84 results about "Multicore fiber" patented technology

The present invention relates to an elongated device (10) for medical interventional application. The device comprises a multicore optical fiber (12) arranged for sensing shape, a longitudinal lumen (14) having a longitudinal axis and embedding the optical fiber (12), a shell (16) surrounding the lumen (14), the shell (16) having a main section (18) and a distal terminal section (20). The device (10) further comprises a mechanically bendable extension member (34) coupled to a distal ending portion (32) of the optical fiber (12), the extension member (34) longitudinally extending within the lumen (14) into the terminal section (20) of the shell (16). The extension member (34) is configured to transfer bending information related to a bending of the extension member (34) to the ending portion (32) of the optical fiber (12) such that the bending information is sensed by the optical fiber (12).

The utility model relates to the technical field of fiber bragg grating array manufacturing, in particular to a chiral multi-core fiber bragg grating array and a preparation device. The device is characterized by comprising a rotary fiber feeding module, a grating array fiber, a beam combining module, a coating cup and a fiber collecting device. The rotary fiber feeding module bears 1 + N grating array optical fibers, and the grating array optical fibers can select various indexes such as different grating wavelengths, intervals and reflectivity. In the preparation process of the chiral multi-core fiber bragg grating array, the rotary fiber feeding module and the beam combining module rotate at the same speed in the same direction to increase torsion for 1 + N grating array fibers so as to form the chiral multi-core fiber bragg grating array. According to the chiral multi-core fiber grating array and the preparation device, various indexes such as different grating wavelengths, intervals and reflectivity can be selected, screw pitches can be freely selected, and low-cost long-distance large-scale industrial preparation and torsion monitoring and shape sensing in complex strain conditions can be realized.

The utility model provides a double-color ultra-miniature microscopic imaging system, which solves the problem that the accuracy and effectiveness of data cannot be judged by the existing single-color fluorescence recording, and adopts the main scheme that the double-color ultra-miniature microscopic imaging system comprises a video acquisition card, a double-color ultra-miniature microscopic imaging mirror body, a multi-core optical fiber bundle, an LED (light-emitting diode) driving circuit, a digital signal acquisition card and a switching power supply, the video acquisition card is electrically connected with the LED driving circuit and can be communicated with computer acquisition software to distinguish odd frames and even frames by taking image frames as units and synchronously control corresponding light source signals, and the double-color ultra-miniature microscopic imaging mirror body is used for emitting two excitation lights and collecting and imaging fluorescence models. The multi-core optical fiber bundle is used for coupling two kinds of exciting light into a light source and connecting the light source to the two-color ultra-miniature microscopic imaging mirror body, and the LED driving circuit is used for receiving a control signal of the video acquisition card so as to realize synchronization of on-off of the exciting light and image frames.

The invention relates to an imaging system including: a medical endoscopic system including an insertion instrument provided with at least one multicore optical fiber, the distal end of which is located at the distal head of the insertion instrument, the proximal end of the multicore optical fiber being provided with an optical connector; a device for acquiring and processing images including: at least a first illumination source configured to deliver a light beam in at least a first wavelength spectrum, to the multicore optical fiber via the optical connector; at least one imaging sensor configured to receive a light beam coming from at least the proximal end of the multicore optical fiber; and an imaging processor connected to the imaging system and configured to form images of the target.

A method of manufacturing a multicore fiber preform includes providing first and second cylinders each extending longitudinally between opposing first and second ends, forming longitudinally extending first holes in the first cylinder and longitudinally extending second holes in the second cylinder, forming at least one first recess in the first end of the first cylinder such that the first holes each terminate at the first recess at a location axially spaced apart from the first end of the first cylinder; facing the first end of the first cylinder to the second end of the second cylinder and axially aligning each of the first holes with respective second holes, welding the first end of the first cylinder to the second end of the second cylinder, and for each first hole and its respective axially aligned second hole, inserting a respective core rod assembly.

A beam delivery system for a probe includes a plurality of laser sources configured to generate respective incident beams, the plurality of laser sources including a first laser source that generates a first incident beam and a second laser source that generates a second incident beam. The system includes routing structures respectively positioned along a path of a respective incident beam. The optical subsystem is adapted to sequentially direct the respective output beams from the routing structure into each core in a multi-core optical fiber in communication with the probe. The first routing structure and the second routing structure each comprise an array of optical elements adapted to move synchronously such that the first incident beam and the second incident beam concurrently encounter the same member in the array.

