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Phased-Locked Two-Color Single Soliton Microcombs in Dispersion-Engineered Si3N4 Resonators



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


We propose and theoretically investigate a dispersion-engineered 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 sech^2 envelope, with the two windows phase-locked to each other via Cherenkov radiation. The first spectral window is centered around 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.
Optics Letters


Moille, G. , Li, Q. , Kim, S. , Westly, D. and Srinivasan, K. (2018), Phased-Locked Two-Color Single Soliton Microcombs in Dispersion-Engineered Si3N4 Resonators, Optics Letters, [online],, (Accessed June 21, 2024)


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Created June 14, 2018, Updated October 12, 2021