Tellurite-based optical fiber amplifier analysis using the finite-element method

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.