Abstract

Interactions between supercontinuum (SC) light pulses, produced by the propagation of rapidly sequenced picosecond pump laser pulses along a photonic crystal fiber, result in spectral broadening, which we attribute to interpulse soliton collisions. This phenomenon was measured experimentally, following our observation of spectral broadening in numerical simulations that exhibit so-called “pulse wraparound” or “temporal aliasing.” This occurs in simulations with narrow time grids: as early parts of the SC pulse leave the computational time domain, they “reenter” at the beginning and so interact with later parts of the evolving SC pulse. We show that this provides an effective model to predict the experimentally observed spectral changes.

© 2010 Optical Society of America

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