Self-trapping and switching of solitonic pulses in mismatched dual-core highly nonlinear fibers

Viet Hung Nguyen*, Le Xuan The Tai, Mattia Longobucco, Ryszard Buczyński, Ignac Bugár, Ignas Astrauskas, Audrius Pugžlys, Andrius Baltuška, Boris Malomed, Marek Trippenbach

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


We investigate experimentally and theoretically effects of the inter-core propagation mismatch on nonlinear switching in dual-core high-index-contrast soft-glass optical fibers. Incident femtosecond pulses of various energy are fed into a single (“straight”) core, to identify transitions between different dynamical regimes, viz., inter-core oscillations, self-trapping in the cross core, and retaining the pulse in the straight core. The transfer between channels, which has solitonic character, is controlled by the pulse's energy. A model based on the system of coupled nonlinear Schrödinger equations reveals the effect of the mismatch parameter and pulse duration on the diagram of the various energy dependent dynamical regimes. Optimal values of the mismatch and pulse width, which ensure stable performance of the nonlinear switching, are identified. The theoretical predictions are in agreement with experimental findings.

Original languageEnglish
Article number113045
JournalChaos, Solitons and Fractals
StatePublished - Feb 2023


  • All-optical switching
  • Asymmetric coupler
  • Mismatched dual-core optical fibers
  • Nonlinear fiber optics
  • Soft glass optical fibers


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