47 results about "Single-sideband modulation" patented technology

This invention discloses a simple, multifunctional, integrated 5G analog fronthaul in-band full-duplex communication method for remote units (RUs). This method primarily relates to the fields of optical communication technology and microwave technology. The system structure of the method, as shown in Figure 1 of the specification, includes a laser, downlink vector signal, electrical local oscillator signal, downlink interference signal, target signal, reference signal, 90° electrical coupler, dual-polarization quadrature phase-shift keying modulator, phase modulator, single-mode fiber, optical coupler, polarization beamsplitter, polarization beam combiner, polarization controller, polarizer, and photodetector. The remote unit (RU) uses a single phase (PM) modulator to achieve self-interference cancellation (SIC) combined with anti-fiber dispersion transmission and down-conversion, eliminating the need for bias control and additional local oscillator (LO) branches, resulting in a simple structure. At the central office (CO), the carried downlink signal and local oscillator signal are single-sideband modulated to achieve anti-fiber dispersion transmission. The RU uses wavelength reuse technology to perform PM cascaded down-conversion on the signal received from the uplink, and the SIC is moved from the RU to the CO to simplify the RU. The entire link has no optical filter and is reconfigurable.

The application discloses a kind of bandwidth saving coherent transmission method and PON system, it is related to optical access network technical field, including: in downlink transmission direction, OLT sending end generates M digital subcarriers, after digital-analog conversion, it is carried out double polarization modulation, as downlink signal is sent to ONU receiving end;Each subarea ONU receiving end carries out heterodyne coherent detection to the partial spectrum of downlink signal, and downlink signal occupies the single sideband spectrum of ONU end light source;In the direction of uplink transmission, the data of corresponding digital subcarrier is generated by ONU sending end, and single sideband modulation is carried out based on ONU end light source, as uplink signal is sent to the OLT receiving end of corresponding subarea, and uplink signal occupies another single sideband spectrum of ONU end light source;OLT receiving end carries out analog-digital conversion and digital signal processing after heterodyne coherent detection.The application selects subcarrier by configuring light source of different wavelength at ONU end to reduce device bandwidth, so that PON system reduces cost while maintaining transmission capacity, sensitivity and flexibility.

This invention proposes a method for generating broadband signals that is resistant to dispersion fading based on an electro-optical modulator. By rationally changing the phase of the driving signal, a chirp signal with opposite chirp signs can be generated during the beat frequency, thereby switching between single chirp and double chirp. Furthermore, this scheme proposes carrier-suppressed single-sideband modulation of the chirp signal, which effectively avoids amplitude fading caused by dispersion in optical fiber transmission while eliminating interference signals that fall within the chirp signal band after the beat frequency. The proposed scheme based on the DP-DPMZM integrated device is easy to integrate, has a simple structure, and is low-cost. The generated dual-band chirp signal can be flexibly switched between up-chirp, down-chirp, and double chirp, greatly improving the flexibility of the system. Furthermore, it effectively eliminates amplitude fading caused by dispersion in optical fiber transmission, significantly increasing the transmission distance of traditional systems. This scheme is expected to provide technical support for the development of future high-performance radar technology.

The invention belongs to the technical field of optics, and particularly relates to an unequal-interval frequency comb generation and detection device and method based on a single side band modulator. In order to improve phase coherence between comb teeth, an arbitrary waveform generator generates a modulation signal, the modulation signal is amplified by a power amplifier and then input into a single-side-band phase modulator, a laser is connected with an optical signal input end of the single-side-band phase modulator, and an output end of the single-side-band phase modulator is connected with an optical beam splitter. The light beam splitter divides light into two paths, one path serves as reference light to enter the first detector, the first detector converts the reference light into an electric signal and then carries out FFT observation, the other path serves as detection light, is absorbed by the gas chamber and then is input into the second detector, and the second detector converts the detection light into an electric signal and then carries out FFT observation.

The application provides a wireless signal generation device and method based on integrated optical comb synchronization. The device comprises: an integrated optical comb repetition frequency signal generation unit: generating an optical comb signal, filtering the optical comb signal to obtain first and second optical signals adjacent to the beam, and third and fourth optical signals with different frequencies, and obtaining a high-frequency clock signal with the same frequency as the optical comb signal by combining, amplifying and frequency mixing the first and second optical signals; a standard microwave clock signal generation unit: after amplification and filtering of the high-frequency clock signal, the microwave clock signal with a standard frequency and synchronized with the high-frequency clock signal is obtained by integer frequency division and decimal frequency division in turn; a wireless signal generation unit: converting the microwave clock signal into a low-frequency baseband signal, generating an optical carrier microwave signal by single sideband modulation of the fourth optical signal through the low-frequency baseband signal, and obtaining a high-frequency coherent wireless signal by combining and frequency mixing the optical carrier microwave signal and the third optical signal.

