37 results about "Phase sensitive" patented technology

The application provides a phase-sensitive optical time domain reflectometer, a measurement method and a readable storage medium, wherein a signal generation circuit of the phase-sensitive optical time domain reflectometer is configured to generate a radio frequency signal to drive an optical intensity modulator to modulate probe light, so that two groups of frequency division multiplexing sequences with differences can be used to synchronously detect a sensing optical fiber to be measured, a differential unfolding algorithm is combined to accurately solve a phase change amount in adjacent sampling intervals, and then demodulation results corresponding to different frequency parts are respectively unfolded to obtain unfolded phase results, so that the problem of large strain phase folding is solved and a large strain range is recovered, and further, the unfolded phase results are rearranged and combined in time sequence through time sequence interleaving processing of the unfolded phase results, so that a high sampling rate and a distortion-free reconstruction result are reconstructed, and therefore, the application can realize accurate measurement of high frequency response and large strain range dynamic strain.

The application discloses a phase-sensitive pre-amplification method based on an electro-absorption modulated laser, and is applied to a star-ground laser communication system receiving end. A distributed feedback laser in the electro-absorption modulated laser amplifies weak pump light after long distance transmission, and generates idler light under the nonlinear effect of a laser cavity; an electro-absorption modulator in the electro-absorption modulated laser detects phase error information between signal light, pump light and idler light, and constructs an optical injection phase-locked loop through a feedback loop, so that stable control of the three-wave phase relationship is realized. Under the phase stability condition, the output light of the electro-absorption modulated laser is fed into a later-stage nonlinear medium to complete phase-sensitive pre-amplification. The phase-sensitive pre-amplification method based on the electro-absorption modulated laser has the advantages of simple structure and easy integration, can realize pump light amplification, idler light generation and phase error suppression under the condition of weak pump light, and effectively improves the receiving sensitivity performance of the star-ground laser communication system.

The invention discloses a carrier roller fault diagnosis method and system based on coupled vibration analysis, and the method specifically comprises the steps: separating a phase-sensitive optical time domain reflection signal based on a physical parameter of a conveying system, separating the phase-sensitive optical time domain reflection signal into a direct vibration signal and a conveying belt conduction vibration signal, recording the direct vibration signal as a first frequency band signal, and recording the second frequency band signal as a second frequency band signal; recording the conveying belt conduction vibration signal as a second frequency band signal; calculating a feature vector of the first frequency band signal to obtain a first feature vector set; calculating a feature vector of the second frequency band signal to obtain a second feature vector set; and carrying out feature fusion on the first feature vector set and the second feature vector set, and obtaining probability distribution of fault categories based on fused features. According to the method, the physical phenomenon of'conveying belt-carrier roller coupling vibration 'is systematically utilized for the first time, the defects that an existing method is single in dimension and prone to being interfered are overcome through double-channel feature fusion analysis, and the accuracy and robustness of early fault diagnosis of the carrier roller of the long-distance belt conveyor are remarkably improved.

An electromagnetic induction (EMI) system for characterizing geophysical (e.g. subterranean) environments, includes: (a) a transmitter module including a transmission coil and signal transmission electronics; and (b) at least one receiver module including a receiver coil and signal reception electronics wherein the at least one receiver module is physically separated from the transmitter module without a wired signal connection between them, wherein phase information of signals sent by the transmitter module and those received by at least one receiver module are preserved such that phase information of received signals may be determined and used in characterizing the geophysical environment. In some systems, signal preservation uses a pair of correlated, stable, high frequency clocks.

The invention relates to the technical field of light atmosphere, and discloses a light atmosphere effect generation method, which comprises the following steps: generating an initial wave function according to an intensity field, deducing on the basis of a potential energy field to obtain a first wave function, performing intensity calculation and phase extraction from the first wave function to obtain a second wave function, updating the direction field based on the second wave function to obtain an updated direction field and an enhanced optical flow field; three core advantages of light atmosphere generation are realized, firstly, deep coupling of quantum optics and neurocognition is realized, real response of human eyes is simulated through a phase-sensitive light response model, and light atmosphere distribution is enabled to conform to quantum propagation rules and human visual cognition characteristics in combination with a cognition attention focusing mechanism of a DQN model; and 2, a dynamic self-adaptive mechanism runs through the whole process, and a light current coefficient and object motion data are adjusted in real time through the pupil diameter to feed back a new light flow field so as to ensure that the environment change can be quickly responded.

