AUTHOR=Wang Xinyu , Xie Peng , Wang Yang , Wang Weiqiang , Wang Leiran , Little Brent E. , Chu Sai Tak , Zhao Wei , Zhang Wenfu 

TITLE=Experimental Demonstration of Self-Oscillation Microcomb in a Mode-Splitting Microresonator

JOURNAL=Frontiers in Physics

VOLUME=Volume 10 - 2022

YEAR=2022

URL=https://www.frontiersin.org/journals/physics/articles/10.3389/fphy.2022.908141

DOI=10.3389/fphy.2022.908141

ISSN=2296-424X

ABSTRACT=Self-oscillation and bifurcation as many body dynamics solutions in a high-Q microresonator have induced in substantial interest in nonlinear optics and ultrafast science. Strong mode coupling between clockwise (CW) wave and counterclockwise (CCW) wave induce mode-splitting and optical self-oscillation in the optical cavity. In this letter, we experimentally demonstrate the self-oscillation microcomb formation in a microresonator with strong backward Rayleigh scattering. When a pump laser sweeps across a resonance, both spontaneous symmetry breaking and self-oscillation phenomenon are observed. The breathing soliton and stable soliton state can switch to each other through carefully tuning the pump detuning. Our experiments provide a reliable scheme for breather soliton microcomb generation. Meanwhile, the rich physics process enhances the comprehension on nonlinear optics in a cavity.