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    MULTI-CORE AMPLIFIED OPTICAL FIBER AND MULTI-CORE OPTICAL FIBER AMPLIFIER
    1.
    发明公开
    MULTI-CORE AMPLIFIED OPTICAL FIBER AND MULTI-CORE OPTICAL FIBER AMPLIFIER 审中-公开
    MEHRADRIGEVERSTÄRKTEGLASFASER UNDVERSTÄRKEREINER MEHRADRIGEN GLASFASER

    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。

    OPTICAL FIBER
    2.
    发明公开
    OPTICAL FIBER 审中-公开
    光纤

    公开(公告)号：EP2613184A1

    公开(公告)日：2013-07-10

    申请号：EP11821445.1

    申请日：2011-07-20

    申请人： Furukawa Electric Co., Ltd.

    发明人： TSUCHIDA, Yukihiro ,  MUKASA, Kazunori

    IPC分类号： G02B6/036 ,  G02B6/032

    CPC分类号： G02B6/02019 ,  G02B6/02366 ,  G02B6/0365 ,  G02B6/03672

    摘要： An optical fiber includes a center core portion; an inner core layer formed around an outer circumference of the center core portion, a refractive index of which is less than that of the center core portion; an outer core layer formed around an outer circumference of the inner core layer, a refractive index of which is less than that of the inner core layer; and a cladding portion formed around an outer circumference of the outer core layer. A refractive index of the cladding portion is substantially equal to that of the inner core layer. At a wavelength of 1550 nm, an effective core area is equal to or larger than 130 µm 2 , and a bending loss is equal to or less than 100 dB/m when the optical fiber is bent with a diameter of 20 mm. A cable cut-off wavelength is equal to or less than 1530 nm. With this configuration, the optical fiber transmits light at a communication waveband in a single mode, suppresses an increase in the bending loss, and has a large effective core area.

    摘要翻译： 光纤包括中心芯部分; 内芯层，所述内芯层形成在所述中心芯部的外周上，所述内芯层的折射率小于所述中心芯部的折射率; 外芯层，所述外芯层围绕所述内芯层的外周形成，所述外芯层的折射率小于所述内芯层的折射率; 以及围绕外芯层的外周形成的包层部分。 包层部分的折射率基本上等于内芯层的折射率。 在1550nm的波长处，有效纤芯面积等于或大于130μm2，并且当光纤以20mm的直径弯曲时，弯曲损耗等于或小于100dB / m。 电缆截止波长等于或小于1530nm。 通过该结构，光纤以单一模式在通信波段中传输光，抑制弯曲损耗的增加，并且具有大的有效芯体面积。

    OPTICAL FIBER, OPTICAL FIBER RIBBON, AND OPTICAL FIBER CABLE
    3.
    发明公开
    OPTICAL FIBER, OPTICAL FIBER RIBBON, AND OPTICAL FIBER CABLE 审中-公开

    公开(公告)号：EP4283352A1

    公开(公告)日：2023-11-29

    申请号：EP22742618.6

    申请日：2022-01-19

    申请人： Furukawa Electric Co., Ltd.

    发明人： MUKASA, Kazunori ,  KASAHARA, Minoru ,  AISO, Keiichi ,  TSUCHIDA, Yukihiro ,  YOMOGITA, Naoya ,  SUGANE, Takumi ,  SUGANUMA, Ichihiko ,  GONOHE, Tomoaki ,  IWAYA, Mitsuhiro ,  VARALLYAY, Zoltan ,  MIHALFFY, Tamas

    IPC分类号： G02B6/036 ,  G02B6/44

    摘要： An optical fiber includes a core portion, a side core layer, a cladding portion, a primary layer, and a secondary layer. Regarding a relative refractive-index difference Δ1 of the core portion, a relative refractive-index difference Δ2 of the side core layer, and a relative refractive-index difference ΔClad of the cladding portion; the relationship Δ1>ΔClad>Δ2 holds true as well as the relationship 0>Δ2 holds true. That is, when the relative refractive-index difference Δ1 is equal to or greater than 0.23% and equal to or smaller than 0.30%, when the relative refractive-index difference Δ2 is equal to or greater than -0.23% and equal to or smaller than -0.08%, when the difference (Δ1-Δ2) is equal to or greater than 0.36% and equal to or smaller than 0.53%, when a core diameter 2a represents the core diameter of the core portion, and when an outer diameter 2b represents the outer diameter of the side core layer; the ratio b/a is equal to or greater than 2 and equal to or smaller than 5; the core diameter 2a is equal to or greater than 11.5 µm and equal to or smaller than 14.5 µm; the effective core area at the wavelength of 1550 nm is equal to or greater than 100 µm 2 and equal to or smaller than 160 µm 2 ; the primary layer thickness as well as the secondary layer thickness is equal to 5 µm; the primary elastic modulus is smaller than the secondary elastic modulus; and the microbending loss at the wavelength of 1550 is equal to or smaller than 1.0 dB/km.

