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    OPTICAL FIBER
    1.
    发明公开
    OPTICAL FIBER 审中-公开

    公开(公告)号：EP3591450A1

    公开(公告)日：2020-01-08

    申请号：EP18761969.7

    申请日：2018-01-19

    申请人： Sumitomo Electric Industries, Ltd.

    发明人： TAMURA, Yoshiaki ,  SOHMA, Kazuyuki ,  HASEGAWA Takemi

    IPC分类号： G02B6/44 ,  G02B6/02 ,  G02B6/036

    摘要： An optical fiber according to an embodiment comprises, as a structure suitable for large capacity transmission over a long haul, a core, a cladding having an outer diameter of 80 µm or more and 130 µm or less, a primary coating, and a secondary coating having elasticity higher than that of the primary coating and an outer diameter of 210 µm or less. The optical fiber having the structure as described above has an MFD of 10 µm or more at a wavelength of 1550 nm, a cable cutoff wavelength longer than 1260 nm, and a microbending loss of 0.6 dB/km or less at a wavelength of 1550 nm.

    OPTICAL FIBER, COLORED OPTICAL FIBER, AND OPTICAL TRANSMISSION SYSTEM
    2.
    发明公开
    OPTICAL FIBER, COLORED OPTICAL FIBER, AND OPTICAL TRANSMISSION SYSTEM 审中-公开

    公开(公告)号：EP3537192A1

    公开(公告)日：2019-09-11

    申请号：EP19160500.5

    申请日：2019-03-04

    申请人： Sumitomo Electric Industries, Ltd.

    发明人： KAWAGUSHI, Yuki ,  TAMURA, Yoshiaki ,  SAKUMA, Hirotaka

    IPC分类号： G02B6/02 ,  G02B6/036

    摘要： An optical fiber having an effective area that can be easily increased and bending loss characteristics that can be easily improved is provided. The optical fiber includes a glass fiber including a core and a cladding; a first resin coating layer that is in contact with the glass fiber and surrounds the glass fiber; and a second resin coating layer that surrounds the first resin coating layer and has a Young's modulus greater than a Young's modulus of the first resin coating layer. An effective area is greater than or equal to 110 µm 2 and less than or equal to 180 µm 2 at a wavelength of 1550 nm. A cable cut-off wavelength is less than or equal to 1530 nm. A uniformity of thickness of the first resin coating layer is greater than or equal to 60% and less than or equal to 80%.

    OPTICAL AMPLIFIER AND MULTI-CORE OPTICAL FIBER
    3.
    发明公开
    OPTICAL AMPLIFIER AND MULTI-CORE OPTICAL FIBER 审中-公开

    公开(公告)号：EP3525300A1

    公开(公告)日：2019-08-14

    申请号：EP17848805.2

    申请日：2017-09-06

    申请人： Sumitomo Electric Industries, Ltd.

    发明人： HASEGAWA, Takemi ,  HAYASHI, Tetsuya ,  TAMURA, Yoshiaki ,  SAKUMA, Hirotaka ,  NAGANO, Shigehiro

    IPC分类号： H01S3/10 ,  G02B6/02 ,  H01S3/067

    摘要： The present embodiment relates to an optical amplifier and the like having a structure for enabling efficient use of pumping light while avoiding complication of a device structure. In such an optical amplifier, since pumping light from a pumping light source is supplied to each core of an amplification MCF, a coupling MCF in which adjacent cores form a coupled core is arranged between the amplification MCF and the pumping light source. The pumping light source is optically connected to a specific core of the coupling MCF, and pumping light is coupled from the specific core to remaining cores except the specific core in the coupling MCF before pumping light is supplied to each core of the amplification MCF. This enables coupling of pumping light between optically connected cores between the amplification MCF and the coupling MCF.

    OPTICAL FIBER
    4.
    发明公开
    OPTICAL FIBER 审中-公开
    光纤

    公开(公告)号：EP3009868A1

    公开(公告)日：2016-04-20

    申请号：EP14811519.9

    申请日：2014-06-06

    申请人： Sumitomo Electric Industries, Ltd.

