公开(公告)号：US10883860B2

公开(公告)日：2021-01-05

申请号：US16485096

申请日：2017-12-08

Applicant: FUJIKURA LTD.

Inventor： Kenichi Ohmori ,  Koji Omichi ,  Shingo Matsushita ,  Kentaro Ichii

IPC: G01B11/16 ,  G02B6/02 ,  G01D5/353

Abstract: An optical fiber sensor includes: a central core disposed at a center of an optical fiber; and an outer peripheral core that spirally surrounds the central core. The effective refractive index ne2 of the outer peripheral core is lower than the effective refractive index ne1 of the central core. A ratio between the effective refractive index ne2 and the effective refractive index ne1 matches a ratio between an optical path length of the central core and an optical path length of the outer peripheral core.

公开(公告)号：US20190204512A1

公开(公告)日：2019-07-04

申请号：US16329145

申请日：2017-05-30

Applicant: FUJIKURA LTD.

Inventor： Keisuke Hirakawa ,  Kentaro Ichii ,  Kazuyuki Hayashi

IPC: G02B6/30 ,  G02B6/036 ,  G02B6/255 ,  G02B6/024

Abstract: An optical fiber includes: a core that includes quartz glass doped with a core updopant; an inner cladding that includes quartz glass doped with a cladding updopant and a downdopant and that covers a circumferential surface of the core; and an outer cladding that includes quartz glass and that covers an outer circumferential surface of the inner cladding. A refractive index of the inner cladding is substantially equal to a refractive index of the outer cladding. The inner cladding contains the cladding updopant at a concentration such that a refractive index increase rate ascribed to the cladding updopant falls within a range of 0.25% to 0.5%.

公开(公告)号：US20150318659A1

公开(公告)日：2015-11-05

申请号：US14440984

申请日：2013-10-31

Applicant: FUJIKURA LTD. ,  NIPPON TELEGRAPH AND TELEPHONE CORPORATION ,  OSAKA PREFECTURE UNIVERSITY PUBLIC CORPORATION ,  National University Corporation Shimane University

Inventor： Shoichiro Matsuo ,  Katsuhiro Takenaga ,  Kentaro Ichii ,  Hirotaka Ono ,  Kyouzou Tsujikawa ,  Makoto Yamada ,  Hiroji Masuda

IPC: H01S3/067 ,  G02B6/02 ,  G02B6/036

CPC classification number: H01S3/06737 ,  G02B6/02042 ,  G02B6/036 ,  G02B6/03633 ,  G02B6/04 ,  H01S3/06733 ,  H01S3/06754 ,  H01S3/094007 ,  H01S3/2383

Abstract: A plurality of cores 51 is disposed around the center axis of a first cladding 52 in a state in which an inter-core distance Λ of cores adjacent to each other is equal, a refractive index n1 of the core 51 is provided higher than a refractive index n2 of the first cladding 52, and the refractive index n2 of the first cladding 52 is provided higher than a refractive index n3 of a second cladding 53. Moreover, 5.8≦Λ/MFD(2λc/(λc+λop))≦8 is satisfied, where the inter-core distance is defined as Λ, a mode field diameter of the core is defined as MFD, a cutoff wavelength is defined as λc, and a wavelength of communication light incident on the core 51 is defined as λop.

Abstract translation: 在彼此相邻的芯的芯间距离Λ相等的状态下，多个芯51围绕第一包层52的中心轴设置，芯51的折射率n1被设置为高于折射率 第一包层52的折射率n2和第一包层52的折射率n2被设置为高于第二包层53的折射率n3。此外，5.8＆nlE;Λ/ MFD（2λc/（λc+λop））＆nlE 8，其中芯间距离被定义为Λ，芯的模场直径被定义为MFD，截止波长被定义为λc，并且入射在芯51上的通信光的波长被定义为 λop。

公开(公告)号：US10246366B2

公开(公告)日：2019-04-02

申请号：US13628444

申请日：2012-09-27

Applicant: FUJIKURA LTD.

Inventor： Nobuo Oozeki ,  Kentaro Ichii ,  Tomofumi Arai

IPC: C03B23/06 ,  C03C15/00 ,  C03B37/018

Abstract: Provided is a method of manufacturing an optical fiber base material by an inside mounting method, including: a step of rotating and heating a glass tube fixed at two positions and supplying a gas into a through-hole of the glass tube, wherein in the step, the glass tube is warped so that an axis between respective fixed portions of the glass tube has a shape in which a catenary curve is reversed in the vertical direction.

