Backscattering in an optical passive ring-resonator gyro: experiment

The experimental results of the resonance characteristics of the backscattering in an optical passive ring-resonator gyro (OPRG) are reported. This resonance has two peaks with a separation equal to the Sagnac phase shift when rotation is given. The experimental results are in good agreement with a theory that has already been presented. This phenomenon degrades the gyro linearity almost 10 percent in a high sensitivity OPRG with the frequency output. A method to eliminate this noise is proposed.