This optical transmission system comprises: a phase conjugate conversion device (200) that performs optical parametric amplification in a first optical parametric amplification unit (238) and in a second optical parametric amplification unit (244), monitors electric power of a first polarized component and a second polarized component of first pilot light, controls the phase of higher harmonic wave excitation light by means of phase shifters (218, 224) so as to maximize the optical power of first pilot light to thereby synchronize the phase of the higher harmonic wave and the first pilot light, and controls a phase shifter (264) disposed in at least one path so as to maximize interference waveforms of respective components of second pilot light, which is different from the first pilot light in terms of the wavelength or the optical power and which has passed through from a pilot light source (270) in a reverse direction, to thereby match the optical length of the path of the first optical parametric amplification unit (238) and the path of the second optical parametric amplification unit (244); and a phase sensitive amplification device (400) for performing phase sensitive amplification on idler light and on an optical signal included in an optical transmission signal through optical parametric amplification using the excitation light controlled by using the first pilot light included in the optical transmission signal.

In the present invention, a second harmonic generator (103) generates pump light and local oscillator light from input light that is input to a second input section (102). A first demultiplexer (104) demultiplexes the pump light and the local oscillator light generated by the second harmonic generator (103). A combiner (105) combines the pump light demultiplexed by the first demultiplexer (104) with measurement light, and an amplifier (106) inputs the pump light and the measurement light combined by the combiner (105) and amplifies the measurement light through optical phase-sensitive amplification. An interferometer (108) causes 50 / 50 interference between the local oscillator light demultiplexed by the first demultiplexer (104) and the measurement light demultiplexed by a second demultiplexer (107).

The application discloses a kind of multi-modal partial discharge signal's adaptive filtering and intelligent separation method, and the application is related to power equipment insulation state monitoring and signal processing technical field, comprising the following steps: step S1: real-time acquisition power equipment partial discharge signal, and synchronously obtain equipment operating parameter and environmental noise signal.The multi-modal partial discharge signal's adaptive filtering and intelligent separation method, by dynamic coupling degree modeling and the synergistic mechanism of double-channel confrontation type decoupling, effectively solves the mode aliasing and feature distortion problem caused by signal and noise time-frequency coupling in dynamic noise environment in traditional method.Dynamic coupling path perception module quantifies the interactive characteristics of noise and signal in real time, combined with the double-channel architecture of complex domain phase-sensitive filtering and vibration trajectory matching filtering, realizes the accurate suppression of high-frequency transient interference and low-frequency periodic noise.

A kind of distributed multi-parameter sensing system based on multi-core optical fiber, including laser, laser light source is sent to the signal generator input trigger pulse drive respectively with the signal input end of phase-sensitive optical time domain reflectometer based on Rayleigh scattering and its demodulation device, Raman optical time domain reflectometer based on Raman scattering and its demodulation device, Brillouin optical time domain reflectometer based on Brillouin scattering and its demodulation device are connected, the signal output end of phase-sensitive optical time domain reflectometer and its demodulation device, Raman optical time domain reflectometer and its demodulation device, Brillouin optical time domain reflectometer and its demodulation device is connected with the signal input end of multi-core optical fiber through multi-core optical fiber fan-in fan-out module;The present application utilizes the principle of space division multiplexing, each fiber core in optical cable as separate sensing channel carries out measurement and signal transmission;Multi-core optical fiber fuses three kinds of distributed optical fiber sensing systems together, realizes in-situ measurement and mutual compensation decoupling of temperature, strain and vibration, improves the measurement precision of sensing system.

The application discloses a phase-sensitive optical receiving system for enhancing inter-satellite laser pointing measurement, comprising: an optical transceiver unit for receiving an input laser signal to be measured, collimating and beam-reducing the laser signal to be measured, obtaining a beam-reduced laser signal and outputting the same; a phase-sensitive amplification unit for receiving the input beam-reduced laser signal and pump laser, processing the beam-reduced laser signal and the pump laser, obtaining a power amplified signal and outputting the same; an optical receiver unit for receiving an optical amplified signal and a local oscillation laser, processing the optical amplified signal and the local oscillation laser, obtaining four electronic signals and outputting the same; and a data processing unit for receiving the four electronic signals, demodulating the four electronic signals, obtaining laser pointing information and outputting the same. The application implements noiseless amplification on an incident laser pointing signal through the phase-sensitive optical receiving system, and improves the detection sensitivity of a spacecraft laser pointing system.

