All Optical Switching in Non Linear Medium

Abstract

We studied spectral switching in nonlinear media. A soliton pulse is incident on the aperture after travelling through a nonlinear media. The diffraction through the aperture leads to spectral anomalies and eventually switching at zero intensity points (which are also phase singular points) in the diffraction pattern. It is shown that for a change in the nonlinear medium there is also change in width of the soliton pulse before it incident on aperture, hence spectral switching changes. The role of positive and negative group velocity dispersion is found to have significant consequences in spectral switching. The role of loss on spectral switching is investigated to realize the case for a practical dissipative system. Using super-Gaussian pulse, the effect of pulse shape on spectral switching is demonstrated. We have shown that spectral switching can also be controlled by relative phase between two interacting soliton pulses.