公开(公告)号：US20200041313A1

公开(公告)日：2020-02-06

申请号：US16485096

申请日：2017-12-08

Applicant: FUJIKURA LTD.

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

IPC: G01D5/353 ,  G02B6/02

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：US20200012041A1

公开(公告)日：2020-01-09

申请号：US16495870

申请日：2018-03-22

Applicant: FUJIKURA LTD.

Inventor： Kentaro Ichii ,  Keisuke Hirakawa ,  Kazuyuki Hayashi

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

Abstract: A polarization maintaining fiber includes: a core; an inner cladding enclosing the core; two stress applying parts that sandwich the inner cladding therebetween; and an outer cladding enclosing the inner cladding and the two stress applying parts. Each of the two stress applying parts is depressed inward against the inner cladding, and the core has a flattened cross section having a long-axis that corresponds to a direction in which the two stress applying parts are aligned.

公开(公告)号：US10073220B2

公开(公告)日：2018-09-11

申请号：US15451010

申请日：2017-03-06

Applicant: FUJIKURA LTD.

Inventor： Tomoyuki Fujita ,  Kentaro Ichii ,  Ken Katagiri ,  Kenichi Ohmori ,  Rintaro Kitahara ,  Tatsuya Kishi

IPC: G02B6/26 ,  G02B6/28 ,  G02B27/09 ,  G02B6/255 ,  G02B6/036

CPC classification number: G02B6/26 ,  G02B6/02 ,  G02B6/02042 ,  G02B6/028 ,  G02B6/036 ,  G02B6/03605 ,  G02B6/03611 ,  G02B6/2552 ,  G02B6/262 ,  G02B6/28 ,  G02B6/2804 ,  G02B6/287 ,  G02B27/0994 ,  H01S3/067 ,  H01S3/06745

Abstract: Provided is an optical coupler configured to cause an NA of light, which exits a taper fiber, to be smaller as compared with a conventional optical coupler. A taper fiber has a high refractive index part which is provided inside a core of the taper fiber and which has a refractive index smaller than a refractive index ncore of the core. An exit end surface of each GI fiber is bonded to an entrance end surface of the taper fiber so that at least a part of the exit end surface of the each GI fiber overlaps with a section of the high refractive index part. A relative refractive index difference of the taper fiber is smaller than 0.076%.

公开(公告)号：US20170235055A1

公开(公告)日：2017-08-17

申请号：US15451010

申请日：2017-03-06

Applicant: FUJIKURA LTD.

Inventor： Tomoyuki Fujita ,  Kentaro Ichii ,  Ken Katagiri ,  Kenichi Ohmori ,  Rintaro Kitahara ,  Tatsuya Kishi

IPC: G02B6/28 ,  G02B27/09 ,  G02B6/26

CPC classification number: G02B6/26 ,  G02B6/02 ,  G02B6/02042 ,  G02B6/028 ,  G02B6/036 ,  G02B6/03605 ,  G02B6/03611 ,  G02B6/2552 ,  G02B6/262 ,  G02B6/28 ,  G02B6/2804 ,  G02B6/287 ,  G02B27/0994 ,  H01S3/067 ,  H01S3/06745

Abstract: Provided is an optical coupler configured to cause an NA of light, which exits a taper fiber, to be smaller as compared with a conventional optical coupler. A taper fiber has a high refractive index part which is provided inside a core of the taper fiber and which has a refractive index smaller than a refractive index ncore of the core. An exit end surface of each GI fiber is bonded to an entrance end surface of the taper fiber so that at least a part of the exit end surface of the each GI fiber overlaps with a section of the high refractive index part. A relative refractive index difference of the taper fiber is smaller than 0.076%.

公开(公告)号：US09698557B2

公开(公告)日：2017-07-04

申请号：US15062681

申请日：2016-03-07

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

Inventor： Tsukasa Hosokawa ,  Kentaro Ichii ,  Katsuhiro Takenaga ,  Shoichiro Matsuo ,  Hirotaka Ono ,  Makoto Yamada

IPC: H01S3/067 ,  G02B6/036 ,  H01S3/094 ,  H01S3/16 ,  H01S3/08 ,  H01S3/0941

CPC classification number: H01S3/06729 ,  G02B6/03611 ,  H01S3/06766 ,  H01S3/0804 ,  H01S3/094003 ,  H01S3/094069 ,  H01S3/09415 ,  H01S3/1608

Abstract: An optical fiber for amplification includes a core having an inner core and an outer core surrounding the outer circumferential surface of the inner core. The relative refractive index difference of the inner core to a cladding is smaller than the relative refractive index difference of the outer core to the cladding. The outer core is entirely doped with erbium. The theoretical cutoff wavelength of an LP11 mode light beam is a wavelength of 1,565 nm or more. The theoretical cutoff wavelength of an LP21 mode light beam is a wavelength of 1,530 nm or less. The theoretical cutoff wavelength of the LP02 mode light beam is a wavelength of 980 nm or less.

