We demonstrate comb generation with spacings of 80, 40, and 20 GHz using cascaded parametric oscillation in silicon-nitride spiral microresonators. Our measurements indicate that the comb linewidth is due to fluctuations in the pump power.
© 2012 OSA
A. R. Johnson, Y. Okawachi, J. S. Levy, J. Cardenas, K. Saha, M. Lipson, and A. Gaeta, "Broadband Parametric Frequency Combs with Sub-100-GHz Repetition Rates," in Conference on Lasers and Electro-Optics 2012, OSA Technical Digest (online) (Optical Society of America, 2012), paper CTh3A.4.
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