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La diffusion Brillouin dans les fibres optiques microstructurées

Abstract : This thesis deals with both forward and backward Brillouin scattering (BS) in microstrutured optical fibres (MOF) which results from an interaction between a light wave and an acoustic wave. This work shows that the wavelength-scale periodic succession of air-holes in MOFs drastically changes the elastic wave distribution and thus leads to novel dynamical behaviours for Brillouin scattering with respect to what occurs in conventional telecommunication fibres. First, our experiment results revealed that forward or guided-acoustic wave Brillouin scattering in MOFs is substantially enhanced only for a set of high-frequency acoustic modes that are strongly localized to the MOF's core, as numerically predicted by the finite element method. Second, a multi-peaks spectral broadening in the backward Brillouin scattering spectrum is experimentally observed that was further checked by a position-resolved mapping of the Brillouin gain spectrum along the MOF. This inhomogeneous spectral broadening leads to a significant increase of the Brillouin threshold that can not be attributed to the structural variation of the fibre but rather to the air-hole microstructure itself. Moreover, distributed measurements demonstrated that some of these acoustic modes are very sensitive to stress applied along the fibre. Beyond the scope of this thesis, we report in appendix the generation of several supercontinuua spanning more than 1300 nm by use of a microchip laser emitting at the 532 nm and the same MOFs as for Brillouin scattering.
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Contributor : Jean-Charles Beugnot <>
Submitted on : Monday, July 14, 2008 - 1:07:17 PM
Last modification on : Friday, July 6, 2018 - 3:06:07 PM
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  • HAL Id : tel-00296632, version 1

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Jean-Charles Beugnot. La diffusion Brillouin dans les fibres optiques microstructurées. Physique [physics]. Université de Franche-Comté, 2007. Français. ⟨tel-00296632⟩

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