Polarization problem and countermeasures in passive/active resonator fiber optic gyros

Polarization problem and countermeasure in Resonator Fiber optic Gyros and Brillouin Fiber Optic Gyros are discussed. The Eigenstate of Polarization is introduced to express the behavior of the polarization in the fiber resonator. The polarization maintaining fiber resonator having 90 degree(s) rotation of the polarization axis at the splice and the single-polarization single-mode fiber resonator are discussed. Moreover, the way to realize a stable resonator using an ordinary single mode fiber is also presented.

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