Abstract

In this work we investigate the degradation of the signal-to-noise power ratio (SNR) at the output of the communication line caused by the random fluctuations of a gain in lumped optical amplifiers. There are a few sources of gain fluctuation: effect of pump modulation, random deviiation of Erbium concentration from one amplifier to the next and others. In [1] Kubota et al. have considered by numerical simulation the soliton propagation over long distance taking into account the gain fluctiation (±1,5%). It was pointed out that the pulse width fluctuation over 9000 km was within ±10%, and the pulse shape was clearly distinguished from noises.

© 1991 Optical Society of America