  Bright-soliton frequency comb generation in a thin-film silicon nitride (SiN)
microresonator at optical telecommunication wavelengths is numerically
demonstrated using our recently developed approach for dispersion-engineering
by virtue of coupling-dispersion between two coupled microresonators. By
coupling two identical resonators through an asymmetric Mach-Zehnder structure,
sinusoidal splitting of the resonance frequencies can be achieved. This enables
the engineering of the dispersion of the resulting modes of the coupled
structure. Using this approach, anomalous dispersion of the resonant modes can
be achieved at the pumping wavelength (which is selected to be the optical
telecommunication wavelength, i.e., 1.55 $\mu m$) to enable Kerr-comb
generation. In addition, by utilizing soliton-induced Cherenkov radiation in
the coupled-resonator structure, we can increase the bandwidth of the resulting
Kerr-comb signal.
