公开(公告)号：US20210132314A1

公开(公告)日：2021-05-06

申请号：US17256965

申请日：2019-07-02

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Masashi KIKUCHI ,  Yusuke YAMADA ,  Hisashi IZUMITA ,  Junichi KAWATAKA ,  Kazunori KATAYAMA

IPC: G02B6/44

Abstract: An intermittent tape core wire (140) of an optical fiber cable is assembled into a cable core so that in a k core wire, an l core wire, and an m core wire composed of a multi-core optical fibers continuously adjacent in the width direction of the intermittent tape core wire (140), a difference θ between a core wire twisting direction D2km of the k core wire at a bonding portion (142) connecting the k core wire and the l core wire and a core wire twisting direction D2kl of the k core wire at a bonding portion (142) connecting the k core wire and the m core wire is different from when manufactured.

公开(公告)号：US20230236044A1

公开(公告)日：2023-07-27

申请号：US17923263

申请日：2020-05-21

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Atsushi NAKAMURA ,  Chihiro KITO ,  Daisuke IIDA ,  Junichi KAWATAKA ,  Hiroyuki OSHIDA

IPC: G01D5/353

CPC classification number: G01D5/35364

Abstract: An object of the present invention is to provide a Brillouin optical sensing device and an optical sensing method capable of reducing introduction costs. The Brillouin optical sensing device according to the present invention includes: a sensing fiber 90 in which a plurality of optical fibers having Brillouin frequency shift characteristics different from each other are arranged in parallel; an optical measuring instrument 11 that launches an optical pulse into at least two of the optical fibers of the sensing fiber 90 to generate Brillouin scattering lights and measures a beat frequency of a beat signal between the Brillouin scattering lights at any position of the sensing fiber 90; and an arithmetic processing unit 12 that acquires a physical quantity of the sensing fiber 90 at said any position based on the beat frequency acquired by the optical measuring instrument 11.

公开(公告)号：US20210124113A1

公开(公告)日：2021-04-29

申请号：US17254501

申请日：2019-06-20

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Yusuke YAMADA ,  Masashi KIKUCHI ,  Hisashi IZUMITA ,  Junichi KAWATAKA ,  Kazunori KATAYAMA

IPC: G02B6/036 ,  G02B6/44

Abstract: An optical fiber cable 100 includes at least one optical fiber core 140 and a sheath containing the optical fiber core. The optical fiber core 140 includes optical fibers 130. A total length of the optical fiber core 140 is longer than that of the sheath 160. The optical fiber core 140 is contained in the sheath 160 so that bending occurs in the optical fibers 130.