This part of 61290 applies to optical fibre amplifiers (OFAs) using active fibres, containing rare-earth dopants, presently commercially available. The object of this part of 61290 is to establish uniform requirements for accurate and reliable measurements, by means of the electrical spectrum analyzer test method, of the following OFA parameters, as defined in clause 3 of IEC 61291-1: a) input reflectance b) output reflectance