公开(公告)号：US20240288647A1

公开(公告)日：2024-08-29

申请号：US18570957

申请日：2021-06-18

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Akira SAKURAI ,  Hiroaki TANIOKA ,  Shigekatsu TETSUTANI ,  Yusuke YAMADA ,  Masashi KIKUCHI

IPC: G02B6/44

CPC classification number: G02B6/4431

Abstract: In order to achieve the above-mentioned object, an optical fiber cable according to the present disclosure includes an optical fiber core wire, a sheath covering the optical fiber core wire, three or more anti-tension members inside the sheath, arranged along a longitudinal axis of the optical fiber core wire, and a tear string having an outer periphery a part of which is located outside an outer circumscribed lines of outer peripheries of the three or more anti-tension members in certain cross-sections perpendicular to a longitudinal direction of the sheath, and a part of which comes in contact with an inner periphery of the sheath or is located inside the inner periphery of the sheath in a cross-section perpendicular to the longitudinal direction of the sheath.

公开(公告)号：US20240302620A1

公开(公告)日：2024-09-12

申请号：US18289247

申请日：2021-05-31

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Masashi KIKUCHI ,  Shigekatsu TETSUTANI ,  Yusuke YAMADA ,  Akira SAKURAI ,  Hiroaki TANIOKA

IPC: G02B6/44

CPC classification number: G02B6/4482

Abstract: An optical fiber cable according to the present disclosure includes a cable core having one or a plurality of optical fiber core wires therein; an outer cover which covers the cable core and has a concave portion or a plurality of convex portions for an outer edge of a cross section perpendicular to a long axis direction of the outer cover; and an impression which is marked on the concave portion or on a portion sandwiched between the plurality of convex portions of a side surface of the outer cover.

公开(公告)号：US20230333340A1

公开(公告)日：2023-10-19

申请号：US18026845

申请日：2020-10-09

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Yuta MARUO ,  Akira SAKURAI ,  Yusuke YAMADA ,  Shigekatsu TETSUTANI ,  Hiroaki TANIOKA

IPC: G02B6/38 ,  G02B6/44

CPC classification number: G02B6/441 ,  G02B6/38875

Abstract: An optical cable according to the present disclosure has a structure in which at least one or more optical fiber cores and an interposition that prevents optical fibers from coming into contact with each other are bundled by a bundle tape.

公开(公告)号：US20240272394A1

公开(公告)日：2024-08-15

申请号：US18289763

申请日：2021-05-31

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Masashi KIKUCHI ,  Shigekatsu TETSUTANI ,  Yusuke YAMADA ,  Akira SAKURAI ,  Hiroaki TANIOKA

IPC: G02B6/44

CPC classification number: G02B6/443 ,  G02B6/4486

Abstract: An optical fiber cable according to the present disclosure includes: a cable core having a plurality of optical fiber core wires; a sheath covering the cable core; and at least two or more tension members, having warping ability outward from an axial center of a cable core, disposed inside the sheath along the cable core, and any one of the tension members is disposed at a position laying along a position of another of the tension members with the axial center of the cable core sandwiched between the positions.

公开(公告)号：US20240248001A1

公开(公告)日：2024-07-25

申请号：US18289233

申请日：2021-05-31

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Yusuke YAMADA ,  Masashi KIKUCHI ,  Akira SAKURAI ,  Shigekatsu TETSUTANI ,  Hiroaki TANIOKA

IPC: G01M11/00

CPC classification number: G01M11/3109

Abstract: An object of the present invention is to provide an optical fiber testing method and an optical fiber winding device capable of appropriately reproducing the same lateral pressure and minute bending state in a test of an optical fiber as those in an optical cable.
In the optical fiber testing method according to the present invention, an optical fiber 51-2 of the second layer wound around a bobbin 12 is used as an object to be tested. Lateral pressure to the optical fiber 51-2 of the second layer is applied by an optical fiber 51-3 of the third layer. The lateral pressure is adjusted by a tension when the optical fiber 51-3 of the third layer is wound around the bobbin. In other words, since the lateral pressure is applied to the optical fiber to be tested from another optical fiber, the same lateral pressure and minute bending state as those in the optical cable can be reproduced.

