Modulation instability at high frequencies has been demonstrated in the normal dispersion regime by use of a photonic crystal fiber. This fiber-optic parametric generator provides efficient conversion of red pump light into blue and near-infrared light. Scalar modulation instability (MI), which leads to the breakup of an intense continuous-wave beam, is the simplest form of MI that can occur in optical fibers, involving only one polarization state of the light field. A conventional analysis of this phenome-non is by means of the one-dimensional nonlinear Schrödinger equation (NLSE), which leads to the widely accepted result that scalar MI occurs only in the anomalous dispersion regime of a single-mode optical f iber.
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