Patents Assigned to Fujikura Ltd.
  • Publication number: 20210231900
    Abstract: An optical fiber cable includes: an optical fiber; a sheath that accommodates the optical fiber; a tension member that extends from an end portion of the sheath; a housing disposed at an end portion of the tension member; and an anchor portion disposed on the tension member. The anchor portion increases a projected area of the tension member when viewed from a longitudinal direction of the optical fiber cable, the anchor portion is inside the housing, and the housing is filled with a filler that fixes the anchor potion to the housing.
    Type: Application
    Filed: November 30, 2020
    Publication date: July 29, 2021
    Applicant: Fujikura Ltd.
    Inventors: Shuhei Kanno, Ryoichi Mitobe
  • Publication number: 20210230058
    Abstract: A method for manufacturing an optical fiber, the method includes: exposing a bare fiber formed of glass and having a temperature of 500° C. to 1,500° C. to a gas in which a moisture content is controlled to 2 to 20 g/m3; applying an uncured resin to an outer periphery of the bare fiber; and curing the resin to form a coating layer.
    Type: Application
    Filed: January 27, 2021
    Publication date: July 29, 2021
    Applicant: Fujikura Ltd.
    Inventors: Kenji Yamashiro, Miryo Kashiwazaki
  • Publication number: 20210223491
    Abstract: An optical fiber cable includes: a sheath; and a core that is housed in the sheath and includes an intermittently-adhered optical fiber ribbon including optical fibers and adhesive portions for intermittently adhering the optical fibers in a longitudinal direction. Recesses and protrusions are disposed alternately in a circumferential direction on an outer circumferential surface of the sheath. The recesses each include: two connecting portions respectively connected to radial inner ends of two adjacent protrusions; and a bottom surface positioned between the two connecting portions.
    Type: Application
    Filed: October 9, 2019
    Publication date: July 22, 2021
    Applicant: Fujikura Ltd.
    Inventors: Shogo Shimizu, Akira Namazue, Ken Osato
  • Patent number: 11067753
    Abstract: An optical module includes: a substrate-type optical waveguide device; and an optical fiber that guides light that enters or exits the waveguide device. Spot sizes w1 and w2 satisfy 1<w2/w1<?; w1 is a spot size: on an end surface of the substrate-type optical waveguide device, and of a waveguide mode guided through a core of the substrate-type optical waveguide device, w2 is a spot size: on an end surface of the optical fiber, and of a waveguide mode guided through a core of the optical fiber, and a is a spot size ratio w2/w1 at which an efficiency ?(0) is equal to the efficiency ?(0) when w2/w1=1.
    Type: Grant
    Filed: April 2, 2018
    Date of Patent: July 20, 2021
    Assignee: Fujikura Ltd.
    Inventor: Takuya Oda
  • Patent number: 11070021
    Abstract: A seed unit (MO) includes a plurality of optical paths sharing a part thereof and causing light to be resonated thereon, an amplification optical fiber (13) serving as a part of each of the optical paths and amplifying respective light beams resonated on the respective optical paths, and; an AOM (14) arranged at a part shared by the respective optical paths and switchable between a first state, in which the AOM (14) vibrates at a predetermined cycle and emits light incident from the optical paths to the optical paths, and a second state, in which the AOM (14) emits light incident from the optical paths to a path other than the optical paths. A resonance cycle of light having highest power out of the light beams resonated on the optical paths and the predetermined cycle at which the AOM (14) vibrates in the first state have a non-integral multiple relationship.
    Type: Grant
    Filed: October 18, 2017
    Date of Patent: July 20, 2021
    Assignee: FUJIKURA LTD.
    Inventors: Ren Suzuki, Naoki Murakoshi
  • Patent number: 11065778
    Abstract: An optical fiber cutter includes a base that includes a pair of clamps, a blade member moving base that includes a disk-shaped blade member and is configured to move the blade member and bring an outer circumferential edge of the blade member into contact with a surface of the optical fiber, and a pressing that press-bends a scratched portion of the optical fiber to cut the optical fiber. The blade member is rotatably fixed to the blade member moving base to change a position of the outer circumferential edge to be in contact with the optical fiber. The base further includes a rotating member that is rotatably fixed to the base and configured to rotate to transmit power to rotate the blade member, and power transmission between the blade member and the rotating member is releasable.
    Type: Grant
    Filed: April 7, 2017
    Date of Patent: July 20, 2021
    Assignee: Fujikura Ltd.
    Inventor: Katsumi Sasaki
  • Patent number: 11061189
    Abstract: There is provided an optical fiber protection structure capable of mitigating deterioration of optical characteristics of an optical fiber under a high-temperature environment and a method of manufacturing an optical element using the same. An optical combiner structure protects bare fiber exposure portions in which bare fibers are exposed from the coverings of optical fibers. The optical combiner structure has a fiber accommodation portion having a fiber accommodation groove that accommodates the bare fiber exposure portions therein, fixation resins filled within the fiber accommodation groove for fixing a portion of the coverings within the fiber accommodation groove, and seal resins for sealing spaces between the bare fibers and the coverings on ends of the bare fiber exposure portions. The seal resins are formed so as to be spaced from an inner surface of the fiber accommodation groove.
