Fig. 3: Ultra-broadband soliton spectral translation: geometric dependence.

Geometric dispersion impacts the location of the generated DWs, much like the case in singly pumped DKS devices. Here, microrings are pumped at 192 and 282 THz with a pump power of 200 and 250 mW respectively, for ring widths (RWs) from 1080 to 1125 nm. In each case, an ultra-broadband microcomb is generated in which the soliton comb teeth surrounding the primary pump are spectrally translated by the synthesis pump. Single-pump DKS states are also showcased for each RW, where thermal stability was obtained through cross-polarized counterclockwise pumping at 305 THz. The solid black lines represent the expected single soliton spectra calculated through the dual-pumped generalized LLE and single-pump LLE for their corresponding counterpart experiments. The dashed lines represent the microcomb envelope prediction using the synthetic dispersion and single-pump LLE. The light gray solid lines are visual guides showcasing the shift of the DWs with RW. 0 dB is referenced to 1 mW, i.e., dBm.