Applies to optical fibre amplifiers using active fibres, containing rare-earth dopants, presently commercially available. Establishes uniform requirements for accurate and reliable measurements, by means of optical power meter test method, of the following OFA parameters: - nominal output signal power; - large-signal output stability; - saturation output power; - maximum input signal power; - maximum output signal power; - input power range; - output power range; - maximum total output power.