Le scooter pour les jeunes adolescents : entre représentations sociales et pratiques risquées

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Exploratory approach to teenage moped and light motorcycle driving : between risk-taking and safety.

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The social representation of the moped among teenage boys: between transgressive behavior and social integration

A moped user’s risk of being killed on the road is much higher than that of a motorist. If numerous studies have been performed for bikers, much rarer are works dealing with moped users, who however represent a population of vulnerable users. Compared with bikers and other types of road users, this population of low cylinder users has the particularity of being made up of a majority of teenagers, that is, riders with little experience, little training and the particular problems linked with this age group. This qualitative study proposes to investigate the social representation of the moped among French teenage boys with the method of little stories. It deals with group influence on driving and taking risks

La influencia de modelos normativos en la muestra social del ciclomotor entre los jóvenes adolescentes: un estudio piloto/The influence of normative models in the social representation of the moped among young teenage boys: A pilot study

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Représentations et modèles de référence des adolescents scootéristes

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Fibre Optical Parametric Amplifiers for Communications

We present our recent achievements with polarisation-insensitive fibre optical parametric amplifiers (PI-FOPAs) for optical communications. We have demonstrated a robust fully automated (black-box) PI-FOPA operation in the C and L bands simultaneously with gain of ~20 dB and output power over 23 dBm when amplifying polarisation-multiplexed WDM QAM signals and a bursty traffic. Additionally, we have demonstrated a PI-FOPA to amplify WDM signals in the S band and across a continuous bandwidth of 40 nm. Finally, we have demonstrated a power budget improvement of a transient-sensitive link by up to 8 dB when employing a PI-FOPA with noise figure of ~6 dB as a drop-in replacement of an EDFA

Efficiency of four-wave mixing between orthogonally polarized linear waves and solitons in a birefringent fiber

International audienceWe analyze the interaction between orthogonally polarized solitons and dispersive waves via four-wave mixing in a birefringent fiber. We calculate analytically the efficiency of the phase-sensitive scattering between orthogonally polarized soliton and dispersive wave. Experiments performed by using a photonic crystal fiber perfectly match the analytical predictions

Topographic fibers: a platform for fundamental physical phenomena

International audienceWe review the fundamental physical phenomena associated with parametric resonance which can be successfully investigated in topographic fibers characterized by suitably engineered oscillating dispersion