689 results about "Multi core fiber" patented technology

In a polarization maintaining multi-core optical fiber according to the present invention, structural birefringence is generated since an elliptic core is applied. In addition, each core is arranged so that a direction of a line connecting between centers of the nearest cores and a long axis direction of a field distribution in each core may be different from each other, and thereby, overlap of field distributions between the nearest cores is reduced. As a result, a crosstalk among cores is reduced.

A multi-core fiber includes an even number of six or more of cores and a clad that surrounds the outer circumferential surfaces of the cores. The cores are formed of two types of cores and in which an effective refractive index difference in a fundamental mode is 0.002 or less in a predetermined range or more that the effective refractive index difference in the fundamental mode is varied according to a core pitch. Two types of the cores are alternately and annularly disposed at regular spacings. A difference in the mode field diameter of light propagating through the cores is 1 μm or less.

A multi-core optical fiber apparatus is disclosed. The multi-core optical fiber apparatus includes a cladding comprising quartz and a plurality of cores embedded in the cladding. Each of the cores has a diameter (D) ranging from 1.3 μm to 2.0 μm, a numerical aperture (NA) from 0.35 to 0.45 and a refractive index profile factor (α) from 2.0 to 4.0. A center of each of the cores has a germanium content of 20 wt % to 30 wt %. An interval between adjacent cores is 3.0 μm or more.

The apparatus includes a fiber comprising an axial center, a central single-mode waveguiding core and a plurality of peripheral single-mode waveguiding cores. The central core is located at a first distance from the axial center. The plurality of peripheral cores is located at respective second distances from the axial center. Each of the respective second distances is greater than the first distance, and each peripheral core of the plurality of peripheral cores follows a respective first helix about the axial center. The central core and the plurality of peripheral cores include an optical strain sensor rosette.

Multi-core optical fiber probe includes a multi-core optical fiber (and method of manufacturing the probe) including a plurality of cores adjacent a cladding material, and a plurality of angled reflectors disposed at a distal end of the cores. An angled reflector of the plurality of angled reflectors deflects light propagating in the core at a deflection angle that is different from an axis of light propagation in the core. Light propagating toward a distal end of the core of the multi-core probe is emitted, after reflection by the corresponding reflector, out of the multi-core optical fiber probe.

An interferometric measurement system includes a spun optical fiber including multiple optical waveguides configured in the fiber. Interferometric detection circuitry detects measurement interferometric pattern data associated with each of the multiple optical waveguides when the optical fiber is placed into a bend. Data processing circuitry determines compensation parameters that compensate for variations between an optimal configuration of the multiple optical waveguides in the fiber and an actual configuration of multiple optical waveguides in the fiber. The compensation parameters are stored in memory for compensating subsequently-obtained measurement interferometric pattern data for the fiber. The compensation parameters are applied to the subsequently-obtained measurement interferometric pattern data in order to distinguish between axial strain, bend strain, and twist strain on the fiber and to accurately determine one or more strain values for the fiber corresponding to one or more of the axial strain, bend strain, or twist strain on the fiber.

Optical fiber interconnection devices, which can take the form of a module, are disclosed that include an array of optical fibers and multi-fiber optical-fiber connectors, for example, two twelve-port connectors or multiples thereof, and three eight-port connectors or multiples thereof. The array of optical fibers is color-coded and is configured to optically interconnect the ports of the two twelve-port connectors to the three eight-port connectors in a manner that preserves transmit and receive polarization. In one embodiment, the interconnection devices provide optical interconnections between twelve-fiber optical connector configurations to eight-fiber optical connector configurations, such as from twelve-fiber line cards to eight-fiber line cards, without having to make structural changes to cabling infrastructure. In one aspect, the optical fiber interconnection devices provide a migration path from duplex optics to parallel optics.

