142 results about "Multicore fiber" patented technology

A multicore fiber cable fanout device configured to connect a multicore fiber (MCF) cable comprising M MCFs having N cores with M×N single core fiber (SCP) pigtails is provided. The fanout device can include a housing enclosure and M MCF-to-SCF fanouts within the housing enclosure. The M×N SCF pigtails can be grouped in M×N / K SCF groups containing K SCF pigtails.

A method of manufacturing an optical fiber, the method including mounting a glass sleeve in a selective etching apparatus. The sleeve comprising one or more axial through-holes, and the etching apparatus comprising a first end cap with a central aperture disposed therethrough, the first end cap being attached to a first surface of the sleeve. The method further including exposing the sleeve to an acid solution such that a first portion of the first surface is exposed to the acid solution and a second portion of the first surface is not exposed to the acid solution. The first portion being adjacent to the central aperture when the sleeve is mounted in the selective etching apparatus, and the second portion being covered by the first end cap when the sleeve is mounted in the selective etching apparatus.

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.

This multicore fiber (100) comprises: a plurality of center core parts (111, 112); a plurality of low refractive index layers (131, 132) that surround the outer circumference of each of the center core parts; and a cladding part (140) that surrounds the plurality of low refractive index layers. The maximum refractive index of the center core parts is higher than the average refractive index of the cladding part. The minimum refractive index of the low refractive index layers is lower than the average refractive index of the cladding part. Among the plurality of center core parts, the absolute value of the difference in the relative refractive index difference of the maximum refractive index of the center core parts with respect to the average refractive index of the cladding part, and the absolute value of the difference in the center core diameters are 10% or less. In two low refractive index layers among the plurality of low refractive index layers, the absolute value of the difference in the relative refractive index of the minimum refractive index of the low refractive index layers with respect to the average refractive index of the cladding part, or the absolute value of the difference in the ratio of the outer diameters of the low refractive index layers with respect to the center core diameters is 10% or more.

A three-dimensional optical device (100) for coupling light from a single-core input fiber into a plurality of separate fiber cores of a multicore output fiber is disclosed. The optical device is formed in a photopolymer material and comprises an input waveguide (110), a plurality of output waveguides (130a-d), and a non-planar multimode interference section (120) for splitting light of a first mode (210) at a first end face (221) of the MMI section into a plurality of second modes (230a-d) at a second end face (222) of the MMI section. The plurality of second modes comprises a central mode (230a) and a plurality of peripheral modes (230b-d). Each output waveguide has a proximal end (131) separately connected to the second end face of the MMI section. A mode field diameter associated with the input waveguide and output waveguides is smaller at the proximal end than at the distal end. A distance between adjacent output waveguides is smaller at the proximal ends.

A ribbon can be formed from multicore fibers containing multiple cores. The ribbon can be marked at predetermined lengths. The ribbon can be cut at the predetermined lengths to form a plurality of ribbon pieces. The ends of the ribbon pieces can be spliced together based on the marks.

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.

A heterogeneous multicore optical fiber includes two or more core elements and features low counterpropagating crosstalk at large bend radius. At least a pair of the two or more core elements differ in propagation constant β and preferably have similar effective area Aeff at 1550 nm. The heterogeneous multicore optical fiber exhibits a critical bend radius corresponding to a maximum in counterpropagating crosstalk and marking a regime of higher bend radius over which counterpropagating crosstalk decreases. The critical bend radius is preferably less than 2000 mm.

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 method is presented for fabricating a multi-core fiber of a complex geometry. A plurality of N initial optical packages is provided, each optical package having an initial cross-sectional dimension a and including a predetermined number M of optical guiding units. This N optical packages are bundled into a bundle structure, and this bundle structure undergoes heating-based treatment to compress it and obtain a new multicore fiber having a cross-sectional dimension c being equal or smaller than the initial cross-sectional dimension a and including a number N×M cores.

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.

In some implementations, an optical system comprises a multicore fiber having multiple cores arranged along one or more isotherms and an isotropic cooling environment housing the multicore fiber. In some implementations, the isotropic cooling environment includes a cold plate having a groove shaped to fit the multicore fiber and a structure to enclose the multicore fiber within the groove.

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.

An optical transmitter includes an array of light sources to transmit visible light having a wavelength of from 580 nm to 700 nm along a respective core of a multicore fibre optic cable for receipt at a corresponding photodetector array of an optical receiver unit, and a controller that receives data from a transmitting computer system and encodes and transmits it by modulating the visible light output by the array of light sources. An optical receiver unit includes a photodetector array to receive the modulated visible light from the multicore fibre optic cable; and a controller to receive the output of the photodetectors; decode data from the received output, and provide the decoded data to a receiving computer system. An optical transceiver unit includes the optical transmitter and optical receiver.

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.