Rayleigh backscattering fiber optic rotation sensor based on combined two-ring-resonator

The combined two-ring-resonator schemes of the fiber optic rotation sensor are developed and demonstrated. The two-ring topology structure has been classified into two kinds: two-ring in series and in parallel. The cavity lengths L1 and L2 of the two-ring-resonator are chosen as 623 m and 1260 m, respectively. A theoretical model of the two-ring Rayleigh backscattering fiber optic rotation sensor including the Sagnac effect is established. The experimental results are in agreement with the theoretical prediction.