The invention provides a signal generation system. The signal generation system comprises an external modulation laser, an optical splitter, a Mach-Zehnder modulator, a phase shifter, an attenuator, a coupler and a photoelectric conversion unit. According to the invention, Mach-Zehnder modulation is carried out on optical carriers through asymmetric double single side band signals, and millimeter wave / terahertz signals in the form of optical signals are obtained through destructive interference between output signals of a phase shifter and an attenuator and optical signals subjected to Mach-Zehnder modulation. And finally, millimeter wave / terahertz signals in an electric signal form are obtained through the photoelectric conversion unit. Millimeter wave / terahertz signals are generated by adopting a single push-pull Mach-Zehnder modulator and attenuator optical double-single-side-band modulation, transmitter precoding and a complex and expensive I / Q modulator are avoided, the complexity and cost of the system can be effectively reduced, meanwhile, the frequency interval can be flexibly adjusted, and the system performance is improved. And the tunable range of the system is increased.

Circuit and method for electro-optic modulation of an RF signal to produce a single-sideband reduced-carrier phase-shifted (SSB-RC-PS) modulated signal includes: receiving an optical carrier signal; receiving the RF signal; modulating the RF signal with a first portion of the optical carrier to produce a single sideband (SSB) modulated signal; amplitude and phase modulating a second portion of the optical carrier signal and combining with the modulated signal to produce a first combined signal, the amplitude modulation and phase modulation of the second portion of the optical carrier signal are dynamically controlled to directly match the amplitude and inversely match the phase of the modulated signal; and amplitude modulating and phase modulating a third portion of the optical carrier signal and combining third portion with the first combined signal to produce the second combined signal, the product of which is a single sideband reduced carrier phase shifted (SSB-RC-PS) modulated signal.

This invention discloses a coherent transmission method and PON system based on digital subcarrier multiplexing, relating to the field of optical access network technology. The method includes: in the downlink transmission direction, the OLT transmitter generates an Alamouti-coded signal of M digital subcarriers, performs digital-to-analog conversion and dual polarization modulation, and transmits it as a downlink signal to the ONU receiver; the ONU receiver performs heterodyne coherent detection, analog-to-digital conversion, and digital signal processing, with the downlink signal occupying a single-sideband spectrum of the ONU's light source; in the uplink transmission direction, the ONU transmitter generates data of M digital subcarriers, performs digital-to-analog conversion, and then performs single-sideband modulation based on the ONU's light source, transmitting it as an uplink signal to the OLT receiver, with the uplink signal occupying another single-sideband spectrum; the OLT receiver performs analog-to-digital conversion and digital signal processing after coherent reception. This application enables bidirectional high-speed transmission, and uses the same light source for both transmission and reception at the ONU, which increases the capacity of the PON system, simplifies the ONU's structure and algorithm, and reduces system costs.

The invention discloses a single-channel direction finding system based on optical single side band modulation and an implementation method thereof, belongs to the technical field of radio frequency signal processing, and solves the problem that the direction finding efficiency is low under the conditions of frequency hopping, short duration, uncertain arrival and end time and the like of received radio frequency signals. The existing single-channel direction finding technology is difficult to realize broadband, high probability and real-time direction finding in electronic reconnaissance equipment. Comprising N antennas used for receiving N radio frequency signals respectively, a multi-channel electro-optical conversion unit connected with the N antennas, a reference signal generation unit and a photoelectric synthesis conversion unit which are connected with the multi-channel electro-optical conversion unit, and a signal processing unit connected with the photoelectric synthesis conversion unit. According to the method, high-probability interception and accurate direction finding of radio frequency signals can be realized in a large instantaneous frequency range, and the method has obvious advantages in the aspects of performance level, implementation architecture and the like.

