Wavelength dependence of induced nonlinear effects in photonic crystal fibre

Summary form only given. In this paper, we report a systematic study of spectral effects at various wavelengths relative to the zero group velocity dispersion (GVD) point in the fibre. The fibres used in our experiments had core diameters of 1.6 /spl mu/m and 2.5 /spl mu/m corresponding to a zero GVD point at 680 nm and 790 nm, respectively. Light from a 10 fs Ti:sapphire laser, centred on 800 nm, was coupled into both of these fibres and the smaller core fibre produced a spectrum corresponding to a four-wave mixing peak in the visible portion of the spectrum and a soliton self-frequency-shifted spectral feature in the near infra-red. The larger core fibre produced an almost continuous spectrum.