A numerical analysis for erbium-doped tellurite-based fiber amplifiers (EDF
A) is presented for the first time in the literature. Modal and propagation
equations are solved using the finite-element method and the Runge-Kutta a
lgorithm, respectively, and are applied to a homogeneous four-level erbium-
doped fiber pumped at 1480 nm. Energy transfer due to cooperative up-conver
sion, cross relaxation, and excited state absorption is considered here. Co
mparisons with published experimental data confirm the present theoretical
results. (C) 2000 John Wiley & Sons, Inc.