An optical connector for terminating a cable containing one or more multicore fibers. The connector has a plug housing, a ferrule disposed inside the housing, a rotatable frame, and a multicore fiber (MCF) stub having a length of a first MCF a portion of which is fixed inside the ferrule so that a first endface of the fiber is exposed at the front end of the ferrule. An opposite endface of the first MCF is cleaved for fusion splicing to a second MCF in the cable to be terminated. The ferrule also has a flange, and the frame is formed to engage the flange for rotation so that cores in the first MCF can be aligned and positioned in a prescribed orientation relative to the plug housing, and cores in the second MCF can be aligned with corresponding cores in the first MCF when the first and the second MCFs are fusion spliced to one another.

The invention discloses a 3D waveguide type multi-core optical fiber link monitor which comprises an optical chip platform with n layers of stacked waveguide structures and a photoelectric detector, n is larger than or equal to 2, and the number n of waveguide layers of the optical chip platform is equal to the number of layers of connected multi-core optical fibers. The cross section distribution of waveguides in the optical chip platform and the cross section distribution of fiber cores of the multi-core optical fiber are the same and are in one-to-one correspondence; a waveguide channel corresponding to each fiber core of the multi-core optical fiber in the optical chip platform comprises an optical fiber signal coupling fan-out module, an optical signal beam splitting module, an optical signal monitoring module and a multi-core optical fiber signal coupling fan-in module which are connected in sequence; after an optical signal of a multi-core optical fiber transmitting end is coupled by the fan-out module, a small part of the signal is separated by the beam splitting module through a waveguide coupling effect and is used for monitoring, and most of the signal is transmitted back to a transmission link through the fan-in module; and the monitoring module realizes real-time detection through a photoelectric detector. According to the invention, no extra optical fiber fan-in / fan-out module is needed, the insertion loss is low, and the device is not sensitive to polarization.

The utility model provides a gain flattening filter device for a multi-core optical fiber light amplification device, which comprises an input multi-core optical fiber, an input lens, an optical isolation system, a gain flattening filter plate, an output lens and an output multi-core optical fiber which are sequentially arranged along the direction of an optical path, the light passes through an optical isolation system, a gain flattening filter and an output lens in sequence and then is input to a second fiber core; each beam of light passing through the gain flattening filter and the optical axis form an emergent included angle theta, and the optical isolation system is used for isolating return light of the gain flattening filter. A light beam enters the gain flattening filter plate at an angle to ensure that interface reflected light can deviate from an inlet end collimator, so that return loss is ensured, pre-stage amplification is prevented from being influenced, meanwhile, the interface reflected light of the gain flattening filter plate is isolated by using an optical isolation system in a matched manner, normal operation of a pre-stage amplification system is ensured, and the integration of the devices is utilized. And miniaturization packaging can be facilitated.

A multicore fiber (10) is provided with a plurality of cores (11a)-(11d) and a cladding (12) that surrounds of the cores (11a)-(11d). The propagation loss of measurement light differs by 0.01 dB / km or more between a specific core (11a) and the other cores (11b)-(11d), the measurement light having a wavelength that is not higher a wavelength at which light in a mode that is by one order higher than a mode used in a communication wavelength band can propagate.

A method of manufacturing a multicore fiber preform includes providing first and second cylinders each extending longitudinally between opposing first and second ends, forming longitudinally extending first holes in the first cylinder and longitudinally extending second holes in the second cylinder, forming at least one first recess in the first end of the first cylinder such that the first holes each terminate at the first recess at a location axially spaced apart from the first end of the first cylinder; facing the first end of the first cylinder to the second end of the second cylinder and axially aligning each of the first holes with respective second holes, welding the first end of the first cylinder to the second end of the second cylinder, and for each first hole and its respective axially aligned second hole, inserting a respective core rod assembly.

Wavefront measurement of a multi-core optical fiber is described. A multi-core optical fiber is configured to conduct radiation from a radiation source to a structure, such as a metrology target, in one or more layers of a patterned substrate, and to conduct diffracted and / or reflected radiation from the metrology target to a radiation sensor. The multi-core optical fiber has a length configured to facilitate placement of the radiation source and / or the radiation sensor in spaced locations relative to the patterned substrate. Optical path length differences between sets of fiber cores with reflectors in the multi-core optical fiber are determined for radiation of different wavelengths from the radiation source. The optical path length difference is determined based on a path length of reflected radiation that is incident on the radiation sensor after returning through the core set. The optical path length difference indicates wavefront distortion.

