Lingfei Hong

Effect of phase modulation nonlinearity in resonator micro-optic gyro

Serrodyne phase modulation is one of the most widely used frequency shifting techniques in a resonator micro-optic gyro (RMOG). However, to achieve high gyro performance, extraordinary linearity of the serrodyne waveform is critically required. In this paper, compact RMOG with an ultrashort micro-optic resonator using analog triangle phase modulation is proposed. Theoretical analysis on the effects of second and third order nonlinearity of the modulation waveform, along with quantitative calculation of errors induced by the modulating nonlinearity, is presented. Performances of the established RMOG system are experimentally demonstrated, with nonlinearity measurement of the generated and applied triangle waveform. The proposed scheme shows great capability in near-linear waveform generation with quite simple electrical elements.

Limitation of rotation sensing in IORG by Rayleigh backscattering noise

Rayleigh backscattering noise (RBN) in integrated optical resonance gyroscope (IORG) is theoretically and experimentally researched. The SiO2 waveguide resonator performance degradation of IORG due to RBN is analyzed firstly, and then the nonlinear output of IORG caused by RBN is simulated. Finally, opposite slope triangle wave modulation is employed for suppressing the RBN in IORG. Experimental results show that the bias stability of IORG is effectively improved from 45.144°/s to 0.71708°/s, representing the effectiveness of the countermeasure.