Suppression of intrinsic backscattering in integrated optical resonators via acoustic pumping

We experimentally demonstrate on-chip backscattering suppression with acoustic pumping in integrated LiNbO 3 racetrack resonators. We show the recovery of the intrinsic linewidth(0.14GHz) of an optical mode from a Rayleigh-scattering induced doublet state(0.32GHz) with backreflection suppression.