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arXiv · 1404.2865

Mode interaction aided excitation of dark solitons in microresonators constructed of normal dispersion waveguides

Xiaoxiao Xue·Yi Xuan·Yang Liu·Pei-Hsun Wang·Steven Chen·Jian Wang·Dan E. Leaird·Minghao Qi·Andrew M. Weiner
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Abstract

Kerr frequency combs from microresonators are now extensively investigated as a potentially portable technology for a variety of applications. Most studies employ anomalous dispersion microresonators that support modulational instability for comb initiation, and mode-locking transitions resulting in coherent bright soliton-like pulse generation have been reported. However, some experiments show comb generation in normal dispersion microresonators; simulations suggest the formation of dark pulse temporal profiles. Excitation of dark pulse solutions is difficult due to the lack of modulational instability in the effective blue-detuned pumping region; an excitation pathway has been demonstrated neither in experiment nor in simulation. Here we report experiments in which dark pulse combs are formed by mode-interaction-aided excitation; for the first time, a mode-locking transition is observed in the normal dispersion regime. The excitation pathway proposed is also supported by simulations.

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Xiaoxiao Xue, Yi Xuan, Yang Liu, Pei-Hsun Wang, Steven Chen, Jian Wang, Dan E. Leaird, Minghao Qi, Andrew M. Weiner. 2015-08-17. Mode interaction aided excitation of dark solitons in microresonators constructed of normal dispersion waveguides. https://doi.org/10.1038/nphoton.2015.137

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