Exceptional-point-enhanced Brillouin micro-optical gyroscope based on self-injection locking

We propose a novel exceptional point (EP)-enhanced Brillouin micro-optical gyroscope (BMOG) by using the self-injection locking technique which requires a small-size, low-cost and low-power distributed feedback (DFB) semiconductor laser instead of the narrow-linewidth-tunable laser in the traditional micro-optic gyroscopes. Self-injection locking technique simplifies the frequency locking mechanism and greatly reduces the cost and size of the laser, and the narrowed linewidth meets the needs of the gyroscope. Compared with other traditional micro-optic gyroscopes, boost in sensitivity of the angular velocity sensing is demonstrated with BMOG operating near an EP. This high-sensitivity, low-cost, low power and small-size BMOG scheme is potential for integration and engineering.