High blue power influence on the visible emissions of Er-doped germanosilicate optical fibres

The fluorescence decay of the ⁴F_3/2 transition in neodymium-doped silica optical fibers is analyzed with respect to neodymium concentration and temperature. New experimental data are compared with theoretical calculations based on (i) Grant's supposition W.J.C. Grant, Phys. Rev. B 4 (1971) 648] and (ii) the Förster T. Förster, Ann. Phys. (Paris) 2 (1948) 55] and Dexter D.L. Dexter, J. Chem. Phys. 21 (1953) 836] model. Grant's predictions are in reasonable agreement with the data. The nonexponential decay predicted by Förster and Dexter is insufficient to explain the experimental data.