Generation of multiple ultrashort temporal solitons in a third-order nonlinear composite medium with self-focusing and self-defocusing nonlinearities

Theoretical consideration of the propagation of femtosecond Gaussian pulses in a one-dimensional composite medium, consisting of alternating self-focusing and self-defocusing waveguide segments with normal groupvelocity dispersion, predicts the generation of trains of bright solitons when an optical pulse first propagates in the self-focusing segment, followed by the self-defocusing one. The multiple temporal compression process, based on this setting, offers a method for controllable generation of multiple ultrashort temporal solitons. Numerical solutions of the generalized nonlinear Schrodinger equation modeling this system demonstrate that the intrapulse Raman scattering plays a major role in the temporal and spectral dynamics. Collisions between ultrashort solitons with different central wavelengths are addressed too. The paper provides a procedure for producing controllable trains of ultrashort temporal solitons by incident optical pulses propagating in a composite medium.

Automated summary

Theoretical consideration and numerical simulation of femtosecond pulse propagation in a one-dimensional composite medium reveals the generation of bright soliton trains. The paper discusses the controllable production of ultrashort temporal solitons and addresses the role of intrapulse Raman scattering and collisions between solitons with different central wavelengths.