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Fabrication et caractérisation de fibres optiques en silice dopées au thulium : Influence de l'environnement des terres rares sur l'amplification dans la bande S

Abstract : We report in this thesis the first studies aimed at permitting the realization of a silica based fibre thulium doped optical amplifier working in the S band of the telecommunication window (near 1470nm) in order to increase the usable bandwith for wavelength division multiplexing of the standard silica fibre network. To be able to amplify an optical signal with thulium ions in a high phonon energy silica glass based fibre we have adapted the fabrication process of the preforms made by MCVD technique in order to change the glass composition of less than 10 mol %. Thus an addition of Al2O3 allow to decrease the non radiative multiphononic decay between the 3H4 and 3H5 level, because of the rare earth environment modification. The liftetime of the 3H4 level goes from 14us in pur silica to 50us with addition of only 8.7 mol % of al2O3 giving a rise of the quantum efficiency from 2% to 8%. With the material upgrade and optogeometrical parameters optimisation with numerical simulations we measured small S band signal amplification on one of our silica based sample. This result is an important measurement for silica. In addition a predicted 20dB gain with 1W of pump power is predicted by the numerical simulations for a more efficent pump scheme end the material we did.
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Contributor : Basile Faure <>
Submitted on : Tuesday, February 7, 2006 - 8:06:44 PM
Last modification on : Monday, October 12, 2020 - 10:27:39 AM
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Basile Faure. Fabrication et caractérisation de fibres optiques en silice dopées au thulium : Influence de l'environnement des terres rares sur l'amplification dans la bande S. Physique Atomique [physics.atom-ph]. Université Nice Sophia Antipolis, 2005. Français. ⟨tel-00011556⟩

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