Fig. 5

Simulation of the FC front interaction with CW probe wave packets via ray tracing. a Wave packets average power spectrum for 6 µW average power of the CW probe at 1531.5 nm, rising time of the front of 6 ps, and initial band shift \(\Delta \omega _{{\mathrm{shift}}}\) of 0.12 THz. Other parameters are listed in the Supplementary Note 6. b The trajectories of the probe wave packets with respect to the front velocity. The two vertical orange lines represent the extent of the index front with a rise time of 6 ps, while the shading represents the refractive index front as it exponentially decays during propagation inside the waveguide. Solid black lines represent those wave packets that undergo complete transitions, while the dashed lines depict the wave packets which only undergo incomplete transitions