0000000000071548

AUTHOR

Frederic Chaussard

Characterisation and Mitigation of Self-Phase Modulation in Optical Fibres

International audience

research product

Simple model of self-phase modulation spectral patterns in optical fibres

Self-phase modulation (SPM) has been extensively studied for several decades in optical fibers. This phenomenon manifests itself by a change of the frequency spectrum of a pulse, owing to the nonlinear index variation that follows the temporal evolution of the pulse. In the general case, the spectrum of the transmitted pulse cannot be calculated analytically and only approximate or rms expressions giving the bandwidth of the transmitted spectrum are used. In this paper, we present a novel theoretical treatment of SPM based on a spectral interference model. We show that a two-wave interference process is sufficient to describe the main features of the SPM-broadened spectra of initially Fouri…

research product

Dualité temps-espace dans la propagation de la lumière

National audience; L’optique ondulatoire est souvent enseignée à travers ses manifestations dans le domaine spatial : motifs d’interférence, figures de diffraction, propagation en espace libre... En exploitant le domaine de Fourier, il est possible de dresser une analogie formelle entre la diffraction 1D de la lumière et la dispersion subie par impulsion ultrabrève. Cela a permis la transposition de solutions connues de l’optique spatiale à l’optique temporelle. Ainsi, régie par une phase quadratique, la lentille temporelle copie la lentille traditionnelle et a permis ainsi d’imaginer expérimentalement de nouvelles approches de caractérisation d’impulsions ultrabrèves.Dans cette contributio…

research product