36results about "Multicore optical fibre" patented technology

A catheter placement system for placing a catheter, the system includes a stylet with an optical fiber extending therethrough, the stylet body extending between a proximal end and a distal tip. A console, equipped with optical logic, delivers broadband incidence light to the optical fiber and receives reflected light signals to determine positional information about the stylet body. The stylet body is configured to be separable at a point between the proximal end and distal tip to allow a catheter to be advanced over a distal portion of the stylet body. The distal portion is configured to be reattached to the proximal portion to reconfirm the position of the stylet body distal tip prior to removal of the stylet from the catheter. The system further includes a severing device that is easy to actuate and ensures a clean, perpendicular cut to facilitate reconnection between the proximal and distal portions.

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.

A catheter placement system for placing a catheter, the system including a stylet with an optical fiber (135) extending therethrough, a stylet body (290) extending between a proximal end and a distal tip (290). A console (20), equipped with optical logic, delivers broadband incidence light to the optical fiber and receives reflected light signals to determine positional information about the stylet body. The stylet body is configured to be separable at a point between the proximal end and distal tip to allow a catheter to be advanced over a distal portion of the stylet body. The distal portion is configured to be reattached to the proximal portion to reconfirm the position of the stylet body distal tip prior to removal of the stylet from the catheter. The system further includes a severing device that is easy to actuate and ensures a clean, perpendicular cut to facilitate reconnection between the proximal and distal portions.

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 fusion splicing machine according to one embodiment includes: an optical fiber holder holding an optical fiber in the state where a tip end of the optical fiber protrudes; a rotation mechanism arranged on the opposite side of the optical fiber holder to the tip end of the optical fiber and rotating the optical fiber holder around the axis extending along the optical fiber; and a clamp unit pressing the tip end portion of the optical fiber held by the optical fiber holder. The rotation mechanism rotates the clamp unit together with the optical fiber holder.

A multicore optical fiber (1) comprises a silica-based glass. The multicore optical fiber (1) comprises: a plurality of cores (2) that include one or more elements from an alkali metal element group which includes alkali metal elements and alkaline earth metal elements; and a cladding (3) that surrounds the cores and that has a refractive index which is lower than that of the cores. In a cross-section orthogonal to the fiber axis, the difference between the maximum value of residual stress on a line segment (L) connecting the centers of adjacent cores among the plurality of cores and the average value of the residual stress of the plurality of cores (2) is not more than 30 MPa.

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.

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.

The application provides a magnetic control flexible CO2 laser few-mode multi-core energy transmission optical fiber and a preparation method thereof. The magnetic control flexible CO2 laser few-mode multi-core energy transmission optical fiber has at least two independent laser transmission structures, a polymer cladding layer wrapped around the outer periphery of the laser transmission structure, and a magnetic outer cladding layer wrapped around the outer periphery of the polymer cladding layer, a single laser transmission channel outputs less than two modes of CO2 laser, and the adjustable controllability of the optical fiber output light field is realized, while the flexibility, robustness and actuation of the optical fiber are ensured. By controlling the fiber core diameter or the refractive index difference of the core cladding material, the single optical channel laser single-mode or few-mode output can be controlled, by controlling the number, position, distance and adding the inter-channel polymer of the optical fiber laser transmission channel, the optical crosstalk between channels can be reduced, the output light field of the optical fiber can be precisely adjusted, by controlling the magnetic particle doping amount, diameter and external magnetic field of the magnetic outer cladding layer, the movement and turning of the optical fiber can be controlled, and high-precision minimally invasive surgical medical operation is realized.

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

Provided is a multicore fiber connecting device that includes a fiber position adjusting unit for adjusting spatial positions of a first multicore fiber and a second multicore fiber connected to the first multicore fiber, a first optical connecting unit for introducing testing light of a different wavelength for each core, to each of the cores of the first multicore fiber, an optical spectrum information generating unit for generating optical spectrum information of the testing light after the testing light has been guided through the first multicore fiber and the second multicore fiber, and a control unit for controlling the fiber position adjusting unit by use of the optical spectrum information.

