公开(公告)号：US20220003921A1

公开(公告)日：2022-01-06

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

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：US20200012042A1

公开(公告)日：2020-01-09

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：US20240014622A1

公开(公告)日：2024-01-11

申请号：US18472597

申请日：2023-09-22

Applicant: FURUKAWA ELECTRIC CO., LTD.

Inventor： Shigehiro TAKASAKA ,  Yoshihiro EMORI ,  Shinichi ARAI ,  Ryuichi SUGIZAKI

IPC: H01S3/067 ,  H01S3/094

CPC classification number: H01S3/06737 ,  H01S3/094003

Abstract: A laser device includes: a seed light source configured to output a laser light having a single mode; a multicore fiber including at least one core group having at least one core, each of the core in the core group being optically coupled to neighboring cores; and an optical coupler configured to input the laser light to the core group, wherein in the multicore fiber, the laser light propagates through the core group in a super mode representing propagation mode of the core group.

公开(公告)号：US20230123319A1

公开(公告)日：2023-04-20

申请号：US18068039

申请日：2022-12-19

Applicant: FURUKAWA ELECTRIC CO., LTD.

Inventor： Shigehiro TAKASAKA ,  Koichi MAEDA ,  Keiichi AISO ,  Shinichi ARAI ,  Kazunori MUKASA ,  Yukihiro TSUCHIDA ,  Masanori TAKAHASHI ,  Ryuichi SUGIZAKI

IPC: H01S3/067 ,  H01S3/094

Abstract: An optical amplifying fiber includes: at least one core portion including a rare earth element added therein; an inner cladding portion surrounding the at least one core portion, the inner cladding portion having a refractive index lower than a maximum refractive index of the at least one core portion; and an outer cladding portion surrounding the inner cladding portion, the outer cladding portion having a refractive index lower than the refractive index of the inner cladding portion, the inner cladding portion including different refractive index regions each having a refractive index different from a refractive index of a region adjacent to that different refractive index region.

公开(公告)号：US20230006410A1

公开(公告)日：2023-01-05

申请号：US17931264

申请日：2022-09-12

Applicant: FURUKAWA ELECTRIC CO., LTD.

Inventor： Shigehiro TAKASAKA ,  Koichi MAEDA ,  Keiichi AISO ,  Shinichi ARAI ,  Ryuichi SUGIZAKI ,  Kazunori MUKASA ,  Yukihiro TSUCHIDA ,  Masanori TAKAHASHI

IPC: H01S3/067 ,  H01S3/16 ,  H01S3/091

Abstract: An optical amplifying fiber includes: at least one single core portion doped with a rare-earth element; an inner cladding portion configured to enclose the at least one core portion, the inner cladding portion having a lower refractive index than maximum refractive index of each core portion; and an outer cladding portion configured to enclose the inner cladding portion, the outer cladding portion having a lower refractive index than refractive index of the inner cladding portion, wherein the inner cladding portion includes a plurality of air bubbles.

公开(公告)号：US20210396617A1

公开(公告)日：2021-12-23

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 ,  G02B6/255 ,  G02B6/02

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.

公开(公告)号：US20200299178A1

公开(公告)日：2020-09-24

申请号：US16894982

申请日：2020-06-08

Applicant: FURUKAWA ELECTRIC CO., LTD.

Inventor： Shinichi ARAI ,  Shigeto MATSUMOTO

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

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：US20190177204A1

公开(公告)日：2019-06-13

申请号：US16089182

申请日：2017-03-28

Applicant: FURUKAWA ELECTRIC CO., LTD.

Inventor： Shinichi ARAI ,  Takeshi YAGI ,  Shigeto MATSUMOTO

IPC: C03B37/018

Abstract: A manufacturing method for an optical fiber preform includes forming a porous material made of fine silica glass particles surrounding a plurality of glass rods; and sintering the porous material, wherein the forming the porous material includes forming the porous material such that two or more of the plurality of glass rods protrude from the porous material, and the sintering includes supporting end portions of protruding sides of the two or more protruding glass rods collectively with a support jig, and performing the sintering. With this, a reduction in manufacturing yield is suppressed.