Fujikura Limited

Nippon Telegraph and Telephone Corporation

Afl Telecommunications Lcc

Ken Osato

Akira Namazue

Mizuki Isaji

Naoki Okada

Tomoaki Kaji

Kouji Tomikawa

Yusuke Yamada

Masayoshi Yamanaka

Soichiro Kaneko

Masatoshi Ohno

Joseph Cignarale

Yoshio Hashimoto

Go Taki

Doug Baker

Shogo Shimizu

Masayuki Ishioka

Shinya Hamaguchi

Takashi Matsuzawa

Hisaaki Nakane

Koji Tomikawa

Shinnosuke Sato

Daisuke Kakuta

Yukiko Take

Daiki Takeda

Yoshie Sajima

Shigekatsu Tetsutani

Naoto Ito

Naoki Nakagawa

Hiroaki Tanioka

Yuta Maruo

Okimi Mukai

Yoshie Murakoshi

Keiji Ohashi

Kazunaga Kobayashi

Satoru Shiobara

Shimei Tanaka

Yuji Aoyagi

Akira Sakurai

Akira Murata

Yohei Endo

Osamu Koyasu

Shengyang Luo

Ryo Kuramitsu

Yukihiko Shibata

Takeshi Honjo

Shizuka Sekine

Masashi Hara

Noriaki Yamashita

Shizuka Moriya

Takafumi Sato

Ryo Inagaki

Hironori Sato

Shota Yagi

Yuki Nemoto

Masanobu Higuchi

Tatsushi Ogasawara

Masataka Mikami

An optical fiber cable includes: a sheath including recesses and protrusions that are alternately disposed in a circumferential direction on an outer circumferential surface of the sheath; a core that includes optical fibers and is accommodated in the sheath; tensile strength members embedded in the sheath; and a ripcord that is embedded in the sheath. A marking portion protruding outward in a radial direction is disposed in the sheath. The ripcord is disposed between the marking portion and the core.

Optical fiber cable

A cable that protects an object includes a sheath and a cylindrical reinforcement member disposed inside the sheath and that surrounds the object. The cylindrical reinforcement member has a first side edge and a second side edge that extend in a longitudinal direction. The cylindrical reinforcement member is formed of a cable reinforcement sheet including a first metal sheet and a second metal sheet joined to the first metal sheet. A portion of the first metal sheet overlaps a portion of the second metal sheet, and the overlapping portions define a joint portion where the first metal sheet and the second metal sheet are joined. The joint portion is inclined, from the second side edge to the first side edge, toward the first metal sheet.

Cable and cable reinforcement sheet

An optical fiber cable includes: a core including optical fibers; a reinforcing wrap that surrounds the core; and a sheath that accommodates the core and the reinforcing wrap. The reinforcing wrap includes an overlapping portion. A first end portion of the reinforcing wrap overlaps a second end portion of the reinforcing wrap at a portion of the reinforcing wrap in a circumferential direction of the optical fiber cable in a cross-sectional view.

Optical fiber cable production method, and optical fiber cable

An optical cable includes optical fiber units each of which includes intermittently-coupled optical fiber ribbons. In at least one of the optical fiber units, in a cross section perpendicular to a longitudinal direction of the at least one of the optical fiber units, a length of a vector GU is shorter than a largest length of vectors MG of the intermittently-coupled optical fiber ribbons forming the at least one of the optical fiber units, where, in each of the intermittently-coupled optical fiber ribbons, each of the vectors MG is a vector starting from M and ending at G, M is a midpoint between optical fibers at both ends of the each of the intermittently-coupled optical fiber ribbons, and G is a center of gravity of the each of the intermittently-coupled optical fiber ribbons, and the vector GU is a resultant vector of the vectors MG.

Optical cable and optical-cable manufacturing method

A housing unit includes: a linear material; and a housing body that houses the linear material. In the housing body, winding regions in which the linear material is wound are disposed in a circumferential direction. The linear material is wound in a figure eight in a first region pair constituted by a pair of the winding regions. The linear material is wound in a figure eight in a second region pair constituted by a pair of the winding regions that are different from the winding regions constituting the first region pair.

