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    MULTICORE OPTICAL FIBER AND DESIGN METHOD
    31.
    发明申请
    MULTICORE OPTICAL FIBER AND DESIGN METHOD 有权

    公开(公告)号：US20220276430A1

    公开(公告)日：2022-09-01

    申请号：US17627866

    申请日：2020-07-21

    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

    Inventor： Taiji SAKAMOTO ,  Kazuhide NAKAJIMA ,  Takashi MATSUI ,  Kyozo TSUJIKAWA ,  Kunimasa SAITOH ,  Takeshi FUJISAWA

    IPC: G02B6/02 ,  G02B27/00

    Abstract: An object of the present invention is to provide a multi-core optical fiber that can prevent an increase in bending loss even when a distance between a peripheral core and a cladding boundary is decreased, and can improve a bending loss characteristic in a state where an influence on a cutoff wavelength and a mode field diameter is small, and a design method thereof.
    The multi-core optical fiber according to the present invention is an optical fiber in which two or more core regions are arranged in a cladding region having a refractive index lower than a refractive index of the core at a minimum core interval, a ring-shaped low refractive index region surrounding the core and having a refractive index lower than the refractive index of the cladding region is provided, a bending loss after the provision of the ring-shaped low refractive index region is reduced as compared with a characteristic in a case where the ring-shaped low refractive index region is not provided, and at the same time, a change in mode field diameter after the provision of the ring-shaped low refractive index region is not changed as compared with a characteristic in a case where the ring-shaped low refractive index region is not provided.

    OPTICAL SIDE INPUT/OUTPUT CIRCUIT
    36.
    发明申请
    OPTICAL SIDE INPUT/OUTPUT CIRCUIT 有权

    公开(公告)号：US20240369769A1

    公开(公告)日：2024-11-07

    申请号：US18573170

    申请日：2021-06-28

    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

    Inventor： Yoko YAMASHITA ,  Takayoshi MORI ,  Takashi MATSUI ,  Kazuhide NAKAJIMA

    IPC: G02B6/293 ,  G02B6/02

    Abstract: An object of the present disclosure is to provide an optical side input/output circuit for allowing light for being input into or output from a side surface of an optical fiber with high efficiency.
    The present disclosure is an optical side input/output circuit including: a tap unit in which a tap waveguide is formed for allowing light for propagation through a core of an optical fiber for being input into or output from a side surface of the optical fiber; and a refractive index matching unit, having a refractive index higher than a refractive index of the tap waveguide, on the side surface of the optical fiber where the light is allowed for being input or output by the tap waveguide.

    OPTICAL TRANSMISSION SYSTEM AND OPTICAL TRANSMISSION METHOD
    40.
    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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