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    ULTRAVIOLET LIGHT TRANSMISSION SYSTEM
    2.
    发明公开
    ULTRAVIOLET LIGHT TRANSMISSION SYSTEM 审中-公开

    公开(公告)号：US20240250757A1

    公开(公告)日：2024-07-25

    申请号：US18290383

    申请日：2021-05-19

    Applicant: Nippon Telegraph and Telephone Corporation

    Inventor： Chisato Fukai ,  Tomohiro TANIGUCHI ,  Kazuhide Nakajima ,  Ayako IWAKI ,  Takashi Matsui ,  Nobutomo HANZAWA ,  Yuto SAGAE ,  Kazutaka HARA ,  Atsuko KAWAKITA

    IPC: H04B10/80 ,  G02B6/02 ,  G02B6/04 ,  G02B6/10

    CPC classification number: H04B10/801 ,  G02B6/02042 ,  G02B6/04 ,  G02B6/102

    Abstract: An object of the present invention is to provide an ultraviolet optical transmission system in which cutting of an optical fiber or a complicated procedure is not necessary when an optical fiber is exchanged.
    The present invention provides a system in which light with an ultraviolet band is transmitted along an optical transmission path formed of a quartz-based optical fiber, and in which an optical transmission unit is switched by a rotation mechanism in which an optical transmission path of one of an optical coupling unit rotates about an axis, the optical coupling unit including an optical transmission path including a plurality of optical transmission units on the same circumference from a center on an end surface of the optical coupling unit; an optical transmission path in which the optical transmission units are arranged on the same circumference as a circumference on which the plurality of optical transmission units are arranged; two ferrules each containing the two optical transmission paths; and a cylindrical sleeve in which the two ferrules are inserted in a hollow.

    OPTICAL FIBER EVALUATION METHOD AND OPTICAL FIBER EVALUATION APPARATUS
    4.
    发明公开
    OPTICAL FIBER EVALUATION METHOD AND OPTICAL FIBER EVALUATION APPARATUS 审中-公开

    公开(公告)号：US20230144218A1

    公开(公告)日：2023-05-11

    申请号：US17926655

    申请日：2020-06-03

    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

    Inventor： Tomokazu ODA ,  Hiroyuki OSHIDA ,  Daisuke IIDA ,  Atsushi NAKAMURA ,  Yuto SAGAE

    IPC: G01M11/00

    CPC classification number: G01M11/39

    Abstract: The present invention has an object to provide an optical fiber testing method and an optical fiber testing device capable of measuring the delay ratio between the modes at each position of a fiber over a long distance in which a plurality of modes propagate.
    An optical fiber testing method and its device according to the present invention, measure the change amount for the wave number k of a Brillouin Frequency Shift ν in stimulated Brillouin scattering generated in the same acoustic mode, with respect to each target propagation mode. Thereby, the ratio of the change amount measured at each propagation mode is acquired as the group delay ratio between the modes.

    AIR CONDITIONING EQUIPMENT
    5.
    发明申请
    AIR CONDITIONING EQUIPMENT 有权

    公开(公告)号：US20250001036A1

    公开(公告)日：2025-01-02

    申请号：US18695310

    申请日：2021-09-30

    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

    Inventor： Asuka MIYAKE ,  Hitoshi SISHIMO ,  Ryuji YAMAMOTO ,  Tomohiro TANIGUCHI ,  Ayako IWAKI ,  Satoshi NARIKAWA ,  Takahito KIRIHARA ,  Kazuhide NAKAJIMA ,  Takashi MATSUI ,  Yuto SAGAE ,  Chisato FUKAI ,  Nobutomo HANZAWA

    IPC: A61L9/20 ,  F24F8/167 ,  F24F8/22

    Abstract: An object of the present invention is to provide an air conditioner unit that can fully demonstrate the sterilization effect on air with a large flow rate, even by a method of irradiating a filter and a coil with ultraviolet light. The air conditioner unit according to the present invention includes a filter 20 through which air passes, a plurality of optical fibers 16 arranged in such a manner that one ends thereof are close to a surface of the filter 20 and arranged at predetermined intervals, and a light source 30 that supplies ultraviolet light from the other end of each of the optical fibers 16. Since the intensity of the light is inversely proportional to the square of the distance from the light source, if the same sterilization effect is to be obtained, the shorter the irradiation distance, the smaller the irradiation intensity of the ultraviolet light can be. That is, by bringing the tips of the optical fibers close to the surface of the filter, the filter can be sterilized by an LED having a small output.

    OPTICAL FIBER
    6.
    发明公开
    OPTICAL FIBER 审中-公开

    公开(公告)号：US20240061168A1

    公开(公告)日：2024-02-22

    申请号：US18267917

    申请日：2021-01-05

    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

    Inventor： Yuto SAGAE ,  Takashi MATSUI ,  Kazuhide NAKAJIMA

    IPC: G02B6/02

    CPC classification number: G02B6/02042 ,  G02B6/021

    Abstract: An object of the present invention is to achieve a low delay core applicable to a Master channel of a Master-Slave CPE (MS-CPE) transmission method with a general-purpose refractive index distribution structure.
    An optical fiber according to the present invention is a single-mode optical fiber, and has an SI-type refractive index distribution structure, in which a clad region relative refractive index difference Δ (%) with respect to a core region refractive index, a radius a (μm) of the core region, and a group delay time difference Δτ between the Master channel and the Slave channel satisfy “Mathematical Expression 19” and “Mathematical Expression 20”, or



    has a W-type refractive index distribution structure, in which a mode field diameter MFD is 9.5 to 10.1 μm, and a relative refractive index difference Δ1 (%) of a low refractive index layer with respect to a core, a relative refractive index difference Δ2 (%) of the clad region with respect to the core, the core radius a1, and the group delay time difference Δτ between the Master channel and the Slave channel satisfy “Mathematical Expression 41”.