This method of manufacturing a multicore optical fiber includes: a step for inserting multiple glass rods into multiple holes provided in a glass tube; a step for sealing a first end of the glass tube; and a step for decompressing the inside of the multiple holes from a second end of the glass tube and drawing the glass tube and the multiple glass rods while integrating same. When the cross-sectional area of the glass tube before the drawing step is defined as S1 [m2], the sum of the cross-sectional areas of the multiple glass rods before the drawing step is defined as S2 [m2], and the cross-sectional area of the multicore optical fiber after the drawing step is defined as S3 [m2], the inserting step is carried out so that the sum of the areas of gaps between the glass tube and the multiple glass rods before the drawing step in a cross-section orthogonal to the axial direction of the glass tube is equal to or less than (S1 + S2) / S3 × 5.66 × 10-4 [mm2], and the inserting step is carried out in an environment having cleanliness higher than class 1,000.

The marker position of the MCF is determined based on a side view of the MCF that has only one marker. [Solution] The determination system includes means for capturing a first image and a second image showing the brightness distribution of the side surface of the MCF when viewed in a first direction and a second direction; means for determining the first center position of the MCF based on the brightness distribution in the second direction and determining the second center position of the MCF based on the brightness distribution in the first direction; means for determining a first brightness difference, which is the difference in brightness between two positions that are equally far from the first center position, and a second brightness difference, which is the difference in brightness between two positions that are equally far from the second center position; and means for determining the marker position in the second direction based on the first brightness difference and determining the marker position in the first direction based on the second brightness difference.

A multicore optical fiber is made of silica-based glass. The multicore optical fiber includes a plurality of cores containing one or more kinds of elements among an alkali metal element group consisting of an alkali metal element and alkaline-earth metal element, and a cladding that surrounds the plurality of cores, and has a refractive index lower than a refractive index of the plurality of cores. All adjacent first cores and second cores among the plurality of cores have refractive indexes different from each other. A difference between a maximum value and a minimum value of a transmission loss of the plurality of cores at a wavelength of 1550 nm is 0.005 dB / km or less.

Method for laser material processing using a processing laser beam (3), wherein a first laser beam (8a), which is coupled into at least a first fiber core (9a) of an optical multicore fiber (9), and a second laser beam (8b), which is coupled into at least a second fiber core (9b) of the multicore fiber (9), are generated from a polarized input laser beam (5) using a birefringent crystal (7), wherein by influencing the polarization of the input laser beam (5) the ratio in which the power of the input laser beam (5) is divided between the first and the second laser beam (8a, 8b) is changed with a modulation frequency (f) between 1 Hz and 100 kHz, in particular between 100 Hz and 100 kHz, and thereby the first and the second laser beam (8a, 8b) can be coupled out of the multi-core fiber (9) alone or together as a processing laser beam (3). characterized by that the polarization is influenced by switching between linearly, circularly or elliptically polarized polarization by means of an electro-optic polarization modulator (6), in particular a Pockels cell or Faraday rotator, which can be controlled with the modulation frequency (f) to change the polarization of the input laser beam (5).

An optical fiber device includes a first optical fiber that is a coupled multicore fiber having a plurality of first cores and a first cladding, the plurality of first cores extending in a first fiber axis direction and being mode-coupled to each other, the first cladding surrounding the plurality of first cores, and a second optical fiber having one or more second cores and a second cladding, the one or more second cores extending in a second fiber axis direction, the second cladding surrounding the one or more second cores. The number of cores of the second optical fiber is smaller than the number of cores of the first optical fiber, and the second optical fiber and the first optical fiber are connected in a manner that the second cores are coaxial with any of the plurality of first cores.