公开(公告)号：US09515450B2

公开(公告)日：2016-12-06

申请号：US14440984

申请日：2013-10-31

Applicant: FUJIKURA LTD. ,  NIPPON TELEGRAPH AND TELEPHONE CORPORATION ,  OSAKA PREFECTURE UNIVERSITY PUBLIC CORPORATION ,  NATIONAL UNIVERSITY CORPORATION SHIMANE UNIVERSITY

Inventor： Shoichiro Matsuo ,  Katsuhiro Takenaga ,  Kentaro Ichii ,  Hirotaka Ono ,  Kyouzou Tsujikawa ,  Makoto Yamada ,  Hiroji Masuda

IPC: H01S3/067 ,  G02B6/02 ,  G02B6/036 ,  H01S3/094 ,  G02B6/04 ,  H01S3/23

CPC classification number: H01S3/06737 ,  G02B6/02042 ,  G02B6/036 ,  G02B6/03633 ,  G02B6/04 ,  H01S3/06733 ,  H01S3/06754 ,  H01S3/094007 ,  H01S3/2383

Abstract: A plurality of cores 51 is disposed around the center axis of a first cladding 52 in a state in which an inter-core distance Λ of cores adjacent to each other is equal, a refractive index n1 of the core 51 is provided higher than a refractive index n2 of the first cladding 52, and the refractive index n2 of the first cladding 52 is provided higher than a refractive index n3 of a second cladding 53. Moreover, 5.8≦Λ/MFD(2λc/(λc+λop))≦8 is satisfied, where the inter-core distance is defined as Λ, a mode field diameter of the core is defined as MFD, a cutoff wavelength is defined as λc, and a wavelength of communication light incident on the core 51 is defined as λop.

Abstract translation: 在彼此相邻的芯的芯间距离Λ相等的状态下，多个芯51围绕第一包层52的中心轴设置，芯51的折射率n1被设置为高于折射率 第一包层52的折射率n2和第一包层52的折射率n2被设置为高于第二包层53的折射率n3。此外，5.8≤Λ/ MFD（2λc/（λc+λop））≤8 其中芯间距离被定义为Λ，芯的模场直径被定义为MFD，截止波长被定义为λc，并且入射在芯51上的通信光的波长被定义为λop。

公开(公告)号：US20150318661A1

公开(公告)日：2015-11-05

申请号：US14441029

申请日：2013-10-31

Applicant: FUJIKURA LTD. ,  NIPPON TELEGRAPH AND TELEPHONE CORPORATION ,  OSAKA PREFECTURE UNIVERSITY PUBLIC CORPORATION ,  NATIONAL UNIVERSITY CORPORATION SHIMANE UNIVERSITY

Inventor： Shoichiro Matsuo ,  Katsuhiro Takenaga ,  Kentaro Ichii ,  Hirotaka Ono ,  Kyouzou Tsujikawa ,  Makoto Yamada ,  Hiroji Masuda

IPC: H01S3/067 ,  G02B6/036 ,  H01S3/091 ,  G02B6/02

CPC classification number: H01S3/06754 ,  G02B6/02042 ,  G02B6/03605 ,  G02B6/03611 ,  H01S3/06729 ,  H01S3/06733 ,  H01S3/06737 ,  H01S3/091 ,  H01S3/094007 ,  H01S3/2383

Abstract: The first cladding 52 has a two-layer structure formed of a solid inner layer 62A passed through the center axis of the first cladding 52 and an outer layer 62B enclosing the inner layer 62A and the plurality of cores 51 with no gap. A refractive index n1 of the core 51 is provided higher than refractive indexes n2A and n2B of the inner layer 62A and the outer layer 62B, the refractive indexes n2A and n2B of the inner layer 62A and the outer layer 62B are provided higher than a refractive index n3 of the second cladding 53, and the refractive index n2A of the inner layer 62A is provided lower than the refractive index n2B of the outer layer 62B.

Abstract translation: 第一包层52具有由穿过第一包层52的中心轴线的实心内层62A和不间隙地包围内层62A和多个芯51的外层62B形成的两层结构。 芯体51的折射率n1比内层62A和外层62B的折射率n2A，n2B高，内层62A和外层62B的折射率n2A，n2B高于屈光度 第二包层53的折射率n3和内层62A的折射率n2A被设定为低于外层62B的折射率n2B。

公开(公告)号：US20240258759A1

公开(公告)日：2024-08-01

申请号：US18019186

申请日：2021-11-30

Applicant: FUJIKURA LTD.