公开(公告)号：US20230314743A1

公开(公告)日：2023-10-05

申请号：US18009774

申请日：2020-06-16

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Yuta MARUO ,  Hiroaki TANIOKA ,  Shigekatsu TETSUTANI ,  Yusuke YAMADA ,  Akira SAKURAI

IPC: G02B6/44

CPC classification number: G02B6/443

Abstract: The object of the present disclosure is to provide an optical fiber cable having a large contact area with the bottom surface of a rectangular groove and easily bent in at least two directions, as compared to an optical fiber cable having a circular cross-sectional shape perpendicular to a long axis direction. Therefore, the optical fiber cable of the present disclosure has three or more flat side surfaces in the long axis direction and two or more axes each having a minimum moment of inertia of area with respect to neutral planes.

公开(公告)号：US20230314744A1

公开(公告)日：2023-10-05

申请号：US18016890

申请日：2020-07-22

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Yuta MARUO ,  Hiroaki TANIOKA ,  Shigekatsu TETSUTANI ,  Yusuke YAMADA ,  Akira SAKURAI

IPC: G02B6/44

CPC classification number: G02B6/443

Abstract: An optical fiber cable of the present disclosure is formed by assembling a plurality of drop optical cables, and each of the drop optical cables has a structure where at least one or more optical fiber cores and a tension fiber or a tension member is embedded in a sheath such that the drop optical cable has two or more axes each having a minimum value of a second moment of area with respect to arbitrary neutral planes, and even an optical cable obtained by assembling drop optical cables has a structure having two or more axes each having a minimum value of the second moment of area with respect to arbitrary neutral planes.

公开(公告)号：US20230213724A1

公开(公告)日：2023-07-06

申请号：US17928140

申请日：2020-06-01

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Akira SAKURAI ,  Hiroaki TANIOKA ,  Hisashi IZUMITA ,  Shigekatsu TETSUTANI ,  Yusuke YAMADA ,  Yuta MARUO

IPC: G02B6/44

CPC classification number: G02B6/4451

Abstract: An object is to provide a closure with a structure having a drainage function to eliminate water immersion into a coated optical fiber against temporary flooding and to prevent water from continuously contacting the coated optical fiber. Another object is to provide a closure with improved workability for opening and closing.
A closure according to the present invention protects a connection part that connects a coated optical fiber enclosed in a optical fiber cable with a coated optical fiber enclosed in a optical fiber cable. The closure includes a coated optical fiber housing that divides an interior of the closure into a first space that is on a side of a road and has a main body cable insertion hole for inserting the optical fiber cables from an exterior and a second space that is on an opposite side of the road and includes the connection part. The coated optical fiber housing has a frustum shape with two bases each open and a base with a smaller area of the two bases protruding toward the side of the road. The base with the smaller area of the two bases is a cable insertion hole for inserting the optical fiber cable from the first space into the second space and is not in contact with a bottom surface of the first space on the side of the road.

公开(公告)号：US20230204896A1

公开(公告)日：2023-06-29

申请号：US17926672

申请日：2020-06-03

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Yuta MARUO ,  Hiroaki TANIOKA ,  Hisashi IZUMITA ,  Shigekatsu TETSUTANI ,  Yusuke YAMADA ,  Akira SAKURAI

IPC: G02B6/46 ,  G02B6/44

CPC classification number: G02B6/46 ,  G02B6/4439

Abstract: An object of the present disclosure is to provide a method of laying an optical cable that is capable of laying and removing the optical cable in a stable place without civil engineering works. To achieve the above-mentioned object, a method of laying an optical cable according to the present disclosure includes laying the optical cable and two laying strips on a road surface or a wall surface so that the optical cable is sandwiched between side surfaces of the two laying strips.

公开(公告)号：US20230073123A1

公开(公告)日：2023-03-09

申请号：US17798125

申请日：2020-03-02

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Yusuke YAMADA ,  Akira SAKURAI ,  Yuta MARUO ,  Shigekatsu TETSUTANI ,  Hisashi IZUMITA ,  Hiroaki TANIOKA

IPC: G02B6/50

Abstract: A method of laying an optical cable according to the present disclosure includes: installing a laying strip, in which the optical cable is to be embedded, on a road surface or a wall surface; forming a cut line, for embedding the optical cable, on the installed laying strip; and embedding the optical cable in the formed cut line.