The invention provides a multi-channel tunable filter and a preparation method thereof, and relates to the technical field of photonic devices. The multi-channel tunable filter comprises a section of input multi-core optical fiber, a section of output multi-core optical fiber and a section of microstructure optical fiber, the microstructure optical fiber is welded between the input multi-core optical fiber and the output multi-core optical fiber; at least two isolated micropore channels are arranged in the microstructure optical fiber in a penetrating mode in the axial direction of the microstructure optical fiber. The fiber core of the input multi-core optical fiber and the fiber core of the output multi-core optical fiber are correspondingly collimated with the micropore channel of the microstructure optical fiber respectively; wherein the at least two micropore channels are respectively filled with functional liquids with different optical characteristics; each micropore channel filled with the functional liquid and the collimated fiber cores at the two ends of the micropore channel jointly form a Fabry-Perot filtering cavity with the independent filtering characteristic. On the basis, the problem that a device capable of realizing multiple independent filtering channels in a single optical fiber is lacked in the prior art is solved.

The invention discloses a multi-core fiber grating array with a double-helix structure and a torsion measurement method. The array comprises 1 + N + M independent optical fibers which are engraved with gratings and wrapped by a coating layer to form a double-layer spiral structure. The inner layer is composed of a central straight optical fiber and N inner spiral optical fibers wound along a first steering wheel. The outer layer is composed of M outer spiral optical fibers wound in opposite directions. The invention provides two configurations of grating staggering and aligning. According to the invention, bending interference is accurately decoupled by using the same-layer phase difference, the limitation bottleneck of single-spiral measurement is broken through the complementary characteristic of double-layer reverse spiral, omni-directional large-range torsion measurement is realized, and meanwhile, the spatial sampling rate or the micro torsion measurement precision can be improved according to configuration.

The present invention relates to a system and method for monitoring multicore fibres (MCF). The system comprises a unit that generates the optical signal; a unit that processes and monitors this original signal; and the crosstalk and backscattering signals that are generated when the generated optical signal is transmitted through a fibre connecting two FIFOs. The method analyses these signals produced at different powers and determines a threshold defining a malfunction that switches off the laser in addition to transmitting radio signals over fibre without affecting data traffic quality, as assessed by the Error Vector Magnitude (EVM).

The object is to provide a photonics-electronics integrated module with improved information processing performance. [Solution] Provided is an optoelectronic fusion module comprising a common substrate, an integrated circuit chip section, and an optical engine section, wherein the integrated circuit chip section and the optical engine section are mounted on the common substrate, and an electrical wiring section is formed on the common substrate, and the electrical wiring section electrically connects the integrated circuit chip section and the optical engine section, the optical engine section has an optical receiving section and an optical transmitting section, and the optical engine section is optically connected to a multicore fiber, the optical receiving section generates a received electrical signal from a received optical signal, and the optical transmitting section generates a transmitted optical signal from a transmitted electrical signal, and the multicore fiber is configured with multiple cores surrounded by a cladding, and is optically connected to at least one of the optical receiving section and the optical transmitting section.

According to the present disclosure, the positional relationship of a plurality of cores can be determined with high accuracy. A fusion splicing device (1) according to one embodiment comprises: a pair of discharge electrodes (15); a rotating mechanism (20A, 20B) that rotates a multicore fiber; a light source (19) that irradiates the multicore fiber with light; a camera (18) that receives light emitted from an end surface of the multicore fiber and captures an image of the end surface; and a core detection unit (31) that detects a plurality of cores (C) of the multicore fiber from the image of the end surface captured by the camera (18). The core detection unit (31) detects the positions of the plurality of cores (C) in the end surface, and applies distinguishing information for distinguishing the plurality of cores (C) to each of the plurality of cores (C) in accordance with specified rules set in advance. The core detection unit (31) performs the detection of the positions of the plurality of cores (C) with respect to a pair of multicore fibers, and communicates information regarding fusion splicing of the pair of multicore fibers.

The present invention relates to a multicore optical fiber (10) configured for optical shape sensing. The optical fiber (10) comprises a cladding (12) and a plurality of fiber cores (14, 16, 18, 20) embedded in the cladding (12). The fiber cores (14, 16, 18, 20) each have a reflective strain sensitive structure (21) responsive to strain in the optical fiber (10). The cladding (12) comprises, along a length of the optical fiber (10), a main section (22) and a distal tip section (24) arranged distally from the main section (22). The main section (22) has a first width along a first axis transverse to a longitudinal axis of the optical fiber (10) and a first number of fiber cores, and the tip section (24) has a second width along a second axis parallel to said first axis and a second number of fiber cores. The second width is reduced with respect to the first width such that a bending stiffness of the tip section (24) about a bending axis orthogonal to said second axis is lower than the bending stiffness of the main section (22) about a bending axis orthogonal to said first axis. An elongated device for medical interventional application comprising such a multicore optical fiber is also disclosed.

