This part of IEC 61290 applies to optical fibre amplifiers(OFA)using active fibres,containing
rare-earth dopants currently commercially avallable.
The object of this lnternational Standard is to establish uniform requirements for accurate and
reliable measurements of the signal-spontaneous noise figure as defined in IEC 61291—1.
The test method independently detects amplified signal power and amplified spontaneous
emission(ASE)power by launching optical pulses into the OFA under test.The ASE level is
measured by synchronously measuring the power on an optical spectrum analyzer(OSA)
during the optical pulse off period.The average optical signal level is measured by random
sampling in the OSA.
Such measurement is possible because the gain response of the rare—earth doped OFA is
relatively slow.particularly in Er—doped OFA.However,since the OFA gain dynamics vary
with amplifier types,operating conditions,and control schemes,the gain dynamics should be
carefully Considered when applying the present test method to va rious OFA.The
manufacturer of the OFA should present data validating the required modulation frequency to
limit the error to<1 dB.The measurements for obtaining this information are described in
Annex A.
Two alternatives for determining the signal—spontaneous noise figure are specified;namely,
the optical switching technique and the gated-OSA technique.The procedure described in this
standard is the gated—OSA technique.The optical switching technIqMe is described in
IEC 61290-10-1.
The test method described is,in general,for multichannel applications.Single-channel
applications are a special case of multichannel applications
NOTE All numerical values followed by are suggested values for which the measurement is assured.Other
values may be acceptable but should be verified.