619 results about "Multi core fiber" patented technology

The invention provides a time division multiplexing multi-parameter synchronous sensing method and system based on a multi-core optical fiber. A multi-core optical fiber containing three heterogeneous fiber cores is embedded into a measured object, and a distributed reflection grating array forming an inclined angle with the axial direction is inscribed on the surface of each fiber core; energy exchange data between modes of all fiber cores and reflection grating wavelength shift signals are synchronously collected by adopting a time division multiplexing technology, phase difference signals are extracted through a cross correlation algorithm to serve as curvature reference values, dynamic compensation operation is carried out on the wavelength shift data and the phase signals, and accurate strain distribution is obtained after temperature interference is effectively eliminated; a coordinate transformation model is established by combining the three-dimensional geometric parameters of the spiral optical fiber, vector synthesis is performed on the curvature reference and the strain parameters, and accurate reconstruction of the three-dimensional deformation field of the measured object is realized. According to the technical scheme provided by the invention, through multi-core fiber multi-parameter synchronous sensing and three-dimensional coordinate mapping, temperature self-compensation high-precision three-dimensional deformation field real-time reconstruction is realized.

The invention provides a wavelength division multiplexing-fused multi-core optical fiber temperature detection method and system. Wherein the broadband light source is divided into multiple wavelength channels through wavelength division multiplexing, and a wavelength-fiber core mapping relation is established, so that each fiber core of the multi-core optical fiber transmits a single-wavelength optical signal. An optical fiber is integrated to the surface of an object according to a three-dimensional path, each fiber core covers a plurality of sensing sub-areas, the wavelength drift amount caused by temperature is extracted by detecting the attenuation characteristic of an optical signal at a bending position, the wavelength drift amount is converted into a temperature value in combination with a calibration curve, and a temperature gradient model bound with the fiber core position is constructed. And further performing spatial solution by using fiber core spacing, wavelength mapping and transmission time delay parameters, establishing a corresponding relationship between the coordinates of the sensing sub-regions and the temperature, and finally reconstructing three-dimensional temperature field distribution. According to the technical scheme provided by the invention, high-resolution dynamic reconstruction and gradient analysis of a three-dimensional temperature field on a complex surface are realized through wavelength-space two-dimensional decoupling.

A medical device operating as a stylet is described. The medical device can include an insulating layer (or sheath) encapsulating both a multi-core optical fiber and a conductive medium. The optical fiber can include a cladding and a plurality of core fibers spatially arranged within the cladding. Each of the core fibers can include a plurality of sensors distributed along a longitudinal length of that corresponding core fiber and each of these sensors can be configured to: (i) reflect a light signal of a different spectral width based on received incident light, and (ii) change a characteristic of the reflected light signal for use in determining a physical state of the multi-core optical fiber. The conductive medium can provide a pathway for electrical signals detected at a distal portion of the conductive medium. The conductive medium may be concentric to the cladding, but separate and adjust thereto.

A system, apparatus and method directed to detecting damage to an optical fiber of a medical device. The optical fiber includes one or more core fibers each including a plurality of sensors configured to (i) reflect a light signal based on received incident light, and (ii) alter the reflected light signal for use in determining a physical state of the multi-core optical fiber. The system also includes a console having non-transitory computer-readable medium storing logic that, when executed, causes operations of providing a broadband incident light signal to the multi-core optical fiber, receiving reflected light signals, receiving reflected light signals of different spectral widths of the broadband incident light by one or more of the plurality of sensors, identifying at least one unexpected spectral width or a lack of an expected spectral width, and determining the damage has occurred to the optical fiber based on the identification.

The invention discloses a multi-mode optical signal transmission method and device, electronic equipment and a storage medium, and relates to the technical field of computers.The transmitted data stream is divided into a control signal and a data signal, the control signal is a visible light wave band, the data signal is an infrared wave band, and the control signal and the data signal are combined to a single multi-core optical fiber through a combiner; the optical network controller allocates subcarrier resources as required according to the change of network flow in a spectrum dynamic allocation mode to perform data transmission, so that the subcarrier resource allocation adapted to the change of network flow improves the dynamic adaptability, and the allocation of the subcarrier resources as required improves the equipment cooperation efficiency, and in the data transmission process, the data transmission efficiency is improved. Clock synchronization and signal encryption are realized through a quantum key distribution mode, and the security is improved.

