Abstract: A multistage optical amplifier is controlled to compensate for the effect of amplified spontaneous emission (ASE) by a method comprising the following steps. Optical input and output signals to a first gain stage are detected, and the drive current to the first gain stage is controlled in dependence on the optical input signal to the first gain stage. Optical input and output signals to a last gain stage are detected, and the drive current to the last gain stage is controlled to maintain the output power of the last gain stage substantially constant. The effect of ASE in the first gain stage is compensated for by applying a correction factor based on the ASE of the first gain stage and the output power of the first gain stage.