The present application is an MCF capable of O-band transmission for a short distance and having a standard cladding diameter with an MFD equivalent to a general SMF, and a 12-core MCF optical fiber capable of inter-fiber connection even without both of marking and polarity and capable of counter-propagation transmission. The MCF of the present application has 12 cores and a common cladding, the common cladding has a circular outer periphery in a cross section, the 12 cores are arranged such that cores in an adjacent relationship with respect to any core do not have an adjacent relationship with each other, and are respectively arranged such that an axis crossing a center axis and not passing through the center of any of the 12 cores is taken as a symmetry axis, the centers of the 12 cores are linearly symmetrical, and the arrangement of the centers of the 12 cores has a rotational symmetry of 1 order.

Provided is an optical combiner that can easily perform fusion processing of an input-side optical member and an output-side optical member. An optical combiner (40) includes an optical output portion (130) having a connection end surface (135) to which an optical input portion (110, 120) having a core (11, 21) is connected. The optical output portion (130) includes: a core (31, 33) that propagates light; and an outer cladding layer (34) that is located outside the core (33). The optical input portion (110, 120) is connected to the connection end surface (135) of the optical output portion (130) in such a manner that the core (11, 21) is optically coupled to the core (31, 33) of the optical output portion (130). An outer diameter (D1) of the outer cladding layer (34) on the connection end surface (135) of the optical output portion (130) is smaller than a diameter of a minimum containing circle (C1) of a cladding layer (22) of the optical input portion (120) that contains all of the optical input portion (120) on the connection end surface (135) of the optical output portion (130).

Known methods for producing a multicore fiber include providing an elongated base body containing a glass sheath material and having at least two through-holes, inserting a core rod into the through-holes to form a component assembly, drawing the component assembly to form the multicore fiber or further processing it into a preform from which the multicore fiber is drawn, wherein the component assembly is held from above by means of a holder made of glass which is connected to the base body by forming a welding contact surface.In order to specify a method in which the loading of the base body with core bars is not limited by the layout of the holder, and which in particular allows loading with all core bars from above even after the holder has been welded on, it is proposed that a holder with an elongated hollow part be used, which has a hollow channel with an inner contour that is larger than a hole area circumference within which the through holes lie completely or with at least 90% of their hole diameter, and which has a radial outer dimension that is larger than the outer diameter of the base body.

A rod insertion jig inserts a glass rod into a hole penetrating a cladding preform. The rod insertion jig includes a support portion installed in contact with an inner surface of a first glass pipe, a first holding portion supported by the support portion inside the first glass pipe, and a first moving portion that is a member for moving a first glass rod. The first holding portion has a first mounting surface on which the first glass rod is mounted along a first direction. The support portion supports the first holding portion such that the first glass rod mounted on the first mounting surface entirely overlaps a first hole as viewed from the first direction. The first moving portion moves the first glass rod mounted on the first mounting surface in the first direction.

One embodiment of the present disclosure relates to an optical fiber alignment method that enables highly accurate alignment of an optical fiber without applying a complicated driving system. The alignment method includes finely aligning the first and second optical fibers and finely aligning. Roughly aligning the first and second optical fibers based on a result of end-surface observation. Finely aligning the first and second optical fibers based on a result of side-surface observation in such a manner as to increase an optical coupling efficiency between each pair of the cores in the first and second optical fibers.

The multi-core optical fiber includes a plurality of cores, a first cladding, and a second cladding. The second cladding has a refractive index lower than a refractive index of each of the cores and higher than a refractive index of the first cladding. The multi-core optical fiber has a transmission loss of 0.22 dB / km or less. When an effective area of each of the cores is denoted as Aeff, a center-to-center distance between two cores is denoted as Λ, and a relative refractive index difference of each of the cores with respect to the refractive index of the first cladding is denoted as Δcore, Aeff1 is defined byAeff⁢1=18.6-4.63 ln⁢ (Δcore)+1.24Λ+2⁢4.1[ln⁢ (Δcore)]⁢2-6.05×10-3⁢Λ2-0.858Λ⁢ ln⁢ (Δcore),andthe multi-core optical fiber satisfies Condition below by using Aeff1.0.35≤Δcore≤1.25≤Λ≤5⁢00.8Aeff⁢1≤Aeff≤1.35Aeff⁢1

