  We study Kerr frequency combs and dissipative Kerr solitons in silicon
photonic crystal coupled-cavity waveguides (CCW) with globally optimized
dispersion at telecom wavelengths. The corresponding threshold for comb
generation is found to explicitly depend on the main CCW figures of merit,
namely, mode volume, normal mode quality factor and slow-light group index. Our
analysis is carried out by solving the non-linear dynamics of the CCW Bloch
modes in presence of Kerr non-linearity and two-photon absorption. Our results
open the way to CCW comb generation via dispersion engineering and slow-light
enhancement.