Inventor： Ryoichi Nishimura ,  Kentaro Ichii

IPC: H01S3/094 ,  H01S3/067 ,  H01S3/0941 ,  H01S3/16

CPC classification number: H01S3/094011 ,  H01S3/06716 ,  H01S3/09415 ,  H01S3/1618

Abstract: A fiber laser includes: a gain fiber having a core doped with Yb; and a forward pumping light source group that generates forward pumping light that is inputted into the gain fiber and belongs to a 976-nm band. An absorption amount of the forward pumping light in a section of the gain fiber, calculated according to ∫P(λ)A(λ)dλ, is greater than or equal to 253 W and less than or equal to 1100 W where P(λ) [W] is a power spectrum of the forward pumping light, and A(λ) [%/m] is an absorption rate spectrum of the doped Yb. A length of the section is 1 m and includes an end face of the gain fiber on which the forward pumping light is incident.

公开(公告)号：US09252556B2

公开(公告)日：2016-02-02

申请号：US14441029

申请日：2013-10-31

Applicant: FUJIKURA LTD. ,  NIPPON TELEGRAPH AND TELEPHONE CORPORATION ,  OSAKA PREFECTURE UNIVERSITY PUBLIC CORPORATION ,  National University Corporation Shimane University

Inventor： Shoichiro Matsuo ,  Katsuhiro Takenaga ,  Kentaro Ichii ,  Hirotaka Ono ,  Kyouzou Tsujikawa ,  Makoto Yamada ,  Hiroji Masuda

IPC: H01S3/00 ,  H01S3/067 ,  G02B6/02 ,  G02B6/036 ,  H01S3/091

CPC classification number: H01S3/06754 ,  G02B6/02042 ,  G02B6/03605 ,  G02B6/03611 ,  H01S3/06729 ,  H01S3/06733 ,  H01S3/06737 ,  H01S3/091 ,  H01S3/094007 ,  H01S3/2383

Abstract: The first cladding 52 has a two-layer structure formed of a solid inner layer 62A passed through the center axis of the first cladding 52 and an outer layer 62B enclosing the inner layer 62A and the plurality of cores 51 with no gap. A refractive index n1 of the core 51 is provided higher than refractive indexes n2A and n2B of the inner layer 62A and the outer layer 62B, the refractive indexes n2A and n2B of the inner layer 62A and the outer layer 62B are provided higher than a refractive index n3 of the second cladding 53, and the refractive index n2A of the inner layer 62A is provided lower than the refractive index n2B of the outer layer 62B.

Abstract translation: 第一包层52具有由穿过第一包层52的中心轴线的实心内层62A和不间隙地包围内层62A和多个芯51的外层62B形成的两层结构。 芯体51的折射率n1比内层62A和外层62B的折射率n2A，n2B高，内层62A和外层62B的折射率n2A，n2B高于屈光度 第二包层53的折射率n3和内层62A的折射率n2A被设定为低于外层62B的折射率n2B。

公开(公告)号：US20130081429A1

公开(公告)日：2013-04-04

申请号：US13628444

申请日：2012-09-27

Applicant: FUJIKURA LTD.

Inventor： Nobuo Oozeki ,  Kentaro Ichii ,  Tomofumi Arai

IPC: C03B37/014 ,  C03B37/025

CPC classification number: C03B37/01861 ,  C03B37/01869 ,  C03B2201/30 ,  C03B2201/31 ,  C03B2201/34 ,  C03B2203/23

Abstract: Provided is a method of manufacturing an optical fiber base material by an inside mounting method, including: a step of rotating and heating a glass tube fixed at two positions and supplying a gas into a through-hole of the glass tube, wherein in the step, the glass tube is warped so that an axis between respective fixed portions of the glass tube has a shape in which a catenary curve is reversed in the vertical direction.

Abstract translation: 提供一种通过内部安装方法制造光纤基材的方法，包括：将固定在两个位置的玻璃管旋转和加热并将气体供应到玻璃管的通孔中的步骤，其中在步骤 玻璃管弯曲，使得玻璃管的各固定部分之间的轴线具有垂直线在垂直方向上反转的形状。

公开(公告)号：US10670812B2

公开(公告)日：2020-06-02

申请号：US16329145

申请日：2017-05-30

Applicant: FUJIKURA LTD.

Inventor： Keisuke Hirakawa ,  Kentaro Ichii ,  Kazuyuki Hayashi

IPC: G02B6/30 ,  G02B6/024 ,  G02B6/036 ,  G02B6/255

Abstract: An optical fiber includes: a core that includes quartz glass doped with a core updopant; an inner cladding that includes quartz glass doped with a cladding updopant and a downdopant and that covers a circumferential surface of the core; and an outer cladding that includes quartz glass and that covers an outer circumferential surface of the inner cladding. A refractive index of the inner cladding is substantially equal to a refractive index of the outer cladding. The inner cladding contains the cladding updopant at a concentration such that a refractive index increase rate ascribed to the cladding updopant falls within a range of 0.25% to 0.5%.