The invention relates to a vehicle-type-based traffic flow monitoring DAS system and a signal processing method, and belongs to the technical field of intelligent traffic monitoring. A DAS system for monitoring traffic flow based on different vehicle types is characterized by comprising a sensing module based on a phase-sensitive optical time domain reflection technology and a self-adaptive signal processing module, according to the system, firstly, road vibration data are collected by using an optical fiber distributed acoustic sensing technology, vehicle vibration characteristics are selectively enhanced and background interference is suppressed in a key frequency band of 10-80 Hz through DAS-PCSE based on enhanced ultra-wavelet transform, and high-stability input characterization is generated; then, the preprocessed data are input into a lightweight DAS Trajectory Net, the network takes an encoder-decoder as a skeleton and introduces an adaptive feature enhancement module, and accurate recognition of a vehicle track is achieved; and finally, through a DAS Veple Classifier Net, a double-current signal processing module and lightweight convolution are utilized to efficiently fuse spatio-temporal information, and vehicle type discrimination is completed. According to the invention, the influence of low signal-to-noise ratio and complex background disturbance can be effectively overcome, and wide-area and all-weather vehicle-type-based traffic flow and vehicle speed monitoring can be realized with low calculation cost.

The invention relates to a magnetic resonance image reconstruction method and device, computer equipment and a storage medium, and the method comprises the steps: applying a phase-sensitive inversion recovery pulse sequence to a to-be-imaged object, collecting a magnetic resonance signal of the to-be-imaged object, and obtaining a to-be-processed image according to the magnetic resonance signal; removing a background first-order phase in the to-be-processed image to obtain a first dephasing image; according to the first dephasing image and a preset recognition model, removing a target background zero-order phase in the first dephasing image to obtain a second dephasing image; and extracting a real part component of the second dephasing image to obtain a target magnetic resonance image. By using the magnetic resonance image reconstruction method provided by the invention, the quality of the obtained target magnetic resonance image can be improved.

A distributed acoustic sensing (DAS) system may include an optical fiber, a phase-sensitive OTDR (ϕ-OTDR) coupled to the optical fiber, and a processor cooperating with the ϕ-OTDR. The processor may be configured to train a plurality of machine learning networks with DAS data from the ϕ-OTDR based upon different respective optimizers, select a trained machine learning network from among the plurality thereof based upon a game theoretic model, and generate an acoustic event report from the DAS data using the selected trained machine learning network.

The invention relates to an urban underground pipeline external force damage and road collapse supervision method and device, and belongs to the technical field of pipeline external force damage and road collapse supervision, and the method comprises the steps: an improved high-sensitivity phase-sensitive optical time domain reflectometer monitoring system senses a vibration signal, and processes and converts the vibration signal into a time-frequency spectrogram; inputting the time-frequency spectrogram into a pre-trained abnormal vibration signal classification identification and risk determination model to obtain a diagnosis result, and outputting the diagnosis result in a structured format; the diagnosis result, the occurrence time and the geographic position are uploaded to an intelligent management and control platform in real time, the intelligent management and control platform dynamically labels a GIS map according to the event type and the risk level, and a structured electronic maintenance work order is generated; and the intelligent management and control platform monitors the maintenance progress in real time and ensures a work order closed loop. The system can effectively sense, diagnose and warn underground pipeline external force damage and road collapse in a low-cost, high-safety and easy-to-operate manner.

This invention relates to a phase-sensitive optical time-domain reflectometer based on orthogonal frequency division multiplexing (OFDM) pulse coding. A continuous laser beam is split into a local path and a probe path via an optical coupler. The probe path, driven by a radio frequency signal, generates multiple frequency-orthogonal intensity-coded pulse sequences through an optical intensity modulator. These sequences are arranged sequentially in time, possessing the same symbol information but different chip sequences. The Rayleigh backscattered light generated by the pulse sequences entering the sensing fiber under test undergoes coherent interference with the local light in an optical bridge and polarization diversity module. The signal acquisition circuit utilizes an unmatched filter to achieve pulse compression and Rayleigh scattering signal separation, and synthesizes the results of the pulse coding sequences at each frequency to obtain the strain signal. Compared with existing technologies, this invention achieves pulse compression by designing an unmatched filter, improving the signal-to-noise ratio while maintaining spatial resolution. Furthermore, by synthesizing the results of orthogonal frequency pulse sequences, coherent fading is eliminated, achieving fading-free, high signal-to-noise ratio strain measurement.

