Experimental demonstration of active equalization and ASE suppression of three 2.5-Gbit/s WDM-network channels over 2500 km using AOTF as transmission filters

Summary form only given. In this paper, we demonstrate the active equalization of the nonunifom EDFA gain and ASE suppression by using acoustic-optic tunable filters as transmission filters with active feedback. After 2500 km, the power differential is reduced from over 20 dB down to 2 db for three 2.5-Gbit/s WDM channels covering an 8-nm wavelength range. Furthermore, the active feedback fully compensates for dynamic variations in individual channel powers.