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Spectral broadening in an array of subwavelength silicon waveguides pumped with fs pulses is studied. Adjusting input pulse position, different spectral patterns are observed and explained using the resonant emission from temporal supermode solitons.
Time-domain measurements of dispersion- and nonlinearity-induced chirpings of femtosecond pulses in silicon-on-insulator nanowires reveal nonlinear dispersion compensation. Spectral measurements show pronounced dispersive wave emission by solitons.
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