1081results about "Multicore optical fibre" patented technology

A medical device operating as a stylet is described. The medical device can include an insulating layer (or sheath) encapsulating both a multi-core optical fiber and a conductive medium. The optical fiber can include a cladding and a plurality of core fibers spatially arranged within the cladding. Each of the core fibers can include a plurality of sensors distributed along a longitudinal length of that corresponding core fiber and each of these sensors can be configured to: (i) reflect a light signal of a different spectral width based on received incident light, and (ii) change a characteristic of the reflected light signal for use in determining a physical state of the multi-core optical fiber. The conductive medium can provide a pathway for electrical signals detected at a distal portion of the conductive medium. The conductive medium may be concentric to the cladding, but separate and adjust thereto.

An ultrasound imaging system configured to generate a three-dimensional (3D) ultrasound image of a target area. The ultrasound imaging system includes a console including one or more processors and non-transitory computer readable medium having stored thereon one or more logic modules, and an ultrasound probe configured to acquire a plurality of ultrasound images of a target area. The ultrasound probe can be coupled to the console by an ultrasound probe connector having optical fiber including one or more core fibers. The console is configured to generate the 3D ultrasound image by stitching together the plurality of ultrasound images, starting from a point of reference. The point of reference can be the ultrasound probe, one or more anatomical targets, an elongate medical device, a reference magnet, or one or more accelerometers.

The invention belongs to the technical field of optical fiber communication, and relates to an eight-mode mode division multiplexer based on a multi-core optical fiber, which comprises a substrate material and a central few-mode fiber core, a high-refractive-index ring is arranged in the central few-mode fiber core; the peripheral single-mode fiber core comprises a first single-mode fiber core used for carrying out LP11a mode conversion on the central few-mode fiber core, a second single-mode fiber core used for carrying out LP31 mode conversion on the central few-mode fiber core, a third single-mode fiber core used for carrying out LP11b mode conversion on the central few-mode fiber core, and a fourth single-mode fiber core used for carrying out LP21b mode conversion on the central few-mode fiber core; the fifth single-mode fiber core is used for carrying out LP12 mode conversion on the central few-mode fiber core; the sixth single-mode fiber core is used for carrying out LP21a mode conversion on the central few-mode fiber core; and the seventh single-mode fiber core is used for carrying out LP02 mode conversion on the central few-mode fiber core. The invention has the characteristics of large number of conversion modes, high space utilization rate, low insertion loss, high flux and the like.

A system and method directed to detecting placement of a medical device within a patient body, the system including a medical device including a multi-core optical fiber having a plurality of core fibers. Each of the plurality of core fibers can include a plurality of sensors each configured to reflect a light signal having an altered characteristic due to strain experienced by the multi-core optical fiber. The system can further include logic configured to determine a 3D shape of the medical device in accordance with the strain of the optical fiber. The logic can be configured to define a reference plane for the 3D shape and render an image of the 3D shape on a display of the system in accordance with the reference plane.

A multicore optical fiber (MCF) according to one embodiment of the present invention enables stable core identification. The MCF comprises a glass optical fiber and a resin coating. The glass optical fiber includes a plurality of cores, a marker, and cladding. On a cross-section of the MCF, the arrangement of the centers of the cores and the center of the marker has no rotational symmetry with respect to the center of the cross-section. The cladding includes an inner cladding that surrounds the cores and the marker, and an outer cladding that is provided on the outer peripheral surface of the inner cladding and has a refractive index higher than that of the inner cladding.

The invention discloses a multi-core all-solid-state anti-resonance optical fiber and a multi-wavelength optical fiber laser system. The multi-core all-solid-state anti-resonance optical fiber comprises an inner cladding area, at least two fiber core structures arranged in the inner cladding area and an outer cladding area or a coating layer area arranged on the periphery of the inner cladding area. Each fiber core structure comprises a fiber core area and an anti-resonance area, the anti-resonance area is composed of at least one capillary tube group, each capillary tube group comprises a plurality of capillary tubes, and the capillary tubes in each capillary tube group are annularly arranged on the periphery of the fiber core area by taking the fiber core area as the center; the optical fiber matrixes filled in the capillaries in the anti-resonance area are the same, and the refractive index of the anti-resonance area is n3gt; the refractive index n2 of the inner cladding region is equal to the refractive index n1gt of the fiber core region; and the refractive index of the outer cladding region or the coating layer region is n4. The optical fiber provided by the invention is beneficial to high-density integration of a fiber core structure in a multi-core optical fiber, has a large mode field area and a high-order mode rejection ratio, and gives consideration to both high power and high light beam quality.

