Higher-order anti-PT-symmetric self-injection locking micro-resonator optical gyroscope

Abstract

The higher-order anti-parity-time(APT)-symmetric self-injection locking micro-resonator optical gyroscope sensing mechanism is proposed. In the third-order APT-symmetric exceptional points(EP) gyroscope system, the frequency splitting induced by rotation is directly proportional to the cube root of the rotation rate. Furthermore, this solution exhibits real frequency splitting, the half-width at half-maximum(FHWM) and spectral power of the resonance curve remain unchanged. Compared with the second-order PT-symmetric optical gyroscope, the proposed rotation sensing mechanism reduces the detection complexity and enhances the beat frequency detection accuracy, resulting in a sensitivity increase of at least one order of magnitude when the speed to be measured is less than 105 °/h. Moreover, the structure incorporates the self-injection locking signal processing method, thereby streamlining the system architecture and reducing both the cost and volume of the gyroscope. This sensing mechanism further improves the on-chip ultra-sensitive rotation sensing scheme and will contribute to the design of quantum gyroscopes.