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    OPTICAL FIBER PREFORM PRODUCTION METHOD, OPTICAL FIBER PREFORM, AND OPTICAL FIBER PRODUCTION METHOD
    2.
    发明公开
    OPTICAL FIBER PREFORM PRODUCTION METHOD, OPTICAL FIBER PREFORM, AND OPTICAL FIBER PRODUCTION METHOD 审中-公开

    公开(公告)号：US20240051865A1

    公开(公告)日：2024-02-15

    申请号：US18491956

    申请日：2023-10-23

    Applicant: Fujikura Ltd.

    Inventor： Yoshimichi Amma ,  Katsuhiro Takenaga ,  Ryohei Fukumoto

    IPC: C03B37/027 ,  C03B37/012 ,  G02B6/02

    CPC classification number: C03B37/02718 ,  C03B37/01222 ,  G02B6/02042

    Abstract: An optical fiber preform includes: a cladding glass body that is a cladding of an optical fiber, is cylindrical, and comprises an inner hole along an axial direction; a glass rod accommodated in the inner hole; and a dummy silica rod selected from either one of a first solid dummy silica rod fixed to a first end of the cladding glass body that closes a first end of the inner hole positioned at the first end of the cladding glass body, or a second solid dummy silica rod accommodated and integrated in a connecting glass tube fixed to the first end to close a first tip opening end of the connecting glass tube. A tip seal that closes a second end of the inner hole at a second end of the cladding glass body is provided in the second end of the cladding glass body.

    Multicore fiber
    4.
    发明授权
    Multicore fiber 有权

    公开(公告)号：US10295736B2

    公开(公告)日：2019-05-21

    申请号：US15780143

    申请日：2016-10-25

    Applicant: FUJIKURA LTD.

    Inventor： Yoshimichi Amma ,  Katsuhiro Takenaga ,  Shota Saito

    IPC: G02B6/02 ,  G02B6/036

    Abstract: A multicore fiber includes a plurality of cores including a first core and a cladding surrounding the plurality of cores. The first core includes: an inner core; and an outer core surrounding the inner core with no gap and having a refractive index higher than a refractive index of the inner core and a refractive index of the cladding. The core is not doped with any rare earth element. At least two LP mode light beams at a predetermined wavelength propagate through the first core at an attenuation of 0.3 dB/km or less.

    MULTICORE FIBER
    6.
    发明申请
    MULTICORE FIBER 审中-公开

    公开(公告)号：US20180356590A1

    公开(公告)日：2018-12-13

    申请号：US15780143

    申请日：2016-10-25

    Applicant: FUJIKURA LTD.

    Inventor： Yoshimichi Amma ,  Katsuhiro Takenaga ,  Shota Saito

    IPC: G02B6/036 ,  G02B6/02

    CPC classification number: G02B6/03611 ,  G02B6/02 ,  G02B6/02042 ,  G02B6/036

    Abstract: A multicore fiber includes a plurality of cores including a first core and a cladding surrounding the plurality of cores. The first core includes: an inner core; and an outer core surrounding the inner core with no gap and having a refractive index higher than a refractive index of the inner core and a refractive index of the cladding. The core is not doped with any rare earth element. At least two LP mode light beams at a predetermined wavelength propagate through the first core at an attenuation of 0.3 dB/km or less.

    Multi-core fiber
    9.
    发明授权
    Multi-core fiber 有权
    多芯光纤

    公开(公告)号：US09588284B2

    公开(公告)日：2017-03-07

    申请号：US15062530

    申请日：2016-03-07

    Applicant: FUJIKURA LTD. ,  NATIONAL UNIVERSITY CORPORATION HOKKAIDO UNIVERSITY

    Inventor： Yusuke Sasaki ,  Katsuhiro Takenaga ,  Yoshimichi Amma ,  Kunimasa Saitoh

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

    CPC classification number: G02B6/02042 ,  G02B6/02219 ,  G02B6/028 ,  G02B6/0288 ,  G02B6/036

    Abstract: In a C band and an L band, the effective refractive indices of light propagating through the cores 11 and 21 adjacent to each other are different from each other such that a magnitude of crosstalk of light of a highest-order LP mode commonly propagating through the cores 11 and 21 adjacent to each other between the cores 11 and 21 adjacent to each other becomes a peak at a bending diameter smaller than a diameter of 100 mm, and the core has a higher refractive index in a center portion than in an outer circumferential portion such that a differential mode group delay of the cores 11 and 12 is 700 picoseconds/km or less.

    Abstract translation: 在C波段和L波段中，通过彼此相邻的芯11和21传播的光的有效折射率彼此不同，使得最高阶LP模式的光的串扰的大小通常传播通过 在彼此相邻的芯11和21之间彼此相邻的芯11和21在弯曲直径小于直径100mm的峰处，并且芯在中心部分具有比外周更高的折射率 使得芯11和12的差模组群延迟为700皮秒/ km或更小。

    OPTICAL DEVICE
    10.
    发明申请
    OPTICAL DEVICE 有权
    光学装置

    公开(公告)号：US20160245992A1

    公开(公告)日：2016-08-25

    申请号：US15045645

    申请日：2016-02-17

    Applicant: FUJIKURA LTD. ,  NATIONAL UNIVERSITY CORPORATION HOKKAIDO UNIVERSITY

    Inventor： Katsuhiro Takenaga ,  Hitoshi Uemura ,  Kunimasa Saitoh

    IPC: G02B6/02 ,  G02B6/26 ,  G02B6/036

    CPC classification number: G02B6/02042 ,  G02B6/02019 ,  G02B6/02376 ,  G02B6/03644 ,  G02B6/262 ,  G02B6/368 ,  G02B6/3885

    Abstract: 0.5377×r2−7.7≦V2/V1≦0.5377×r2−5.7, 3≦r2/r1≦5 are satisfied, where a radius of the inner core before tapered in diameter is defined as r1, a radius of the outer core before tapered in diameter is defined as r2, a refractive index volume formed of a product of a cross sectional area of the inner core and a relative refractive index difference of the inner core to the cladding before tapered in diameter is defined as V1, and a refractive index volume formed of a product of a cross sectional area of the outer core and a relative refractive index difference of the outer core to the cladding before tapered in diameter is defined as V2.

    Abstract translation: 0.5377×r2-7.7≤V2/V1≤0.5377×r2-5.7,3≤r2/r1≤5，其中，将锥形直径之前的内芯的半径定义为r1，外芯的半径在锥形之前 直径定义为r2，由内芯横截面积和内芯与包层的直径相对折射率差的乘积形成的折射率体积定义为V1，折射率 由外径的横截面积和外芯与包层之间的直径相对折射率差的乘积形成的体积定义为V2。

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