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    Optical amplifier, optical amplification system, wavelength converter, and optical communication system
    3.
    发明授权
    Optical amplifier, optical amplification system, wavelength converter, and optical communication system 有权

    公开(公告)号：US10816873B2

    公开(公告)日：2020-10-27

    申请号：US15952726

    申请日：2018-04-13

    Applicant: FURUKAWA ELECTRIC CO., LTD.

    Inventor： Shigehiro Takasaka

    IPC: G02F1/39 ,  H04B10/2507 ,  H04J14/02

    Abstract: An optical amplifier includes: a pump-light source unit outputting pump light beams having respective phases modulated; a polarization multiplexer/demultiplexer having first, second, and third ports, demultiplexing a light beam, input from the first port, into polarization components and outputting the demultiplexed light components from the second port and the third port; a first polarization-sensitive optical amplifying fiber unit connected to the second port of the polarization multiplexer/demultiplexer; a second polarization-sensitive optical amplifying fiber unit connected to the third port of the polarization multiplexer/demultiplexer; optical multiplexers/demultiplexers connected to the first polarization-sensitive optical amplifying fiber unit and the second polarization-sensitive optical amplifying fiber unit, respectively; an optical discharge unit, connected between the first polarization-sensitive optical amplifying fiber unit and the second polarization-sensitive optical amplifying fiber unit, discharging the pump light beams to outside the optical loop; and an optical circulator, having first, second, and third ports, outputting a signal light beam.

    Optical amplifier, optical amplifying system, wavelength converter, optical amplification method, and optical communication system
    4.
    发明授权
    Optical amplifier, optical amplifying system, wavelength converter, optical amplification method, and optical communication system 有权
    光放大器，光放大系统，波长转换器，光放大法和光通信系统

    公开(公告)号：US09270076B2

    公开(公告)日：2016-02-23

    申请号：US14018225

    申请日：2013-09-04

    Applicant: Furukawa Electric Co., Ltd.

    Inventor： Shigehiro Takasaka ,  Yu Mimura

    IPC: H01S3/10 ,  G02F1/39 ,  H01S3/067 ,  H04B10/294 ,  H01S3/30

    CPC classification number: H01S3/10023 ,  G02F1/395 ,  G02F2201/04 ,  G02F2201/307 ,  G02F2203/50 ,  G02F2203/585 ,  H01S3/06725 ,  H01S3/06754 ,  H01S3/302 ,  H01S2301/04 ,  H04B10/294

    Abstract: An optical amplifier includes an optical gain fiber into which signal light and pump light are input and at least one relative phase shifter is inserted. Preferably, the relative phase shifter is inserted so that the relative phase in the lengthwise direction of the optical gain fiber falls within a predetermined range containing 0.5π. Preferably, the optical gain fiber is a highly non-linear optical fiber having a non-linearity constant of at least 10/W/km. Preferably, the dispersion of the optical gain fiber is within the range from −1 ps/nm/km to 1 ps/nm/km in an amplification band. Preferably, the absolute value of the dispersion slope of the optical gain fiber at a zero dispersion wavelength is no greater than 0.05 ps/nm2/km.

    Abstract translation: 光放大器包括一个光增益光纤，信号光和泵浦光被输入到该增益光纤中，至少有一个相对移相器被插入。 优选地，插入相对移相器，使得光学增益光纤的长度方向上的相对相位落在包含0.5＆pgr的预定范围内。 优选地，光增益光纤是具有至少10 / W / km的非线性常数的高度非线性的光纤。 优选地，光增益光纤的色散在放大频带内在-1ps / nm / km至1ps / nm / km的范围内。 优选地，在零色散波长处的光学增益光纤的色散斜率的绝对值不大于0.05ps / nm2 / km。

    Multi-core optical amplifying fiber, multi-core optical fiber amplifier, and optical communication system
    5.
    发明授权
    Multi-core optical amplifying fiber, multi-core optical fiber amplifier, and optical communication system 有权

    公开(公告)号：US12248171B2

    公开(公告)日：2025-03-11

    申请号：US17931732

    申请日：2022-09-13

    Applicant: FURUKAWA ELECTRIC CO., LTD.

    Inventor： Shigehiro Takasaka ,  Koichi Maeda ,  Ryuichi Sugizaki

    IPC: G02B6/02 ,  G02B6/036 ,  G02B6/04 ,  H01S3/094

    Abstract: A multi-core optical amplifying fiber includes: core portions doped with a rare-earth element; an inner cladding portion; and an outer cladding portion. A mode field diameter of each core portion at a wavelength at which the rare-earth element performs optical amplification is 5 μm to 11 μm, a relative refractive-index difference of the maximum refractive index of each core portion with respect to the inner cladding portion is 0.35% to 2%, a core-to-core distance is set such that total inter-core crosstalk is −40 dB/100 m or lower in an optical amplification wavelength band subjected to the optical amplification, a cladding thickness is smaller than a value obtained by adding the mode field diameter to a minimum value of the core-to-core distance, and a ratio of a total sectional area of the core portions to a sectional area of the inner cladding portion is 1.9% or more.

