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As light propagates along a waveguide, a fraction of the field can bereflected by Rayleigh scatterers. In high-quality-factorwhispering-gallery-mode microresonators, this intrinsic backscattering isprimarily caused by either surface or bulk material imperfections. For severaltypes of microresonator-based experiments and applications, minimalbackscattering in the cavity is of critical importance, and thus, the abilityto suppress backscattering is essential. We demonstrate that the introductionof an additional scatterer into the near field of a high-quality-factormicroresonator can coherently suppress the amount of backscattering in themicroresonator by more than 30 dB. The method relies on controlling thescatterer position such that the intrinsic and scatterer-inducedbackpropagating fields destructively interfere. This technique is useful inmicroresonator applications where backscattering is currently limiting theperformance of devices, such as ring-laser gyroscopes and dual frequency combs,which both suffer from injection locking. Moreover, these findings are ofinterest for integrated photonic circuits in which back reflections couldnegatively impact the stability of laser sources or other components.

Coherent suppression of backscattering in optical microresonators