The present disclosure provides an optical fiber (10) comprising one or more glass cores (12, 121, 122, 123, 124) extending along a length of the optical fiber (10) and a glass cladding (14) with a peripheral region (16), one or more interface regions (18, 181, 182, 183, 184) and one or more intermediate regions (20, 201, 202, 203, 204). The optical fiber (10) comprises an alumina (Al2O3) doping in the entire glass cladding (14) or at least one of the peripheral region (16), the one or more interface regions (18, 181, 182, 183, 184) and the one or more intermediate regions (20, 201, 202, 203, 204), provided that, when the optical fiber (10) comprises a single glass core (12), the alumina doping in the intermediate regions (20, 201, 202, 203, 204) is distributed among multiple intermediate regions (20, 201, 202, 203, 204) or included in combination with alumina doping in at least one of the peripheral region (16) and the one or more interface regions (18, 181, 182, 183, 184).

An optical fiber cable includes a plurality of optical fibers, and a sheath covering the plurality of optical fibers from an outside. Each of the plurality of optical fibers is a multi-core fiber including a plurality of cores. A glass diameter of each of the plurality of optical fibers is larger than 125 μm. A core density is 11 core / mm2 or more.

This invention discloses a graded-index non-zero dispersion-shifted optical fiber based on orbital angular momentum modes, comprising an optical fiber body including a ring core and an optical fiber cladding surrounding the ring core. The optical fiber cladding includes a circular region inside the ring core and an outer optical fiber cladding outside the ring core. This invention aims to provide a feasible optical fiber structure for suppressing four-wave mixing to meet the requirements of low-dispersion transmission of multiple orbital angular momentum modes.

A multi-core optical fiber includes: a pair of cores; and a cladding that covers both of the pair of cores. A diameter of the cladding is 124 μm or more and 126 μm or less. A distance between centers of the pair of cores is 46.5 μm or less. Cross talk between counter-propagating cores at a wavelength of 1550 nm is −30 dB / 100 km or less.

The present invention relates to an optical fiber with improved bend performance and manufacturing method thereof. The optical fiber (100) comprises a core region (108) defined by a core refractive index profile (200) and a cladding region (106) surrounding the core region defined by a cladding refractive index profile (400). Particularly, the core region has a first core (102) defined by a first core refractive index (RI) profile (202) and a first core RI max (Δpeak) and a second core (104) defined by a second core RI profile (204) and a second core RI max (Δcore). Moreover, the cladding region further comprises a first cladding (106) and a third cladding (110) composed of pure silica and a second cladding (108) composed of a down-doped silica, where the down-dopant is fluorine.

Optical fibers of a multi-fiber cable are grouped into connection units. The distal ends of the fibers of each connection unit are terminated at a connection unit body that attaches to a tapering cable core formed of longer ones of the connection units. After deployment of the cable, two or more connection units can be stacked together to form a connector or inserted into a connector shell. Prior to deployment of the cable, at least some of the connection units are spaced from each other along the cable. For example, individual connection units may be disposed at one end of the tapering cable core and stacks of connection units may be disposed at the other end of the tapering cable core.

A power splitter may include a single-core optical fiber, a beam-splitting optical fiber, and a multicore optical fiber. The beam-splitting optical fiber may include a polygonal core configured to output a multimode interference beam pattern including a plurality of beam spots, an input end coupled to the single-core optical fiber, and an output end coupled to the multicore optical fiber. In embodiments, a difference between a mode field diameter of the cores of the multicore optical fiber and a mode field diameter of the core of the single-core optical fiber may be less than or equal to 50%. In embodiments, when the power splitter is in operation, a difference between a distance between neighboring beam spots of the multimode interference beam pattern output by the beam-splitting optical fiber and a core pitch of the cores of the multicore optical fiber may be less than or equal to 10%.

