Abstract
Backreflection noise is one kind of main optical error in the resonant micro-optic gyroscope (RMOG). Resonance characteristics of backreflection noise in a RMOG is analyzed theoretically. Part of the backreflection noise can not be eliminated by using the traditional phase modulation techniques. This part of backreflection brings a nonzero bias to the output of RMOG due to the asymmetry of resonance curve. Degradation of gyro’s linearity is induced because this part’s transfer curve has two notches with separation proportional to the Sagnac phase shift when the RMOG is rotating. It’s recommended to set the length of straight waveguide to be half the ring length.
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