Phased-locked two-color single soliton microcombs in dispersion-engineered Si3N4 resonators

Gregory Moille, Qing Li, Sangsik Kim, Daron Westly, Kartik Srinivasan

Research output: Contribution to journalArticlepeer-review

22 Scopus citations


We propose and theoretically investigate a dispersionengineered Si3N4 microring resonator, based on a cross section containing a partially-etched trench, that supports phase-locked, two-color soliton microcomb states. These soliton states consist of a single circulating intracavity pulse with a modulated envelope that sits on a continuous wave background. Such temporal waveforms produce a frequency comb whose spectrum is spread over two widely-spaced spectral windows, each exhibiting a squared hyperbolic secant envelope with the two windows phase-locked to each other via Cherenkov radiation. The first spectral window is centered near the 1550 nm pump, while the second spectral window is tailored based on straightforward geometric control, and can be centered as short as 750 nm and as long as 3000 nm. We numerically analyze the robustness of the design to parameter variation, and consider its implications to self-referencing and visible wavelength comb generation.

Original languageEnglish
Pages (from-to)2772-2775
Number of pages4
JournalOptics Letters
Issue number12
StatePublished - Jun 15 2018


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