  We numerically investigate the influence of high-order dispersion on both
temporal and spectral characterizations of microresonator-based optical
frequency combs. The moment method is utilized to study the temporal dynamics
of intracavity solitons. The theoretical and numerical results indicate the
temporal shifts are induced by high-odd-order dispersion rather than
high-even-order dispersion. The role of high-order dispersion on the frequency
comb envelopes is carefully elucidated through analyzing the intracavity
Cherenkov radiations. We further demonstrate that the spectra envelope of an
ultrabroadband optical frequency comb can be engineered by using dispersion
profiles with multiple zero dispersion wavelengths.
