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Switching dynamics of dark-pulse Kerr comb states in optical microresonators

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posted on 2023-11-30, 19:06 authored by Elham Nazemosadat, Attila Fülöp, Óskar B. Helgason, Pei-Hsun Wang, Yi Xuan, Dan E. Leaird, Minghao Qi, Enrique Silvestre, Andrew M. Weiner, Victor Torres-Company
Dissipative Kerr solitons are localized structures that exist in optical microresonators. They lead to the formation of microcombs --- chip-scale frequency combs that could facilitate precision frequency synthesis and metrology by capitalizing on advances in silicon photonics. Previous demonstrations have mainly focused on anomalous dispersion microresonators. Notwithstanding, localized structures also exist in the normal dispersion regime in the form of circulating dark pulses, but their physical dynamics is far from being understood. Here, we report the discovery of reversible switching between coherent dark-pulse Kerr combs, whereby distinct states can be accessed deterministically. Furthermore, we reveal that the formation of dark-pulse Kerr combs is associated with the appearance of a new resonance, a feature that has never been observed for dark-pulses and is ascribed to soliton behavior. These results contribute to understanding the nonlinear physics in few-mode microresonators and provide insight into the generation of microcombs with high conversion efficiency.

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