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

    公开(公告)号：US20240004126A1

    公开(公告)日：2024-01-04

    申请号：US18469607

    申请日：2023-09-19

    Applicant: FURUKAWA ELECTRIC CO., LTD.

    Inventor： Kazunori MUKASA

    IPC: G02B6/02 ,  G02B6/036

    CPC classification number: G02B6/02009 ,  G02B6/0365 ,  G02B6/03627 ,  G02B6/02395

    Abstract: An optical fiber includes: a core portion; and a cladding portion configured to surround an outer periphery of the core portion, the cladding portion having a refractive index lower than a maximum refractive index of the core portion, and containing a dopant to reduce the refractive index. The core portion includes a center core in which an average refractive index is maximized in the optical fiber, a relative refractive-index difference of the average refractive index of the center core with respect to an average refractive index of the cladding portion is 0.20% to 0.50%, an outer diameter of the cladding portion is 70 μm to 120 μm, a cable cutoff wavelength is equal to or smaller than 1530 nm, and a transmission loss at a wavelength of 1550 nm is equal to or less than 0.18 dB/km.

    OPTICAL FIBER AND METHOD FOR MANUFACTURING OPTICAL FIBER
    3.
    发明申请
    OPTICAL FIBER AND METHOD FOR MANUFACTURING OPTICAL FIBER 有权

    公开(公告)号：US20210294030A1

    公开(公告)日：2021-09-23

    申请号：US17342599

    申请日：2021-06-09

    Applicant: FURUKAWA ELECTRIC CO., LTD.

    Inventor： Kazunori MUKASA

    IPC: G02B6/036 ,  G02B6/02

    Abstract: An optical fiber includes: a central core portion; an intermediate layer formed around an outer circumference of the central core portion; a trench layer formed around an outer circumference of the intermediate layer; and a cladding portion formed around an outer circumference of the trench layer. Further, when, relative to the cladding portion, a relative refractive-index difference of the central core portion is Δ1, a relative refractive-index difference of the intermediate layer is Δ2, and a relative refractive-index difference of the trench layer is Δ3, relationships Δ1>Δ2>Δ3 and 0>Δ3 are satisfied and Δ1 is equal to or greater than 0.34% and equal to or less than 0.40%, |Δ3| is equal to or less than 0.25%, and Δ1×|Δ3| is less than 0.08%2.

    OPTICAL FIBER
    4.
    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%.

    OPTICAL FIBER
    7.
    发明申请
    OPTICAL FIBER 有权

    公开(公告)号：US20230020502A1

    公开(公告)日：2023-01-19

    申请号：US17930547

    申请日：2022-09-08

    Applicant: FURUKAWA ELECTRIC CO., LTD.

    Inventor： Kazunori MUKASA ,  Shugo TAKEUCHI

    IPC: G02B6/036 ,  G02B6/02

    Abstract: An optical fiber includes: a central core portion; an intermediate layer configured to surround an outer periphery of the central core portion; a trench layer configured to surround an outer periphery of the intermediate layer; and a cladding portion configured to surround an outer periphery of the trench layer. The central core portion is made of silica based glass that does not contain germanium (Ge). Δ1>Δ2>Δ3 and ΔClad>Δ3, where Δ1 represents an average maximum relative refractive-index difference of the central core portion relative to pure quartz glass, Δ2 represents an average relative refractive-index difference of the intermediate layer relative to the pure quartz glass, Δ3 represents an average relative refractive-index difference of the trench layer relative to the pure quartz glass, and ΔClad represents an average relative refractive-index difference of the cladding portion relative to the pure quartz glass. Δ1 is equal to or larger than 0.05%.

    OPTICAL FIBER CABLE
    8.
    发明申请
    OPTICAL FIBER CABLE 有权

    公开(公告)号：US20210223475A1

    公开(公告)日：2021-07-22

    申请号：US17220969

    申请日：2021-04-02

    Applicant: FURUKAWA ELECTRIC CO., LTD.

    Inventor： Kazunori MUKASA

    IPC: G02B6/255 ,  G02B6/38

    Abstract: An optical fiber cable includes: a small-diameter optical fiber including a core and a cladding portion made of glass and having a cladding diameter of 120 μm or less; a normal optical fiber that is optically connected to at least one end of the small-diameter optical fiber, includes a core and a cladding portion made of glass, and has a cladding diameter conforming to a standard of 125 μm; an optical coupling mechanism provided between the small-diameter optical fiber and the normal optical fiber; and a sheath covering an outer periphery of the small-diameter optical fiber only, among the small-diameter optical fiber and the normal optical fiber. Further, the end of the small-diameter optical fiber is positioned outside the sheath.

    HOLEY FIBER AND METHOD OF PRODUCING THE SAME
    10.
    发明申请
    HOLEY FIBER AND METHOD OF PRODUCING THE SAME 有权
    孔纤维及其制造方法

    公开(公告)号：US20140193128A1

    公开(公告)日：2014-07-10

    申请号：US14203019

    申请日：2014-03-10

    Applicant: Furukawa Electric Co., Ltd.

    Inventor： Kazunori MUKASA

    IPC: G02B6/02

    CPC classification number: G02B6/02357 ,  G01N21/3504 ,  G01N2021/0346 ,  G02B6/02338 ,  G02B6/02347 ,  G02B6/02385

    Abstract: A holey fiber includes: a core portion; an inner-cladding portion positioned at an outer periphery of the core portion, the inner-cladding portion having a plurality of inner holes formed in a layered structure around the core portion; and an outer-cladding portion positioned at an outer periphery of the inner-cladding portion, the outer-cladding portion having a plurality of outer holes formed in a layered structure around the inner-cladding portion. The inner holes are disposed to form a triangular lattice of which lattice constant Λ1 is equal to or smaller than 2.0 μm and to form equal to or greater than two layers. The outer holes are disposed to form a triangular lattice of which lattice constant Λ2 is greater than the Λ1 and equal to or larger than 3.0 μm and to form equal to or greater than two layers. The overlap index is equal to or greater than 2.0%.

    Abstract translation: 多孔纤维包括：芯部; 位于所述芯部的外周的内包层部，所述内包层部具有围绕所述芯部形成为层叠结构的多个内孔; 以及位于所述内包层部分的外周的外包层部分，所述外包层部分具有围绕所述内包层部分形成为层状结构的多个外孔。 内孔被设置为形成晶格常数Λ1等于或小于2.0μm并形成等于或大于两层的三角形格子。 外孔设置成形成三角形格子，其晶格常数Λ2大于Λ1且等于或大于3.0μm，并形成等于或大于两层。 重叠指数等于或大于2.0％。

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