We perform an experimental time-domain mapping of nonlinear pulse propagation through a two-dimensional photonic-crystal waveguide. Our optical gating method allows for the complete reconstruction of the peculiar propagation behavior in this highly dispersive structure. Temporal soliton formation is accompanied by fast time-scale dynamics within the picosecond pulse regime. For high signal powers, the photonic waveguide band is modified, leading to an acceleration of the propagated pulse.
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