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