The invention discloses an integrated optical fiber ultrasonic endoscope and a preparation method, and belongs to the field of ultrasonic sensors. Comprising a multi-core optical fiber, a dielectric film, a strip-shaped sensing layer, a mixed excitation inclined wedge, a sensibilization column and an endoscopic sheath. Double sensibilization is achieved through the sensibilization columns and the strip-shaped sensing layer, the sensitivity of lateral sensing is greatly improved, and good directivity is achieved on a film layer plane through the strip-shaped structure of the sensing layer. And the mixed excitation inclined wedges respectively realize side sound field excitation which is double and quadruple of that of the traditional single-mode optical fiber in two intensity directions. The problems that an existing optical fiber ultrasonic sensor is large in size, low in excitation power, low in integration level and low in sensitivity are solved.

A system, apparatus and method directed to detecting malposition of a medical device within a vessel of a patient, such as an Azygos vein. The medical device can include a multi-core optical fiber including a plurality of core fibers, where each of the plurality of core fibers includes a plurality of sensors is configured to reflect a light signal based on received incident light, and change a characteristic of the reflected light signal for use in determining a physical state of the multi-core optical fiber. The system can include a console having non-transitory computer-readable medium storing logic that, when executed, causes operations of providing a broadband incident light signal to the multi-core optical fiber, receiving reflected light signals, processing the reflected light signals, and determining whether the medical device has entered the Azygos vein of the patient based on the reflected light signals.

Provided is a multi-core fiber having an end surface whose inclination direction is appropriately set in consideration of connection. In a multi-core fiber (MF), inclination directions (v1, v2) of a first end surface (σ1) and a second end surface (σ2) are set so that, in a case where the first end surface (σ1) and the second end surface (σ2) are brought into contact with each other so as to minimize an angle made by an extending direction of cores (a1 to an) in the first end surface (σ1) and an extending direction of cores (a1 to an) in the second end surface (σ2), each of the cores (a1 to an) in the first end surface (σ1) at least partially overlaps any of the cores (a1 to an) in the second end surface (σ2).

A system, apparatus and method directed to placing a medical device into a body of a patient, including performing operations of providing a broadband incident light signal to a plurality of core fibers of a multi-core optical fiber, receiving reflected light signals of different wavelengths, and processing the reflected light signals associated with the plurality of core fibers to determine (i) a physical state of the multi-core optical fiber relating to the medical device including the multi-core optical fiber, and (ii) an orientation of the multi-core optical fiber relative to a reference frame of the body. Additional operations include generating a display illustrating the physical state of the multi-core optical fiber based at least on the orientation determined during processing of the reflected light. Typically, the display is a two-dimensional representation of the multi-core optical fiber in accordance with the determined orientation.

The invention discloses an isomorphic four-core hollow-core anti-resonance optical fiber for an ultraviolet band photoetching process, which belongs to the technical field of optical fiber communication, and comprises an outer cladding and four isomorphic hollow-core light guide units which are arranged in the outer cladding and are distributed at equal intervals in a rectangular array manner, anti-resonance structures are symmetrically arranged in each isomorphic hollow-core light guide unit in the vertical direction and the horizontal direction, and the anti-resonance structures enclose to form an air fiber core; the anti-resonance structure is formed by nesting a plurality of layers of circular and elliptical anti-resonance tubes. And the four isomorphic hollow-core light guide units respectively work in the wavelength ranges of 280 to 380 nm, 220 to 280 nm, 160 to 220 nm and 100 to 160 nm. The isomorphic four-core hollow-core anti-resonance optical fiber structure provided by the invention has a multi-channel transmission capability, and is suitable for multi-beam parallel transmission in a high-resolution ultraviolet lithography system.

