The onset of supercontinuum generation in a photonic crystal fiber is investigated experimentally and numerically as a function of pump wavelength and intensity with 100-fs pulses. Soliton formation is found to be the determining factor in the initial step. The formation and behavior of a blueshifted, nonsolitonic component, emitted as the soliton evolves towards the stable regime, is investigated and the role of phase matching through higher-order dispersion is highlighted. Good agreement between experiments and simulations is obtained.
© 2003 Optical Society of America
(060.4370) Fiber optics and optical communications : Nonlinear optics, fibers
(060.7140) Fiber optics and optical communications : Ultrafast processes in fibers
(190.5530) Nonlinear optics : Pulse propagation and temporal solitons
(190.7220) Nonlinear optics : Upconversion
Karen Marie Hilligsøe, Henrik Nørgaard Paulsen, Jan Thøgersen, Søren Rud Keiding, and Jakob Juul Larsen, "Initial steps of supercontinuum generation in photonic crystal fibers," J. Opt. Soc. Am. B 20, 1887-1893 (2003)