Fig. 7: Mixed piston—shock tube problem.

Transition from DSW-c-DSW to DSW-per-DSW in the asymmetric case, with fixed Δf = 9.7 GHz and additional jump in power with nominal extinction ratio P_R/P_L = 0.15: (a) spectrogram of the input; (b) profile of input power jump; (c, d) output power profiles: (c) P₀ = 240 mW (u₀ = 0.94), below threshold; (d) P₀ = 90 mW (u₀ = 1.52), above threshold. e, f Output profiles obtained from numerical simulation of the NLSE (1). The vertical dashed lines stand for the vacuum point of the R-DSW (red), and the edge velocities of the DSWs (orange and cyan for linear edges, blue and purple for soliton or inner edges). In (e) the horizontal green dashed line stands for ρ_iP₀.