The invention provides a high and low temperature alternating environment temperature and pressure mixed signal decoupling method and system based on a multi-core optical fiber. According to the method, temperature and pressure mixed signals are synchronously acquired through phase difference data of a plurality of fiber cores, and multi-channel mixed sensing signals are generated; performing mechanical stress suppression on the multi-core optical fiber by using a thermal expansion adaptive packaging structure to form an anti-deformation optical fiber assembly; carrying out adaptive time slot distribution on the mixed sensing signal based on a time division multiplexing time sequence to generate a synchronous calibration signal; spectral features of the synchronous calibration signals are separated through the spectral analysis technology, scanning parameters are dynamically adjusted in combination with the temperature change rate and the deformation quantity, and temperature and pressure feature data are extracted; and performing decoupling operation on the feature data through the coupling model, and dynamically correcting the model parameter weight based on the deformation quantity feedback data to obtain a temperature parameter and a pressure parameter. According to the invention, the accuracy of synchronous decoupling measurement of temperature and pressure in a high-low temperature alternating environment is realized.

The invention discloses a signal-to-noise ratio improvement method based on a multi-core optical fiber dual-channel distributed acoustic sensing system, and the method comprises the steps: carrying out the light splitting of light emitted by a narrow linewidth laser through a first coupler C1, enabling one path of light to generate a pulse signal through an acoustic optical modulator (AOM), enabling the other path of light to pass through a second coupler C2, and enabling the other path of light to pass through a second coupler C1; the pulse light is divided into two beams of transmission light, the two beams of transmission light are injected into a connected sensing optical fiber through two groups of erbium-doped optical fiber amplifiers (EDFA), two groups of filters, two groups of circulators and a fan-in coupler Fan-in Coupler, and the pulse light is subjected to backward Rayleigh scattering in the sensing optical fiber; based on a dual-channel DAS system, a multi-core optical fiber is used as a sensing optical fiber, three cores and four cores of the multi-core optical fiber are connected in series to form two sensing channels, seven-core space division signals are multiplexed, the equivalent self-noise pressure suppression effect of the seven-core space division signals is analyzed, after noise correlation is removed through a time domain dislocation-frequency domain phase shift method, the signal-to-noise ratio gain can be increased to 8.65 dB, and the signal-to-noise ratio gain can be increased to 8.65 dB. And the detection capability of the system on low-frequency weak signals can be improved.

The invention discloses an equivalent self-noise pressure suppression method and device based on a multi-core optical fiber space division multiplexing signal, light emitted by a narrow linewidth laser is split through a first coupler C1, one path of light passes through an acousto-optic modulator AOM to generate a pulse signal, and then the pulse signal passes through a second coupler C2 to generate a pulse signal; the pulse light is divided into two beams of transmission light, the two beams of transmission light are injected into a connected sensing optical fiber through two groups of erbium-doped optical fiber amplifiers (EDFA), two groups of filters, two groups of circulators and a fan-in coupler Fan-in Coupler, and the pulse light is subjected to backward Rayleigh scattering in the sensing optical fiber; based on the dual-channel DAS system, the multi-core optical fiber serves as the sensing optical fiber, three cores and four cores of the multi-core optical fiber are connected in series to form two sensing channels, seven-core space division signals are multiplexed, the equivalent self-noise suppression effect of the seven-core space division signals is analyzed, and the detection capacity of the system for low-frequency weak signals can be improved.

The invention discloses a multi-core optical fiber multichannel demodulation system for three-dimensional displacement measurement of a mechanical oscillator, which comprises a light source module, a multi-core optical fiber sensing probe, a photoelectric detection module and a signal processing module. A mapping model between multi-channel optical signals and displacement is established, decoupling and high-precision measurement of three-dimensional displacement are realized through a matrix demodulation algorithm, the system takes a multi-core optical fiber as an integrated probe structure, free space optical path alignment is not needed, an optical path is stable, and packaging is simple and convenient; compared with a traditional single-core optical fiber displacement sensing scheme, displacement components of the mechanical oscillator in the three orthogonal directions can be obtained at the same time, and the method has the advantages of being high in measurement precision, high in anti-interference capacity, good in real-time performance, compact in system structure and the like and can be widely applied to the fields of mechanical oscillator displacement measurement, structure health monitoring, precision manufacturing, micro-nano operation positioning and the like.

