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.