286 results about "Multi core fiber" patented technology

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.

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.

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 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.

The invention belongs to the related technical field of sensors, and provides a multi-parameter integrated acquisition optical fiber sensor and a monitoring system thereof in order to solve the problem that high-precision monitoring of a static signal and a dynamic signal is difficult to consider by an existing sensor at the same time, a sensing cavity is sequentially divided into a static signal sensing area and a dynamic signal sensing area in the axial direction; the static signal sensing area adopts a multi-core fiber, fiber gratings are respectively engraved on the multi-core fiber, and the wavelength demodulation of the static signal is realized through the central wavelength drift distance of the fiber gratings; the dynamic signal sensing area is provided with a dynamic signal sensing unit, the dynamic signal sensing unit comprises F-P air microcavities formed between the dynamic signal sensing unit and the end faces of all fiber cores of the multi-core optical fiber, and intensity demodulation of dynamic signals is achieved through cavity length changes of the F-P air microcavities. According to the invention, a wavelength modulation and intensity modulation parallel composite demodulation mechanism is adopted, and decoupling acquisition of static strain, temperature and dynamic vibration is realized in a single sensor.

The invention provides a multi-core optical fiber, a parallel optical transmission optical module and an optical interconnection system, which can solve the problem of high operation and maintenance cost caused by coexistence of PSM and WDM optical modules and non-uniform optical module interface and optical fiber wiring in the prior art, the multi-core optical fiber comprises a multi-core optical fiber, the size of a central fiber core is the same as that of a single-mode optical fiber, and the optical interconnection system comprises a single-mode optical fiber and a single-mode optical fiber. The wavelength division multiplexing module is used for transmitting wavelength division multiplexing optical signals; the plurality of peripheral fiber cores are arranged around the central fiber core and are used for transmitting multiple paths of parallel optical signals; an optical interface of the parallel optical transmission optical module is connected with a peripheral fiber core of the multi-core optical fiber, and the parallel optical transmission optical module is used for transmitting multiple paths of parallel optical signals through the peripheral fiber core; the wavelength division multiplexing optical module is provided with a single-channel optical interface, and the single-channel optical interface is connected with the central fiber core of the multi-core optical fiber and used for transmitting wavelength division multiplexing optical signals through the central fiber core.

The present invention relates to the technical field of optical fiber sensing. Disclosed are a multi-core grating sensor and a manufacturing method therefor, and a permafrost monitoring method. The multi-core grating sensor comprises a multi-core optical fiber grating, a strain gauge structure, and a demodulator, and the multi-core optical fiber grating comprises four uniformly and symmetrically distributed single-mode optical fibers, a cladding layer wrapping the four single-mode optical fibers, and a coating layer located between the single-mode optical fibers and the cladding layer; the strain gauge structure is attached to the outside of the multi-core optical fiber grating by means of glue bonding; and the demodulator is used for monitoring the dynamic change of the wavelength of the multi-core optical fiber grating, the demodulator comprises a broadband light source and a spectrum analyzer, an incident end of the multi-core optical fiber grating is connected to the broadband light source by means of the single-mode optical fibers, and an exit end thereof is connected to the spectrum analyzer by means of the single-mode optical fibers. Also disclosed in the present invention is a permafrost monitoring method. By means of comprehensive analysis and demodulation of fiber core wavelength variation amounts of a plurality of single-mode optical fibers on a single multi-core optical fiber grating, simultaneous measurement of multiple parameters is achieved, and the permafrost monitoring accuracy is improved.

The invention provides a multi-core optical fiber tunable structure and a preparation method thereof, and relates to the technical field of photonic devices. The multi-core optical fiber tunable structure comprises a fan-in and fan-out module, a section of multi-core optical fiber and at least two Fabry-Perot interference cavities; the physical cavity lengths of the at least two Fabry-Perot interference cavities are different from each other; the multi-core optical fiber is provided with a first end face and a second end face, and the multi-core optical fiber comprises at least two fiber cores; the at least two Fabry-Perot interference cavities and the at least two fiber cores are arranged in a one-to-one correspondence manner; each Fabry-Perot interference cavity comprises a first reflecting surface and a second reflecting surface; and the first reflecting surface is an end surface of the fiber core corresponding to the Fabry-Perot interference cavity at the second end surface of the multi-core optical fiber. On the basis, the problems that an existing discrete integrated multi-channel tuning structure is complex in structure, high in insertion loss, low in reliability and high in cost and packaging difficulty are solved.

