Supercontinuum spectra generation in the single-mode optical fibre with concave dispersion profile

In this paper, a new method is proposed to generate broad supercontinuum(SC) spectra in the single-mode optical fibre with concave dispersionprofile. We numerically simulate pulse evolutions and discuss physicsmechanism in detail for SC spectrum generation in the optical fibre withconcave dispersion profile. Furthermore, general criteria are presented forspecifying the shape of SC spectrum by introducing normalized parameters,which are related to the fibres and the initial pump pulses. The resultsshow that the flat and broad SC spectra are indeed generated in our proposedoptical fibre.