Patents Assigned to Fujikura Ltd.
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Publication number: 20230176267Abstract: An optical computing system includes: an intensity modulation device group including at least two intensity modulation devices, each of which includes modulation cells, wherein each of the modulation cells of each of the intensity modulation devices carries out intensity modulation with respect to carrier light in accordance with one of signals to generate a signal light beam, and each of the signals corresponds to each of the intensity modulation devices; and a light diffraction element including diffraction cells having respective thicknesses or refractive indices set independently of each other, wherein each of the diffraction cells receives the signal light beam from each of the modulation cells of each of the intensity modulation devices corresponding to each of the diffraction cells, and by causing signal light beams to have respective different optical path lengths to the light diffraction element, the signal light beams have respective different phases.Type: ApplicationFiled: August 18, 2021Publication date: June 8, 2023Applicant: FUJIKURA LTD.Inventors: Hiroyuki Kusaka, Masahiro Kashiwagi
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Publication number: 20230180377Abstract: A cleaning tool includes: a tool body; and an extension part extending from the tool body and including a head configured to press a cleaning body against a cleaning target. The head includes a conductor part made of a conductor.Type: ApplicationFiled: April 13, 2021Publication date: June 8, 2023Applicant: Fujikura Ltd.Inventors: Yuya Sakaguchi, Shunsuke Fujita, Kunihiko Fujiwara
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Publication number: 20230176285Abstract: An optical fiber cutter includes: a fiber holder that holds optical fibers disposed in a row in a first perpendicular direction perpendicular to a longitudinal direction of the optical fibers, wherein each of the optical fibers includes a glass portion and a coated portion that covers the glass portion; an alignment member having an insertion hole through which the glass portions extending from the fiber holder are inserted; a base including; a first placement portion on which the fiber holder is disposed; and a second placement portion positioned at a distance from the first placement portion, and on which the alignment member is disposed; and a blade member that scratches surfaces of the glass portions by moving in the first perpendicular direction between the first placement portion and the second placement portion with respect to the base.Type: ApplicationFiled: February 15, 2021Publication date: June 8, 2023Applicant: Fujikura Ltd.Inventors: Yuuko Tachibana, Ryo Hasegawa, Yoshiharu Kanda
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Patent number: 11667560Abstract: A manufacturing method for an optical fiber, includes: drawing, while heating in a heating furnace, a lower end of an optical fiber preform that is to be an optical fiber having a core consisting of silica glass containing a rare earth element compound. The heating furnace has a temperature profile in which a temperature of the heating furnace increases to a maximum temperature Tmax and then decreases from an upstream side of the heating furnace toward a downstream side of the heating furnace. The temperature profile has a changing point at which the temperature decreases more steeply on the downstream side from a position where the maximum temperature Tmax is reached. At the maximum temperature, a temperature of the silica glass is higher than or equal to a glass transition temperature and the silica glass is in a single phase.Type: GrantFiled: September 17, 2019Date of Patent: June 6, 2023Assignee: Fujikura Ltd.Inventor: Tsukasa Hosokawa
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Publication number: 20230161125Abstract: An optical fiber cable includes: optical fiber units each comprising optical fibers, and twisted together in an SZ shape; a wrapping tube that wraps around the optical fiber units; fillings disposed inside the wrapping tube, wherein the fillings include at least one first filling and at least one second filling that are located between two adjacent optical fiber units; and a sheath that covers the wrapping tube. The first filling is in contact with the wrapping tube. The second filling is located more radially inward than the first filling in a radial direction.Type: ApplicationFiled: January 19, 2023Publication date: May 25, 2023Applicant: Fujikura Ltd.Inventors: Shinnosuke Sato, Mizuki Isaji, Koji Tomikawa, Ken Osato
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Publication number: 20230161126Abstract: An optical cable traction terminal structure includes: a helically wound inner tube that houses an optical cable; and a flexible outer tube disposed on an outer circumferential surface of the helically wound inner tube, wherein a part of the flexible outer tube enters an inside of a groove on the outer circumferential surface of the helically wound inner tube.Type: ApplicationFiled: April 13, 2021Publication date: May 25, 2023Applicant: Fujikura Ltd.Inventors: Ryoichi Mitobe, Kansei Shindo
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Patent number: 11658419Abstract: An antenna includes: a dielectric laminated body including a plurality of dielectric layers being laminated; a dielectric substrate bonded to one of surfaces of the dielectric laminated body; and a radiation element pattern layer, a conductive ground layer, and a conductive pattern layer each formed in a different place in any of both the surfaces and between the dielectric layers of the dielectric laminated body. The radiation element pattern layer, the conductive ground layer, and the conductive pattern layer are formed in an order of the radiation element pattern layer, the conductive ground layer, and the conductive pattern layer from a dielectric substrate side toward an opposite side. The radiation element pattern layer includes one or more radiation elements, the conductive pattern layer includes a feed line configured to feed power to the radiation elements, the dielectric laminated body is flexible, and the dielectric substrate is rigid.Type: GrantFiled: November 29, 2019Date of Patent: May 23, 2023Assignee: FUJIKURA LTD.Inventor: Yuta Hasegawa
