Parametric instabilities and vector solitons in composite PCF with zero phase birefringence and nonzero group birefringence

International audience

Quasi-phase-matched third harmonic generation in optical fibers using refractive-index gratings

International audience; The purpose of this work is to demonstrate the quasi-phase-matching of third harmonic generation process in optical fibers using refractive-index gratings. We compare conversion efficiency calculated with analytical coupled modes theory and numerical approach employing system of coupled generalized nonlinear Schrödinger equation. Moreover, we show that introducing the phase matching condition that takes into account the nonlinear contribution to propagation constants significantly increases the conversion efficiency by several orders of magnitude. Finally we optimize the grating constant to maximize conversion efficiency.

Propagation non-linéaire d'impulsions femtosecondes dans une fibre optique à bande interdite à cœur solide

National audience; Nous décrivons une étude expérimentale et numérique de l'évolution non-linéaire d'impulsions ultrabrèves se propageant dans une fibre optique à bande interdite à coeur solide. Suivant le mécanisme de guidage employé, des dynamiques significativement différentes sont mises en évidence.

Third harmonic generation in optical fibers with long period grating