Effect of channel adding/dropping on EDFA transients

In this paper, we investigate the technique to control the transients by means of channel adding/dropping in cascades of erbium-doped fiber amplifiers (EDFAs) in optical communication system. We demonstrate the transient reduction via simulation by employing the all-optical gain clamping (AOGC) in a chain of erbium-doped fiber amplifiers. We show that as EDFAs are gradually added in the optical link, the transients are also reduced significantly. It is observed that when we use cascade of six EDFAs and note the transient reduction, it is not as much as in case of chain of ten EDFAs in which the transients are greatly suppressed. Using the same model we further compare the transient response of Compact EDFAs and Transient EDFAs. It is observed that suppression of transients is much in Compact EDFAs than Transient EDFAs.