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 the optical spectrum analyzer test method, of the following OFA parameters: - small-signal gain; - reverse small-signal gain; - maximum small-signal gain; - maximum small-signal gain wavelength; - maximum small-signal gain variation with temperature; - small-signal gain wavelength band; - small-signal gain wavelength variation; - small signal gain stability; - polarization-dependent gain variation.