This invention relates to an optical frequency domain reflection system and method based on a voltage-controlled oscillator (VCO). The system mainly includes an arbitrary function generator, a laser, a VCO, a single-sideband modulator, an auxiliary interferometer, a main interferometer, and a polarization beam splitter. The arbitrary function generator, laser, VCO, and VSB modulator work together to generate the sweeping light required for measurement. This sweeping light is split into two paths: one path enters the main interferometer as probe light, and the other path enters the auxiliary interferometer to obtain the instantaneous frequency of the probe light. Based on the instantaneous frequency, the signal from the main interferometer is resampled using a one-dimensional interpolation method. This invention uses a low-cost, small-sized VCO as the radio frequency signal generator to generate a sweeping signal with fast frequency modulation performance, and compensates for phase noise caused by the nonlinearity of the sweeping signal by designing the optical path of the auxiliary interferometer and using a linear interpolation algorithm.

This invention discloses a method for generating broadband microwave signals based on microwave photonics technology. A reference microwave signal and an excitation microwave signal are simultaneously passed through a 90° microwave bridge to obtain two orthogonal microwave signals. These two orthogonal microwave signals are then used to perform carrier-suppressed single-sideband modulation on an optical carrier using a dual parallel intensity modulator. The generated modulated optical signal is then optically amplified and filtered before photoelectric conversion to generate a frequency-converted microwave signal. This frequency-converted microwave signal is split into two paths: one is used as the system output, and the other is electrically amplified and filtered before being fed back to the 90° microwave bridge, thus forming a closed frequency conversion loop. After multiple frequency conversions, the system outputs an ultra-wide bandwidth microwave signal. This invention also discloses a broadband microwave signal generation device based on microwave photonics technology. Compared with existing technologies, this invention can generate ultra-wide bandwidth microwave signals in different frequency bands and multiple formats.

The invention discloses a microwave photon channelized receiving method based on a double-vernier effect. The method comprises the following steps: S1, generating two paths of coherent optical frequency comb signals of which the initial frequency and the free spectral range are slightly different; s2, performing single side band modulation on the two paths of optical frequency comb signals by using the original radio frequency signal; s3, respectively carrying out wavelength division multiplexing on the two paths of modulated optical signals, separating out each comb tooth and radio-over-fiber signal components at the same frequency with each comb tooth in the other path of modulated optical signals, and then forming a local oscillator / signal pair by the comb teeth at the same frequency and the radio-over-fiber signal components; and S4, performing dual-output image frequency suppression mixing on each group of local oscillator / signal pairs. The invention further discloses a microwave photon channelization receiving device based on the double-vernier effect. Compared with the prior art, the channelization efficiency and the image frequency suppression effect can be greatly improved.

The invention relates to the technical field of distributed optical fiber sensing, in particular to an optical fiber Rayleigh scattering signal enhancement device based on a chaotic Brillouin dynamic grating, which comprises a chaotic laser, chaotic laser from the first output end of the first coupler is subjected to sideband modulation through a single sideband modulator, passes through a first polarization controller and a first polarizer, and enters a sensing optical fiber as first pump light; a chaotic laser signal output from the second output end of the first coupler passes through a second polarization controller, a second polarizer and a polarization beam splitter and then enters the sensing optical fiber from the other end of the sensing optical fiber as second pump light; the two paths of pump light meet in the sensing optical fiber and generate a stimulated Brillouin effect to form a chaotic Brillouin dynamic grating; according to the invention, the chaotic laser is adopted to form the chaotic Brillouin dynamic grating, so that the Rayleigh scattering response bandwidth of a detection signal is obviously widened, and the bandwidth of a Rayleigh scattering enhanced signal is improved.

The present invention discloses a single-channel direction-finding system based on optical single-sideband modulation and an implementation method, belonging to the field of radio frequency signal processing technology. The system solves the problem that existing single-channel direction-finding technology cannot achieve broadband, high-probability, and real-time direction-finding in electronic reconnaissance equipment when the received radio frequency signal has frequency hopping, short duration, and uncertain arrival and end times. The system includes N antennas for receiving N radio frequency signals, a multi-channel electro-optical conversion unit connected to the N antennas, a reference signal generating unit and an optoelectronic synthesis conversion unit connected to the multi-channel electro-optical conversion unit, and a signal processing unit connected to the optoelectronic synthesis conversion unit. The present invention can achieve high-probability interception and accurate direction-finding of radio frequency signals in a large instantaneous frequency range, and has obvious advantages in terms of performance level and implementation architecture.

