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 electrical 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.