Ground-state and excited-state absorption in rare-earth doped optical fibres
- 1 March 1990
- journal article
- Published by Institution of Engineering and Technology (IET) in Electronics Letters
- Vol. 26 (5) , 320-321
- https://doi.org/10.1049/el:19900210
Abstract
We present a modelling of absorption in rare-earth doped optical fibres. The transmission through the fibre is derived from ground-state absorption (GSA) and excited-state absorption (ESA) parameters. Fitting to experimental data obtained with thulium at 676.4 nm (GSA only) and 647.1 nm (GSA + ESA) yields experimental values for the absorption parameters. At 647.1 nm, ESA gives rise to transmission decreasing with power, which modifies the usual behaviour of absorption saturation.Keywords
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