Soliton self-frequency shift effects in photonic crystal fibre

Summary form only given. In this paper we discuss operation in a regime where well-defined near-infrared output spectra are generated at red-shifted wavelengths up to 450 nm longer than the input with strong depletion at the original pump wavelength of 810 nm. We attribute the effect to the soliton self-frequency shift in which Raman self-pumping of the soliton continuously transfers energy from shorter to longer wavelengths, so causing a redshift of the pulse centre wavelength. We studied the fibre output for input pulses of varying chirp (measured using SHG-FROG) and recorded the output spectrally and with autocorrelation and cross-correlation techniques.