Spectra and Phases of Supercontinuum Pulses Generated in Tapered Fiber and Photonic-Crystal-Fiber with Low Dispersion

Recently, optical pulses propagating through a tapered fiber (TF) immersed in heavy water (D2O) or photonic crystal fi ber (PCF) of a special design were reported to yield a broad and fl at supercontinuum (SC) spectrum because the fi ber dispersion characteristics are of low dispersion around 1000 nm. This study was undertaken to investigate spectral intensities and phase distributions of SC pulses generated in low-dispersion fi bers. Results show that highly nonlinear PCF with group velocity dispersion (GVD) distributions having an extremum value and zero dispersion around 1000 nm is useful at short fiber length for applications in which the phase distribution is a concern.