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Theoretical consideration of the propagation of femtosecond-Gaussian pulsesin a 1D composite medium, consisting of alternating self-focusing (SF) andself-defocusing (SDF) waveguide segments with normal group-velocity dispersionpredicts the generation of trains of bright solitons when an optical pulsefirst propagates in the SF segment, followed by the SDF one. The multipletemporal compression (MTC) process, based on this setting, offers a method forcontrollable generation of multiple ultrashort temporal solitons. Numericalsolutions of the generalized nonlinear Schr\"{o}dinger equation modeling thissystem demonstrate that the intrapulse Raman scattering plays a major role inthe temporal and spectral dynamics. Collisions between ultrashort solitons withdifferent central wavelengths are addressed too. The paper provides, for thefirst time, a procedure for producing controllable trains of ultrashorttemporal solitons by incident optical pulses propagating in a composite medium.

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