Investigation on generalized analytical solution of similariton chirp in different tapered DDF and NIF

摘要

This paper firstly investigates the solution of similariton chirp in a dispersion-decreasing fiber (DDF) and a nonlinearity increasing fiber (NIF) with different tapered profile. Based on the symmetry reduction technology and discrete variable method, a generalized analytical solution of the chirp for arbitrary tapered fiber is obtained and proved to be coincident with the numerical solution by simulation. The broadening factor is further studied to analyze the generation and compression characteristic of similaritons. We find out that the similaritons generated by DDF are more conducive to generate high-quality ultra-short output pulse than that generated by NEF with the same tapered profile. Finally, the optimum output ultrashort pulse with a maximum output power 382.31 W and a FWHM of 92.9 fs, and that with a maximum output power 319.63 W and a FWHM of 99.5 fs are achieved by compressing similaritons generated in hyperbolic tapered DDF and NIF respectively.