Dual-frequency and multi-linewidth laser based on self-injection locking for optical gyroscopes

Abstract

Diverse resonant optical gyroscopes (ROG) exhibit unique lasers requirements and the optimal method involves integrating multiple functions into a singular laser device. Here, we introduce a simple dual-frequency multi-linewidth laser configuration for resonant optical gyroscopes, which uses self-injection locking technology for frequency stabilization and linewidth narrowing, generating the first narrow linewidth laser beam. Then, based on self-injection locking technology, careful adjustment of the ring cavity length has been used to achieve the second laser with Brillouin frequency shift and further narrowing of laser linewidth. In addition, external phase modulation is performed at another light port by loading the radio frequency voltage signal onto the electro-optic phase modulator to achieve the purpose of spectral broadening, which is the third broad-spectrum laser. Finally, we have successfully applied the proposed dual-frequency multi-linewidth laser in both the narrow-linewidth laser-driven traditional ROG and the broadband laser-driven ROG. This work is of significant importance for improving the versatility of lasers, reducing the testing cost and size of gyroscope. Next, the focus of future work will translate the proposed laser design to integrated photonics.