公开(公告)号：US12001050B2

公开(公告)日：2024-06-04

申请号：US17448077

申请日：2021-09-20

Applicant: FURUKAWA ELECTRIC CO., LTD.

Inventor： Masanori Takahashi ,  Koichi Maeda ,  Shinichi Arai ,  Ryuichi Sugizaki ,  Masayoshi Tsukamoto

IPC: G02B6/02

CPC classification number: G02B6/02042

Abstract: A multicore fiber includes: n pieces of first core regions in a circular shape with a radius r1 that are arranged about points P11 to P1n, and that has a first core portion and a first cladding portion; a second core region in a circular shape with a radius R1 that is arranged about the point a1, and that has a second core portion and a second cladding portion; and a cladding region that is formed on an outer circumferences of the first core region and the second core region. Further, abutting surfaces that are flat surfaces abutting on each other are formed in portions on the outer circumferences of the first core region and the second core region.

公开(公告)号：US11753328B2

公开(公告)日：2023-09-12

申请号：US16894982

申请日：2020-06-08

Applicant: FURUKAWA ELECTRIC CO., LTD.

Inventor： Shinichi Arai ,  Shigeto Matsumoto

IPC: C03B37/12 ,  C03C25/105 ,  G02B6/02

CPC classification number: C03B37/12 ,  C03C25/105 ,  G02B6/02395

Abstract: A method for screening an optical fiber core including a resin coating layer, includes: a pre-strain applying step of adding a tensile force while feeding a portion of the optical fiber core retained at both ends of the portion, and applying a pre-tensile strain larger than zero and smaller than a guaranteed tensile strain set as a guaranteed value; a guaranteed strain applying step of adding a tensile force while feeding the portion of the optical fiber core retained at both ends of the portion and applied with the pre-tensile strain, and applying the guaranteed tensile strain only for a predetermined time; and a guaranteed strain releasing step of releasing the optical fiber core from the guaranteed tensile strain.

公开(公告)号：US11237322B2

公开(公告)日：2022-02-01

申请号：US16571974

申请日：2019-09-16

Applicant: FURUKAWA ELECTRIC CO., LTD. ,  NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Shinichi Arai ,  Harumi Inaba ,  Shigeto Matsumoto ,  Takeshi Yagi ,  Shinichi Aozasa ,  Kyozo Tsujikawa ,  Kazuhide Nakajima

IPC: G02B6/02 ,  G02B6/036

Abstract: An optical fiber manufacturing method includes setting a first holding member and a rod inside a glass pipe, the first holding member made of glass and having plural holes formed, so that the rod is supported by the first holding member; filling glass particles between the rod and a glass pipe inner wall; holding the rod such that the rod and the filled glass particles are enclosed by the glass pipe inner wall and the first and second holding members, and sealing one end of the glass pipe and manufacturing an intermediate; and manufacturing an optical fiber from the intermediate, wherein a bulk density of the first and second holding members is set with reference to a bulk density of a filling portion made from the glass particles, and the predetermined range is determined according to a core diameter permissible variation range in its longitudinal direction.

公开(公告)号：US12078562B2

公开(公告)日：2024-09-03

申请号：US17446876

申请日：2021-09-03

Applicant: FURUKAWA ELECTRIC CO., LTD.

Inventor： Hideaki Hasegawa ,  Hiroyuki Tamaoka ,  Takeshi Yagi ,  Shinichi Arai

IPC: G01L11/02 ,  G02B6/02 ,  G02B6/255

CPC classification number: G01L11/025 ,  G02B6/0229 ,  G02B6/2551

Abstract: A pressure sensor includes: a light source that outputs signal light; a sensor optical fiber where the signal light is input and the signal light is propagated with a loss of 0.3 dB/m or more; and an optical receiver that receives the signal light propagated through the sensor optical fiber. Further, pressure applied to the sensor optical fiber is detected on a basis of intensity of the signal light received by the optical receiver.