The invention discloses a parallel imaging OCT (Optical Coherence Tomography) system based on a metasurface area array, which relates to the technical field of medical instruments, is small in size and can realize intraocular single-shot area array imaging and a three-dimensional position depth perception function by using metasurface and optical coherence tomography imaging information in a sample tissue with a limited size. According to the technical scheme, a light beam emitted by a laser is divided into two paths through a beam splitter, and the two paths enter a sample arm module and a reference arm module respectively; the sample arm module is a probe and comprises a multi-core optical fiber and a first metasurface; the reference arm module comprises a collimator, a motor and a right-angle reflector; the probe enters a sample tissue, a light beam is focused on the sample tissue and then is backscattered, the backscattered light beam reversely passes through the first metasurface, the multi-core optical fiber, the beam splitter, the second metasurface, the third lens, the grating and the focusing lens and then forms a spectral line beam on the CCD sensor, and the computer reads a signal from the CCD sensor and performs three-dimensional reconstruction imaging on the sample tissue.

A system and method directed to detecting placement of a medical device within a patient body, the system including a medical device including a multi-core optical fiber having a plurality of core fibers. Each of the plurality of core fibers can include a plurality of sensors each configured to reflect a light signal having an altered characteristic due to strain experienced by the multi-core optical fiber. The system can further include logic configured to determine a 3D shape of the medical device in accordance with the strain of the optical fiber. The logic can be configured to define a reference plane for the 3D shape and render an image of the 3D shape on a display of the system in accordance with the reference plane.

A multicore optical fiber (MCF) according to one embodiment of the present invention enables stable core identification. The MCF comprises a glass optical fiber and a resin coating. The glass optical fiber includes a plurality of cores, a marker, and cladding. On a cross-section of the MCF, the arrangement of the centers of the cores and the center of the marker has no rotational symmetry with respect to the center of the cross-section. The cladding includes an inner cladding that surrounds the cores and the marker, and an outer cladding that is provided on the outer peripheral surface of the inner cladding and has a refractive index higher than that of the inner cladding.

The invention discloses a multi-core all-solid-state anti-resonance optical fiber and a multi-wavelength optical fiber laser system. The multi-core all-solid-state anti-resonance optical fiber comprises an inner cladding area, at least two fiber core structures arranged in the inner cladding area and an outer cladding area or a coating layer area arranged on the periphery of the inner cladding area. Each fiber core structure comprises a fiber core area and an anti-resonance area, the anti-resonance area is composed of at least one capillary tube group, each capillary tube group comprises a plurality of capillary tubes, and the capillary tubes in each capillary tube group are annularly arranged on the periphery of the fiber core area by taking the fiber core area as the center; the optical fiber matrixes filled in the capillaries in the anti-resonance area are the same, and the refractive index of the anti-resonance area is n3gt; the refractive index n2 of the inner cladding region is equal to the refractive index n1gt of the fiber core region; and the refractive index of the outer cladding region or the coating layer region is n4. The optical fiber provided by the invention is beneficial to high-density integration of a fiber core structure in a multi-core optical fiber, has a large mode field area and a high-order mode rejection ratio, and gives consideration to both high power and high light beam quality.

The invention discloses a dynamic submarine cable three-dimensional reconstruction method and device, electronic equipment and a storage medium, which are used for solving the technical problem of failure of three-dimensional reconstruction of a dynamic cable caused by low shape sensing accuracy and stability of the dynamic submarine cable in the prior art. The method comprises the following steps: firstly, calculating a strain value of each fiber core in the multi-core optical fiber based on spectral drift, and performing characteristic curvature vector inverse solution by combining the strain value of each fiber core to obtain a discrete bending direction set and a discrete curvature set; respectively carrying out discrete fitting on the discrete bending direction set and the discrete curvature set until the bending direction and the optical fiber curvature at each position in the multi-core optical fiber are fitted; the optical fiber torsion is solved according to the bending direction, a space curve is solved based on the optical fiber curvature and the optical fiber torsion, and the space curve corresponds to the axis track of the multi-core optical fiber; and finally, performing three-dimensional reconstruction on the submarine cable according to the axis track to obtain the three-dimensional shape of the submarine cable.

A system, apparatus and method directed to detecting malposition of a medical device within a vessel of a patient, such as an Azygos vein. The medical device can include a multi-core optical fiber including a plurality of core fibers, where each of the plurality of core fibers includes a plurality of sensors is configured to reflect a light signal based on received incident light, and change a characteristic of the reflected light signal for use in determining a physical state of the multi-core optical fiber. The system can include a console having non-transitory computer-readable medium storing logic that, when executed, causes operations of providing a broadband incident light signal to the multi-core optical fiber, receiving reflected light signals, processing the reflected light signals, and determining whether the medical device has entered the Azygos vein of the patient based on the reflected light signals.

