Dynamics of High Peak Power Pulses near 1.9 μm in a Standard Single-mode Telecom Fiber

The higher-order solitons are the soliton pulses with the energy higher than that of the fundamental soliton. Although the higher-order solitons' temporal and spectral shapes are not constant, such pulses reproduce their shapes after a soliton period. Previous research assumed that higher-order solitons and high peak power pulses could be obtained in femtosecond Tm-doped all-fiber lasers. For many of these works, the higher-order dispersion and nonlinear effects lead to a pulse break up and higher-order solitons are not able to reproduce their shape during the propagation in the fiber. Such effects as stimulated Raman scattering, self-steepening and higher-order dispersion appear in the cases of a propagation of high energy pulses and can lead not only to a spectral broadening, but also to a soliton fission. That is why it is important to model pulse dynamics in the external fiber and carefully conduct the measurements of the pulse parameters, especially autocorrelation trace and spectrum, while registration of higher-order solitons. In this work, we study the propagation of higher-order solitons assuming the presence of higher-order effects and their absence near 1.9 mu m in the SMF-28 fiber, as it's a common waveguide for pulse parameter measurements.