公开(公告)号：US09673589B2

公开(公告)日：2017-06-06

申请号：US15236937

申请日：2016-08-15

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

Inventor： Tsukasa Hosokawa ,  Kentaro Ichii ,  Katsuhiro Takenaga ,  Shoichiro Matsuo ,  Hirotaka Ono ,  Makoto Yamada

IPC: H01S3/067 ,  H01S3/094 ,  G02B6/12 ,  H01S3/16

CPC classification number: H01S3/06725 ,  G02B2006/1209 ,  H01S3/0672 ,  H01S3/06729 ,  H01S3/06733 ,  H01S3/06766 ,  H01S3/0804 ,  H01S3/094003 ,  H01S3/094069 ,  H01S3/1603 ,  H01S3/1608

Abstract: An amplification optical fiber operable to propagate light beams in a plurality of modes in a predetermined wavelength range through a core doped with a rare earth element, wherein Expression (1) is satisfied, where a cutoff wavelength of a propagated highest mode light beam is defined as λmax, under conditions in which the cutoff wavelength of the highest mode light beam is defined as λc, a shortest wavelength of the wavelength range is defined as λmin, and a cutoff wavelength of a second-highest mode light beam to the highest mode light beam is λmin. λc>0.5 λmin+0.5 λmax  (1).

公开(公告)号：US20170054266A1

公开(公告)日：2017-02-23

申请号：US15236937

申请日：2016-08-15

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

Inventor： Tsukasa Hosokawa ,  Kentaro Ichii ,  Katsuhiro Takenaga ,  Shoichiro Matsuo ,  Hirotaka Ono ,  Makoto Yamada

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

CPC classification number: H01S3/06725 ,  G02B2006/1209 ,  H01S3/0672 ,  H01S3/06729 ,  H01S3/06733 ,  H01S3/06766 ,  H01S3/0804 ,  H01S3/094003 ,  H01S3/094069 ,  H01S3/1603 ,  H01S3/1608

Abstract: An amplification optical fiber operable to propagate light beams in a plurality of modes in a predetermined wavelength range through a core doped with a rare earth element, wherein Expression (1) is satisfied, where a cutoff wavelength of a propagated highest mode light beam is defined as λmax, under conditions in which the cutoff wavelength of the highest mode light beam is defined as λc, a shortest wavelength of the wavelength range is defined as λmin, and a cutoff wavelength of a second-highest mode light beam to the highest mode light beam is λmin. λc>0.5 λmin+0.5 λmax  (1)

公开(公告)号：US20160268757A1

公开(公告)日：2016-09-15

申请号：US15062681

申请日：2016-03-07

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

Inventor： Tsukasa Hosokawa ,  Kentaro Ichii ,  Katsuhiro Takenaga ,  Shoichiro Matsuo ,  Hirotaka Ono ,  Makoto Yamada

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

CPC classification number: H01S3/06729 ,  G02B6/03611 ,  H01S3/06766 ,  H01S3/0804 ,  H01S3/094003 ,  H01S3/094069 ,  H01S3/09415 ,  H01S3/1608

Abstract: An optical fiber for amplification includes a core having an inner core and an outer core surrounding the outer circumferential surface of the inner core. The relative refractive index difference of the inner core to a cladding is smaller than the relative refractive index difference of the outer core to the cladding. The outer core is entirely doped with erbium. The theoretical cutoff wavelength of an LP11 mode light beam is a wavelength of 1,565 nm or more. The theoretical cutoff wavelength of an LP21 mode light beam is a wavelength of 1,530 nm or less. The theoretical cutoff wavelength of the LP02 mode light beam is a wavelength of 980 nm or less.

Abstract translation: 用于放大的光纤包括具有内芯和围绕内芯的外圆周表面的外芯的芯。 内芯与包层的相对折射率差小于外芯与包层的相对折射率差。 外芯完全掺铒。 LP11模式光束的理论截止波长为1,565nm以上的波长。 LP21模式光束的理论截止波长为1530nm以下的波长。 LP02模式光束的理论截止波长为980nm以下的波长。

公开(公告)号：US20130081430A1

公开(公告)日：2013-04-04

申请号：US13629697

申请日：2012-09-28

Applicant: FUJIKURA LTD.

Inventor： Nobuo Oozeki ,  Kentaro Ichii ,  Tomofumi Arai

IPC: C03B37/018

CPC classification number: C03B37/01861

Abstract: Provided is a method of manufacturing an optical fiber base material using a MCVD method, including: a step of heating a glass tube while rotating the glass tube and supplying a gas into a through-hole of the glass tube, wherein in at least a part of the step, the inside of the through-hole is pressurized so that an outer diameter of the glass tube increases.

Abstract translation: 提供一种使用MCVD方法制造光纤基材的方法，包括：在旋转玻璃管并将气体供应到玻璃管的通孔中的同时加热玻璃管的步骤，其中在至少一部分 为了使玻璃管的外径增大，对通孔的内部进行加压。