The invention provides a shape determination method, which comprises the following steps that: under the condition that a multi-core optical fiber transmits an optical signal, a first central wavelength variation of a first fiber core and a second central wavelength variation of a second fiber core are obtained, the first central wavelength variation reflects the temperature change of the first fiber core, and the second central wavelength variation reflects the temperature change of the second fiber core; the second central wavelength variation reflects the shape change of the second fiber core; compensating a second central wavelength variable quantity of the second fiber core according to the first central wavelength variable quantity of the first fiber core to obtain a target central wavelength variable quantity of the second fiber core, the target central wavelength variable quantity reflecting stress borne by the second fiber core when the shape of the second fiber core is changed; and performing shape construction on the to-be-measured area according to the target center wavelength variable quantity to obtain a target shape of the to-be-measured area. The invention further provides a multi-core optical fiber, electronic equipment and a computer readable medium.

The invention discloses an equivalent self-noise pressure suppression method based on a dual-channel distributed acoustic sensing system, and the method comprises the steps: carrying out the light splitting of light emitted by a narrow-linewidth laser through a first coupler C1, enabling one path of light to generate a pulse signal through an acoustic optical modulator (AOM), enabling the other path of light to pass through a second coupler C2, and enabling the other path of light to pass through a second coupler C1; the pulse light is divided into two beams of transmission light, the two beams of transmission light are injected into a connected sensing optical fiber through two groups of erbium-doped optical fiber amplifiers (EDFA), two groups of filters, two groups of circulators and a fan-in coupler Fan-in Coupler, and the pulse light is subjected to backward Rayleigh scattering in the sensing optical fiber; according to the invention, based on a dual-channel DAS system, two fiber cores of the multi-core optical fiber are used as sensing optical fibers, and the space division signals of the two cores are multiplexed, so that the performance that the equivalent self-noise pressure drop is 2.54 dB in the frequency band of 100-1000Hz is realized under the condition that the noise correlation coefficient of the dual-core signals is 0.11, and the detection capability of the system on low-frequency weak signals can be improved.

Provided is a multi-core fiber having an end surface whose inclination direction is appropriately set in consideration of connection. In a multi-core fiber (MF), inclination directions (v1, v2) of a first end surface (σ1) and a second end surface (σ2) are set so that, in a case where the first end surface (σ1) and the second end surface (σ2) are brought into contact with each other so as to minimize an angle made by an extending direction of cores (a1 to an) in the first end surface (σ1) and an extending direction of cores (a1 to an) in the second end surface (σ2), each of the cores (a1 to an) in the first end surface (σ1) at least partially overlaps any of the cores (a1 to an) in the second end surface (σ2).

The invention relates to the technical field of optical fiber performance analysis, in particular to a multi-core fiber grating multi-parameter decoupling method based on improved CNN-LSTM. According to the method, a multi-core fiber grating temperature, vibration and three-dimensional deformation detection system is built, center wavelength data under the action of different physical loads are collected, and the center wavelength data are matched with corresponding real physical quantities to build a supervised learning data set. After abnormal value elimination, filtering noise reduction and normalization processing are carried out on collected signals, stratified sampling and data enhancement are adopted to construct a training set and a test set. An improved CNN-LSTM model is established, multi-parameter nonlinear mapping and feature focusing are realized in combination with convolutional feature extraction, time sequence modeling and an attention mechanism, training is performed by taking RMSE as a loss function and an Adam optimizer, and an early stop mechanism is set to prevent overfitting. After training is completed, wavelength data to be measured are input into the model, and temperature, vibration and three-dimensional deformation results after decoupling can be output.

A system, apparatus and method directed to placing a medical device into a body of a patient, including performing operations of providing a broadband incident light signal to a plurality of core fibers of a multi-core optical fiber, receiving reflected light signals of different wavelengths, and processing the reflected light signals associated with the plurality of core fibers to determine (i) a physical state of the multi-core optical fiber relating to the medical device including the multi-core optical fiber, and (ii) an orientation of the multi-core optical fiber relative to a reference frame of the body. Additional operations include generating a display illustrating the physical state of the multi-core optical fiber based at least on the orientation determined during processing of the reflected light. Typically, the display is a two-dimensional representation of the multi-core optical fiber in accordance with the determined orientation.