The invention discloses an optical carrier suppression single side band modulation device and method based on a variable optical coupler. The device comprises a laser, a first adjustable optical coupler, an optical single side band modulation module, a second optical phase shifter and a fourth adjustable optical coupler. And the first adjustable optical coupler divides the optical carrier into two paths according to a preset proportion, and the two paths are respectively input into the optical single side band modulation module and the second branch, so that the power matching of the two paths of carriers is ensured. The optical single side band modulation module comprises a second adjustable optical coupler, a first optical phase shifter and a third adjustable optical coupler, and accurate splitting ratio control and phase adjustment are achieved. And the second optical phase shifter performs phase adjustment on the second branch optical carrier to enable the second branch optical carrier to be opposite to the carrier phase in the modulation signal, and a high-purity optical carrier suppression single side band signal is output through combination of a fourth adjustable optical coupler. According to the invention, through cooperative configuration of the multi-stage adjustable device, process errors are effectively overcome, the carrier-to-sideband suppression ratio and the system power efficiency are improved, and the method can be applied to the fields of radio over fiber communication and the like.

The application relates to the field of distributed optical fiber sensing, and discloses a high-speed chaotic Brillouin sensing device and method based on a correlation method multi-address positioning method, wherein strong periodic broadband chaotic laser is divided into two beams through a first beam splitter, one beam is used as probe light and sequentially enters a sensing optical fiber after passing through a single sideband modulator and an erbium-doped fiber amplifier; the other beam sequentially passes through an optical delay line, an erbium-doped fiber amplifier, and a second beam splitter to be divided into pump light and reference light, the pump light passes through an optical circulator and occurs stimulated Brillouin amplification with the probe light at different positions in the sensing optical fiber; the signal in the sensing optical fiber is output after passing through the optical circulator, Stokes light is filtered out by a tunable optical filter and is detected by a first photodetector, the reference light is detected by a second photodetector, a data acquisition unit collects two-way signals and sends the two-way signals to a computer for data processing; the application improves the signal-to-noise ratio of the system, widens the sensing distance, and realizes high-speed and accurate positioning of multiple sensing points.

The invention discloses an information processing method, and the method comprises the steps: detecting a single side band modulation SSB signal after the SSB signal is received, and obtaining a first peak value of a main synchronization signal and a second peak value of an auxiliary synchronization signal which are included in the SSB signal; determining the position of a time slot head of the SSB signal based on the first peak value and the second peak value; and performing downlink beam synchronization based on the position of the time slot head. The invention further discloses an information processing device and equipment, a computer readable storage medium and a computer program product.

The present disclosure relates to a device and a communication method with which it is possible to perform appropriate filtering / image suppression when single side band modulation is used for D2R transmission of an A-IoT device. A device that has a lower complexity than an NB-IoT device comprises: a transmission unit that transmits to a wireless base station by using single side band modulation; and a control unit that selects either an upper side band or a lower side band in the single side band modulation, and uses the selected side band to perform transmission control of a transmission signal to the wireless base station.

The application discloses an encryption communication method and system based on probability shaping and double single sideband modulation, and the method comprises the following steps: receiving an original bit stream and an initial key, generating a chaotic sequence according to the initial key by using a hyperchaotic model; calculating a mask factor according to the chaotic sequence; performing constellation mapping processing on the original bit stream to obtain a constellation diagram; performing rotation encryption on the constellation diagram according to the mask factor to obtain an encrypted signal; performing QPSK modulation on the encrypted signal to obtain a left sideband carrier signal; performing constellation mapping on the initial key after repeating and superimposing to obtain a key signal; performing probability shaping and QPSK modulation on the key signal to obtain a right sideband carrier signal; superimposing the left sideband carrier signal and the right sideband carrier signal to obtain a mixed signal, and transmitting the mixed signal to a receiver through a transmitter; and the safety and reliability of key transmission are improved while the signal transmission efficiency is ensured.