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Patent number: 11656402Abstract: An optical fiber includes a core that propagates a light that includes a wavelength equal to or larger than 1000 nm and equal to or smaller than 1100 nm. The light propagates in the core at least in an LP01 mode and an LP11 mode. A difference between a propagation constant of the light in the LP01 mode and a propagation constant of the light in the LP11 mode is 1735 rad/m or larger and 4000 rad/m or smaller.Type: GrantFiled: December 27, 2018Date of Patent: May 23, 2023Assignee: Fujikura Ltd.Inventors: Rintaro Kitahara, Tatsuya Kishi
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Publication number: 20230152548Abstract: An optical cable includes: twisted optical fiber units each including a fiber group formed by optical fibers. At least one of the optical fiber units includes a filling that wraps an outer circumference of the fiber group.Type: ApplicationFiled: January 17, 2023Publication date: May 18, 2023Applicants: FUJIKURA LTD., NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Masatoshi Ohno, Akira Namazue, Ken Osato, Yusuke Yamada, Yuta Maruo, Akira Sakurai, Shigekatsu Tetsutani, Hiroaki Tanioka
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Patent number: 11647893Abstract: An endoscope includes an insertion observation portion including a distal end portion to be inserted into a target object; an objective lens portion disposed on the distal end portion of the insertion observation portion and includes a lens; a holding member that holds the objective lens portion; a sheath that covers the objective lens portion and the holding member; and a sealing material that is disposed on an outer circumference of the objective lens portion and that shields light. A part of the sealing material is disposed on an inner side of a recessed portion of the lens and forms a diaphragm portion that widens a depth of field of the endoscope.Type: GrantFiled: March 24, 2021Date of Patent: May 16, 2023Assignees: Fujikura Ltd., FiberTech Co., Ltd.Inventor: Yusuke Matsuda
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Publication number: 20230141383Abstract: A housing structure includes: an optical cable including optical fibers; connector units branching off from the optical cable; and a housing body that houses the connector units. Each of the connector units includes: a first tube through which the optical fibers pass; second tubes through each of which the optical fibers branching off from the first tube pass; and a connector group constituted by optical connectors that are each disposed at an end part of each of the second tubes. The connector group of each of the connector units is disposed at a different position in a length direction from the connector group of any other one of the connector units. The first tube of each of the connector units other than a first connector unit that is shortest among the connector units overlaps in the length direction the connector group of the first connector unit.Type: ApplicationFiled: February 15, 2021Publication date: May 11, 2023Applicant: FUJIKURA LTD.Inventors: Ryoichi Mitobe, Kansei Shindo
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Patent number: 11644632Abstract: Provided is a method of manufacturing an optical device that includes a multicore fiber including a plurality of cores and a fan-in/fan-out device including single-core fibers that are respectively connected to the cores based on a plurality of connection combinations when the multicore fiber is rotated. The method includes: a first step of determining an optical loss for each of the cores while changing the connection combinations between the single-core fibers and the cores; and a second step of selecting one of the connection combinations according to a result of the first step and connecting an end portion of the multicore fiber and an end portion of the fan-in/fan-out device to connect the single-core fibers with the cores based on the one of the connection combinations.Type: GrantFiled: October 23, 2017Date of Patent: May 9, 2023Assignee: Fujikura Ltd.Inventors: Kenichi Ohmori, Norihiro Ishikura, Hitoshi Uemura
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Publication number: 20230126510Abstract: An oxide superconducting wire includes: a superconducting laminate comprising a substrate and an oxide superconducting layer; and a stabilization layer made of copper plating formed around the superconducting laminate. A thickness d of the stabilization layer is in the range of 10 to 40 ?m. A ratio Ra/d of the thickness d of the stabilization layer and an arithmetic mean roughness Ra of an outer surface of the stabilization layer is in the range of 0.005 to 0.03. An intermediate layer is arranged between the substrate and the oxide superconducting layer. When a tensile test of pulling the oxide superconducting wire in a longitudinal direction within a stress range of 180 to 600 MPa in liquid nitrogen is performed, a ratio of a critical current when a repeated pulling number reaches 100,000 times and an initial critical current measured before the tensile test is 0.99 or more.Type: ApplicationFiled: April 6, 2020Publication date: April 27, 2023Applicant: Fujikura Ltd.Inventor: Shinji Fujita