1. The name of the design product: multi-core fiber ribbonizer. 2. The use of the design product: used in optical fiber laser, submarine cable, optical migration sensor, petrochemical optical fiber, medical optical fiber, optical module ribbonizer. 3. The design points of the design product: in shape. 4. The picture or photo that best shows the design points: perspective view 1.

A distributed reconfigurable switching node for a multi-core optical fiber is disclosed. A method and system for transmission of optical signals. The system includes one or more first switching optical devices configured to switch transmission of one or more optical signals from one or more first fiber cores to one or more second fiber cores. It includes one or more second switching optical devices configured to pass transmission of one or more optical signals from one or more first fiber cores to one or more third fiber cores.

A multi-core fiber includes a cladding, cores extending in an extending direction inside the cladding, a marker inside the cladding, and an end surface inclined in an inclined direction that is not orthogonal to the extending direction. The cores at the end surface are line-symmetrically arranged with respect to a virtual axis orthogonal to the inclination direction. The virtual axis virtually divides the end surface into a first area and a second area. The cores include a first core disposed farthest from the virtual axis in the first area and a second core disposed farthest from the virtual axis in the second area. A center of the marker at the end surface is disposed in an area between a straight line, passing through the first core, parallel to the virtual axis and a straight line, passing through the second core, parallel to the virtual axis.

The invention discloses a belt conveyor safety online monitoring method and device, a medium and a product, and relates to the field of belt conveyor safety monitoring, and the method comprises the steps: collecting a multi-vibration-source signal and a temperature signal of a belt conveyor through a vibration reduction and sensitization acoustic vibration optical cable device; the vibration reduction and sensitization acoustic vibration optical cable device is of a multi-core optical fiber spiral winding structure, and a gradient vibration reduction layer is integrated on the outer layer. Sequentially carrying out wavelet packet decomposition, blind source separation and deep learning optimization on the multi-vibration-source signal, and determining a single-vibration-source signal corresponding to each part; performing time synchronization on the single vibration source signal and the corresponding temperature signal by adopting a dual-optical fiber redundant link and an optical fiber gyroscope; and performing multi-source data fusion diagnosis by adopting a D-S evidence theory according to the synchronized single vibration source signal and the corresponding temperature signal in combination with a sound signal, and generating a fault early warning signal. The distributed optical fiber monitoring accuracy and stability of the belt conveyor can be improved.

Intensity control units 40A and 40B acquire the intensity of backscattered light when inputting signal light of two or more modes for each core in a multicore optical fiber 10, which has two or more cores and in which two or more modes propagate to each of the cores, so that the transmission direction of light differs between adjacent cores, and output a control signal for reducing the input optical power of a high-order mode other than a basic mode of the signal light by a predetermined amount so as to reduce the influence of the high-order mode on the basic mode.

The invention relates to the technical field of optical fiber connectors, and provides a multi-core optical fiber connector and a processing method thereof, and the multi-core optical fiber connector comprises a multi-core tail handle optical fiber, a reference base, a PIN base and at least two PINs. The multi-core tail handle optical fiber comprises a connector insertion core; the reference base is positioned and connected to one side of the multi-core tail handle optical fiber, and the reference base is provided with at least two first coupling alignment reference holes; the PIN is arranged on the PIN base and connected with the PIN base, the PIN base is arranged on the other side of the multi-core tail handle optical fiber, the PIN penetrates through the first coupling alignment reference hole, and the free end of the PIN is used for being in positioning connection with a second coupling alignment reference hole in an external multi-core optical fiber interface assembly. And the connector insertion core is coupled and aligned with the interface insertion core of the multi-core optical fiber interface assembly. According to the invention, high-precision alignment connection is realized, stable transmission is further realized, and the connection problem of the jumper wire of the multi-core optical fiber connector is solved by matching with the multi-core optical fiber interface assembly.

A multicore optical fiber may include a common cladding comprising a radius R4 defining a glass portion of the optical fiber and having a cladding relative refractive index Δ4. At least two waveguides may extend through the common cladding. Each waveguide may include a core region, an inner cladding region, and a depressed cladding region. Each core region may include a maximum relative refractive index Δ1max. Each inner cladding region may include a relative refractive index Δ2. Each depressed cladding region may include a minimum relative refractive index Δ3min and a trench volume from 20-45%µm2 such that Δ1max>Δ2>Δ3min, and Δ4>Δ3min. A cable cutoff wavelength of each waveguide is ≤1150 nm. The co-propagating and counter-propagating inter-waveguide cross talk between each waveguide and a nearest waveguide is <-35 dB at 1310 nm and <-20 dB at 1550 nm for application lengths of 20 m. A mode field diameter of each waveguide is 8.2-9.0 µm at 1310 nm.

