Our main research topics are photonic integrated circuits, nonlinear optics and quantum optics in microresonators. We mainly work with ultrahigh-Q microresonators that can store light for long times. In these resonators, light can circulate for up to a million round-trips, which leads to a very strong power enhancement that enables nonlinear optics at extremely low threshold powers. One research direction in our group is the generation and control of optical frequency combs in photonic microresonators. At high power levels we study soliton dynamics of these comb states, while at low power we study the quantum properties of generated photons. In addition, we study the interaction of counterpropagating light in optical circuits and corresponding applications, for example in nonlinear optical isolators, optical gyroscopes, Kerr polarization controllers and optical memories.

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