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    Optical fiber, optical transmission line, and method for manufacturing optical fiber
    2.
    发明授权
    Optical fiber, optical transmission line, and method for manufacturing optical fiber 有权
    光纤，光传输线以及光纤制造方法

    公开(公告)号：US09188735B2

    公开(公告)日：2015-11-17

    申请号：US13887860

    申请日：2013-05-06

    Applicant: FUJIKURA LTD. ,  OSAKA PREFECTURE UNIVERSITY PUBLIC CORPORATION

    Inventor： Ryo Maruyama ,  Nobuo Kuwaki ,  Shoichiro Matsuo ,  Masaharu Ohashi

    IPC: G02B6/02 ,  G02B6/036

    CPC classification number: G02B6/02 ,  G02B6/02019 ,  G02B6/03627

    Abstract: An optical fiber (1) includes (i) an inner core (111) whose refractive index distribution has an α profile, (ii) an outer core (112) which surrounds the inner core (111), and (iii) a clad (12) which surrounds the outer core (112). In the optical fiber (1), Rd is set to not less than 0.15, where Rd is a ratio of a refractive index difference between the outer core (112) and the clad (12) to a refractive index difference between a center part of the inner core (111) and the clad (12).

    Abstract translation: 光纤（1）包括（i）其折射率分布具有α轮廓的内芯（111），（ii）围绕内芯（111）的外芯（112），以及（iii）包层 12）围绕外芯（112）。 在光纤（1）中，Rd被设定为不小于0.15，其中Rd是外芯（112）和包层（12）之间的折射率差之比与中心部分之间的折射率差 内芯（111）和包层（12）。

    MEASUREMENT METHOD, MEASUREMENT DEVICE, AND NON-TRANSITORY RECORDING MEDIUM
    4.
    发明申请
    MEASUREMENT METHOD, MEASUREMENT DEVICE, AND NON-TRANSITORY RECORDING MEDIUM 审中-公开

    公开(公告)号：US20190226941A1

    公开(公告)日：2019-07-25

    申请号：US16329130

    申请日：2017-05-01

    Applicant: FUJIKURA LTD. ,  NATIONAL UNIVERSITY CORPORATION SHIMANE UNIVERSITY

    Inventor： Ryo Maruyama ,  Nobuo Kuwaki ,  Fumihiko Ito

    IPC: G01M11/00

    Abstract: A measurement method for measuring an effective refractive index difference between two propagation modes of a multimode fiber is provided. The method includes: measuring a first Brillouin frequency shift v1 by specifying a frequency having a lowest-frequency peak out of peaks in a first frequency spectrum of scattered light in a first propagation mode; measuring a second Brillouin frequency shift v2 by specifying a frequency having a lowest-frequency peak out of peaks in a second frequency spectrum of scattered light in a second propagation mode; and calculating an effective refractive index difference Δneff in accordance with Δneff=(v1−v2)/(2kVL) with use of the first Brillouin frequency shift v1, the second Brillouin frequency shift v2, a predetermined wave number k of light in a vacuum, and a predetermined constant VL.

    Alignment device, splicing device, aligning method, and splicing method for optical fibers
    5.
    发明授权
    Alignment device, splicing device, aligning method, and splicing method for optical fibers 有权

    公开(公告)号：US10025032B2

    公开(公告)日：2018-07-17

    申请号：US15019416

    申请日：2016-02-09

    Applicant: FUJIKURA LTD.

    Inventor： Hiroki Hamaguchi ,  Nobuo Kuwaki

    IPC: G02B6/255 ,  G02B6/02 ,  G02B6/42 ,  G06T7/00

    Abstract: An optical fiber alignment device includes an image-capturing device capturing images of end surfaces of two optical fibers; an image-analyzing device obtaining position coordinates of two or more cores in the end surfaces from the image captured by the image-capturing device for each of the two optical fibers; a calculation device substituting the position coordinates of the cores obtained for each of the optical fibers in a theoretical equation that represents a total sum of axial deviation losses at the time of splicing the cores to each other, the calculation device obtaining a positional relationship between the end surfaces of the optical fibers from the theoretical equation such that the total sum of the axial deviation losses becomes a minimum; and a driving device arranging the optical fibers such that the end surfaces of the optical fibers satisfy the positional relationship obtained by the calculation device.

    Two-mode optical fiber and light transmission path
    6.
    发明授权
    Two-mode optical fiber and light transmission path 有权
    双模光纤和光传输路径

    公开(公告)号：US09507082B2

    公开(公告)日：2016-11-29

    申请号：US14419738

    申请日：2014-02-05

    Applicant: FUJIKURA LTD.