The invention discloses a system for improving the precision of film thickness measurement by a reflection spectrometry, which is characterized by comprising a white light source for emitting light in a wide spectral range; the main spectrograph is used for measuring the reflection spectrum of the measured object; the monitoring spectrometer is used for monitoring the spectral intensity of the light source in real time; the optical fiber assembly comprises a multi-core optical fiber and a single-core optical fiber and is used for conducting light from the light source to a measured object and conducting reflected light to the main spectrograph; and the data processing unit is used for calibrating the incident light intensity in real time according to the data of the main spectrograph and the monitoring spectrograph and calculating the thickness of the thin film. According to the system for improving the precision of measuring the thickness of the thin film through the reflection spectrum method, the repeatability precision of measurement and the stability of long-term measurement are improved.

The application provides a multi-core optical fiber tunable structure and a preparation method thereof, and relates to the technical field of photonic devices. The multi-core optical fiber tunable structure comprises a fan-in fan-out module, a section of multi-core optical fiber and at least two Fabry-Perot interference cavities; the physical cavity lengths of the at least two Fabry-Perot interference cavities are different from each other; the multi-core optical fiber has a first end face and a second end face, and the multi-core optical fiber comprises at least two fiber cores; the at least two Fabry-Perot interference cavities are arranged in one-to-one correspondence with the at least two fiber cores; each Fabry-Perot interference cavity comprises a first reflecting face and a second reflecting face; the first reflecting face is an end face of the fiber core corresponding to the Fabry-Perot interference cavity at the second end face of the multi-core optical fiber. Based on this, the application solves the problems of complex structure, high insertion loss, low reliability, high cost and high packaging difficulty of the existing discrete integrated multi-channel tuning structure.

The utility model discloses a multi-core optical fiber integrated joint and a bearing bush temperature touch sensor detection device. The multi-core optical fiber integrated joint comprises a plurality of optical fiber joints, a multi-core joint and a locker, the multi-core joint is provided with a plurality of fourth through holes connected with the optical fiber joints, and the fourth through holes penetrate through the multi-core joint; an optical fiber ferrule is arranged in a first through hole of the optical fiber connector, the optical fiber ferrule is communicated with an optical fiber core optical path in a second through hole, and one end, far away from the second through hole, of the optical fiber ferrule extends out of a connector body of the optical fiber connector by a preset length; and the locking device is detachably connected with the connecting end of the multi-core joint and the optical fiber joint in a sealing manner. Accurate monitoring of the temperature of multiple feature positions of the generator bearing bush is achieved, a multi-core optical fiber integrated connector and a distributed temperature sensing network are organically combined, and a complete temperature field monitoring system is constructed by arranging special temperature sensors at key positions of the bearing bush.

The application belongs to the technical field of passive optical devices, and discloses a multi-core optical fiber multiplexer / demultiplexer and a preparation method thereof. In the application, a small outer diameter optical fiber is fused at one end of a single-mode optical fiber. The cladding diameter of the small outer diameter optical fiber is smaller than the cladding diameter of the single-mode optical fiber, and the cladding diameter of the small outer diameter optical fiber is equal to the core spacing of the multi-core optical fiber to be matched. The mode field diameter of the small outer diameter optical fiber is consistent with the mode field diameter of each core of the multi-core optical fiber. The small outer diameter optical fiber is used as a transition optical fiber between the single-mode optical fiber and the multi-core optical fiber, high-precision matching between the single-mode optical fiber and the multi-core optical fiber is achieved, the problems existing in the prior art preparation method can be avoided, and the application has the advantages of good scalability, simple preparation, high precision, and industrial mass production.

A medical device that functions as a stylet is described. The medical device can include an insulating layer (or jacket) that encapsulates both a multicore 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 the corresponding core fiber, and each of the sensors can be configured to: (i) reflect light signals having different spectral widths based on received incident light, and (ii) alter a characteristic of the reflected light signals for determining a physical state of the multicore optical fiber. The conductive medium can provide a path for electrical signals detected at a distal portion of the conductive medium. The conductive medium can be concentric with the cladding, but can be separate from and adjusted to the cladding.