    Type: Grant
    Filed: February 21, 2017
    Date of Patent: July 13, 2021
    Assignee: FUJIKURA LTD.
    Inventors: Hiroto Nakazato, Tomoyuki Fujita, Kazuya Ishida
  • Publication number: 20210208343
    Abstract: An optical-fiber-attached ferrule includes: an optical fiber hole into which an optical fiber is inserted and fixed with a first adhesive; and an adhesive-filling section including an opening surface and an opposed surface opposite the opening surface. The adhesive-filling section is filled with a second adhesive that is softer than the first adhesive with an end surface of the optical fiber positioned closer to the opposed surface than to the opening surface.
    Type: Application
    Filed: March 15, 2017
    Publication date: July 8, 2021
    Applicant: FUJIKURA LTD.
    Inventors: Akihiro Nakama, Shigeo Takahashi, Hirotaka Asada
  • Patent number: 11054572
    Abstract: A filter device including a filter and waveguide tubes broadens a band in which return loss is small. A filter device (1) includes: a filter (11) including wide walls (13, 14) and narrow walls (16); and first and second waveguide tubes (21, 31). The filter 11 includes first and second columnar conductors (pins 18 and 19) each passing through an opening (13a1 or 13a2) which is provided in the wide wall (conductor layer 13) and having one end portion (181, 191) located inside the substrate (12). The first and second waveguide tubes (21, 31) are placed such that each of the first and second columnar conductors (pin 18, 19) passes through an opening (22a, 23a) and such that another end portion (182, 192) of each of the columnar conductors (pin 18, 19) is located inside the waveguide tube (21, 31).
    Type: Grant
    Filed: May 29, 2018
    Date of Patent: July 6, 2021
    Assignee: FUJIKURA LTD.
    Inventor: Yusuke Uemichi
  • Patent number: 11054589
    Abstract: An optical connector includes: an optical receptacle; and an optical plug that is attachable to and detachable from the optical receptacle. The optical receptacle includes receptacle-side connector modules that each include: an outer housing; an inner housing; a receptacle-side ferrule housed in the inner housing; and a receptacle-side spring that applies pressure to the receptacle-side ferrule. The optical plug includes plug-side connector modules that each include: a plug-side housing; a plug-side ferrule housed in the plug-side housing; and a plug-side spring that applies pressure to the plug-side ferrule. The inner housing includes an engagement section. The plug-side housing includes an engaged section.
    Type: Grant
    Filed: December 28, 2017
    Date of Patent: July 6, 2021
    Assignees: Fujikura Ltd., NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Takahito Otomitsu, Mitsuru Kihara, Ryo Koyama
  • Publication number: 20210202132
    Abstract: An oxide superconducting wire connection structure includes: connection target wires, each of which includes an oxide superconducting wire including a superconducting layer on a substrate; and connection superconducting wires that connects the connection target wires. The connection superconducting wires are narrower in width than the connection target wires. Current characteristics of the connection superconducting wires are equal to or greater than current characteristics of the connection target wires.
    Type: Application
    Filed: October 12, 2018
    Publication date: July 1, 2021
    Applicant: Fujikura Ltd.
    Inventor: Naonori Nakamura
  • Publication number: 20210204414
    Abstract: A component-incorporated substrate of multi-layer structure includes: a plurality of printed wiring base members that are batch-laminated via an adhesive layer, with the plurality of printed wiring base members including a resin base member that includes a wiring pattern on at least one surface thereof and a via connected to the wiring pattern; an opening disposed in at least one printed wiring base member that is sandwiched on both sides by other printed wiring base members of the plurality of printed wiring base members; and an electronic component disposed in the opening. At least part of the wiring pattern of the printed wiring base member where the opening is formed is disposed in a frame shape surrounding the opening, in a periphery of the opening.
    Type: Application
    Filed: August 21, 2017
    Publication date: July 1, 2021
    Applicant: FUJIKURA LTD.
    Inventor: Masahiro Okamoto
  • Publication number: 20210199891
    Abstract: An optical device includes: first optical fibers, a second optical fiber, a fiber connection portion, a fiber support portion; and a fixation resin that fixes the first optical fibers to the fiber support portion. The first optical fibers form a tapered portion including a taper initiation portion and a taper body reduced in diameter toward the fiber connection portion. The core of the second optical fiber has a core exposure area exposed outside of the first optical fibers. At least a portion of a periphery of the fixation resin is disposed closer to an optical axis of the second optical fiber than to a first reference line that is an extension of a line that passes through a closest point of the taper initiation portion to the optical axis on a plane perpendicular to the optical axis.
    Type: Application
    Filed: September 19, 2019
    Publication date: July 1, 2021
    Applicant: FUJIKURA LTD.
