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    FIBER OPTIC GYROSCOPE
    2.
    发明公开
    FIBER OPTIC GYROSCOPE 审中-公开

    公开(公告)号：EP4296617A1

    公开(公告)日：2023-12-27

    申请号：EP23171694.5

    申请日：2023-05-04

    申请人： Japan Aviation Electronics Industry, Limited

    发明人： OHNO, Aritaka ,  NAKAHARA, Takashi ,  MIYAMA, Taro

    IPC分类号： G01C19/72

    摘要： Totally six polarization-maintaining optical fibers having the same beat length are arranged at both ends of a single-mode optical fiber and both ends of a single-mode optical fiber coil, respectively. An angle between a principal axis of polarization in a first polarization-maintaining optical fiber and a plane of polarization of linearly polarized light from a light source is 45 degrees. The optical length of each of the six polarization-maintaining optical fibers is larger than a coherent length of the linearly polarized light from the light source. The total of the optical lengths of the six polarization-maintaining optical fibers into which polarization rotation in the process of passing through the single-mode optical fibers is factored is larger than the coherent length of the linearly polarized light from the light source.

    FIBER OPTIC GYROSCOPE WITH OPTICAL GATING FOR SPIKE SUPPRESSION
    10.
    发明公开
    FIBER OPTIC GYROSCOPE WITH OPTICAL GATING FOR SPIKE SUPPRESSION 审中-公开

    公开(公告)号：EP3848671A3

    公开(公告)日：2021-09-15

    申请号：EP21150802.3

    申请日：2021-01-08

    申请人： The Board of Trustees of the Leland Stanford Junior University

    发明人： DIGONNET, Michel J.F. ,  WHEELER, Jonathan M

    IPC分类号： G01C19/72

    摘要： A fiber optic gyroscope includes an optical fiber coil, at least one optical circuit, and at least one optical gate. The at least one optical circuit is configured to receive input optical signals generated by at least one optical source, to split each input optical signal into first and second optical signals, to phase modulate one or both of the first and second optical signals, to transmit the first and second optical signals to the optical fiber coil such that the first and second optical signals counterpropagate through the optical fiber coil, to receive the first and second optical signals after counterpropagating through the optical fiber coil, to combine the first and second optical signals after counterpropagating through the optical fiber coil, and to transmit the combined first and second optical signals to at least one photodetector. The at least one optical gate is configured to controllably time modulate the input optical signals and/or the first and second optical signals prior to being combined, said time modulating synchronized with said phase modulating.