Nippon Telegraph and Telephone Corporation

Junichi Kawataka

Yusuke Yamada

Hisashi Izumita

Kazunori Katayama

Masashi Kikuchi

Atsushi Nakamura

Hiroyuki Oshida

Daisuke Iida

Chihiro Kito

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 fiberin which a plurality of optical fibers having Brillouin frequency shift characteristics different from each other are arranged in parallel; an optical measuring instrumentthat launches an optical pulse into at least two of the optical fibers of the sensing fiberto 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; and an arithmetic processing unitthat acquires a physical quantity of the sensing fiberat said any position based on the beat frequency acquired by the optical measuring instrument

Brillouin optical sensing device and optical sensing method

An optical fiber cableincludes at least one optical fiber coreand a sheath containing the optical fiber core. The optical fiber coreincludes optical fibers. A total length of the optical fiber coreis longer than that of the sheath. The optical fiber coreis contained in the sheathso that bending occurs in the optical fibers

Optical fiber cable

An intermittent tape core wire () 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 (), a difference &#x3b8; between a core wire twisting direction Dof the k core wire at a bonding portion () connecting the k core wire and the l core wire and a core wire twisting direction Dof the k core wire at a bonding portion () connecting the k core wire and the m core wire is different from when manufactured.

Optical fiber cable, and device and method for manufacturing optical fiber cable

Growing community of inventors

Tsukuba, Japan

Junichi Kawataka