Abstract
Amongst numerous research results published about supercontinuum generation in photonic crystal fibers, one can find several experimental and numerical observations of the remarkable effect of radiation trapping by solitons across the zero dispersion point, see, e.g., [1,2], This effect is paramount for understanding and control of the width of the supercontinua spectra obtained through the soliton fission process [1,2], Indeed, it is known [1,2], that the radiation at the blue edge is dragged further to the blue by the red shifting Raman solitons on the red edge of the spectrum. The entire spectrum is continuously stretched by this mechanism. XFROG diagrams showing correlated soliton and radiation pairs for a typical PCF with positively sloped group velocity dispersion are illustrated in Figure A. Paradox of this effect is in the fact that a standard sech soliton existing in the range of the anomalous dispersion at the red edge creates (by means of the cross-phase modulation) an effective repulsive potential for the normally dispersing radiation at the blue edge. Therefore the above described and very robust trapping effect should not be expected to happen. Note that the radiation appears to be trapped in the fonn of the bright and practically non-dispersive wave packets, so that one can exclude possible presence of the bright-dark soliton pairs (known to exist across the zero dispersion point). In our recent paper [2] we have revealed the physics behind the emergence of this radiation in the first place. It has been demonstrated, that the radiation appears due to four-wave mixing (FWM) between the solitons and the dispersive waves. In the course of further propagation the sloped dispersion and the soliton Raman shift lead to the cascade of the FWM events resulting in merging of the frequencies of the dispersive pump and dispersive signal so that they can not be distinguished neither in time nor in frequency domains (so called intrapulse FWM) [2].
© 2007 IEEE
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