In some implementations, an optical fiber may include a core and a cladding surrounding the core. The core and the cladding may provide light guidance along the optical fiber in a light propagation direction. The core may have a taper in the light propagation direction in a section of the optical fiber. A diameter of the core may decrease independently of a diameter of the cladding in the section of the optical fiber.

The invention discloses a dual-core anti-resonance optical fiber based on an ultra-wideband, and relates to the technical field of optical fiber communication. The optical fiber comprises an outer cladding, an upper fiber core unit and a lower fiber core unit from outside to inside, the upper fiber core unit comprises a first inner cladding, an upper fiber core is arranged at the center of the first inner cladding, a plurality of nested cladding tube assemblies are arranged in the circumferential direction of the first inner cladding at equal intervals, first oval cladding tubes are arranged between the adjacent nested cladding tube assemblies to fill gaps, the first oval cladding tubes and the nested cladding tube assemblies are not in contact, and the first oval cladding tubes are arranged in the first inner cladding. And the nested cladding tube assembly is externally tangent to the upper fiber core. The double-core hollow-core anti-resonance optical fiber has the advantages of the anti-resonance optical fiber, it is guaranteed that light has extremely low limiting loss in the transmission process from visible light to an optical communication wave band, and meanwhile the overall bending-resistant effect of light is remarkable.

A fiber-optic medical treatment apparatus comprising a medical treatment device and a disposable fiber-optic device, wherein the disposable fiber-optic device comprises an at least double-clad optical fiber having a proximal end and a distal end, the distal end being configured to be advanced through a working channel of an endoscope, wherein the at least double-clad optical fiber has at least one core and at least one cladding; wherein the medical treatment device comprises: a control unit configured to control operation of the medical treatment device; a treatment laser source configured to output treatment laser radiation for treatment of a medical condition; wherein the medical treatment apparatus is configured to output the treatment laser radiation through at least one of the two or more claddings of the at least doubled-clad optical fiber towards tissue to be treated.

The invention relates to an ultra-low-loss large-effective-area single-mode optical fiber, which comprises core layers and a cladding layer, and is characterized in that the core layer has two layers, the first core layer is the centermost core layer, the radius R1 of the first core layer is 1-2.5 microns, the relative refractive index difference delta n1 of the first core layer is 0.04-0.12%, the second core layer is arranged outside the first core layer, the radius R2 of the second core layer is 3.5-6.5 microns, the relative refractive index difference delta n2 of the second core layer is 0.08-0.12%, and the cladding layer is arranged outside the second core layer. The cladding layer comprises an inner cladding layer and an outer cladding layer, the inner cladding layer is a fluorine-doped silicon dioxide glass layer, the radius R3 of the inner cladding layer is 25-45 microns, the relative refractive index difference delta n3 of the inner cladding layer is-0.32%--0.20%, delta n2-delta n3 is larger than or equal to 0.32, the radius R4 of the outer cladding layer is 62.5 microns, the relative refractive index difference delta n4 of the outer cladding layer is-0.18%--0.10%, and delta n4-delta n3 is larger than or equal to 0. By optimizing the core cladding structure of the optical fiber, the attenuation is further reduced while the optical fiber has a relatively large effective area.

The present disclosure relates to an optical switch including a connection portion, a lens, and a mirror array. The lens is configured so that input light from the one or more multi-core optical fibers connected to the connection portion passes therethrough. The mirror array is configured so as to reflect the input light propagating through the lens toward the output end. Each of the one or more multi-core fibers is provided with a plurality of cores two-dimensionally arranged at a predetermined pitch so as to form a predetermined geometric shape. The mirror array is provided with a plurality of mirrors arranged two-dimensionally in a magnified geometric shape and pitch. Each of the plurality of mirrors is configured so as to be able to drive the reflecting surface so as to rotate the reflecting surface about two rotational axes.

An MCF includes a plurality of cores each extending in a direction along a central axis and a cladding covering each of the plurality of cores. The cladding includes a low refractive index barrier. The low refractive index barrier includes an alkali metal element. A relative refractive index of the low refractive index barrier is lower than an average value of a relative refractive indices of the cladding overall. The core interval is set such that a total sum of the power coupling coefficients between a specific core among the plurality of cores and each of all remaining cores is 2.3×10−4 / km or less.

