公开(公告)号：EP3726196A1

公开(公告)日：2020-10-21

申请号：EP18887703.9

申请日：2018-12-14

申请人： FURUKAWA ELECTRIC CO., LTD.

发明人： ARAI, Shinichi ,  MATSUMOTO, Shigeto

IPC分类号： G01N3/00 ,  C03B37/12 ,  G01M11/00 ,  G01N3/08 ,  G02B6/02

摘要： To provide a method and device for screening an optical fiber core, and a method for manufacturing an optical fiber core that can suppress occurrence of damage in resin coating layers of optical fiber, a screening method applies a guaranteed tensile strain set as a guaranteed value to the optical fiber core with a resin coating layer. The method 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 smaller than the guaranteed tensile strain, 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 just for a predetermined time, and a strain releasing step of releasing the optical fiber core from the guaranteed tensile strain.

公开(公告)号：EP2765661A1

公开(公告)日：2014-08-13

申请号：EP12837909.6

申请日：2012-10-04

申请人： Furukawa Electric Co., Ltd.

发明人： TSUCHIDA, Yukihiro ,  MAEDA, Koichi ,  MIMURA, Yu ,  MATSUURA, Hiroshi ,  WATANABE, Kengo ,  SAITO, Tsunetoshi ,  MIYABE, Ryo ,  MATSUMOTO, Shigeto ,  AISO, Keiichi ,  SUGIZAKI, Ryuichi

IPC分类号： H01S3/067 ,  G02B6/04 ,  H01S3/10

CPC分类号： H01S3/06708 ,  G02B6/02042 ,  H01S3/0064 ,  H01S3/06737 ,  H01S3/06754 ,  H01S3/094061 ,  H01S3/09415 ,  H01S3/1608 ,  H01S3/2383 ,  H01S2301/02 ,  H01S2301/04 ,  H04J14/02 ,  H04J14/04

摘要： A multi-core amplification optical fiber includes a plurality of core portions doped with a rare-earth element, and a cladding portion positioned at an outer periphery of each of the core portions and having refractive index lower than refractive index of each of the core portions, in which when a concentration of the rare-earth element doped to each of the core portions is 250 ppm to 2000 ppm, a relative refractive index Δ of each of the core portions relative to the cladding portion is 0.5% to 2% at a wavelength of 1550 nm, and a core diameter of each of the core portions is 1 µm to 5 µm, a separation distance between each of the core portions and adjacent one of the core portions is set at equal to or larger than 30 µm and at equal to or smaller than 60 µm so that a crosstalk of light between the adjacent core portions is equal to or lower than -30 dB. Hereby a multi-core amplification optical fiber and a multi-core optical fiber amplifier capable of optical amplification while suppressing lowering of the qualtity in signal light are provided.

摘要翻译： 多芯放大光纤包括掺杂有稀土元素的多个芯部和位于每个芯部的外周的折射率低于每个芯部的折射率的包层部分 其中，当掺杂到每个芯部分的稀土元素的浓度为250ppm至2000ppm时，每个芯部分相对于包层部分的相对折射率“a”为0.5％至2％ 波长为1550nm，芯部的芯直径为1μm〜5μm，芯部与相邻的芯部之间的间隔距离设定为30μm以上， 等于或小于60μm，使得相邻芯部之间的光的串扰等于或低于-30dB。 因此，提供了能够在抑制信号光的准确性降低的同时进行光放大的多核放大光纤和多芯光纤放大器。

公开(公告)号：EP3604243A1

公开(公告)日：2020-02-05

申请号：EP18771583.4

申请日：2018-03-08

申请人： Furukawa Electric Co., Ltd. ,  Nippon Telegraph and Telephone Corporation

发明人： ARAI, Shinichi ,  INABA, Harumi ,  MATSUMOTO, Shigeto ,  YAGI, Takeshi ,  AOZASA, Shinichi ,  TSUJIKAWA, Kyozo ,  NAKAJIMA, Kazuhide

IPC分类号： C03B37/012 ,  C03B37/014 ,  C03B37/027 ,  G02B6/02

摘要： An optical fiber manufacturing method includes placing, inside a glass pipe constituting a cladding portion, a first holding member, which is one of a pair of holding members made of glass and having a plurality of holes formed thereon, and a core rod, which includes a core forming portion serving as the core portion and includes a cladding forming portion constituting the cladding portion, in such a way that the core rod is supported by the first holding member; includes filling glass particles in the gap between the inner wall face of the glass pipe and the core rod; includes placing a second holding member of the pair of holding members inside the glass pipe and holding the core rod in a sandwiched manner in between the first holding member and the second holding member; includes sealing one end portion of the glass pipe and manufacturing an intermediate object; and includes manufacturing an optical fiber using the intermediate object. The bulk density of the first holding member and the second holding member is set to be within a predetermined range with reference to the bulk density of the filling portion filled with the glass particles, and the predetermined range is determined according to the permissible variation range for the core diameter in the longitudinal direction of the optical fiber.

公开(公告)号：EP2765661B1

公开(公告)日：2018-12-05

申请号：EP12837909.6

申请日：2012-10-04

申请人： Furukawa Electric Co., Ltd.

发明人： TSUCHIDA, Yukihiro ,  MAEDA, Koichi ,  MIMURA, Yu ,  MATSUURA, Hiroshi ,  WATANABE, Kengo ,  SAITO, Tsunetoshi ,  MIYABE, Ryo ,  MATSUMOTO, Shigeto ,  AISO, Keiichi ,  SUGIZAKI, Ryuichi

IPC分类号： H01S3/067 ,  G02B6/04 ,  H01S3/10 ,  H01S3/094 ,  G02B6/02 ,  H01S3/0941 ,  H01S3/16 ,  H01S3/23 ,  H01S3/00 ,  H04J14/02 ,  H04J14/04

CPC分类号： H01S3/06708 ,  G02B6/02042 ,  H01S3/0064 ,  H01S3/06737 ,  H01S3/06754 ,  H01S3/094061 ,  H01S3/09415 ,  H01S3/1608 ,  H01S3/2383 ,  H01S2301/02 ,  H01S2301/04 ,  H04J14/02 ,  H04J14/04

摘要： A multi-core amplification optical fiber includes a plurality of core portions doped with a rare-earth element, and a cladding portion positioned at an outer periphery of each of the core portions and having refractive index lower than refractive index of each of the core portions, in which when a concentration of the rare-earth element doped to each of the core portions is 250 ppm to 2000 ppm, a relative refractive index ” of each of the core portions relative to the cladding portion is 0.5% to 2% at a wavelength of 1550 nm, and a core diameter of each of the core portions is 1 µm to 5 µm, a separation distance between each of the core portions and adjacent one of the core portions is set at equal to or larger than 30 µm and at equal to or smaller than 60 µm so that a crosstalk of light between the adjacent core portions is equal to or lower than -30 dB. Hereby a multi-core amplification optical fiber and a multi-core optical fiber amplifier capable of optical amplification while suppressing lowering of the qualtity in signal light are provided.