Abstract

High-Q silicon nitride (SiN) microresonators enable optical Kerr frequency comb generation on a photonic chip and have recently been shown to support fully coherent combs based on temporal dissipative Kerr soliton formation. For bright soliton formation, it is necessary to operate SiN waveguides in the multimode regime in order to produce waveguide induced anomalous group velocity dispersion. However, this regime can lead to local disturbances of the dispersion due to avoided crossings caused by coupling between different mode families and, therefore, prevent the soliton formation. Here, we demonstrate that a single-mode “filtering” section inside high-Q resonators enables efficiently suppression of avoided crossings, while preserving high quality factors (Q106). We verify the approach by demonstrating single soliton formation in SiN resonators with a filtering section.

© 2016 Optical Society of America

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