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    OPTICAL SIDE INPUT/OUTPUT CIRCUIT
    42.
    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
    46.
    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.

    OPTICAL CONNECTOR
    47.
    发明公开
    OPTICAL CONNECTOR 审中-公开

    公开(公告)号：US20230305223A1

    公开(公告)日：2023-09-28

    申请号：US18019193

    申请日：2020-08-05

    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

    Inventor： Yoko YAMASHITA ,  Kazuhide NAKAJIMA ,  Takashi MATSUI

    IPC: G02B6/028 ,  G02B6/38

    CPC classification number: G02B6/0288 ,  G02B6/3825

    Abstract: An object of the present invention is to provide a simple method capable of reducing MDL after construction of a transmission path.
    An optical connector 301 is an optical connector including a multimode optical fiber 11, in which a core 20 of the multimode optical fiber 11 includes a plurality of cavities 25 along a central axis. The optical connector 301 further includes a ferrule 12 surrounding the multimode optical fiber 11 and a connector plug 13 serving as a connection with another optical connector. The shape of the optical connector 13 is a shape of a generally used SC connector, FC connector, MT connector, or the like.

    PROPAGATION MODE LOSS DIFFERENCE COMPENSATOR
    50.
    发明公开
    PROPAGATION MODE LOSS DIFFERENCE COMPENSATOR 审中-公开

    公开(公告)号：US20230176284A1

    公开(公告)日：2023-06-08

    申请号：US17919327

    申请日：2020-04-24

    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

    Inventor： Yoko YAMASHITA ,  Takashi MATSUI ,  Kazuhide NAKAJIMA

    IPC: G02B6/14 ,  G02B6/122

    CPC classification number: G02B6/14 ,  G02B6/1228

    Abstract: A mode loss difference compensator of the present disclosure includes a main waveguide configured to allow propagation of N or more modes (where N is an integer of 3 or more), a first auxiliary waveguide having, at one end thereof, a first coupling portion configured to mode-convert an LP0n mode (where n is an integer of 2 or more) propagating in the main waveguide into a fundamental mode in the first auxiliary waveguide and transfer the fundamental mode from the main waveguide to the first auxiliary waveguide and having, at the other end thereof, a second coupling portion configured to mode-convert the fundamental mode propagating in the first auxiliary waveguide into the LP0n mode (where n is an integer of 2 or more) in the main waveguide and transfer the LP0n mode from the first auxiliary waveguide to the main waveguide, and a second auxiliary waveguide having, at one end thereof, a third coupling portion configured to convert a higher-order mode, other than any LP0n mode (where n is an integer of 2 or more), propagating in the main waveguide into a fundamental mode in the second auxiliary waveguide and transfer the fundamental mode from the main waveguide to the second auxiliary waveguide and having, at the other end thereof, a terminal end portion configured to eliminate the fundamental mode propagating in the second auxiliary waveguide from the second auxiliary waveguide, wherein the main waveguide includes a loss imparting portion configured to impart a loss to a fundamental mode propagating in the main waveguide between the first and second coupling portions.

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