Ultra-High Stability Chip-Scale Optical Gyroscope

Broadband source-driven resonant micro-optic gyroscopes (RMOGs) based on multimode whispering-gallerymode (WGM) microcavities show strong potential for enabling compact, high-precision inertial sensing. In this paper, we investigate the reciprocity characteristics of a broadband source-driven RMOG employing a multimode microcavity. A Jones matrix model is developed to analyze the impact of polarization misalignment on detection accuracy, and an optimization strategy is proposed to maximize the system's demodulation slope through polarization angle alignment. Experimental results using a 28.5 mm-diameter WGM microcavity demonstrate a bias instability as low as 0.5°/h over 10 hours of continuous testing. To the best of our knowledge, this represents the lowest reported bias instability for WGMbased RMOGs, demonstrating the feasibility of ultra-high stability in chip-scale resonant optical gyroscopes.