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      Permanent link:
      https://www.ias.ac.in/article/fulltext/pram/072/06/0939-0950

    • Keywords

       

      Femtosecond optical pulses; nonlinear media; third-order dispersion; self-steepening; stimulated Raman scattering.

    • Abstract

       

      We model the propagation of femtosecond pulses through optical fibres by a nonlinear Schrödinger (NLS) equation involving a perturbing term arising due to third-order dispersion in the medium. The perturbative effect of this higher-order dispersion causes the usual NLS soliton to emit a radiation field. As a result, the given initial pulse propagating through the fibre exhibits nonsolitonic behaviour. We make use of a variational method to demonstrate how an initial pulse by the interaction with the emitted radiation can evolve into a soliton. We also demonstrate that the effect of interaction between the initial pulse and radiation field can be accounted for by including, in the evolution equation, terms associated with self-steepening and stimulated Raman scattering that characterize the optical medium.

    • Author Affiliations

       

      Debabrata Pal1 S K Golam Ali1 B Talukdar1

      1. Department of Physics, Visva-Bharati University, Santiniketan 731 235, India
    • Dates

       
  • Pramana – Journal of Physics | News

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