This optical communication system 6A comprises: a plurality of modulators 63 that generate a respective plurality of optical control signals on the basis of a plurality of first microwave control signals; a multicore optical fiber 65 that transmits the plurality of optical control signals individually; and a light receiving substrate 67 that receives each of the plurality of optical control signals transmitted by the multicore optical fiber 65, converts the plurality of optical control signals into a plurality of second microwave control signals, and transmits the plurality of second microwave control signals to a quantum circuit 2.

This multi-core fiber amplifier comprises: a first optical fiber amplifier having a first excitation MCF that is cladding-pumped by excitation and backward excitation; an excitation light source that outputs an excitation light that excites the first excitation MCF; a second optical fiber amplifier having a second excitation MCF that is cladding-pumped by forward excitation and backward excitation using the excitation light output from the first excitation MCF; and a control circuit that performs control relating to the excitation light power of at least one of the first optical fiber amplifier and the second optical fiber amplifier.

This multicore fiber comprises 2-4 core elements (10), and satisfies Z≤453 when Z=(r1 2πΔ1)(r3 2-r2 2)π|Δ3| / r2, wherein r1 is the radius of a core (11), r2 is the radius of an intermediate layer (12), r3 is the radius of a trench layer (13), Δ1 is the relative refractive index of the core (11), Δ2 is the relative refractive index of the intermediate layer (12), and Δ3 is the relative refractive index of the trench layer (13).

This optical fiber winding device (10) comprises: a winding unit (40) that winds an optical fiber (11), which is a coupling-type multicore optical fiber, onto a winding member 41 that can rotate around a rotation center axis (41a); and a torsion imparting unit (50) that imparts torsion to the optical fiber (11) wound by the winding unit (40). The winding member (41) has a winding surface (42) onto which the optical fiber (11) is wound, and the winding surface (42) includes a curved surface (43). The curvature of the curved surface (43) with respect to the rotation center axis (41a) changes along at least one among the circumferential direction and the axial direction of the rotation center axis (41a).

The utility model discloses an optical fiber sensor and a sensing device. The optical fiber sensor comprises a first single-mode optical fiber, a coreless optical fiber, a multi-core optical fiber and a second single-mode optical fiber which are connected in sequence; the multi-core optical fiber comprises a central fiber core and at least one peripheral fiber core; the joint of the multi-core optical fiber and the second single-mode optical fiber comprises a spherical structure, and the spherical structure forms a Mach-Zehnder interferometer; a fundamental-mode light beam is input from a fiber core of the first single-mode optical fiber and excited by the coreless optical fiber to generate a high-order-mode light beam, the fundamental-mode light beam and the high-order-mode light beam are coupled into a cladding and a fiber core of the multi-core optical fiber, and the light beams of the two modes are diverged and focused in the spherical structure and then are coupled into a fiber core of the second single-mode optical fiber to be output. According to the optical fiber sensor provided by the utility model, a single-mode fiber-coreless fiber-multi-core fiber (fused ball)-single-mode fiber structure is adopted, a high-order mode in the fiber is fully excited through the coreless fiber and the spherical structure, the mechanical strength of the sensing structure is increased, and the optical loss of a device is reduced.

The application provides a kind of multicore optical fiber distributed sensing system and measurement method, and the multicore optical fiber distributed sensing system includes laser, circulator and optical fiber loop structure, laser is connected with the first port of circulator, and the second port of optical fiber loop structure is connected with circulator;It also includes optical wavelength division multiplexer, first optical detector and second optical detector, the multiplexing port of optical wavelength division multiplexer is connected with the third port of circulator, and the two distribution ports of optical wavelength division multiplexer are connected with first optical detector and second optical detector respectively, and optical wavelength division multiplexer is used to separate Stokes light signal and anti-Stokes light signal in Raman scattering light, first optical detector is used to convert Stokes light signal into Stokes electrical signal, and second optical detector is used to convert anti-Stokes light signal into anti-Stokes electrical signal.The embodiment of the application realizes the fusion of two independent optical fiber sensing systems, and realizes the simultaneous measurement of temperature and bending two parameters.