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Erbium‐doped fiber amplifiers are analyzed by solving numerically Maxwell equations and propagation‐rate equations of a homogeneous three‐level laser medium. A finite‐element code is used to account for the effect of spatial mode distributions and erbium concentration profile, while an iterative procedure, based on the Runge‐Kutta algorithm, allows to compute both gain and amplified spontaneous emission spectra. A comparison of the performance of 1480 and 980 nm pumped amplifiers is presented. The effect of different erbium concentration profiles on amplifier performance is also investigated.
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Pasquale et al. (1993) studied this question.
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