-maintaining fiber light is acted by corresponding external pressure, the central wavelengths of X-polarized light and Y-polarized light are changed; the polarization-maintaining fiber grating transmits the X polarized light and the Y polarized light to the first dispersion compensation fiber and the second dispersion compensation fiber respectively, and performs phase modulation on the X polarized light and the Y polarized light respectively, so as to convert a tiny difference between central wavelengths of the X polarized light and the Y polarized light under the action of external pressure into a remarkable phase difference change between the X polarized light and the Y polarized light; the components of the Y polarized light and the modulated X polarized light in the same direction of the polarization analyzer are subjected to beat frequency and then enter the photoelectric detector to be converted into electric signals; and the frequency spectrograph determines the external pressure on the polarization maintaining fiber grating according to the frequency spectrum drift of the beat frequency signal. When the influence of the environment temperature on pressure measurement is eliminated, the size of a detection part is small, the signal processing method is simple, and the resolution ratio is high.

The utility model provides a dense wavelength division multiplexing transmission system capable of expanding O-band wavelength signals, which comprises a first main circuit and a second main circuit which can mutually transmit optical signals, the first main circuit comprises a first array waveguide grating module, one side of the first array waveguide grating module is in butt joint with a plurality of first main circuit optical modules, and the other side of the first main circuit optical modules is in butt joint with a plurality of second main circuit optical modules. The other side of the first array waveguide grating module is sequentially connected with a first filter and a dispersion compensation module, a first amplifier is further arranged between the first array waveguide grating module and the first filter, one side of the dispersion compensation module is in butt joint with a first expansion port, and the first expansion port is connected with a first expansion branch. Compared with the prior art, the system has the advantages that the C band DWDM optical module is directly adopted in the main line, signal conversion does not depend on the Muxponder, the transmission rate of each channel can be increased to 100 Gbps or above, O band wavelength signals are also combined into the main line for long-distance transmission, and the ever-increasing communication requirements are met.

The invention provides a chaotic optoelectronic oscillator time delay characteristic suppression method based on the synergistic effect of a dispersion effect and a wide-spectrum light source. The laser source generates high-stability continuous optical signals, and the polarization state of the continuous optical signals is adjusted through the polarization controller so as to be matched with a polarization sensitive axis of the Mach-Zehnder modulator. The MZM serves as a nonlinear core device, and intensity modulation is carried out on feedback electric signals through a nonlinear transmission function of the MZM. An optical signal output by the MZM is divided into two paths through a first optical coupler, wherein one path enters a monitoring system and is output as a chaotic signal; and the other path enters a photoelectric feedback loop. In a feedback loop, an optical signal firstly enters an erbium-doped optical fiber amplifier for power compensation so as to offset insertion loss caused by subsequent long-distance optical fibers; and then entering a dispersion link formed by cascading a dispersion compensation optical fiber and a standard single-mode optical fiber. According to the invention, by introducing the dispersion link and utilizing the time delay characteristic related to the frequency, the suppression level is improved by about 22.6 dB, and the confidentiality and randomness of the system are greatly enhanced. The structure is simple and standardized.

The invention belongs to the field of optical fiber communication, and discloses a dispersion simulation transmission link based on analog signal processing and a dispersion simulation method, and the dispersion simulation transmission link comprises a coherent transmitter, an IQ modulator, lasers with different wavelengths, a coherent receiving chip (ICR), a Bragg dispersion compensation grating (FBG-DCM) and a coherent receiver. Data is sent out from a coherent transmitter, firstly passes through an ICR, a light field is converted into an electric field, and the electric field is modulated into a new light field by an IQ modulator. Two paths can be selected at the output end of the ICR, the first path is connected to the IQ modulator and is subjected to secondary emission by utilizing intrinsic light with different wavelengths, the wavelength can be converted to an FBG-DCM compensation window, and after the steps, the ICR is used for receiving and then is converted to the original wavelength by utilizing the IQ modulator to be sent, so that the superposition of negative dispersion is realized; and the second path is connected to the IQ modulator, secondary emission is carried out by utilizing intrinsic light with different wavelengths, phase conjugation is realized, meanwhile, conversion to an FBG-DCM compensation window is realized, and superposition of positive dispersion is realized through the above steps after ICR receiving.