GAIN-CONTROL IN EDFAS BY PUMP COMPENSATION

Gain control by means of pump compensation in cascades of erbium-doped fiber amplifiers (EDFA's) is analyzed, Based on analytical expression s for the 1-dB rise/fall time for the case of channels add/drop, requi red pump power changes at each amplifier are derived in the form of si mple closed expressions. Numerical simulations of a system comprising 20 wavelength-division-multiplexed channels transmitted through a casc ade of 35 EDFA's are performed demonstrating the effectiveness of the gain control.