Recent Advances in Stimulated Brillouin Scattering in Integrated Photonics

ABSTRACT On‐chip stimulated Brillouin scattering (SBS) technology has garnered attention in the field of integrated photonics due to its unique acousto–optic coupling characteristics and potential for all‐optical signal processing systems. By leveraging efficient Brillouin acousto–optic interactions, a variety of high‐performance on‐chip SBS‐based devices have been successfully demonstrated, including narrow‐linewidth lasers, low‐noise amplifiers, high‐precision gyroscopes, tunable filters, and optical isolators. In this review, we first summarize the physical mechanisms of SBS and the key methods for calculating gain characteristics on integrated optical platforms. We then discuss the implementation schemes of the Brillouin effect in different material platforms, along with their emerging applications in optical communications, quantum information, and other fields. Finally, we outline the current technological challenges and prospective research, which may provide insights into the design of next‐generation integrated acousto–optic devices.