An interferometric optical gyro (IOG) based on integrated devices are a promising alternative for miniaturized inertial sensors. However, improving their accuracy, which is determined by the sensing coil insertion loss, is crucial. In this work, an IOG is built using an integrated sensing coil produced from a 2.14-m-long SiO2 waveguide, the minimum bend radius and spacing of which are chosen to minimize the sensing coil insertion loss. The coil length is chosen by considering optimal detection limit constraints. Sinusoidal wave biasing modulation improves the system detection sensitivity. Finally, the IOG realizes the best yet reported bias drift of 7.32°/h.
We present here a general method for evaluating the steady-state frequency-tracking distortion in the digital Pound–Drever–Hall technique with modulation harmonic distortion. The theoretical tracking distortion model is established based on the multi-beam interference theory. The effects of the additional harmonic phase shift and the relative distortion ratio changes in the model are simulated by the Runge–Kutta method. Moreover, we demonstrate the steady-state frequency-tracking distortion caused by the modulation harmonic distortion in a resonant frequency tracking system with a 35 mm
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waveguide ring resonator. According to the measured and simulated results, we obtain the optimal modulation frequency and depth with minimal frequency-tracking distortion, which are 11.49 MHz and 3.96, respectively.
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