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    LIGHT IRRADIATION SYSTEM
    23.
    发明公开
    LIGHT IRRADIATION SYSTEM 审中-公开

    公开(公告)号：US20230310674A1

    公开(公告)日：2023-10-05

    申请号：US18015685

    申请日：2020-11-02

    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

    Inventor： Tomohiro TANIGUCHI ,  Ayako IWAKI ,  Kazuhide NAKAJIMA ,  Nobutomo HANZAWA ,  Takashi MATSUI ,  Yuto SAGAE ,  Chisato FUKAI ,  Kazutaka HARA ,  Atsuko KAWAKITA

    IPC: A61L2/10 ,  A61L2/24 ,  G02F1/37

    CPC classification number: A61L2/10 ,  A61L2/24 ,  G02F1/37 ,  A61L2202/11

    Abstract: An object of the present invention is to provide a light irradiation system capable of securing economic efficiency, flexibility, reliability, and safety, and further capable of reducing a transmission loss between a center side and a remote side.
    The present light irradiation system can secure economic efficiency by sharing a single light source installed on the center side with a plurality of irradiation places. The present light irradiation system can irradiate a place to be sterilized with ultraviolet light output by moving the optical fiber tip end on the remote side in a pinpoint manner, and can also secure flexibility. In addition, the present light irradiation system can secure reliability and safety by performing output control of the light source on the center side. Furthermore, in the present light irradiation system, light in a low-loss wavelength region is transmitted from the center side through the optical fiber, wavelength conversion is performed on the remote side, and thus the transmission loss between the center side and the remote side can be reduced.

    HOLE ASSISTED OPTICAL FIBER
    24.
    发明申请
    HOLE ASSISTED OPTICAL FIBER 有权

    公开(公告)号：US20220334307A1

    公开(公告)日：2022-10-20

    申请号：US17641061

    申请日：2019-09-18

    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

    Inventor： Saki NOZOE ,  Nobutomo HANZAWA ,  Yuto SAGAE ,  Kazuhide NAKAJIMA ,  Kyozo TSUJIKAWA

    IPC: G02B6/02 ,  G02B6/032

    Abstract: An object of the present invention is to provide an HAF having a structure in which the number of air holes is decreased to be smaller than that of a PCF and Rayleigh scattering loss may be more reduced than that in the existing HAF. The HAF according to the present invention includes a core portion having a uniform optical refractive index; a cladding portion having a uniform optical refractive index and surrounding the core portion; and a plurality of air holes arranged in two layers at positions configuring hexagonal closest packing excluding the core portion within the cladding portion along a longitudinal direction of the hole-assisted fiber, wherein a center-to-center spacing of the air holes is a sum of a radius Rin of an inscribed circle inscribed in the air holes in an inner layer and a radius d/2 of the air hole, and a radius “a” of the core portion and a relative refractive index difference Δ between the core portion and the cladding portion are present within a range where Rn, which is a ratio of a Rayleigh scattering coefficient Rsmf of a single mode optical fiber and an effective Rayleigh scattering coefficient Reff of the hole-assisted fiber, is equal to or less than 0.92.

    OPTICAL TRANSMISSION SYSTEM AND OPTICAL TRANSMISSION METHOD
    30.
    发明公开
    OPTICAL TRANSMISSION SYSTEM AND OPTICAL TRANSMISSION METHOD 审中-公开

    公开(公告)号：US20230336338A1

    公开(公告)日：2023-10-19

    申请号：US18009399

    申请日：2020-06-11

    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

    Inventor： Yuto SAGAE ,  Kazuhide NAKAJIMA ,  Taiji SAKAMOTO ,  Nobutomo HANZAWA ,  Takashi MATSUI ,  Noriyuki ARAKI ,  Shinichi AOZASA ,  Ryota IMADA ,  Yoko YAMASHITA

    IPC: H04L9/08 ,  H04B10/25

    CPC classification number: H04L9/088 ,  H04B10/25

    Abstract: It is an object of the present disclosure to reduce the risk of information exploitation by a malicious third party while allowing communication data to be demodulated in real time. An optical transmission system according to the present disclosure includes a transmitter which transmits an optical signal representing a cryptographic key and an optical signal representing communication data individually, an optical transmission path including a heterogeneous multi-core optical fiber having multiple cores, at least one of which has a different propagation delay time, the optical transmission path transmitting the optical signal representing the cryptographic key using a first core with a smaller delay among the multiple cores and the optical signal representing the communication data using a second core with a greater delay than the first core, and a receiver which individually receives the optical signals representing the cryptographic key and the communication data output from the individual cores of the optical transmission path and demodulates the received communication data on the basis of the received cryptographic key information.

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