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

    公开(公告)号：US20240280746A1

    公开(公告)日：2024-08-22

    申请号：US18650311

    申请日：2024-04-30

    Applicant: FURUKAWA ELECTRIC CO., LTD.

    Inventor： Shugo TAKEUCHI ,  Keiichi AISO ,  Kazunori MUKASA ,  Yoshihiro ARASHITANI

    IPC: G02B6/036

    CPC classification number: G02B6/03694 ,  G02B6/03627

    Abstract: An optical fiber includes: a core portion; and a cladding portion that has a refractive index lower than a maximum refractive index of the core portion and that surrounds an outer periphery of the core portion. The core portion includes a center core doped with germanium, and a low refractive index layer that surrounds an outer periphery of the center core, and in which −Δmax that is a minimum value of a relative refractive-index difference with respect to an average refractive index of the cladding portion is a negative value. A residual compressive stress in the center core is equal to or larger than 40 MPa and equal to or less than 150 MPa, and Δ1 that is an average maximum relative refractive-index difference of the center core with respect to the average refractive index of the cladding portion is equal to or less than 0.8%.

    METHOD OF PRODUCING OPTICAL FIBER PREFORM AND OPTICAL FIBER
    6.
    发明申请
    METHOD OF PRODUCING OPTICAL FIBER PREFORM AND OPTICAL FIBER 审中-公开

    公开(公告)号：US20200262736A1

    公开(公告)日：2020-08-20

    申请号：US16869076

    申请日：2020-05-07

    Applicant: FURUKAWA ELECTRIC CO., LTD.

    Inventor： Keiichi AISO ,  Tomohiro GONDA

    IPC: C03B37/014 ,  C03B37/012 ,  C03B37/025 ,  C03B37/018

    Abstract: A method of producing an optical fiber preform includes a silica glass body forming step of forming a silica glass body to be at least a portion of a core portion. The method includes an alkali-metal-doped silica glass body forming step of forming an alkali-metal-doped silica glass body doped with an alkali metal around the silica glass body such that the alkali-metal-doped silica glass body contacts the silica glass body. The method further includes a diffusing step of diffusing the alkali metal from the alkali-metal-doped silica glass body to the silica glass body by a heat treatment.

    METHOD OF PRODUCING GLASS PREFORM AND OPTICAL FIBER
    7.
    发明申请
    METHOD OF PRODUCING GLASS PREFORM AND OPTICAL FIBER 有权
    生产玻璃预制件和光纤的方法

    公开(公告)号：US20150329404A1

    公开(公告)日：2015-11-19

    申请号：US14810876

    申请日：2015-07-28

    Applicant: FURUKAWA ELECTRIC CO., LTD.

    Inventor： Ryo MIYABE ,  Keiichi AISO ,  Naomi KUMANO

    IPC: C03B37/018 ,  G02B6/02

    CPC classification number: C03B37/01853 ,  C03B37/0142 ,  C03B37/01446 ,  C03B37/01453 ,  C03B2201/12 ,  C03B2201/50 ,  C03B2203/22 ,  C03B2207/34 ,  C03B2207/50 ,  G02B6/02

    Abstract: A method of producing a glass preform including: forming a porous glass soot configured by an inner deposition soot deposited on a start material and an outer deposition soot deposited outside the inner deposition soot; and sintering, after the forming, the porous glass soot while doping with fluorine to form a glass body including an inner glass portion and an outer glass layer. An amount of the fluorine, with which the inner deposition soot is doped at the sintering, is equal to or more than 0 g/cm3 and less than an amount of the fluorine with which the outer deposition soot is doped.

