This part of IEC 61290 applies to optical fibre amplifiers (OFAs) using active fibres, containing rare-earth dopants, presently commercially available. The object of this standard is to establish uniform requirements for accurate and reliable measurements, by means of the optical demultiplexer test method, of the following OFA parameters, as defined in clause 3 of IEC 61291-1: a) pump leakage to output; b) pump leakage to input. NOTE – All numerical values followed by (‡) are currently under consideration.