The present invention relates to a multi-core optical fiber having a structure to effectively reduce crosstalk between adjacent core regions among a plurality of core regions. The multi-core optical fiber (1) has a leakage reduction portion (50), at least a portion of which is arranged at a position on a straight line connecting adjacent core regions together among a plurality of core regions (10). The leakage reduction portion (50) reduces leakage light in the multi-core optical fiber (1) from each of the core regions (10), thereby effectively reducing crosstalk between adjacent core regions.

The specification describes a technique for drawing circular core multimode optical fiber using twist during draw to increase fiber bandwidth.

An optical transmission system includes an optical transmitting unit that outputs at least one optical signal having a wavelength included in an operation wavelength band and a holey fiber that is connected to the optical transmitting unit. The holey fiber includes a core and a cladding formed around the core. The cladding includes a plurality of holes formed around the core in a triangular lattice shape. The holey fiber transmits the optical signal in a single mode. A bending loss of the holey fiber is equal to or less than 5 dB / m at a wavelength within the operation wavelength band when the holey fiber is wound at a diameter of 20 millimeters.

A space division multiplexed (SDM) transmission system that includes at least two segments of transmission media in which a spatial assignment of the two segments is different is provided. For example, the SDM transmission may include a first segment of transmission media having a first spatial assignment and a second segment of transmission media having a second spatial assignment, wherein the first spatial assignment differs from the second spatial assignment. An example method obtains an optical signal on a first segment of transmission media having a first spatial assignment and forwards the optical signal on a second segment of transmission media with a different spatial assignment. The transmission media may be a multi-core fiber (MCF), a multi-mode fiber (MMF), a few-mode fiber (FMF), or a ribbon cable comprising nominally uncoupled single-mode fiber (SMF).

The present invention relates to a multi-core optical fiber having a structure for reducing transmission loss and nonlinearity. The multi-core optical fiber comprises plural cores extending along a center axis direction, and a cladding surrounding the peripheries of the plural cores. The cladding is comprised of silica glass doped with fluorine, and each of the plural cores is comprised of silica glass doped with chlorine or pure silica glass.

The invention belongs to the fiber sensing technical field, and specifically relates to a multi-core fiber bragg grating (FBG) universal bending sensor; the multi-core fiber bragg grating (FBG) universal bending sensor is suitable for smart material and structure on-line detection and analysis, can control and monitor space structure space three dimensional positions and attitudes, and is formed by using the multi-core fiber bragg grating (FBG) as the basic sensing unit; the multi-core fiber bragg grating (FBG) universal bending sensor comprises multi-core fibers including one center fiber core, and the resting fiber cores are arranged around the center fiber core in quadrature distribution or symmetrical distribution; each fiber core in the same transverse position of the multi-core fiber uses the same phase mask slice to simultaneously expose the FBG; the central wavelengths of various Bragg gratings on the multi-core fiber are different; the multi-core fiber bragg grating (FBG) universal bending sensor can monitor various reflection wavelength changes of the multi-core FBG, thus measuring the bending amplitude and direction angles.

An optical coupling system includes a first unit including a source of light or a first multi-core optical fiber, each of the source and the first multi-core optical fiber including at least a first aperture, a second unit including a second multi-core optical fiber including at least a second aperture corresponding to the first aperture of the first unit, and a lens array unit redirecting light between the first unit and the second unit, the lens array unit substantially matching light rays transmitted or received between the first aperture of the first unit and the corresponding second aperture of the second unit.

The present invention relates to a multi-core fiber having a structure for effectively suppressing crosstalk increase between cores caused by bending within an allowable range. The multi-core fiber comprises a plurality of types of cores respectively extending along an optical axis and a cladding region, and the effective refractive index of each core is set so that, in all pairs of cores of different types, a relative refractive index difference between an effective refractive index of a core of a certain type and an effective refractive index of a core of another type satisfies a condition regulated according to a core spacing between cores and a bending radius.