To provide a device and a communication method that can perform appropriate filtering / image suppression when single sideband modulation is used for D2R transmission of an A-IoT device.SOLUTION: A device with lower complexity than an NB-IoT (Narrow Band Internet of Things) device includes a transmitter that transmits to a wireless base station using single sideband amplitude modulation, and a controller that selects either an upper sideband or a lower sideband in the single sideband modulation and controls transmission of a transmission signal to the wireless base station using the selected sideband.SELECTED DRAWING: Figure 11

A microwave photon frequency-hopping transmission and reception system comprises a dual-band, dual-frequency cascaded optical frequency comb module, a transmission carrier generation and signal modulation module, a radio frequency transmission module, an orthogonal optical sampling clock generation module, an electro-optical sampling and orthogonal demultiplexing module, a radio frequency reception module, an optoelectronic conversion and digital processing module, and a synchronization and control module. In the frequency-hopping transmission portion, the communication signal is loaded onto the optical carrier via carrier-suppressed single-sideband modulation. The beat frequency of the optical carrier and the optical comb teeth selected by the optical switch generates an RF transmission signal carrying the communication signal. Rapid switching of the optical switch enables rapid, flexible, and wide-range switching of the transmission carrier frequency. In the frequency-hopping reception portion, the optical comb teeth are selected by the optical switch to generate an orthogonal optical sampling clock. Rapid switching of the optical switch enables rapid, flexible, and wide-range switching of the center frequency of the receiving passband. Flexible configuration of the frequency-hopping reception passband bandwidth is achieved by varying the filter bandwidth.

The invention discloses an optical fiber scattering sensing system and method for satellite structure temperature measurement, and belongs to the technical field of optical fiber sensing. The system comprises a narrow linewidth semiconductor laser, an optical fiber coupler, a detection light path, a pump light path, a sensing optical fiber, a circulator, a photoelectric detector and a data processing module. A polarization controller is independently arranged in the detection light path so as to accurately regulate and control the polarization state of the detection light and realize optimal polarization matching with the pump light; a single side band modulator and a microwave source are adopted in a pump light path to accurately control the frequency shift amount, and high-selectivity amplification of a target sound mode is achieved in combination with an erbium-doped optical fiber amplifier. The measurement method comprises the following steps: selecting a target acoustic mode, calibrating frequency shift-temperature sensitivity coefficients in non-amplification and amplification states, and resolving the temperature variation by using the amplified high sensitivity coefficient. According to the invention, the signal-to-noise ratio and the measurement precision of the signal are remarkably improved through the Brillouin amplification technology, and the device has the advantages of light weight, simple structure and high environmental adaptability.

The invention discloses a frequency control array MIMO signal generation system and method based on photon phase modulation, and the system outputs an optical carrier wave through a laser, the optical carrier wave is divided into two paths through a first optical splitter: one path loads a radio frequency signal through a carrier wave suppression single side band modulation module, and after a specific frequency optical signal is generated, the optical signal is divided into N paths through a third optical splitter; and the other path is divided into N paths of optical carriers through a second optical splitter, and the N paths of optical carriers are input into a phase modulation module. The phase modulation module loads a quadrature phase coding signal and a sawtooth wave signal to the optical carrier to form a phase modulation signal. And after the optical coupling module couples the two paths of signals, the photoelectric detection module performs beat frequency to generate N channels of FDA-MIMO signals. The system has the characteristics of large bandwidth, flexible and adjustable frequency offset and phase encoding format, strong channel expansibility, simple structure and the like.

The invention provides a broadband phased array system based on an optical frequency comb and channelization processing. The broadband phased array system comprises an optical frequency comb generator, a single sideband modulator, a first periodic narrow-band filter array, a second periodic narrow-band filter array, a delay line array, a dense wavelength division multiplexing module, a photoelectric detector array and an antenna array. The system generates equally spaced optical carriers through an optical frequency comb, loads broadband signals through single side band modulation, and carries out channelized segmentation by using a narrow-band filter; delay is applied to each channel signal by an independent delay line, and an equal difference phase between array elements is generated based on the equal interval characteristic of the optical frequency comb; and after being recombined by the narrow-band filter array and decoupled by wavelength division multiplexing, the light is converted by the photoelectric detector and radiated by the antenna array, and finally a directional wave beam is formed. According to the invention, multiple array element phases can be controlled through a single delay line, independent beam pointing of signals with different frequencies is supported, and the stability and the flexibility are extremely high.

