公开(公告)号：US20230350144A1

公开(公告)日：2023-11-02

申请号：US18331602

申请日：2023-06-08

Applicant: Fujikura Ltd.

Inventor： Shogo Shimizu ,  Akira Namazue ,  Ken Osato

IPC: G02B6/44

CPC classification number: G02B6/4432 ,  G02B6/4403 ,  G02B6/4405 ,  G02B6/4404 ,  G02B6/441

Abstract: An optical fiber cable includes: a sheath; and a core that is housed in the sheath and includes optical fibers. Recesses and protrusions are disposed alternately in a circumferential direction on an outer circumferential surface of the sheath. The optical fiber cable has a compressive strength of 12.8 N/mm2 or greater and 32.4 N/mm2 or less.

公开(公告)号：US11768344B2

公开(公告)日：2023-09-26

申请号：US17764779

申请日：2020-07-06

Applicant: FUJIKURA LTD.

Inventor： Go Taki ,  Akira Namazue ,  Ken Osato

IPC: G02B6/48 ,  G02B6/04 ,  G02B6/44

CPC classification number: G02B6/483 ,  G02B6/48 ,  G02B6/04 ,  G02B6/4471

Abstract: An optical cable wiring method, includes: installing a bundle of optical cables from a utility pole as a starting point of a first wiring path to a branch point on the first wiring path; dividing, at the branch point, the bundle of optical cables into a first group and a second group; installing one of the optical cables in the first group along the first wiring path ahead of the branch point; and installing one of the optical cables in the second group along a second wiring path branching from the first wiring path.

公开(公告)号：US20230228958A1

公开(公告)日：2023-07-20

申请号：US18185989

申请日：2023-03-17

Applicant: Fujikura Ltd.

Inventor： Ryo Kuramitsu ,  Koji Tomikawa ,  Ken Osato

IPC: G02B6/44

CPC classification number: G02B6/4404 ,  G02B6/448 ,  G02B6/443 ,  G02B6/4482

Abstract: A machining method for an optical fiber unit, includes: preparing an optical fiber unit in which a first optical fiber ribbon that intermittently connects a first plurality of optical fibers and a second optical fiber ribbon that intermittently connects a second plurality of optical fibers are layered and arranged, the first optical fiber ribbon and the second optical fiber ribbon are intermittently connected in a length direction by interlayer connection parts; opening up a separation part between the first optical fiber ribbon and the second optical fiber ribbon; and breaking the interlayer connection parts by inserting a finger or a division tool into the opened separation part.

公开(公告)号：US11592634B2

公开(公告)日：2023-02-28

申请号：US17260792

申请日：2019-09-03

Applicant: Fujikura Ltd.

Inventor： Shinnosuke Sato ,  Mizuki Isaji ,  Koji Tomikawa ,  Ken Osato

IPC: G02B6/44

Abstract: An optical fiber cable includes: optical fiber units each having optical fibers; a wrapping tube that wraps around the optical fiber units; a filling disposed inside the wrapping tube; and a sheath that covers the wrapping tube. The optical fiber units includes outer units that are disposed at an outermost layer of the optical fiber units. The outer units are twisted in an SZ shape around a cable central axis of the optical fiber cable. The filling is sandwiched between one of the outer units and the wrapping tube in a cross-sectional view.

公开(公告)号：US20220342172A1

公开(公告)日：2022-10-27

申请号：US17763950

申请日：2020-11-09

Applicant: Fujikura Ltd.

Inventor： Masatoshi Ohno ,  Okimi Mukai ,  Go Taki ,  Shogo Shimizu ,  Ryo Inagaki ,  Akira Namazue ,  Ken Osato

IPC: G02B6/44 ,  G02B6/25

Abstract: A method of exposing a core of an optical fiber cable that includes: a core including an optical fiber; a wrapping tube wrapping the core; a jacket housing the core and the wrapping tube; and a tension-resisting member of a Fiber Reinforced Plastic (FRP) embedded in the jacket, includes: making a cut in a circumferential direction in the jacket at a position closer to a first end portion of the optical fiber cable than to a second end portion of the optical fiber cable in a longitudinal direction; bending the optical fiber cable at a portion having the cut and fracturing the tension-resisting member; and removing a removal portion of the jacket that is disposed between the cut and the first end portion.