    MULTICORE AMPLIFYING OPTICAL FIBER
    8.
    发明公开
    MULTICORE AMPLIFYING OPTICAL FIBER 审中-公开
    Optische Faser mitMehrkernverstärkung

    公开(公告)号：EP2722943A1

    公开(公告)日：2014-04-23

    申请号：EP12799722.9

    申请日：2012-05-31

    申请人： Furukawa Electric Co., Ltd.

    发明人： TSUCHIDA, Yukihiro ,  MIMURA, Yu

    IPC分类号： H01S3/067 ,  G02B6/032 ,  G02B6/036 ,  G02B6/04

    CPC分类号： G02B6/02042 ,  G02B6/0285 ,  G02B6/032 ,  G02B6/03622 ,  H01S3/06725 ,  H01S3/06729 ,  H01S3/06733 ,  H01S3/06737 ,  H01S3/06741 ,  H01S3/06754

    摘要： A multi-core amplification optical fiber includes: a plurality of core portions doped with a rare-earth element; an inner cladding portion positioned at a periphery of the plurality of core portions, having a refractive index lower than a refractive index of the plurality of core portions, in which a first hole is formed; and an outer cladding layer positioned at a periphery of the inner cladding portion, having a refractive index lower than the refractive index of the inner cladding portion. Preferably, the first hole is disposed in a region surrounded by the plurality of core portions in a cross-section of the multi-core amplification optical fiber. Thereby, fluctuation of the optical amplification characteristics of the respective core portions is suppressed.

    摘要翻译： 多核放大光纤包括：掺杂有稀土元素的多个芯部; 位于所述多个芯部的周围的内包层部，折射率低于形成有第一孔的所述多个芯部的折射率; 以及外包层，其位于所述内包层部的周围，折射率低于所述内包层部的折射率。 优选地，第一孔设置在多芯放大光纤的横截面中被多个芯部包围的区域中。 由此，能够抑制各芯部的光放大特性的波动。

    HOLEY FIBER
    9.
    发明公开
    HOLEY FIBER 审中-公开
    LÖCHRIGEFASER

    公开(公告)号：EP2549306A1

    公开(公告)日：2013-01-23

    申请号：EP11756330.4

    申请日：2011-03-16

    申请人： Furukawa Electric Co., Ltd.

    发明人： TSUCHIDA, Yukihiro ,  MUKASA, Kazunori

    IPC分类号： G02B6/00 ,  G02B6/032

    CPC分类号： G02B6/02347 ,  G02B6/02228

    摘要： A holey fiber includes a core portion located at a center thereof and a cladding portion located around the core portion and having holes formed in layers around the core portion; the holes are arranged so as to form a triangular lattice; when a diameter of the holes is d in micrometers and a lattice constant of the triangular lattice is Λ in micrometers, d/Λ is within a range of 0.43 ± 0.10 and A is 10.5 micrometers to 15 micrometers; at a wavelength of 1550 nanometers, an effective core-area is equal to or greater than 130 µm 2 and a bending loss upon bending at a diameter of 20 millimeters is equal to or less than 200 dB/m; and the holey fiber demonstrates a single-mode operation.

    摘要翻译： 多孔纤维包括位于其中心的芯部和位于芯部周围的具有形成在芯部周围的层的孔的包层部分; 孔被布置成形成三角形格子; 当孔的直径为d并且三角形格子的晶格常数为>微米时，d />在0.43±0.10和A为10.5微米至15微米的范围内; 在1550纳米的波长下，有效芯面积等于或大于130μm2，并且在直径为20毫米的弯曲时的弯曲损耗等于或小于200dB / m; 多孔光纤显示单模操作。