The invention provides a multi-core fiber grating array preparation and multi-parameter sensing method based on a free core aiming at the cross sensitive effect of temperature and strain of a multi-core fiber in the detection process of multiple parameters such as temperature, strain and shape. The multi-core fiber grating array based on the free core is formed by compounding a plurality of grating array optical fibers which are integrally prepared on line by a wire drawing tower, and a loose tube is sleeved outside the grating array optical fiber at the central fiber core position on a neutral surface to form a free core state. The free core fiber bragg grating array is not affected by stress in actual monitoring, single parameter measurement of temperature can be achieved, temperature compensation of other fiber cores can be achieved through the free core fiber bragg grating array, and the cross sensitive effect of temperature and strain is effectively restrained. Through the multi-core fiber grating array based on the free core, simultaneous monitoring of multiple parameters such as temperature, strain and shape can be realized, the monitoring precision is high, and the shape reconstruction effect is good.

The invention provides a nonlinear torsion compensation method and calibration device for spiral multi-core optical fiber shape sensing, and belongs to the field of optical fiber shape sensing. The method comprises the following steps: firstly, acquiring the total strain of the spiral multi-core optical fiber when the spiral multi-core optical fiber is bent and twisted through an optical frequency reflectometer; then the bending curvature, the torsional strain and the strain noise of the optical fiber to be measured are obtained according to the total strain decoupling principle; applying different torsion rates, and demodulating the torsion strain corresponding to the spiral multi-core optical fiber; then, according to the theoretical model of the spiral optical fiber subjected to external torsion, the torsion sensitivity is solved by using an iterative algorithm; and finally, fitting by utilizing the linear relationship between the torsion sensitivity and the torsion rate to obtain the nonlinear relationship between the torsion strain and the torsion rate, and further performing nonlinear torsion compensation on the bending angle in shape reconstruction. According to the method, good curve reconstruction performance can be obtained, and particularly, the reconstruction precision can be obviously improved under the condition that the optical fiber is twisted and bent at the same time.

An MCF includes a plurality of cores each extending in a direction along a central axis and a cladding covering each of the plurality of cores. The cladding includes a low refractive index barrier. The low refractive index barrier includes an alkali metal element. A relative refractive index of the low refractive index barrier is lower than an average value of a relative refractive indices of the cladding overall. The core interval is set such that a total sum of the power coupling coefficients between a specific core among the plurality of cores and each of all remaining cores is 2.3×10−4 / km or less.

The invention discloses a bending sensor based on a random coupling multi-core optical fiber and a sensing method thereof. The bending sensor realizes bending sensing based on the inter-core coupling characteristic of the random coupling multi-core optical fiber. The inter-core coupling frequency spectrum of the random coupling multi-core optical fiber shows higher sensitivity to the bending change of the optical fiber, and high-resolution curvature sensing can be realized by detecting the frequency spectrum information of the random coupling multi-core optical fiber. Besides, frequency and light intensity information in a plurality of fiber cores can be monitored at the same time by utilizing a plurality of channels and fan-in and fan-out devices of the randomly coupled multi-core optical fiber, so that bending direction identification is realized with a higher integration level. The coupling characteristic of the random coupling multi-core optical fiber is used for sensing, compared with an existing optical fiber interferometer and grating type devices, the sensor is simple in structure, a sensing system does not need complex equipment, and therefore the manufacturing and testing cost of the sensor can be reduced.

The utility model relates to the technical field of optical fiber conduction, and discloses a receiver assembly which is used for butting a connector with a multi-core optical fiber, butting sections of a plurality of single-core optical fibers are combined and arranged in an insertion core through hole formed in a receiver insertion core part, and are aligned and fixed with the receiver insertion core part used for butting a connector insertion core; the receiver insertion core piece is fixedly arranged in the adjusting piece, an adjusting through hole is formed in the receiver shell, the adjusting through hole and the insertion core through hole are coaxial, the adjusting piece is arranged in the adjusting through hole, so that the receiver insertion core piece is arranged in the adjusting through hole in a penetrating mode, and the adjusting piece and the receiver shell can selectively, coaxially and relatively rotate; the receiver assembly is assembled in advance and then is in butt joint with the connector. The adjusting piece can adjust the fiber cores of the multiple single-core optical fibers to be aligned with the fiber cores of the multi-core optical fibers one by one. And after the receiver assembly is adjusted to a correct angle, the relative positions of the adjusting piece and the receiver shell are fixed, so that the receiver assembly is simpler and more compact in structure, and the space of butt joint action can be saved.