    Cable, cable shape sensing system, sensing system, and cable shape sensing method
    7.
    发明授权
    Cable, cable shape sensing system, sensing system, and cable shape sensing method 有权

    公开(公告)号：US11519759B2

    公开(公告)日：2022-12-06

    申请号：US17136446

    申请日：2020-12-29

    Applicant: FURUKAWA ELECTRIC CO., LTD.

    Inventor： Masateru Tadakuma ,  Shigehiro Takasaka ,  Ryuichi Sugizaki

    IPC: G02B6/02 ,  G01D5/353 ,  G01B11/16

    Abstract: A cable comprising: a plurality of optical fiber cores; and one or more optical fiber core wires including one or more of the optical fiber cores. Further, at least one of the optical fiber core wire is fixed at a plurality of positions in a longitudinal direction of the cable so as to achieve substantially no displacement in a cable radial direction, at least a pair of the optical fiber core wires are fixed in a plane perpendicular to the longitudinal direction of the cable so as to achieve substantially no displacement relative to each other, and sensing of a strain profile in the longitudinal direction of at least the pair of the optical fiber core wires leads to achievement of sensing of a shape of the cable in the longitudinal direction.

    Optical coupler and optical amplifier
    9.
    发明授权
    Optical coupler and optical amplifier 有权

    公开(公告)号：US11073656B2

    公开(公告)日：2021-07-27

    申请号：US16893589

    申请日：2020-06-05

    Applicant: FURUKAWA ELECTRIC CO., LTD.

    Inventor： Shigehiro Takasaka ,  Koichi Maeda

    IPC: G02B6/028 ,  G02B6/02 ,  G02B6/42 ,  G02B6/255 ,  H01S5/50

    Abstract: An aim is to provide an optical coupler that contributes increasing pump-efficiency in an optical amplifier, and the optical amplifier. The optical amplifier includes: a main optical fiber that includes a core transmitting signal light, an inner cladding portion formed around an outer periphery of the core and having a refractive index lower than a refractive index of the core, and an outer cladding portion formed around an outer periphery of the inner cladding portion and having a refractive index lower than the refractive index of the inner cladding portion, a part of the outer cladding portion of which in a longitudinal direction being removed; and at least one pump-light input-output optical fiber that is fusion-spliced to the inner cladding portion of the main optical fiber at the portion where the outer cladding portion is removed, an average refractive index of which in a contact region where the pump-light input-output optical fiber is in contact with the inner cladding portion being larger than the refractive index of the inner cladding portion. Pump-light propagating in the pump-light input-output optical fiber is coupled to the inner cladding portion from the contact region and propagates in the inner cladding portion, or the pump-light propagating in the inner cladding portion is coupled to the pump-light input-output optical fiber from the contact region and propagates in the pump-light input-output optical fiber.

    OPTICAL AMPLIFIER, OPTICAL AMPLIFICATION SYSTEM, WAVELENGTH CONVERTER, AND OPTICAL COMMUNICATION SYSTEM
    10.
    发明申请
    OPTICAL AMPLIFIER, OPTICAL AMPLIFICATION SYSTEM, WAVELENGTH CONVERTER, AND OPTICAL COMMUNICATION SYSTEM 审中-公开

    公开(公告)号：US20180231870A1

    公开(公告)日：2018-08-16

    申请号：US15952726

    申请日：2018-04-13

    Applicant: FURUKAWA ELECTRIC CO., LTD.

    Inventor： Shigehiro Takasaka

    IPC: G02F1/39

    Abstract: An optical amplifier includes: a pump-light source unit outputting pump light beams having respective phases modulated; a polarization multiplexer/demultiplexer having first, second, and third ports, demultiplexing a light beam, input from the first port, into polarization components and outputting the demultiplexed light components from the second port and the third port; a first polarization-sensitive optical amplifying fiber unit connected to the second port of the polarization multiplexer/demultiplexer; a second polarization-sensitive optical amplifying fiber unit connected to the third port of the polarization multiplexer/demultiplexer; optical multiplexers/demultiplexers connected to the first polarization-sensitive optical amplifying fiber unit and the second polarization-sensitive optical amplifying fiber unit, respectively; an optical discharge unit, connected between the first polarization-sensitive optical amplifying fiber unit and the second polarization-sensitive optical amplifying fiber unit, discharging the pump light beams to outside the optical loop; and an optical circulator, having first, second, and third ports, outputting a signal light beam.

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