The invention discloses a single-core and multi-core fiber coupler and fiber access into rafah cone coupling method. It peels the ending coating layer of a single-core optical fibers and a multi-core fiber, direct financial with the fiber welding machine in stripping department, received and in the implementation of solder joint heating department fused biconical taper, monitoring optical power, when cone waist rafah small cone of light power distribution to the target, spectrophotometer stopping widening cone. The method is the technical characteristics of single-core fiber and multi-core fiber fusion welding, the solder joint implemented fused biconical taper, thus forming a cone of light energy distribution, optical power of distribution. The method can be single-core optical fiber distribution of power coupled multi-core optical fiber to each core, or multi-core fiber coupling of light waves to single-core fiber, to achieve optical spectrophotometer and cooperation functions.

An example transmitter includes an encoder, a plurality of modulators and a spatial multiplexer. The encoder is configured to encode one or more input bit streams into a plurality of coded bit streams which are provided as output. Each modulator is configured to receive and modulate a respective one of the plurality of coded bit streams and to provide a modulated output signal. The spatial multiplexer is configured to spatially multiplex the plurality of modulated output signals for insertion on a spatially multiplexing waveguide. A modulated output signal(s) may be inserted onto a mode of a multi-mode fiber or onto a core of a multi-core fiber. In one embodiment, a subset of the plurality of spatially multiplexed modulated output signals which correspond to the one or more input bit streams must be simultaneously and spatially selectively detected in order to recover a first input bit stream.

An optical fibre bend sensor (10) measures the degree and orientation of bending present in a sensor length (30) portion of a fibre assembly (26). Within a multicored fibre (30, 32,34), cores (62, 66) are grouped in non-coplanar pairs. An arrangement of optical elements (28, 36, 38) define within each core pair (62, 66) two optical paths (122, 124) which differ along the sensor length (30): one core (62) of a pair (62, 66) is included in the first path (122), and the other core (66) in the second path (124). A general bending of the sensor region (30) will lengthen one core (62, 66) with respect to the other. Interrogation of this length differential by means of interferometry generates interferograms from which the degree of bending in the plane of the core pair is extracted. Bend orientation can be deduced from data extracted from multiple core pairs.

A medical device, system, and method having a flexible shaft and a multi-core fiber within the flexible shaft. The multi-core fiber includes a plurality of optical cores dedicated for shape sensing sensors, and a plurality of optical cores dedicated for force sensing sensors. A medical device flexing structure assembly can comprise a multi-core fiber comprising a plurality of cores, and a flexing structure comprising at least one slot. Each of the plurality of cores can comprise a fiber Bragg grating, and the flexing structure can be configured to bend in response to a force imparted on the flexing structure.

A multi-core optical fibre and a sensor based on the multi-core optical fibre and a running method therefor. The multi-core optical fibre comprises a transmission fibre core (15) and a plurality of sensing fibre cores (16), the length of the sensing fibre core (16) being not less than the length of the transmission fibre core (15). The sensor based on the multi-core optical fibre comprises a light source module (12), the multi-core optical fibre and optical detector modules (5, 7, 8). The light source module (12) injects optical signals in the transmission fibre core (15). The optical detector modules (5, 7, 8) detect the variation of optical signals in all or a part of the sensing fibre cores (16), eliminate interference through the comparison of the response of more than two sensing fibre cores (16) to the physical quantities to be detected in one and the same position, and improve the test accuracy. Also disclosed is a corresponding running method for the sensor based on the multi-core optical fibre.

The multi-core fiber of the present invention uses a multi-core fiber configuration, compatible with the “coupled” operation mode in which coupling between cores is positively utilized, to carry out mode division multiplexing transmission via a multi-core fiber that contains multiple single-mode cores in one optical fiber. The multi-core fiber of the present invention uses a configuration in which mode multiplexing transmission is carried out using a multi-core fiber that contains multiple single-mode cores in one optical fiber, wherein multiple cores are strongly coupled intentionally to form a coupled multi-core fiber that makes the coupled modes correspond, one to one, to the transmission channels.