The invention discloses a non-zero dispersion displacement ring core optical fiber based on groove assistance, and the non-zero dispersion displacement ring core optical fiber is a single-ring-core gradient refractive index ring core optical fiber, and comprises an annular fiber core, an annular groove, and an optical fiber cladding. The optical fiber cladding comprises a central cylinder, an annular fiber core, an annular groove interlayer and an outer optical fiber cladding, and all the layers have the same refractive index; the annular fiber core with the high refractive index is sleeved on the central cylinder, the annular fiber core and the annular groove interlayer are sleeved on the annular fiber core, the annular groove with the low refractive index is sleeved on the annular fiber core and the annular groove interlayer, and the outer fiber cladding is sleeved on the annular groove. The invention aims to provide a low-crosstalk optical fiber structure so as to meet the requirement of low-dispersion transmission in a plurality of orbital angular momentum modes.

A multi-core optical fiber includes four cores each extending along a center axis of the multi-core optical fiber, common cladding enclosing the four cores and having a lower refractive index than each of the four cores and coating resin enclosing the common cladding. The common cladding has a diameter of 124.5 μm to 125.5 μm. For each of the four cores, letting an effective area at a wavelength of 1550 nm be Aeff [μm2] and a cable cutoff wavelength be λcc [μm], Aeff satisfies Expression (1) and Expression (2) while λcc satisfies Expression (1) and Expression (3). The four cores are arranged such that Dc satisfies Expression (4) in relation to Aeff and λcc of each of the first core and the second core while OCT, Aeff, and λcc of the first core satisfy Expression (5).

An antiresonant hollow core optical fibre (30) comprises: an outer jacket (12); cladding capillaries comprising a plurality of primary capillaries (14) which are each bonded to a surface of a cavity (34) within the outer jacket (12); and at least two hollow cores (18a,18b), each hollow core (18a,18b) formed by a void defined within a ring comprising a maximum of four primary capillaries, each primary capillary (14) of the ring being spaced apart from adjacent primary capillaries (14) around the ring.

An object is to provide a multi-core configuration for acquiring a random mode coupling in a case of an arbitrary core refractive index.A multi-core optical fiber according to the present invention is an optical fiber in which two or more core regions are arranged in a clad region having a refractive index at a minimum core interval Λ smaller than a refractive index of the cores, a configuration of the cores is that including one propagation mode, and the core configuration and the core interval are adjusted so that an inter-mode coupling coefficient between adjacent cores is within a range from 0.73 to 120 m−1.

The invention relates to a waveguide (1) for transmitting electromagnetic waves, in particular for transmitting image information from a proximal end (2) of the waveguide to a distal end (4) of the waveguide, along a transport direction (5) extending between the proximal and distal ends, and over a cross-section extending transversely to the transport direction, wherein light may be transmitted through the waveguide (1) by Anderson localization, and wherein the waveguide (1) has an improved properties compared to conventional fiber optic bundles.

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.

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.

The invention provides a multi-core optical fiber, a parallel optical transmission optical module and an optical interconnection system, which can solve the problem of high operation and maintenance cost caused by coexistence of PSM and WDM optical modules and non-uniform optical module interface and optical fiber wiring in the prior art, the multi-core optical fiber comprises a multi-core optical fiber, the size of a central fiber core is the same as that of a single-mode optical fiber, and the optical interconnection system comprises a single-mode optical fiber and a single-mode optical fiber. The wavelength division multiplexing module is used for transmitting wavelength division multiplexing optical signals; the plurality of peripheral fiber cores are arranged around the central fiber core and are used for transmitting multiple paths of parallel optical signals; an optical interface of the parallel optical transmission optical module is connected with a peripheral fiber core of the multi-core optical fiber, and the parallel optical transmission optical module is used for transmitting multiple paths of parallel optical signals through the peripheral fiber core; the wavelength division multiplexing optical module is provided with a single-channel optical interface, and the single-channel optical interface is connected with the central fiber core of the multi-core optical fiber and used for transmitting wavelength division multiplexing optical signals through the central fiber core.

