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Si3N4 microring design parameters on SiO2 substrate with air top cladding. (a) Schematic of the trench-ring geometry, producing from a continuous wave (CW) input a two-color single soliton state. The spectrum and temporal waveform associated with the input and output are indicated above the schematic. (b) Top view, and (c) cross section view. Blue corresponds to Si3N4, the hatched part to the etched trench.
