Interaction between optical fields and their conjugates in nonlinear media

Matteo Conforti, Andrea Marini, Truong X Tran, Daniele Franco Angelo Faccio, Fabio Biancalana*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

38 Citations (Scopus)
246 Downloads (Pure)


Motivated by recent experimental results, we demonstrate that the ubiquitous pulse propagation equation based on a single generalized nonlinear Schrodinger equation is incomplete and inadequate to explain the formation of the so called negative-frequency resonant radiation emitted by optical solitons. The origin of this deficiency is due to the absence of a peculiar nonlinear coupling between the positive and negative frequency components of the pulse spectrum during propagation, a feature that the slowly-varying envelope approximation is unable to capture. We therefore introduce a conceptually new model, based on the envelope of the analytic signal, that takes into account the full spectral dynamics of all frequency components, is prone to analytical treatment and retains the simulation efficiency of the nonlinear Schrodinger equation. We use our new equation to derive from first principles the phase-matching condition of the negative-frequency resonant radiation observed in previously reported experiments. (C) 2013 Optical Society of America

Original languageEnglish
Pages (from-to)31239-31252
Number of pages14
JournalOptics Express
Issue number25
Publication statusPublished - 16 Dec 2013




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