The invention provides a multi-point distributed temperature detection method and system based on a multi-core optical fiber structure. Wherein grating array etching processing is carried out on at least three fiber cores to form a specific reflection wavelength interval; when an external light source is incident, the fiber core grating structures reflect optical signals with corresponding wavelengths to generate reflected optical signals with different wavebands; the method comprises the following steps: dividing a reflected light signal channel through a wavelength branching device, generating independent channel signals of each fiber core, and simultaneously carrying out time sequence separation on multi-grating signals in the same fiber core to obtain reflected signals in discrete time sequence distribution; combining the independent channel signal with the discrete reflection signal, performing interference comparison with the fixed wavelength reference optical signal, generating a phase difference interference signal reflecting wavelength shift, and analyzing the wavelength shift to obtain temperature-related wavelength shift data; and through analysis and stress error elimination under deformation constraint, outputting a temperature detection result. According to the technical scheme provided by the invention, the accuracy of distributed temperature detection is improved.

The invention concerns an apparatus and its use for laser welding. A laser welding apparatus comprise at least one first laser device, each providing at least one first optical feed fiber with a first laser beam; at least one second laser device, each providing at least one second optical feed fiber with a second laser beam; means for generating a composite laser beam comprising a first output laser beam and a second output laser beam for welding a workpiece; wherein the first output laser beam has a circular cross-section and the second output laser beam has an annular shape concentric to the first output laser beam. The second laser device is a fiber laser device or a fiber-coupled laser device. The apparatus is configured to form the second output laser beam at least on the basis of the second laser beam, and the second output laser beam comprises a first wavelength and a second wavelength having difference of at least 10 nanometers, or the second output laser beam has spectrum width of least 10 nanometers.

The invention belongs to the technical field of optical fiber sensors, and discloses an optical fiber SPR (Surface Plasmon Resonance) sensor and a preparation method thereof. The optical fiber SPR sensor provided by the invention comprises a first optical fiber, a capillary optical fiber and a multimode optical fiber, the first optical fiber is an optical fiber capable of realizing double-path optical transmission, the surface of the capillary optical fiber is plated with a metal film, and two ends of the capillary optical fiber are respectively welded with the first optical fiber and the multimode optical fiber; an optical signal transmitted along a first path of the first optical fiber enters the inner wall of the capillary optical fiber to be totally reflected, and interacts with the metal film to generate SPR (Surface Plasmon Resonance) which is received by the multimode optical fiber for external refractive index sensing; and the optical signal transmitted along the second path of the first optical fiber enters the air cavity of the capillary optical fiber and is received by the multimode optical fiber after passing through the air cavity, and the two paths of optical signals at the output end form Mach-Zehnder interference for external temperature sensing. According to the invention, external refractive index and temperature change can be measured at the same time, cross-talk can be avoided, and high sensitivity is achieved.

The invention relates to the technical field of seismic exploration equipment, in particular to an optical fiber signal transmission seismic cable for seismic exploration. A power line, a twisted-pair shielding signal line and an optical fiber beam tube are wrapped outside the high-pressure plastic composite hose in a cabling mode, and the power line, the twisted-pair shielding signal line and the optical fiber beam tube jointly form a cable core structure. An outer layer non-woven fabric is wrapped outside the cable core structure, a polyurethane inner sheath is extruded outside the outer layer non-woven fabric, an armor layer is wrapped outside the polyurethane inner sheath, and a polymer polyethylene sheath is extruded outside the armor layer. According to the high-pressure plastic composite hose, through the design of the double reinforcing layers of the Kevlar aramid fibers and the polyester fibers, the strength and bursting pressure of the central air pipe are remarkably improved, and the high-pressure plastic composite hose can better adapt to the complex working environment; the cable core structure adopts composite optical fiber analog signal transmission to replace a traditional digital signal seismic cable, so that the quality and efficiency of signal transmission are improved; and the armor layer adopts a double-layer steel wire armor structure, so that the overall mechanical strength and tensile property of the cable are improved.

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.