Tj. Whitley et R. Wyatt, ALTERNATIVE GAUSSIAN SPOT SIZE POLYNOMIAL FOR USE WITH DOPED FIBER AMPLIFIERS, IEEE photonics technology letters, 5(11), 1993, pp. 1325-1327
The validity of the usual Marcuse-Gaussian approximation for fiber mod
es is discussed in the context of doped fiber amplifiers and an altern
ative spot-size polynomial is proposed: [GRAPHICS] The polynomial's us
e is illustrated by extending the range of a simple Gaussian-based, nu
merical model of an erbium-doped fiber amplifier. Excellent agreement
with a ''real field'' based model is demonstrated for practical fiber
V-values.