This invention discloses an adaptive filtering method for phase-sensitive optical time-domain reflectometry (OTDR) signals. The method evaluates the quality of non-local mean filtering results by calculating correlation coefficients, and the filtering quality can be used to optimize the filtering parameters of the image filtering method. These parameters are first verified using a hypothetical standard signal and then applied to denoising a real signal from a phase-sensitive OTD instrument. Comparison of the correlation-optimized filtering parameters with those optimized using traditional peak signal-to-noise ratio (PSNR) and structural similarity methods shows that, except for slight differences in the neighborhood window size, the optimized filtering parameters are almost identical. This method is also applicable to image filtering of other two-dimensional periodic signals.

A distributed acoustic sensing (DAS) system may include an optical fiber, a phase-sensitive OTDR (φ-OTDR) coupled to the optical fiber, and a processor cooperating with the φ-OTDR. The processor may be configured to generate a series of covariance matrices for DAS data from the φ-OTDR, and determine an acoustic event based upon comparing the series of covariance matrices with a corresponding Toeplitz matrix.

The invention provides a front low-noise light amplification method and system for a coherent detection laser radar, and the system comprises a continuous laser receiving and transmitting module which is used for transmitting detection light and receiving an echo signal, and the echo signal serves as first signal light; the double-pump generation module is used for generating second signal light and idler frequency light having a relative phase relation with the second signal light, and the second signal light and the idler frequency light serve as first pump light and second pump light respectively; the phase sensitive light amplification module is used for performing phase sensitive light parametric amplification after the first signal light is combined with the first pump light and the second pump light; the phase locking module is used for locking the relative phase between the double-pump light and the first signal light in the phase sensitive light amplification module; and the coherent detection module is used for detecting the first signal light amplified by the phase-sensitive optical parameter and demodulating information in the target. Weak optical signals can be amplified in a high-gain mode, amplification of same-frequency background noise can be restrained, and the signal-to-noise ratio and coherent detection efficiency of echo signals can be improved.

The invention discloses a laser phase noise elimination method and system for a phi-OTDR (Optical Time Domain Reflectometer), solves the problem of dependence of a phase-sensitive optical time domain reflectometer on a high-cost narrow-linewidth laser in the prior art, and realizes reduction of the influence of the phase noise of the laser in combination with a signal processing algorithm. Therefore, the requirement of the system on the line width of the laser is relaxed, the system cost is greatly reduced, and the compatibility of a sensing system and a communication system is improved; the method comprises the following steps: injecting a composite detection pulse into a to-be-detected optical fiber to obtain backscattered light; performing coherent beat frequency on the backscattered light and the local oscillation light to obtain a synthesized complex amplitude electric signal; processing and synthesizing the complex amplitude electric signal, and separating a scattering signal component corresponding to each sub-pulse through a frequency domain filtering or decoding mode; calculating an instantaneous phase difference between the at least one pair of scattered signal components to obtain a spatial differential phase; wherein the space differential phase eliminates common phase noise introduced by the local oscillation light.

The invention relates to a four-mass horizontal axis MEMS (Micro Electro Mechanical System) gyroscope. Comprising four sensitive mass blocks, four driving mass frames, four sensitive mass coupling beams with lengthened middle parts, four sensitive mass decoupling beams, two levers, two decoupling mass blocks, a central fixed anchor point and a rectangular frame beam, the center fixing anchor point is flexibly connected with the rectangular frame beam through the double U-shaped beams at the two ends of the rectangular frame beam in the long axis direction, the four corners of the rectangular frame beam protrude in a rectangular shape, and the center fixing anchor point is connected with the decoupling mass blocks on the two sides through the four double cable-stayed beams and the rectangular frame beam. Each sensitive mass block is connected with the corresponding driving mass frame through a middle lengthened sensitive mass coupling beam; the ratio of the length of the part, extending into the sensitive mass block, of the sensitive mass coupling beam to the length of the part, exposed out of the sensitive mass block, of the sensitive mass coupling beam ranges from 1: 3 to 1: 2. According to the invention, the frequency difference between the in-phase sensitive mode and the anti-phase sensitive mode is increased, and the comprehensive performance such as anti-interference performance, sensitivity and linearity, robustness and reliability is improved.

