Direct-Coupled Large-Diameter Silica on Silicon Waveguide Ring Resonator Used in Microoptic Gyro

Abstract

A kind of direct-coupled large-diameter silica on silicon waveguide ring resonator used in microoptic gyro with 4 cm diameter was presented. An optical and electromechanical test platform was designed to investigate the performance of the ring resonator. The resonance curve, demodulation curve and three relative important resonator parameters were obtained. The free spectral range of the resonator, the full width at half maximum of the resonance curve and the finesse of the resonator, are 3 GHz, 73 MHz and 41, respectively. Open-loop experiments of resonator are set up using the acousto-optic frequency modulation spectroscopy technique. The output of MOG is investigated by the platform rotate and equivalent gyro rotate. The slope of the linear fit is about 3.154 mV/( /s) based on the À50$50 /s rotating rates and 0.330 mV/( /s) based on the À900$900 KHz equivalent frequency shift, respectively. The demodulation curve shows a strongly nonlinear and the linear approximation has a great limitation.