We review recent progress in inducing and harnessing stimulated Brillouin scattering (SBS) in integrated photonic circuits. Exciting SBS in a chip-scale device is challenging due to the stringent requirements on materials and device geometry. We discuss these requirements, which include material parameters, such as optical refractive index and acoustic velocity, and device properties, such as acousto-optic confinement. Recent demonstrations of novel on-chip functionalities are discussed, including narrow-linewidth lasers, frequency combs, slow- and fast-light, microwave signal processing, Brillouin dynamic gratings, and nonreciprocal devices.
© 2014 OSA