Housing unit and wound body

An optical fiber ribbon includes: optical fibers disposed side by side in a predetermined direction; and connecting portions that connect two adjacent ones of the optical fibers. A peripheral resin portion is formed on a periphery of the optical fibers. An arithmetic mean roughness Ra of a surface of the peripheral resin portion is 0.41 μm or lower. A ten-point mean roughness Rz of a surface of the peripheral resin portion is 1.4 μm or lower.

Intermittently connected optical fiber ribbon

An optical fiber unit according to the present disclosure includes a plurality of intermittently-connected optical fiber ribbons. At least one of the optical fiber ribbons includes a plurality of optical fibers including a first optical fiber, and a second optical fiber that is longer than the first optical fiber. Conditions (AA) and c<0.05 are satisfied, where b is an interval, in a length direction, between connection parts that connect the first optical fiber and the second optical fiber, c (%) is a fiber length difference of the second optical fiber with respect to the first optical fiber, and Y is an interval between the optical fibers in a ribbon width direction.

Optical fiber unit and optical fiber unit manufacturing method

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.

Round and small diameter optical cables with a ribbon-like optical fiber structure

An optical fiber cable includes: a sheath; a core that is housed in the sheath and comprises optical fibers; tensile strength members embedded in the sheath; and ripcords embedded in the sheath. 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. In a transverse cross-sectional view, the ripcords are positioned inside some of the protrusions, and the tensile strength members are positioned inside the remaining protrusions.

A bundling suspension wire includes: a suspension wire that includes a supporting wire and a coat coating the supporting wire; a hanger member that is suspended from the suspension wire and into which a cable is configured to be inserted; and wire threading cords that are inserted into the hanger member.

Bundling suspension wire

An optical fiber cable includes: a cable body that includes an optical fiber; an external sheath that accommodates the cable body; a protective layer that is disposed between the cable body and the external sheath and that includes a first groove on an inner circumferential surface of the protective layer, wherein the first groove extends along an axial direction of the cable body; and a first ripcord disposed in the first groove and between the cable body and the protective layer.

An optical fiber arrangement method includes: preparing an intermittently connected optical fiber ribbon including optical fibers arranged side by side at a first pitch larger than a fiber diameter; holding a non-connecting region of the optical fiber ribbon with a holder, where connecting portions intermittently connect the optical fibers extending out from the holder to each other; changing a width of the optical fiber ribbon in an interior of the holder; and arranging the optical fibers, extending out from the holder, with intervals of the optical fibers changed from the first pitch to a second pitch smaller than the first pitch by removing the connecting portions in a state where the holder is holding the optical fibers.

Optical fiber arrangement method, optical fiber fusion splicing method, method for manufacturing optical fiber ribbon with connector, and intermittently connected optical fiber ribbon

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.

Optical cable and optical cable manufacturing method

An optical fiber protective unit includes: a reticulated tube; and a tubular member that is inserted through the reticulated tube and that is configured to accommodate a plurality of optical fibers. The reticulated tube is disposed on an outer periphery of the tubular member in a state folded in a longitudinal direction. Both end parts of the reticulated tube are located on the outer periphery of the tubular member.

Reticulated tube, optical fiber protective unit, method for protecting optical fiber, and method for manufacturing reticulated tube

A cable that protects an object includes: a sheath; and a cylindrical reinforcement member disposed inside the sheath and that surrounds the object. The cylindrical reinforcement member has a first side edge and a second side edge that extend in a longitudinal direction. The cylindrical reinforcement member is formed of a cable reinforcement sheet including: a first metal sheet; and a second metal sheet joined to the first metal sheet. A portion of the first metal sheet overlaps a portion of the second metal sheet, and the overlapping portions define a joint portion where the first metal sheet and the second metal sheet are joined. The joint portion is inclined, from the second side edge to the first side edge, toward the first metal sheet.

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Sakura, Japan

Ken Osato