    MULTI-CORE OPTICAL FIBER AND DESIGN METHOD
    7.
    发明公开
    MULTI-CORE OPTICAL FIBER AND DESIGN METHOD 审中-公开

    公开(公告)号：US20230341618A1

    公开(公告)日：2023-10-26

    申请号：US18020539

    申请日：2020-08-12

    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

    Inventor： Takashi MATSUI ,  Kazuhide NAKAJIMA ,  Taiji SAKAMOTO ,  Yuto SAGAE

    IPC: G02B27/00 ,  G02B6/02

    CPC classification number: G02B6/02042 ,  G02B6/02028 ,  G02B27/0012

    Abstract: The present invention is to provide a multi-core optical fiber that can expand its transmission wavelength band, and extend its transmission distance by reducing crosstalk, and also provide a method for designing the multi-core optical fiber. A multi-core optical fiber according to the present invention includes: four cores that are arranged in a square lattice pattern in a longitudinal direction; and a cladding region that is formed around the outer peripheral portions of the cores and has a lower refractive index than the cores, the absolute value of the relative refractive index difference between the cores and the cladding region being represented by Δ. In the multi-core optical fiber, the diameter of the cladding region is 125 ± 1 µm, the cutoff wavelength is 1.45 µm or shorter, the mode field diameter MFD at a wavelength of 1.55 µm is 9.5 to 10.0 µm, the bending loss at a wavelength of 1.625 µm and with a bending radius of 30 mm is 0.1 dB/100 turns or smaller, and the inter-core crosstalk at the wavelength of 1.625 µm is -47 dB/km or smaller.

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

    公开(公告)号：US20230244028A1

    公开(公告)日：2023-08-03

    申请号：US17928498

    申请日：2020-06-03

    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

    Inventor： Yuto SAGAE ,  Takashi MATSUI ,  Kazuhide NAKAJIMA

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

    CPC classification number: G02B6/03622 ,  G02B6/0281 ,  G02B6/02366

    Abstract: The optical fiber according to the present invention includes, in a cross section of the optical fiber, one core region (11) and a cladding region (12) that is arranged on an outer periphery of the core region. The cladding region is a medium that has a lower refractive index than that of the core region and also has a smaller refractive index wavelength dispersion than that of the core region. The optical fiber has a solid core and therefore, allows more reduction in the Rayleigh scattering loss compared to an optical fiber having a hollow core. In addition, since the optical fiber adopts, for the cladding region, a medium that has a smaller refractive index wavelength dispersion than that of the core region, it allows a reduction in the wavelength dispersion of neff.

    OPTICAL FIBER EVALUATION DEVICE AND OPTICAL FIBER EVALUATION METHOD
    9.
    发明公开
    OPTICAL FIBER EVALUATION DEVICE AND OPTICAL FIBER EVALUATION METHOD 审中-公开

    公开(公告)号：US20230221487A1

    公开(公告)日：2023-07-13

    申请号：US18009784

    申请日：2020-06-24

    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

    Inventor： Nobutomo HANZAWA ,  Takashi MATSUI ,  Yuto SAGAE ,  Kazuhide NAKAJIMA

    IPC: G02B6/02

    CPC classification number: G02B6/02042 ,  G02B6/02342

    Abstract: The purpose of the present invention is to provide an optical fiber evaluation equipment and an optical fiber evaluation method that evaluate the center of a cladding of an MCF and a deviation of the center of each core of the MCF from a design value with ease and high accuracy.
    The optical fiber evaluation equipment according to the present invention approximates the outside diameter of a cladding by a circle, based on a cross-sectional image of an MCF, and determines the center of the circle as the center of the cladding. In addition, the optical fiber evaluation equipment according to the present invention obtains the center coordinates of cores with an origin at the center of the circle, rotates the cross-sectional image so as to minimize a difference between the center coordinates and design coordinates of each core, and derives the minimum value thereof as the amount of deviation of the center of each core.

    ACOUSTIC MODE PROPAGATION SPEED MEASUREMENT METHOD AND ACOUSTIC MODE PROPAGATION SPEED MEASUREMENT DEVICE
    10.
    发明申请
    ACOUSTIC MODE PROPAGATION SPEED MEASUREMENT METHOD AND ACOUSTIC MODE PROPAGATION SPEED MEASUREMENT DEVICE 有权

    公开(公告)号：US20220170817A1

    公开(公告)日：2022-06-02

    申请号：US17434949

    申请日：2020-02-19

    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

    Inventor： Yuto SAGAE ,  Takashi MATSUI ,  Kyozo TSUJIKAWA ,  Kazuhide NAKAJIMA

    IPC: G01M11/00

    Abstract: An objective is to provide an acoustic mode propagation speed measurement method and an acoustic mode propagation speed measurement device capable of measuring a propagation speed of an acoustic mode without cutting or processing an optical fiber wire.
    According to the present invention, an acoustic mode propagation speed measurement method includes: acquiring a frequency shift spectrum of Brillouin scattered light generated in an optical fiber; fitting the frequency shift spectrum using a Gauss function; acquiring a spectral full-width at half maximum w from a fitted curve using the Gauss function; and calculating a propagation speed VA of an acoustic mode of the optical fiber by substituting the acquired spectral full-width at half maximum w into a linear function of the spectral full-width at half maximum w and the propagation speed VA of the acoustic mode.

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