Method of reducing polarization fluctuation inducing drift in resonator fiber optic gyro
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United States of America Patent
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Nov 4, 2003
Grant Date -
May 2, 2002
app pub date -
Aug 7, 2001
filing date -
Aug 10, 2000
priority date (Note) -
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Abstract
There is provided a method of generating no error in the output of a resonator fiber optic gyro even when the polarization dependency loss is present in a ring resonator of the resonator fiber optic gyro. The relationship between .DELTA.L and .DELTA..beta. is set to satisfy the formula .DELTA..beta..DELTA.L=.pi.+2n.pi. [radian] (n: integer), or .DELTA..beta..DELTA.L is close to the value obtained from the formula, where .DELTA.L is defined as the difference between the lengths L.sub.1 and L.sub.2 of two portions of a waveguide divided by a coupler and a polarization-rotating point in the ring resonator, and .DELTA..beta. is defined as the difference in propagation constant of two axes of polarization having the waveguide. .DELTA.L is set so that the error induced by the polarization fluctuation is minimized. Even when the polarization dependency loss is present in the coupler or the like, the ring resonator itself generates no errors thereby, and the error of the gyro output induced by the polarization fluctuation can be minimized in the resonator fiber optic gyro.
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