The effect of thermal-induced noise on doubly-coupled-ring optical gyroscope sensor around exceptional point

We theoretically analyze the performance of gyroscope sensor near exceptional point (EP), consisting of two coupled micro-ring resonators. Distinct thermal behaviors, due to different gains in these two rings, could bring about an extra resonance shift between them, which places a great impact on EP sensor including its sensitivity, visibility and stability. Our simulations demonstrate that, such thermal-induced noise can be amplified around EP simultaneously as well as the frequency splitting generated from Sagnac effect we should detect, giving rise to the difficulty of sensing comparatively weak rotation-induced perturbations, and a limited detection range while utilizing the superiority of EP in such a gyroscope system. Our tolerance analysis in this paper may have a profound referential meaning to the future experimental works.