    Inventor： Ryo Maruyama ,  Nobuo Kuwaki ,  Shoichiro Matsuo

    IPC: G02B6/02 ,  G02B6/028 ,  G02B6/036

    CPC classification number: G02B6/02047 ,  G02B6/02238 ,  G02B6/0281 ,  G02B6/03627

    Abstract: Optical fibers Fp, Fn, included in a light transmission path, are two-mode optical fibers for propagating an LP01 mode component and an LP11 mode component contained in signal light, and a gradient dΔτ/dλ of a mode dispersion Δτ with respect to a wavelength λ in a wavelength band of 1530 nm to 1625 nm is |0.5| ps/km/nm or less. Symbols of mode dispersions Δτ of the optical fibers Fp, Fn are opposite to each other. The light transmission path can satisfactorily compensate the mode dispersion in a wide wavelength band.

    Abstract translation: 包括在光传输路径中的光纤Fp，Fn是用于传播包含在信号光中的LP01模式分量和LP11模式分量的双模光纤，以及相对于a的模式色散Δτ的梯度dΔτ/dλ 在1530nm至1625nm的波长带中的波长λ为| 0.5 | ps / km / nm以下。 光纤Fp，Fn的模式色散Δτ的符号彼此相反。 光传输路径可以令人满意地补偿宽波段中的模式色散。

    Measurement method, measurement device, and non-transitory recording medium
    7.
    发明授权
    Measurement method, measurement device, and non-transitory recording medium 有权

    公开(公告)号：US10760993B2

    公开(公告)日：2020-09-01

    申请号：US16329130

    申请日：2017-05-01

    Applicant: FUJIKURA LTD. ,  NATIONAL UNIVERSITY CORPORATION SHIMANE UNIVERSITY

    Inventor： Ryo Maruyama ,  Nobuo Kuwaki ,  Fumihiko Ito

    IPC: G01M11/00 ,  G01D5/353

    Abstract: A measurement method for measuring an effective refractive index difference between two propagation modes of a multimode fiber is provided. The method includes: measuring a first Brillouin frequency shift ν1 by specifying a frequency having a lowest-frequency peak out of peaks in a first frequency spectrum of scattered light in a first propagation mode; measuring a second Brillouin frequency shift ν2 by specifying a frequency having a lowest-frequency peak out of peaks in a second frequency spectrum of scattered light in a second propagation mode; and calculating an effective refractive index difference Δneff in accordance with Δneff=(ν1−ν2)/(2kVL) with use of the first Brillouin frequency shift ν1, the second Brillouin frequency shift ν2, a predetermined wave number k of light in a vacuum, and a predetermined constant VL.

    OPTICAL FIBER AND LIGHT TRANSMISSION PATH
    8.
    发明申请
    OPTICAL FIBER AND LIGHT TRANSMISSION PATH 有权
    光纤和光传输路径

    公开(公告)号：US20150212265A1

    公开(公告)日：2015-07-30

    申请号：US14419738

    申请日：2014-02-05

    Applicant: FUJIKURA LTD.

    Inventor： Ryo Maruyama ,  Nobuo Kuwaki ,  Shoichiro Matsuo

    IPC: G02B6/02 ,  G02B6/028

    CPC classification number: G02B6/02047 ,  G02B6/02238 ,  G02B6/0281 ,  G02B6/03627

    Abstract: Optical fibers Fp, Fn, included in a light transmission path, are two-mode optical fibers for propagating an LP01 mode component and an LP11 mode component contained in signal light, and a gradient dΔτ/dλ of a mode dispersion Δτ with respect to a wavelength λ in a wavelength band of 1530 nm to 1625 nm is |0.5| ps/km/nm or less. Symbols of mode dispersions Δτ of the optical fibers Fp, Fn are opposite to each other. The light transmission path can satisfactorily compensate the mode dispersion in a wide wavelength band.

    Abstract translation: 包含在光传输路径中的光纤Fp，Fn是用于传播信号光中包含的LP01模式分量和LP11模式分量的双模光纤，以及模式色散＆Dgr的梯度d＆Dgr;τ/dλ 相对于1530nm至1625nm的波长带中的波长λ为| 0.5 | ps / km / nm以下。 光纤Fp，Fn的模式色散＆Dgr;τ的符号彼此相反。 光传输路径可以令人满意地补偿宽波段中的模式色散。

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