Monolithic piezoelectric control of soliton microcombs

We demonstrate piezoelectric actuators monolithically integrated on ultralow-loss Si3N4 waveguides. Varying the voltage applied on the actuator allows microresonator tuning, and to initiate, switch, stabilize and tightly phase lock the single soliton microcomb. This new capability allows to build a compact soliton-based paralell LiDAR.