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International Journal of Optics
Volume 2011 (2011), Article ID 374581, 6 pages
http://dx.doi.org/10.1155/2011/374581
Research Article

Nonlinear Phenomena of Ultra-Wide-Band Radiation in a Photonic Crystal Fibre

Cirta'Com laboratory, Engineering School of Communication of Tunis (Sup'Com), University of Carthage, Ghazala Technopark, Ariana 2083, Tunisia

Received 22 May 2011; Revised 2 September 2011; Accepted 7 September 2011

Academic Editor: Wojtek J. Bock

Copyright © 2011 Rim Cherif and Mourad Zghal. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

We report the results of a numerical and experimental analysis of femtosecond pulse propagation in a highly nonlinear photonic crystal fibre (PCF). The propagation of ultrashort pulses in PCF is studied taking into account the effects of dispersion, self-phase modulation, stimulated Raman scattering, and self-steepening. The interaction between linear and nonlinear effects is investigated in order to better understand the interplay of these effects leading to the supercontinuum generation. The initial stage of an ultra-wide-band supercontinuum generation under femtosecond pumping is pointed out. Details about the expansion of the blue and red sides of the supercontinuum due to transfer of energy to dispersive waves are revealed and experimentally confirmed. Our experimental results are compared to numerical solution of the nonlinear Schrödinger equation. Good agreement is found.