Patent ID: 8094369

Claim:
A regulatable optical amplifier, comprising: at least two series-connected amplifier groups, in which each amplifier group respectively has a pump device and a regulating device connected to the pump device, the regulating device, in the event of a change in the input power, adapting the pump power in order to maintain a constant amplifier gain; and a power monitor device for detecting changes in the input power is connected upstream of a first amplifier group, the electrical output of the power monitor device being connected both to a first regulating device and to a second regulating device, wherein inserted between the first and the second regulating device is a control chain having a series circuit comprising a high-pass filter having a cut-off frequency which corresponds approximately to the cut-off frequency of the first amplifier group, a delay and signal-shaping unit, and a feedforward control unit for generating a correction signal for the second regulating device.