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Author Blanc, Wilfried ♦ Sebastian, Thomas Lee ♦ Dussardier, Bernard ♦ Michel, Claire ♦ Faure, Basile ♦ Ude, Michèle ♦ Monnom, Gérard
Source arXiv.org
Content type Text
File Format PDF
Date of Submission 2008-08-28
Language English ♦ German
Subject Domain (in DDC) Computer science, information & general works ♦ Natural sciences & mathematics ♦ Physics
Subject Keyword Physics - Optics ♦ physics:physics
Abstract Thulium-doped optical fibre amplifiers (TDFA) are developed to extend the optical telecommunication wavelength division multiplexing (WDM) bandwidth in the so-called S-band (1460-1530 nm). The radiative transition at 1.47 lm (3H4 -> 3F4) competes with a non-radiative multi-phonon de-excitation (3H4 -> 3H5). The quantum efficiency of the transition of interest is then highly affected by the phonon energy (Ep) of the material. For reliability reasons, oxide glasses are preferred but suffer from high phonon energy. In the case of silica glass, Ep is around 1100 cm-1 and quantum efficiency is as low as 2%. To improve it, phonon energy in the thulium environment must be lowered. For that reason, aluminium is added and we explore three different core compositions: pure silica, and silica slightly modified with germanium or phosphorus. The role of aluminium is studied through fluorescence decay curves, fitted according to the continuous function decay analysis. From this analysis, modification of the thulium local environment due to aluminium is evidenced.
Description Reference: Journal of Non-Crystalline Solids 354 (2007) 435-439
Educational Use Research
Learning Resource Type Article


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