Shape sensing with a multi-core fiber can achieve high accuracy as well as accommodate small bend radii by measuring signals with peripheral waveguide cores placed at multiple different radial distances from the center axis of the fiber, and computing strain metrics from signals of cores selected based on the respective radial distances and a determination of whether the waveguide cores have strained out of range.

A multi-core optical fiber apparatus is disclosed. The multi-core optical fiber apparatus includes a cladding comprising quartz and a plurality of cores embedded in the cladding. Each of the cores has a diameter (D) ranging from 1.3 μm to 2.0 μm, a numerical aperture (NA) from 0.35 to 0.45 and a refractive index profile factor (a) from 2.0 to 4.0. A center of each of the cores has a germanium content of 20 wt % to 30 wt %. An interval between adjacent cores is 3.0 μm or more.

The multi-core optical fiber amplifier according to an exemplary embodiment of the present invention having the above configuration includes: a double clad multi-core optical fiber including a plurality of cores, an internal cladding enclosing the plurality of cores, and an external cladding enclosing the internal cladding; a pumping light source outputting pumping light; an optical fiber to which pumping light from the pumping light source is input; and a wavelength division multiplexing coupler coupling the optical fiber with the double clad multi-core optical fiber to apply the pumping light input to the optical fiber from the pumping light source to the double clad multi-core optical fiber.

The present invention relates to a method of aligning circular multi-core fibers, wherein the method utilized independent and individually selected cores to receive, transmit, and emit light from input devices. The present invention further relates to positioning the ends of a multi-core fiber in order to detect and determine the precise locations of individually selected core fibers.

The invention provides satellite-type helical multi-core fiber optical micro-tweezers capable of achieving the rotation of small particles and a preparation method thereof. A laser source is connected with one end of a standard single-mode fiber, and the other end of the standard single-mode fiber is coupled with the satellite-type helical multi-core fiber by thermal-fused bi-conical taper to form a first thermal-fused bi-conical taper position; the satellite-type helical multi-core fiber is attached to an optical-path changing device, and the satellite-type helical multi-core fiber passing through the optical-path changing device is further subjected to the thermal-fused bi-conical taper operation to form a second thermal-fused bi-conical taper position; and the other end of the satellite-type helical multi-core fiber is prepared into a pyramidal shape in a processing manner of finely grinding. Therefore, the invention can save the physical space and greatly reduce the optical input power of the system, so as to reduce the damage on the particles to be trapped; the particles can be trapped in a more flexible, more accurate and adjustable manner; and the vortex-shaped optical trap can be naturally formed at the fiber end, thus achieving the rotation of the particles and the motor function of the operated particles.

The invention discloses a three-dimensional shape sensing measurement method and device based on multi-core fibers, and belongs to the technical field of fiber shape sensing measurement. According tocentral wavelengths of fiber Bragg gratings before and after shape change of the multi-core fibers, maximum strain of the fiber gratings and curvatures and torsion angles of the positions where the cross sections of the fiber gratings are located are calculated, interpolation of the curvatures and the torsion angles is conducted on the multi-core fibers, three-dimensional shape reconstitution is conducted through a three-dimensional reconstruction algorithm, then displaying on a computer is conducted, and three-dimensional shape sensing measurement of the multi-core fibers is achieved. The measurement device comprises the computer, a fiber grating sensing analyzer and a multi-core fiber fan-in and fan-out module. A full-fiber structure is combined with the fiber grating measurement strain,by changing the distance between every two adjacent fiber gratings and the number of the fiber gratings, the measurement precision can be improved, the mounting error is eliminated through the adopted multi-core fibers, later maintenance, replacement and mounting are facilitated, and reliability is higher.

A multi-core optical fiber which has a plurality of core portions arranged separately from one another in a cross-section perpendicular to a longitudinal direction, and a cladding portion located around the core portions, the multi-core optical fiber comprises a cylindrical portion of which diameter is even, and a reverse-tapered portion gradually expanding toward at least one edge in the longitudinal direction, wherein a gap between each adjacent ones of the core portions in the reverse-tapered portion is greater than that in the cylindrical portion.