The invention discloses a vibration sensing method based on a distributed optical fiber sound wave sensing system, which comprises the following steps of: injecting continuous light waves into a sensing optical fiber, and applying dynamic polarization disturbance to obtain a polarization state evolution sequence of Rayleigh backscattered light; performing differential processing on the polarization state sequence to extract polarization state variation caused by vibration; and inputting the signal subjected to differential processing into a pre-trained deep neural network model, and directly outputting vibration distribution information along the sensing optical fiber by the model, including vibration position, frequency and amplitude. The system comprises a narrow linewidth laser source module, a polarization modulation and disturbance module, a circulator, a sensing optical fiber, a polarization detection module and an intelligent signal processing module. According to the method, the problem of fading noise in traditional phase-sensitive distributed optical fiber sensing is solved by utilizing polarization state difference and deep learning.

The application discloses a bearing fault acoustic detection method and system based on fractional harmonic phase-locked amplification, acoustics signals of a target motor are acquired, the shaft rotation frequency of the motor shaft is measured in real time, and is synchronized to a fractional phase-locked loop; according to the geometric parameters of the bearing, the bearing fault characteristic frequency is calculated, the bearing fault characteristic frequency is a non-integer multiple of the shaft rotation frequency, a reference signal synchronized to the bearing fault characteristic frequency is generated through the fractional phase-locked loop, and the acquired acoustics signals and the generated reference signal are detected in a phase-sensitive manner through a phase-locked amplifier; specifically, the acoustics signals and the reference signal are quadrature demodulated to generate in-phase components and quadrature components, direct current components are extracted through low-pass filtering, and then the vibration amplitude and phase information corresponding to the bearing fault characteristic frequency are calculated; according to the comparison between the vibration amplitude and a preset baseline, harmonic consistency and phase stability, the bearing fault type and severity are determined.

The invention relates to an urban underground pipeline external force damage and road collapse supervision method and device, and belongs to the technical field of pipeline external force damage and road collapse supervision, and the method comprises the steps: an improved high-sensitivity phase-sensitive optical time domain reflectometer monitoring system senses a vibration signal, and processes and converts the vibration signal into a time-frequency spectrogram; inputting the time-frequency spectrogram into a pre-trained abnormal vibration signal classification identification and risk determination model to obtain a diagnosis result, and outputting the diagnosis result in a structured format; the diagnosis result, the occurrence time and the geographic position are uploaded to an intelligent management and control platform in real time, the intelligent management and control platform dynamically labels a GIS map according to the event type and the risk level, and a structured electronic maintenance work order is generated; and the intelligent management and control platform monitors the maintenance progress in real time and ensures a work order closed loop. The system can effectively sense, diagnose and warn underground pipeline external force damage and road collapse in a low-cost, high-safety and easy-to-operate manner.

The invention discloses a nanoscale thin film thickness measurement method based on a phase sensitive terahertz spectrum, and the method comprises the steps: S1, obtaining a reference terahertz time-domain signal when no sample exists and a sample terahertz time-domain signal when a thin film sample needs to be measured through a terahertz time-domain spectrum system; s2, performing time-frequency transformation on the reference terahertz time-domain signal and the sample terahertz time-domain signal, and respectively extracting phase information of the reference terahertz time-domain signal and the sample terahertz time-domain signal in a frequency domain; s3, calculating a phase difference spectrum of the sample terahertz time-domain signal relative to the reference terahertz time-domain signal; and S4, based on the phase difference spectrum and the refractive index information of the thin film material, through a phase-thickness relation model, carrying out inversion calculation to obtain the thickness of the thin film. The nanoscale film thickness measuring method based on the phase sensitive terahertz spectrum overcomes the problems that an existing terahertz thickness measuring technology is limited in resolution, and a nanoscale film is difficult to measure.

The utility model discloses a reflection measuring device for a wave-absorbing material, which belongs to the technical field of wave-absorbing material detection and comprises a bottom plate, a background wave-absorbing material and a placing table, a rotating component is arranged between the bottom of the placing table and the top of the bottom plate, two groups of adjusting columns are mounted at two ends of the top of the placing table, and the adjusting columns are connected with the background wave-absorbing material. A pressing plate is arranged on one side of the adjusting column, an adjusting mechanism is arranged between one end of the pressing plate and one side of the adjusting column, and a measuring assembly is arranged above the bottom plate; according to the utility model, through the cooperative use of the placing table, the adjusting column, the pressing plate and the adjusting mechanism, a wave-absorbing material needing reflection measurement can be fixed at the top of the placing table, so that the position of a tested material sample is ensured to be strictly aligned with the axis of a test antenna, and the error of a reflection path caused by sample deviation is avoided; phase sensitive measurement is prevented from being influenced after micro displacement of the sample, and the precision and accuracy of measurement are improved.