    Inventor: Ryokichi Matsumoto
  • Publication number: 20210199895
    Abstract: An optical connector system includes: a first optical connector including a first ferrule and a first housing that houses the first ferrule; and a second optical connector including a second ferrule that connects to the first ferrule, a second inner housing that houses the second ferrule, and a second outer housing that houses the second inner housing. The second optical connector detachably connects to the first optical connector. The first housing includes a latch receptacle and a latch releaser. The second inner housing includes a front latch that latches to the latch receptacle and a rear latch that latches to the second outer housing.
    Type: Application
    Filed: May 20, 2019
    Publication date: July 1, 2021
    Applicant: FUJIKURA LTD.
    Inventor: Takahito Otomitsu
  • Patent number: 11050130
    Abstract: Provided is a dielectric waveguide having a good reflection characteristic also in a band on a low frequency side of a center frequency of a given operation band. A dielectric waveguide (1) includes: a waveguide region (12) which is defined by a first wide wall (21), a second wide wall (22), a first narrow wall (23), a second narrow wall (24), and a short wall (25) and which is filled with a dielectric; and a mode conversion section (31) which includes a columnar conductor (34) extending from a surface of the waveguide region (12) toward an inside of the waveguide region (12). A width (W2) of the short wall (25) is configured to be greater than a waveguide width (Wi) at a location (x=x1) at which the columnar conductor (34) is provided.
    Type: Grant
    Filed: October 26, 2018
    Date of Patent: June 29, 2021
    Assignee: FUJIKURA LTD.
    Inventor: Yusuke Uemichi
  • Patent number: 11048039
    Abstract: An optical fiber includes: a core; a depressed layer surrounding the core; and a cladding surrounding the depressed layer. A refractive index profile of the core is an ?-th power distribution having an index ? of 1.0 or more and 2.9 or less. A relative refractive index difference ?? of the depressed layer with respect to the cladding has an absolute value |??| that is 0.05% or more and 0.15% or less. A ratio r1/r2 of a radius r1 of the core to an outer radius r2 of the depressed layer is 0.35 or more and 0.60 or less. A cable cutoff wavelength ?cc of 22 m is less than 1.26 ?m. A mode field diameter at a wavelength of 1.31 inn is larger than 8.6 inn and smaller than 9.5 ?m.
    Type: Grant
    Filed: February 1, 2019
    Date of Patent: June 29, 2021
    Assignee: Fujikura Ltd.
    Inventor: Ryo Maruyama
  • Patent number: 11048054
    Abstract: An optical fiber cable includes: a core; an outer filling disposed outside the core; and a sheath that covers the core and the outer filling. The core includes: optical fibers; an inner filling; and a wrapping tube that wraps the optical fibers and the inner filling. The outer filling and the inner filling absorb water.
    Type: Grant
    Filed: May 9, 2018
    Date of Patent: June 29, 2021
    Assignee: Fujikura Ltd.
    Inventors: Shogo Shimizu, Akira Namazue, Go Taki, Ken Osato
  • Patent number: 11048043
    Abstract: An optical fiber fusion-splicer that fusion-splices at least a pair of optical fibers that includes: a pair of electrode rod units each having a pointed end portion that faces each other and a pair of mounting bases that each support the electrode rod units. Abutting portions of the optical fibers are interposed between the pair of electrode rod units. Each of the electrode rod units includes: an electrode rod that fusion-splices the optical fibers by discharge heating and a main heat dissipation member that protrudes from an outer circumferential surface of the electrode rod. Each of the pair of mounting bases supports a position of the electrode rod units that is closer to a base end side than a pointed end portion of the electrode rod.
    Type: Grant
    Filed: April 17, 2018
    Date of Patent: June 29, 2021
    Assignee: Fujikura Ltd.
    Inventors: Noriyuki Kawanishi, Makoto Iwamatsu
  • Publication number: 20210194105
    Abstract: Provided is a dielectric waveguide having a good reflection characteristic also in a band on a low frequency side of a center frequency of a given operation band. A dielectric waveguide (1) includes: a waveguide region (12) which is defined by a first wide wall (21), a second wide wall (22), a first narrow wall (23), a second narrow wall (24), and a short wall (25) and which is filled with a dielectric; and a mode conversion section (31) which includes a columnar conductor (34) extending from a surface of the waveguide region (12) toward an inside of the waveguide region (12). A width (W2) of the short wall (25) is configured to be greater than a waveguide width (W1) at a location (x=x1) at which the columnar conductor (34) is provided.
    Type: Application
    Filed: October 26, 2018
    Publication date: June 24, 2021
    Applicant: FUJIKURA LTD.
    Inventor: Yusuke Uemichi
  • Publication number: 20210195741
    Abstract: 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: Application
    Filed: June 12, 2019
    Publication date: June 24, 2021
    Applicant: Fujikura Ltd.
    Inventors: Masakazu Sato, Nobuki Ueta, Yoshio Nakao, Masatoshi Inaba