113 results about "Multicore fiber" patented technology

An optical fiber includes multiple optical cores configured in the fiber including a set of primary cores and an auxiliary core. An interferometric measurement system uses measurements from the multiple primary cores to predict a response from the auxiliary core. The predicted auxiliary core response is compared with the actual auxiliary core response to determine if they differ by more than a predetermined amount, in which case the measurements from the multiple primary cores may be deemed unreliable.

A system of aligning concatenated sections of multicore optical fiber incorporates the capability of intentionally changing core assignments as part of the azimuthal alignment process. The intentional changing of core assignments, referred to as offset clocking, compensates for differences in properties of the individual core regions in a way that reduces variations between the spatial channels supported in the transmission system. The offset clocking technique can be used, e.g., to improve the attenuation (or other selected properties of the propagating signals). The offset clocking technique may be used to step through sequential changes core assignments at one or more splice locations (passive clocking) or identify a particular pairing of cores from one fiber section to the next (e.g., “good quality” core assigned to a “poor quality” signal exiting the first section) and rotate the fiber sections with respect to each other to achieve this particular core assignment.

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 wavelength division multiplexer for space division multiplexing may comprise a wavelength division multiplexing fan-out device or a pump signal combiner for multicore fibers.

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 multicore fiber connection method comprises: a determination step (S3) for determining the rotational position for multicore fibers (2), where the distance dispersion between a line (L) connecting respective tips of a pair of high-voltage discharge electrodes (61a), (61b) located across a butting position of the multicore fibers (2) and the central axes (CC) of the respective cores (21) becomes a prescribed value equal to or lower than the value intermediate between the minimum value and the maximum value in a dispersion distribution when the multicore fibers (2) are rotated around the central axis (C) of a cladding (22); an installation step (S4) for installing the respective multicore fibers (2) at the determined rotational position; and a fusion step (S5) for performing discharge from the pair of high-voltage discharge electrodes (61a), (61b) and for fusing the respective multicore fibers (2) to each other.

A multicore fiber includes multiple first linear portions that include a first core portion and a first cladding portion having a refractive index lower than a maximum refractive index of the first core portion and surrounding an outer periphery of the first core portion, and a first tubular portion. The first linear portions are respectively joined to an inner wall of the first tubular portion, and two of the first linear portions are not in contact with each other on a first virtual line connecting centers of the two of the first core portions included in two of the first linear portions on a cross-section perpendicular to the longitudinal direction, at least in a portion in a longitudinal direction.

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.

To provide a spatial multiplexing optical transmission system using a multicore fiber, which does not use a tone signal and does not require any compensation circuit for phase fluctuations in a receiving circuit.SOLUTION: One of multiple cores is used as an optical length control channel for compensating for optical length fluctuations that occur in a multicore fiber. Coherent optical communication or quantum communication / quantum key delivery is performed using another core in the multicore fiber whose optical length has been controlled by the optical length control channel.SELECTED DRAWING: Figure 1

An optical fiber cable (10) is provided with one or a plurality of optical fiber bundles (11) including a plurality of optical fibers (12) that are coupled multicore optical fibers. At least one of the plurality of optical fibers (12) and the optical fiber bundle (11) is twisted to form a helix, and at least one of the radius and the pitch of the helix changes along the axial direction of the helix.

It is an object of the present invention to provide a multicore optical fiber, a design method for the multicore optical fiber and an optical transmission method using the multicore optical fiber including four cores having a standard cladding diameter of 125±1 μm for an existing single mode optical fiber covering several thousands of kilometers of transmission. The multicore optical fiber according to the present invention disposes two-stage claddings with different refractive indices around each core, and designates as a predetermined range, a core radius a1, a radius a2 of a first cladding region surrounding each core, specific refractive index Δ1 relative to the core of the first cladding region and a specific refractive index Δ2 relative to the core of a second cladding region including four cores and the first cladding region.

It is an object of the present invention to provide a multicore optical fiber, a design method for the multicore optical fiber and an optical transmission method using the multicore optical fiber including four cores having a standard cladding diameter of 125±1 μm for an existing single mode optical fiber covering several thousands of kilometers of transmission. The multicore optical fiber according to the present invention disposes two-stage claddings with different refractive indices around each core, and designates as a predetermined range, a core radius a1, a radius a2 of a first cladding region surrounding each core, specific refractive index Δ1 relative to the core of the first cladding region and a specific refractive index Δ2 relative to the core of a second cladding region including four cores and the first cladding region.

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.

A multicore fiber includes: a plurality of first glass regions each including: a core portion; and a first cladding portion having a lower refractive index than a maximum refractive index of the core portion; and a cladding region formed on outer peripheries of the plurality of first glass regions, wherein compressive stress is applied to the plurality of first glass regions.

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.

A preform for multicore optical fiber is described. The preform includes an assembly of core canes arranged in a desired configuration. The core canes are placed in mutual contact with each other to define a series of contact zones between contacting pairs of core canes. The core canes are fused at selected locations within the contact zones to secure the core canes to form a preform from which a multicore optical fiber can be formed. The preform maintains good alignment of core canes and minimizes deformation of core canes during the fiber draw process. Multicore fibers having excellent uniformity in core diameter are produced from the preforms in conventional fiber draw processes.

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.

A method comprising: cutting a plastic multicore fiber into two or more sub fibers; connecting each of the two or more sub fibers to respective additional fibers. Further, a method comprising: cutting a first plastic multicore fiber to remove part of the first plastic multicore fiber and provide a first sub fiber, the first sub fiber comprising a residual part of the first plastic multicore fiber; cutting a second plastic multicore fiber to remove part of the second plastic multicore fiber and provide a second sub fiber, the second sub fiber comprising a residual part of the second plastic multicore fiber; connecting an optical fiber to the first sub fiber and the second sub fiber using a connector.

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.