A photonic lantern includes three or more optical fibers housed within a glass capillary, each optical fiber includes a core and a cladding. The photonic lantern tapers between a first and second end such that a diameter of the glass capillary is greater at the first end than the second end and the cladding of at least two of the three or more optical fibers comprises an up-down doped cladding doped with a dopant combination that includes an up-dopant and a down-dopant. The up-dopant increases and the down-dopant decreases the effective refractive index of the up-down doped cladding. The dopant combination decreases a material viscosity of the up-down doped cladding such that a difference in the effective refractive index between a silica cladding and the up-down doped cladding is greater in a tapered region and at the second end than at the first end.

This provides a multi-core optical fiber with improved microbending and reduced diameter. [Solution] The multi-core optical fiber consists of a first core made of alkali metal-doped silica glass, a first inner cladding surrounding the first core, and a 30%Δ-micrometer core surrounding the first inner cladding. 2 A first outer cladding comprising a first trench region having the above trench volume, a second core made of alkali metal-doped silica glass, a second inner cladding surrounding the second core, and surrounding the second inner cladding, 30%Δ·micrometer 2 The structure comprises a second outer cladding including a second trench region having the above trench volume, and a common cladding surrounding the first core and the second core, respectively. Each of the first core and the second core has a waveguide light signal of 1550 nm with a wavelength of 100 micrometers 2 It has the following effective area.

A multicore optical fiber (10) configured for optical shape sensing. The fiber (10) includes a cladding (12) and a plurality of cores (14, 16, 18, 20) embedded in the cladding (12). The cores (14, 16, 18, 20) each have a reflective strain-sensitive structure (21) responsive to strain in the fiber (10). The cladding (12) includes a main section (22) along a length of the fiber (10) and a distal tip section (24) disposed distal of the main section (22). The main section (22) has a first width along a first axis transverse to a longitudinal axis of the fiber (10) and a first number of cores, and the tip section (24) has a second width along a second axis parallel to the first axis and a second number of cores. The second width is reduced relative to the first width such that a bending stiffness of the tip section (24) about a bending axis orthogonal to the second axis is lower than a bending stiffness of the main section (22) about a bending axis orthogonal to the first axis. Also disclosed is an elongate device for medical intervention applications including such a multicore optical fiber.

Provided is a method of suppressing an output light intensity difference caused by inter-core crosstalk in order to reduce signal processing of a coupled MCF as much as possible. A communication system includes a coupled multi-core fiber, input-side single-mode fibers and output-side single-mode fibers corresponding to the number of cores of the coupled multi-core fiber, a fan-in element that connects the input-side single-mode fibers and the coupled multi-core fiber, a fan-out element that connects the coupled multi-core fiber and the output-side single-mode fibers, and an optical element, and the optical element is an element that is disposed between the input-side single-mode fibers and the fan-in element or between the fan-in element and the coupled multi-core fiber, and changes any one of polarization or phase of incident light, or both.

According to the present disclosure, there is provided an endoscopic fibre having a proximal end and a distal end, comprising a plurality of cores wherein one or more of the cores comprise excitation core(s) and one or more of the cores comprise collection core(s); wherein the excitation core or cores each comprises a solid core; wherein the collection core or cores each comprises a respective solid core with a refractive index that is different to a refractive index of the excitation core or cores; wherein the excitation core or cores are configured to transmit an optical excitation signal from the proximal end to a target region at or near the distal end; and wherein the collection core or cores are configured to transmit an optical detection signal from the target region at or near the distal end to the proximal end; and the difference in refractive index between excitation core(s) and the collection core(s) is such that cross-talk between mode(s) in the excitation core(s) and mode(s) in the collection core(s) is reduced or eliminated. There is also provided a fibre connector configured to connect to the fibre, a detection system comprising a laser source or other excitation light source connected to the excitation core(s) of the fibre, and a method of performing Raman spectroscopy comprising transmitting an excitation signal to a target region via the excitation core(s) of a fibre.

The present disclosure provides a method for performing curing during manufacturing of an optical fibre ribbon. The method performs a first stage of curing and a second stage of curing on a matrix material of the optical fibre ribbon. The first stage of curing is performed using a ribbon die (102) and one or more ultraviolet light emitting diode (UV LED) units (104). Further, the second stage of curing is performed using a source (202) of the one or more ultraviolet lamps (UV lamps) in an UV chamber (204).