The application relates to the technical field of measuring electric variables, and provides a digital phase-sensitive rectification method, a system and a computing device.The system comprises: an analog-to-digital conversion module which converts an alternating current signal into a discrete signal; a plurality of phase rectification modules which respectively perform full-wave rectification on the discrete signal for one period with different reference phases as starting points and obtain rectification values through accumulation of rectified waveform data; an amplitude analysis module which obtains an amplitude linear representation value based on the rectification values of a response signal; a phase offset analysis module which obtains a phase offset based on the rectification values with one reference phase as a basic phase; and a measured signal analysis module which obtains a measured linear representation value of a measured signal based on the amplitude linear representation value and the phase offset.The application can filter out correlation interference.

The invention relates to the technical field of distributed optical fiber sensing, and discloses a phase-sensitive optical time domain reflection system data processing method based on a three-dimensional total variation algorithm, comprising the following steps: acquiring a backward Rayleigh scattering signal of a phase-sensitive optical time domain reflection system; converting the three-dimensional signal into an original three-dimensional signal containing a spatial dimension, a time dimension and a local time window dimension; minimizing the weighted three-dimensional total variation as a target, and performing weighted three-dimensional total variation regularization denoising processing on the original three-dimensional signal; performing discretization processing on the denoised three-dimensional signal to obtain a discrete three-dimensional signal; carrying out updating iteration on the discrete three-dimensional signal; and finally, the de-noised three-dimensional signal is obtained, and dimension reduction is carried out to obtain a two-dimensional matrix signal. According to the invention, the signal-to-noise ratio of the system can be improved, and accurate extraction of vibration information is realized.

The invention discloses a CEEMDAN-PCC-based phase-sensitive optical time-domain reflectometer signal processing method and system. The method comprises the following steps: decomposing a backward Rayleigh scattering light signal output by a phase-sensitive optical time-domain reflectometer into a plurality of IMF components and residual components by adopting a CEEMDAN algorithm; and screening the decomposed components according to the calculated Pearson correlation coefficient between the backward Rayleigh scattering light signal and each IMF component, and determining the position of the disturbance point based on the screened components. The method solves the problems that in an existing signal processing method of the phase-sensitive optical time-domain reflectometer depending on wavelet decomposition and EMD, the adaptability of wavelet decomposition is weak, and modal aliasing and endpoint effect are prone to occurring in the decomposition process of EMD.

The application provides a phase-sensitive optical time domain reflectometer, which comprises a polarization diversity receiving module, an amplification circuit and a signal acquisition and processing unit; a controller of the polarization diversity receiving module can adjust a first transimpedance amplifier, a second transimpedance amplifier and a gain multiple of the amplification circuit according to first photodetector information and the like sent by the signal acquisition and processing unit, so that the total gain of X-state electric polarization signals and Y-state electric polarization signals output by the amplification circuit is consistent, the problem of original output power imbalance is overcome from the perspective of ensuring responsivity and amplification multiple, then a polarization compensation coefficient is generated according to a preset rule to compensate for power imbalance caused by the polarization diversity receiving module manufacturing process. The application further discloses a method for eliminating polarization-dependent loss.

Provided is an optical transmission system including: a phase conjugate conversion device that performs optical parametric amplification, monitors power of a first polarization component and a second polarization component of first pilot light, synchronizes phases of harmonics and the first pilot light by controlling a phase of pump light to cause each optical power of the first pilot light to be maximum, and matches optical lengths of paths of a first optical parametric amplification unit and a second optical parametric amplification unit by controlling a transfer device arranged in at least one of the paths to cause an interference waveform of components of second pilot light to be maximum when the second pilot light is caused to pass in a second direction, the second pilot light having at least a wavelength or optical power different from that of the first pilot light; and a phase-sensitive amplification device that performs phase-sensitive amplification of an optical signal included in an optical transmission signal and idler light by optical parametric amplification using the pump light controlled by using the first pilot light included in the optical transmission signal.