    Abstract translation: 一种制造玻璃预制件的方法，包括：形成由沉积在起始材料上的内部沉积烟灰和沉积在内部沉积烟灰外部的外部沉积烟灰构成的多孔玻璃烟灰; 并且在形成之后，在掺杂氟的同时烧结多孔玻璃烟炱，以形成包括内玻璃部分和外玻璃层的玻璃体。 在烧结时掺杂有内部沉积炭黑的氟量等于或大于0g / cm 3，并且小于掺杂了外部沉积烟炱的氟的量。

    OPTICAL FIBER
    8.
    发明公开
    OPTICAL FIBER 审中-公开

    公开(公告)号：US20240150227A1

    公开(公告)日：2024-05-09

    申请号：US18538487

    申请日：2023-12-13

    Applicant: FURUKAWA ELECTRIC CO., LTD.

    Inventor： Kazunori MUKASA ,  Keiichi AISO

    IPC: C03C13/04 ,  G02B6/02 ,  G02B6/028

    CPC classification number: C03C13/046 ,  G02B6/02395 ,  G02B6/0283 ,  C03C2201/11 ,  C03C2201/50

    Abstract: An optical fiber includes a core portion made of silica-based glass; and a cladding portion made of silica-based glass having lower maximum refractive index than the core portion, the cladding portion surrounding an outer periphery of the core portion. The core portion is doped with an alkali metal element and chlorine. An average concentration of chlorine is higher than 800 atomic ppm on a cross-section perpendicular to a longitudinal direction of the core portion. A region doped with the alkali metal element is larger than a region doped with chlorine at 800 atomic ppm or higher.

    OPTICAL FIBER AND MANUFACTURING METHOD OF OPTICAL FIBER
    9.
    发明申请
    OPTICAL FIBER AND MANUFACTURING METHOD OF OPTICAL FIBER 审中-公开

    公开(公告)号：US20190391323A1

    公开(公告)日：2019-12-26

    申请号：US16561656

    申请日：2019-09-05

    Applicant: FURUKAWA ELECTRIC CO., LTD.

    Inventor： Ryo MIYABE ,  Keiichi AISO

    IPC: G02B6/028 ,  G02B6/02 ,  G02B6/036 ,  C03B37/018 ,  C03B37/03 ,  C03C13/04

    Abstract: Provided are an optical fiber and a manufacturing method of the optical fiber that can reduce transmission loss even when drawing is performed at a high tension and a high rate. An optical fiber has a core to which chlorine is added and a clad to which fluorine is added, chlorine of 9000 to 13000 ppm is added to the core, a relative refractive index difference Δ1 of the core to a pure silica glass is 0.09 to 0.13%, a relative refractive index difference Δ2 of the clad to a pure silica glass is −0.36 to −0.17%, a difference (Δ1−Δ2) between the relative refractive index difference Δ1 of the core and the relative refractive index difference Δ2 of the clad is larger than or equal to 0.30%, a mode field diameter at wavelength 1.31 μm is 8.8 to 9.6 μm, and a stress difference occurring at an interface between the core and the clad is lower than or equal to 60 MPa.

    METHOD OF PRODUCING OPTICAL FIBER PREFORM AND OPTICAL FIBER
    10.
    发明申请
    METHOD OF PRODUCING OPTICAL FIBER PREFORM AND OPTICAL FIBER 审中-公开

    公开(公告)号：US20170137316A1

    公开(公告)日：2017-05-18

    申请号：US15417732

    申请日：2017-01-27

    Applicant: FURUKAWA ELECTRIC CO., LTD.

    Inventor： Keiichi AISO ,  Tomohiro GONDA

    IPC: C03B37/014 ,  C03B37/025 ,  C03B37/018

    Abstract: A method of producing an optical fiber preform includes: an alkali-metal-doped silica glass body forming step of forming an alkali-metal-doped silica glass body doped with an alkali metal; a silica glass body forming step of forming a silica glass body to be at least a portion of a core portion around the alkali-metal-doped silica glass body such that the silica glass body contacts the alkali-metal-doped silica glass body; and a diffusing step of diffusing the alkali metal from the alkali-metal-doped silica glass body to the silica glass body by a heat treatment.

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