This invention discloses a dispersion measurement system based on microwave photonics technology. It uses a microwave signal generated by a first signal generator to perform carrier-suppressed single-sideband modulation (CSSM) on an optical signal generated by a laser. Then, the primary modulated optical signal is used as the carrier signal of a second electro-optic modulator. The microwave signal generated by the second signal generator is then used to perform carrier-unsuppressed CSSM on this optical carrier signal, and the modulated signal is split into two paths. One CSSM-modulated optical carrier microwave signal is used as a probe light to sense the dispersion of the dispersive element under test (DIST), and the other path is used as a reference light. The probe light signal passing through the DIST is converted into a corresponding dispersion-sensing electrical signal, while the reference light signal not passing through the DIST is converted into a corresponding reference electrical signal. The phase difference between the two electrical signals is detected to obtain a voltage value related to the phase difference, and the dispersion coefficient of the DIST corresponding to the current optical carrier wavelength is calculated based on the voltage value.

The invention relates to a silicon-based single-sideband modulator chip with low driving voltage and high sideband rejection ratio. The silicon-based single-sideband modulator chip comprises a first end face coupler, a second end face coupler, a single-sideband modulator module, a first-stage unequal-ratio beam splitter, a monitoring detector and a silicon optical switch. On the basis of the plasma dispersion effect of a silicon-based photoelectron chip in principle, the phase of the modulator is efficiently regulated and controlled through carrier injection through a carrier injection type modulator structure, the working swing of the single-sideband modulator is reduced, and meanwhile the high sideband rejection ratio is kept; on the system level, a thermo-optic phase shifter is arranged in the single-sideband modulator to be matched with an external monitoring detector to achieve accurate regulation and control of phases, and meanwhile, a beam splitter is arranged to enable the single-sideband modulator to be compatible with on-chip and off-chip applications. The circuit is simple in design, can reduce the power consumption and cost and improve the integration level compared with a traditional scheme, and has a good application prospect.

A single-sideband phase-sensitive detection method is provided. A time-dependent target signal of a to-be-detected system is repeatedly triggered. A plurality of modulation signal sets varying in modulation phase corresponding to a plurality of triggering moments are generated. The time-dependent target signal is modulated based on the plurality of modulation signal sets corresponding to each of the triggering moments to obtain a plurality of detection signal sets varying in time and modulation phase. The plurality of detection signal sets are processed to obtain a plurality of equivalent single-sideband modulation signal sets. The plurality of equivalent single-sideband modulation signal sets are demodulated to obtain a plurality of processed signals. A single-sideband phase-sensitive detection system, device, storage medium and computer program product are also provided.

The invention discloses an optical fiber sensing integrated system based on a Kramers-Kronig receiver, and the specific structure is as follows: a narrow linewidth laser and a single sideband modulator generate a linear frequency modulation optical signal as a common optical carrier, and the optical carrier is divided into two paths through a polarization-maintaining coupler; one path of optical carrier carries a single-side-band communication signal through an IQ modulator to generate an optical single-side-band signal; the other linear frequency modulation optical carrier is coupled with the generated optical single side band signal through an optical fiber coupler to generate a sensing integrated optical signal; a communication receiving end (far end) adopts a high-speed photoelectric detector to convert an optical signal into an electric signal, and a Kramers-Kronig relation is utilized to recover a field signal; and a sensing receiving end (local end) adopts a linear frequency modulation optical signal generated by the sending end as local oscillator laser, and obtains a sensing signal by using coherent detection. The system is simple and efficient, can realize communication enhancement, and has high spectrum efficiency and high system flexibility.

The invention relates to the technical field of distributed optical fiber sensing, and discloses a rock burst prediction device and method based on a Brillouin dynamic grating, and the device comprises a narrow linewidth laser and a tunable laser. After narrow-linewidth laser output by the narrow-linewidth laser device is divided into two beams, one beam is subjected to Brillouin frequency shift through the single-sideband modulator, is adjusted to be x-axis polarization through the first polarization controller and then enters the polarization-maintaining sensing optical fiber, and the other beam is adjusted to be x-axis polarization through the second polarization controller and the polarization-maintaining beam splitter in sequence and then enters the polarization-maintaining sensing optical fiber. The two beams of light enter the polarization-maintaining sensing optical fiber from the other end, meet in the polarization-maintaining sensing optical fiber and form a Brillouin dynamic grating; after being subjected to pulse modulation, probe light output by the tunable laser is adjusted into y-axis polarization through the polarization-maintaining beam splitter, then enters the polarization-maintaining sensing optical fiber from the other end and is reflected by the Brillouin dynamic grating, and reflected light is collected by the spectrograph and subjected to data processing through the control terminal to achieve prediction of impact low pressure. According to the method, the flexibility and adaptability of rock burst prediction are remarkably improved.