Stéphane is involved with theoretical and experimental studies of fundamental nonlinear optical phenomena in optical fibers with the aim of investigating potential applications to telecommunications. During his PhD, he has focused on the study of the dynamics of passive nonlinear optical fiber resonators, investigating optical bistability, period-doubling instabilities and optical chaos, and several regimes of intracavity modulational instabilities [see publications 1-5]. This has led to the demonstration of a continuous-wave ultrahigh repetition rate laser source based on modulational instability and operating at more than 100 GHz [publication 9]. The structural simplicity of passive optical fiber cavities has also been used to investigate more fundamental nonlinear dynamics such as a competition between a dispersive and a convective transport mechanism. This latter aspect has been dramatically illustrated by the experimental demonstration of the inhibition of optical bistability in synchronously pumped nonlinear cavities in presence of a cavity synchronization mismatch smaller than 1% of the pump pulse width [publication 7].At the Applied Optics Center, Stéphane has started a new research activity dealing with nonlinear optical propagation in fibers. He is currently investigating white-light supercontinuum generation in photonic crystal fibers as well as some fundamental aspects of stimulated Raman scattering and its coupling with optical parametric processes.