The application belongs to the technical field of passive optical devices, and discloses a multiplexer / demultiplexer suitable for a multi-core optical fiber and a preparation method thereof. In the application, a small outer diameter optical fiber is fused at one end of a single-mode optical fiber. The cladding diameter of the small outer diameter optical fiber is smaller than the cladding diameter of the single-mode optical fiber, and the cladding diameter of the small outer diameter optical fiber is equal to the core spacing of the multi-core optical fiber to be matched. The mode field diameter of the small outer diameter optical fiber is consistent with the mode field diameter of each core of the multi-core optical fiber. The small outer diameter optical fiber is used as a transition optical fiber between the single-mode optical fiber and the multi-core optical fiber, high-precision matching between the single-mode optical fiber and the multi-core optical fiber is realized, the problems existing in the prior art preparation method can be avoided, and the application has the advantages of good scalability, simple preparation, high precision, and industrialized mass production.

A multi-core optical fiber pressure sensor is used for improving the dynamic response and precision of the sensor. The multi-core optical fiber pressure sensor comprises a main body, a central optical fiber hole, an optical fiber circular hole array, a multi-core optical fiber and an elastic film, the main body is a spiral regular hexagon, has a regular hexagon section, and rotationally extends along the central axis of the main body; the central optical fiber hole is in a regular pentagram shape, has a regular pentagram-shaped section, is positioned in the center of the main body and extends along the central axis of the main body; the optical fiber circular hole array is located on the peripheral side of the central optical fiber hole and comprises a plurality of optical fiber circular hole rows arranged from the inner peripheral side to the outer peripheral side, a plurality of optical fiber circular holes in each optical fiber circular hole row are circumferentially and uniformly distributed around the central axis of the main body, each optical fiber circular hole extends along the central axis of the main body, and the optical fiber circular hole array is in central symmetry about the central axis of the main body; the multi-core optical fiber is arranged in the central optical fiber hole and each optical fiber circular hole; the elastic film covers the main body, the central optical fiber hole, the optical fiber circular hole array and the end face of the multi-core optical fiber.

A multi-fiber ferrule has a main body with a top portion and a bottom portion, the top portion includes a top cut-out therein to form a first forward facing surface to engage a housing of a fiber optic connector. The top cut-out extends rearwardly from the front end. The bottom portion also has a bottom cut-out portion forming a second forward facing surface to engage the housing of the fiber optic connector, the bottom cut-out also extending rearwardly from the front end. The multi-fiber ferrule also includes an end face at a front end of the main body, and a rear face at a rear end of the main body. There is a rear central opening that extends into the main body from the rear end face and configured to receive at least three optical fibers.

The invention relates to the technical field of optical fiber connectors, in particular to a multi-core optical fiber connector with an MT insertion core, which comprises an insertion core body, a first connector body and a second connector body, a first connecting part and a second connecting part are arranged at the two ends of the insertion core body, the first connector body and the second connector body are correspondingly provided with a first insertion table and a second insertion table, and the two insertion tables are provided with upper guide pins; the insertion core body is provided with an upper insertion channel and an upper guide hole, and the upper guide pin is inserted into the upper insertion channel through the upper guide hole; an upper communicating groove is formed in the top of the ferrule body, an upper sheath is movably assembled in a lifting mode, an upper lifting block is connected into the upper sheath through an upper pressing spring, an upper pressing block is hinged to the bottom of the upper lifting block, and a first upper pressing arm and a second upper pressing arm abut against the upper guide pin through the upper communicating groove. Through the elastic self-adaptive pressing structure, the problems of abrasion of the guide pin and reduction of the positioning precision caused by repeated plugging and unplugging of an existing connector are solved, and stable and reliable optical signal transmission is guaranteed.

Light amplification devices using coupled multi-core optical fibers have a figure of merit that temporally varies, which makes it difficult to perform performance evaluation and to build a light transmission system using the same. Accordingly, a light amplification device of the present invention comprises: a band control means that controls the wavelength band of a light carrier to generate a band control light; and a band control light amplification means that has a plurality of light amplification media through which the band control light propagates, wherein the band control light amplification means amplifies the band control light in a coupled state in which the light propagating through the plurality of light amplification media induces a crosstalk and wherein the band control means controls the wavelength band such that the band control light having propagated through the plurality of light amplification media has a reduced coherence.

An MCF of one embodiment combines the adoption of a plurality of cores with different refractive indices with suppression of manufacturing costs. The MCF has a glass optical fiber having a plurality of cores and a cladding, and a resin coating. The plurality of cores includes a first core with a high refractive index and a second core with a low refractive index. On a cross-section of the MCF, an arrangement of centers of a plurality of portions has no rotational symmetry about the cross-section center, the portions having a refractive index higher than that of the cladding. Furthermore, a mode leakage adjustment structure is provided to reduce a difference between a cutoff wavelength of a residual higher-order mode in the second core and a cutoff wavelength of a residual higher-order mode in the first core.