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Gain Dynamics Of Erbium-Doped Fiber Amplifiers

The gain dynamics of erbium-doped fiber amplifiers are studied both experimentally and theoretically. It is shown that the transients associated with gain saturation and gain recovery during multichannel amplification have long characteristic times, i.e. in the 100 its-1 ms range. Such slow gain dynamics effectively prevent saturation-induced crosstalk and intermodulation distortion effects in the amplification of high-speed WDM and FDM signals.