    发明人： HARUNA, Tetsuya ,  HIRANO, Masaaki ,  TAMURA, Yoshiaki ,  HIKICHI, Nobuhiro

    IPC分类号： G02B6/036

    CPC分类号： G02B6/03644 ,  G02B6/0283 ,  G02B6/0286

    摘要： Provided is an optical fiber that has a depressed cladding structure including a core, which is made of silica based glass containing Cl, and a first cladding and a second cladding, which are made of silica based glass containing fluorine, and that can perform single-mode propagation at a signal light wavelength. The optical fiber includes the core, the first cladding, and the second cladding. The core is made of silica based glass containing Cl. The first cladding and the second cladding are made of silica based glass containing fluorine. The refractive index of the first cladding is lower than the refractive index of the core. The refractive index of the second cladding is lower than the refractive index of the core and higher than the refractive index of the first cladding. The second cladding is divided into an outer region that has a uniform refractive index and an inner region that has a refractive index higher than the refractive index of the outer region. The difference ΔP between the maximum refractive index of the inner region and the refractive index of the outer region is 0.02% or greater and 0.10% or smaller in terms of relative refractive index with respect to pure silica glass. The radial thickness R of the inner region is 10 µm or greater and 25 µm or smaller.

    摘要翻译： 本发明提供一种具有凹陷包层结构的光纤，该包层结构包括由含有Cl的二氧化硅系玻璃构成的纤芯，以及由含氟的二氧化硅系玻璃构成的第一包层和第二包层， 在信号光波长下进行模式传播。 光纤包括纤芯，第一包层和第二包层。 核心由含有Cl的二氧化硅基玻璃制成。 第一包层和第二包层由含氟的二氧化硅基玻璃制成。 第一包层的折射率低于芯的折射率。 第二包层的折射率低于纤芯的折射率并且高于第一包层的折射率。 第二包层被分成具有均匀折射率的外部区域和具有比外部区域的折射率高的折射率的内部区域。 内部区域的最大折射率与外部区域的折射率之差ΔP相对于纯石英玻璃的折射率以折射率计为0.02％以上且0.10％以下。 内部区域的径向厚度R为10μm以上且25μm以下。

    OPTICAL FIBER
    7.
    发明公开
    OPTICAL FIBER 审中-公开
    光纤

    公开(公告)号：EP2894498A1

    公开(公告)日：2015-07-15

    申请号：EP13835235.6

    申请日：2013-09-02

    申请人： Sumitomo Electric Industries, Ltd.

    发明人： HIRANO, Masaaki ,  HARUNA, Tetsuya ,  TAMURA, Yoshiaki ,  YAMAMOTO, Yoshinori

    IPC分类号： G02B6/02 ,  G02B6/036

    CPC分类号： G02B6/02014 ,  G02B6/02019 ,  G02B6/02266 ,  G02B6/03611 ,  G02B6/03627 ,  G02B6/0365

    摘要： Provided is an optical fiber that is suitable for high-density packing and long-haul transmission. An optical fiber according to the present invention includes a core and a cladding. At a wavelength of 1550 nm, an effective area Aeff is 100 µm 2 or less and a chromatic dispersion Disp is 19.0 ps/nm/km or more and 22 ps/nm/km or less, and, when an effective length is denoted by Leff and an attenuation is denoted by α, a figure of merit FOM represented by an expression "FOM = 5 log{|Disp|·Leff} - 10 log{Leff/Aeff}-100α" is 3.2 dB or more.

    摘要翻译： 提供适用于高密度包装和长途传输的光纤。 根据本发明的光纤包括芯和包层。 在1550nm的波长下，有效面积Aeff为100μm2以下，色散Disp为19.0ps / nm / km以上且22ps / nm / km以下，有效长度为Leff 并且衰减由α表示时，由表达式“FOM = 5log {| Disp |·Leff} - 10log {Leff / Aeff}-100α”表示的品质因数FOM为3.2dB或更多。

    OPTICAL FIBER
    10.
    发明公开
    OPTICAL FIBER 审中-公开

    公开(公告)号：EP3955034A1

    公开(公告)日：2022-02-16

    申请号：EP20787375.3

    申请日：2020-04-06

    申请人： SUMITOMO ELECTRIC INDUSTRIES, LTD.

    发明人： TAMURA, Yoshiaki ,  KAWAGUCHI, Yuki ,  SAKUMA, Hirotaka ,  SUZUKI, Masato

    IPC分类号： G02B6/036

    摘要： An optical fiber has a structure uniform in a longitudinal direction. This optical fiber includes: a core that includes a silica glass containing an alkali metal element; and a cladding that includes a silica glass and surrounds the core in a cross-section perpendicular to the longitudinal direction. A refractive index of the cladding is lower than a refractive index of the core. The cladding has, in the cross-section, an inner cladding layer having a circular ring shape and including an inner circumferential surface of the cladding, and an outer cladding layer having a circular ring shape and including an outer circumferential surface of the cladding. The inner cladding layer contains fluorine. The inner and outer cladding layers have refractive indexes different from each other. The outer cladding layer includes a local maximum portion where a residual stress, which is a tensile stress, becomes local maximum. A radial distance between the local maximum portion and an inner circumferential surface of the outer cladding layer is 10 µm or less.