公开(公告)号：US20220317399A1

公开(公告)日：2022-10-06

申请号：US17632681

申请日：2020-05-12

Applicant: FUJIKURA LTD.

Inventor： Yoshie Murakoshi ,  Akira Namazue ,  Ken Osato

IPC: G02B6/44

Abstract: [Problem] When a surface of the optical fiber ribbon is rough, the microbending loss is increased due to the irregularities formed on the surface of the optical fiber ribbon.
[Solution] An intermittently connected optical fiber ribbon of the present disclosure, includes: a plurality of optical fibers arranged in a predetermined direction; and connecting portions that intermittently connect two adjacent ones of the optical fibers. A peripheral cover portion formed of resin configuring the connecting portions is formed on a periphery of the optical fibers. An arithmetic mean roughness Ra of a surface of the peripheral cover portion is 0.41 μm or lower.

公开(公告)号：US11262515B2

公开(公告)日：2022-03-01

申请号：US16340626

申请日：2017-11-17

Applicant: FUJIKURA LTD.

Inventor： Masatoshi Ohno ,  Shinnosuke Sato ,  Mizuki Isaji ,  Kouji Tomikawa ,  Akira Namazue ,  Ken Osato

IPC: G02B6/44

Abstract: An optical fiber cable includes a core that includes an assembled plurality of optical fibers; an inner sheath that accommodates the core therein, a pair of tension members that are embedded in the inner sheath and that are disposed on opposite sides of the core, and an outer sheath that covers the inner sheath. The inner sheath is formed with a dividing portion that divides an inner peripheral surface and an outer peripheral surface of the inner sheath in a circumferential direction. The dividing portion extends along a longitudinal direction in which the optical fiber cable extends.

公开(公告)号：US11231556B2

公开(公告)日：2022-01-25

申请号：US16688387

申请日：2019-11-19

Applicant: AFL Telecommunications LLC ,  FUJIKURA LTD.

Inventor： Joseph Cignarale ,  Doug Baker ,  Yoshio Hashimoto ,  Ken Osato

IPC: G02B6/44

Abstract: An optical fiber cable including an optical fiber ribbon in a pipe, wherein the ribbon includes at least two optical fibers arranged side by side, and wherein at least two of the optical fibers are bonded intermittently along a length of the fibers.

公开(公告)号：US10884208B2

公开(公告)日：2021-01-05

申请号：US16481768

申请日：2018-02-06

Applicant: FUJIKURA LTD.

Inventor： Tomoaki Kaji ,  Kouji Tomikawa ,  Ken Osato

IPC: G02B6/44

Abstract: An optical fiber cable includes: a core; a sheath that accommodates the core therein; and a pair of tension members embedded in the sheath. The core includes: a plurality of optical fiber units that each includes a plurality of optical fibers; fibrous fillings that extend in a longitudinal direction in which the plurality of optical fiber units extends; and a wrapping tube that encloses the plurality of optical fiber units and the fibrous fillings. The core is interposed between the pair of tension members.

公开(公告)号：US20200209505A1

公开(公告)日：2020-07-02

申请号：US16645996

申请日：2018-12-11

Applicant: Fujikura Ltd. ,  NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Masatoshi Ohno ,  Kouji Tomikawa ,  Ken Osato ,  Hiroaki Tanioka ,  Shigekatsu Tetsutani ,  Yohei Endo ,  Yuta Maruo

IPC: G02B6/44

Abstract: An optical fiber cable includes: a cable body having a core and an inner sheath that accommodates the core; a reinforcing sheet that surrounds the cable body; an outer sheath that accommodates the cable body and the reinforcing sheet; and an outer ripcord that is embedded in the inner sheath. The inner sheath includes a projection that projects outwardly in a radial direction of the optical fiber cable. At least part of the outer ripcord is disposed inside the projection.