Kerr-microresonator solitons from a chirped background
Optical frequency combs based on solitons in nonlinear microresonators open up new regimes for optical metrology and signal processing across a range of expanding and emerging applications. In this work, we advance these combs toward applications by demonstrating protected single-soliton formation and operation in a Kerr-nonlinear microresonator using a phase-modulated pump laser. Phase modulation gives rise to spatially/temporally varying effective loss and detuning parameters, leading to an operation regime in which multi-soliton degeneracy is lifted and a single soliton is the only observable behavior. We achieve direct, on-demand excitation of single solitons as indicated by reversal of the characteristic "soliton step." Phase modulation also enables precise, high bandwidth control of the soliton pulse train's properties, and we measure dynamics that agree closely with simulations. We show that the technique can be extended to high-repetition-frequency Kerr solitons through subharmonic phase modulation. These results will facilitate straightforward generation and control of Kerr-soliton microcombs for integrated photonics systems.
Additional Information© 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement. Received 5 July 2018; revised 18 September 2018; accepted 20 September 2018 (Doc. ID 337882); published 16 October 2018. Funding: National Aeronautics and Space Administration (NASA); National Institute of Standards and Technology (NIST); Defense Advanced Research Projects Agency (DARPA) (DODOS); National Science Foundation (NSF) (DGE 1144083); Air Force Office of Scientific Research (AFOSR) (FA9550-16-1-0016); RSNZ. We thank Su-Peng Yu and Hojoong Jung for comments on the manuscript, and Andrew Weiner for helpful discussions.
Published - optica-5-10-1304.pdf
Submitted - 1807.03323.pdf