Parameters analysis of triangular wave modulation in resonator micro optic gyro

Performance of resonator micro optic gyro (RMOG) is inevitably affected by modulation parameters. The influences on the RMOG by the frequency and amplitude of the modulation triangular wave have been deeply analyzed. Theoretical analysis and Matlab simulation results show that the modulation amplitude should be set to 15.44 V to obtain better carrier suppression ratio (CSR). The outputs of photodetectors are calculated by Matlab and the modulation frequency should be set to 1 MHz to improve signal to noise ratio (SNR). Then the experimental setup is established and the related measurements are performed. The test results are in good agreement with the analytical simulation. Moreover, the bias stability of the RMOG is improved from 0.39 ()/s to 0.18 ()/s (10 s integration time) over 600 s with the optimized modulation parameters. For other modulation techniques, such as sine wave phase modulation technique, the modulation parameters can also be optimized by analyzing the CSR and SNR to improve the bias stability of the RMOG.