A multi-core optical fiber includes four cores each extending along a center axis of the multi-core optical fiber, common cladding enclosing the four cores and having a lower refractive index than each of the four cores and coating resin enclosing the common cladding. The common cladding has a diameter of 124.5 μm to 125.5 μm. For each of the four cores, letting an effective area at a wavelength of 1550 nm be Aeff [μm2] and a cable cutoff wavelength be λcc [μm], Aeff satisfies Expression (1) and Expression (2) while λcc satisfies Expression (1) and Expression (3). The four cores are arranged such that Dc satisfies Expression (4) in relation to Aeff and λcc of each of the first core and the second core while OCT, Aeff, and λcc of the first core satisfy Expression (5).

The invention discloses a non-destructive and high-precision testing and calibrating device and method for internal geometric parameters of a multi-core optical fiber. The device comprises a two-dimensional arc groove testing mold, a first rotating clamp, a second rotating clamp, a fan-in and fan-out device, an optical switch, an optical frequency domain reflectometer and data collecting and processing equipment. By embedding the to-be-measured multi-core optical fiber into the groove with the known curvature and combining the distributed strain demodulation technology, the distributed strain distribution in the bending state is directly measured, and the distributed strain distribution in the bending state is directly measured through a mathematical model of the bending-torsion composite action and a cosine function fitting algorithm without cutting or damaging the optical fiber structure. And synchronously calculating the torsion period, the core spacing and the core included angle. The method overcomes the defects that a traditional microscope method depends on end face preparation and destructive detection, realizes on-line measurement of all-fiber length, can adapt to multi-core fibers with different core numbers and cladding structures, and can be expanded to high-precision industrial scenes such as fiber-optic gyroscope calibration, flexible conduit morphology monitoring, submarine optical cable process optimization and the like.

The present invention relates to the field of communication and sensing, and specifically to a communication and sensing integrated device based on a seven-core optical fiber interferometer and an application method therefor. The application method comprises: a first beam splitter splitting, into reference light and signal light, a light source emitted by a narrow linewidth laser; performing modulation by means of a first coherent optical transmitter and a second coherent optical transmitter; amplifying the light by means of a first amplifier and a second amplifier, and then enabling the light to pass through a multi-core optical fiber from a fan-in end, and to output from a fan-out end; performing beam splitting by means of a second beam splitter and a third beam splitter, and performing demodulation by means of a first coherent receiver and a second coherent receiver; and finally, a phase-locked loop performing interference elimination on preliminarily-demodulated reference light and preliminarily-demodulated signal light to obtain finally-demodulated reference light and finally-demodulated signal light. The present invention uses a phase-locked loop to further eliminate disturbance noise of reference light and signal light. Therefore, noise interference is eliminated in continuous low-frequency detection, thereby improving the communication and sensing effect.

The invention discloses a distributed optical fiber two-dimensional vector sensing system and method, the system uses an acousto-optic modulator group and an optical circulator group to ask a plurality of fiber cores of a multi-core optical fiber in parallel, heterodyne coherent detection uses local oscillator light to improve the signal-to-noise ratio, and through the relation between the fiber core position difference and the direction angle of a two-dimensional sound wave in the aspect of algorithm, the two-dimensional sound wave direction angle is obtained. According to the space division multiplexing distributed optical fiber acoustic sensing system, a two-dimensional vector signal is accurately restored, the measurement vector angle range of the space division multiplexing distributed optical fiber acoustic sensing system for two-dimensional sound waves is 0-360 degrees, the vector sensing range is larger than 50 km and far exceeds that of an existing system, and the detection capacity of the distributed optical fiber acoustic sensing system is greatly improved.

The invention discloses a system for simultaneously measuring temperature and pressure based on forward Brillouin scattering in a multi-core optical fiber, which relates to the technical field of optical fiber temperature and pressure double-parameter sensors, and is characterized in that light emitted by a pump light source enters a polarization controller after being modulated by a pump light modulation system, and then enters an erbium-doped optical fiber amplifier; one part is injected into a Sagnac ring, and the other part excites a high-order torsion-radial mode through a multi-core optical fiber; light emitted by the detection light source is divided into light beams transmitted in the clockwise direction and the anticlockwise direction through the coupler, and the light beams are injected into the Sagnac ring; the spectrum analyzer captures the frequency shift of the Brillouin scattering signal; the signal processing unit processes the frequency shift of the Brillouin scattering signal and inverts temperature and strain data; and the data analysis and feedback system is combined with machine learning to optimize temperature and strain data. According to the invention, high-sensitivity temperature and strain sensing is realized.