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Publication number: 20230131853Abstract: A piezoelectric coaxial sensor includes: a sensor portion including a center conductor having a linear shape, a polymer piezoelectric layer containing polyvinylidene fluoride and that covers an outer peripheral surface of the center conductor, and a first outer conductor that surrounds an outer peripheral surface of the polymer piezoelectric layer; and jacket layers that each include a film having a tape shape wound to surround an outer peripheral surface of the sensor portion. The film of at least one of the jacket layers exposed to the outside of the piezoelectric coaxial sensor among the other jacket layers is adhered to a member in contact with an adhesive layer by the adhesive layer. The adhesive layer includes a thermoplastic resin having a melting point of 120° C. or lower.Type: ApplicationFiled: March 3, 2021Publication date: April 27, 2023Applicant: Fujikura Ltd.Inventors: Sho Ueda, Haruhiko Tsuboi, Korenari Higashi
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Patent number: 11635581Abstract: An optical fiber unit includes: a first optical fiber ribbon that intermittently connects a first plurality of optical fibers; a second optical fiber ribbon that intermittently connects a second plurality of optical fibers; and interlayer connection parts that intermittently connect the first optical fiber ribbon and the second optical fiber ribbon in a length direction while the first optical fiber ribbon and the second optical fiber ribbon are layered and arranged. The first optical fiber ribbon and the second optical fiber ribbon are layered and arranged such that optical fibers having a same fiber number of the first optical fiber ribbon and the second optical fiber ribbon are aligned in a up-down direction perpendicular to the length direction.Type: GrantFiled: November 5, 2019Date of Patent: April 25, 2023Assignee: Fujikura Ltd.Inventors: Ryo Kuramitsu, Koji Tomikawa, Ken Osato
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Patent number: 11638351Abstract: A component-embedded substrate includes: insulating layers each including a wiring pattern; an embedded component including a connection terminal; a plurality of vias that electrically connect the connection terminal to the wiring patterns adjacent to each other in a lamination direction. Each of the vias is composed of a via hole in the insulating layer and a conductive material in the via hole. One of the vias is a connection via connected to the connection terminal, and another of the vias is an adjacent via adjacent to the connection via in the lamination direction. The connection via and adjacent via overlap in a plan view. S1/A1?0.61 and S1/A2?0.61 are satisfied, where A1 is an average cross-sectional area of the connection via, A2 is an average cross-sectional area of the adjacent via, and S1 is an overlapping area of the connection via and adjacent via in the plan view.Type: GrantFiled: June 12, 2019Date of Patent: April 25, 2023Assignee: Fujikura Ltd.Inventors: Masakazu Sato, Nobuki Ueta, Yoshio Nakao, Masatoshi Inaba
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Patent number: 11621105Abstract: An oxide superconducting wire includes a superconducting laminate including an oxide superconducting layer disposed, either directly or indirectly, on a substrate, and a stabilization layer which is a Cu plating layer covering an outer periphery of the superconducting laminate. An average crystal grain size of the Cu plating layer is 3.30 ?m or more and equal to or less than a thickness of the Cu plating layer.Type: GrantFiled: March 16, 2020Date of Patent: April 4, 2023Assignee: Fujikura Ltd.Inventor: Masaki Ohsugi
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Publication number: 20230088741Abstract: An optical fiber includes a core and a cladding. An effective area Aeff of light of a fundamental mode, having a wavelength of 1070 nm and propagating through the core, is 500 ?m2 or more. A numerical aperture NA of the core satisfies the following formula: NA?(1.3×10?11×a4/b6)1/6 where a (m) is a radius of the core and b (m) is a radius of the cladding. A V value, that is a waveguide parameter of the optical fiber, satisfies the following formula: V?1.3583×b?0.2555.Type: ApplicationFiled: December 24, 2020Publication date: March 23, 2023Applicant: Fujikura Ltd.Inventor: Rintaro Kitahara
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Patent number: 11609380Abstract: A laser device includes: a laser unit that outputs laser light; an output end that launches the laser light; a first fusion splice portion; and a second fusion splice portion. In each of the first fusion splice portion and the second fusion splice portion, two multi-mode fibers are fusion-spliced. Each of the two multi-mode fibers include a core through which the laser light propagates and a cladding that surrounds the core. The first fusion splice portion is disposed closer to the laser unit than is the second fusion splice portion. At least a part of the core in the first fusion splice portion contains a dopant that is the same type as a dopant contained in the cladding in the first fusion splice portion for decreasing a refractive index.Type: GrantFiled: March 11, 2020Date of Patent: March 21, 2023Assignee: FUJIKURA LTD.Inventors: Yutaka Yamaguchi, Shinichi Sakamoto, Yasuto Chiba, Tatsuya Kishi
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Publication number: 20230082843Abstract: An optical receptacle includes: a first optical fiber; a second optical fiber connected to the first optical fiber by fusion splice; a ferrule including a fiber hole that holds an end of the first optical fiber; and a housing portion that houses therein: the ferrule, the first optical fiber, and a first portion of the second optical fiber. A fusion splice portion between the first optical fiber and the second optical fiber is disposed outside of the ferrule and within the housing portion.Type: ApplicationFiled: November 4, 2020Publication date: March 16, 2023Applicant: FUJIKURA LTD.Inventors: Hau Huu Tran, Satoshi Shida