Fig. 2. Existence of a DKS regime with effectively red-detuned soliton dynamics.

a Comparison of experimental and theoretical pump power transmission and Kerr comb power evolution as a function of pump detuning. In this measurement, the launched pump power is 1.25 W. Good agreements are achieved between measurement and theory, especially for the inverse negative-slope comb power stairs. b Numerically mapped DKS existence range with identified detuning of the Kerr comb, as determined by the ratio ΔP_comb/Δδ. The lower panel gives two examples of an increasing (0.40 W) and diminishing (0.20 W) soliton regime. L1 and L2 (H1 and H2) denote two soliton pulses extracted from the DKS energy curve generated for a pump power of 0.2 W (0.4 W); the corresponding detunings are listed in c. c Close-up soliton waveform evolution versus pump detuning in the increasing (upper) and diminishing (lower) soliton regimes