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

André C. A. Siqueira1,*, Edilson L. Falcão-Filho1, Boris A. Malomed2,3, and Cid B. de Araújo1

  • 1Departamento de Física, Universidade Federal de Pernambuco, 50670-901 Recife, Pernambuco, Brazil
  • 2Department of Physical Electronics, School of Electrical Engineering, Faculty of Engineering, Tel Aviv University, Tel Aviv 69978, Israel
  • 3Instituto de Alta Investigación, Universidad de Tarapacá, Casilla 7D, 100007 Arica, Chile

  • *Corresponding author: andrechaves.physics@gmail.com
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Phys. Rev. A 107, 063519 – Published 30 June, 2023

DOI: https://doi.org/10.1103/PhysRevA.107.063519

Abstract

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 group-velocity 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 Schrödinger 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.

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Phys. Rev. A 107, 063519– Published 30 June, 2023
  • Received 5 February 2023
  • Accepted 2 June 2023
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