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Appendix C. Specifications
Definitions of Terms
where σ is the "RMS spectral width", to be calculated with the help
of the power and wavelength of each spectral component:
σ
Σ P
{
×
[
λ
=
–
i
i
Nonlinearity
When changing the displayed power level from the reference level,
D
, to an arbitrary displayed level, D
0
relative difference between the displayed power ratio, D
the true power ratio P
/P
1
(
⁄
)
⁄
(
N
=
D
D
P
1
0
1
Please note: A reference level between 10 and 20µW is chosen by
international convention.
Absolute PDL/PDG uncertainty
PDL describes the relative difference between an optical
component's maximum and minimum transmission loss or gain
assuming all states of polarization have been covered.
The PDL/PDG uncertainty includes all random and systematic
uncertainties from the source, the polarization controller and the
optical power meter.
PDL is measured by applying random polarization states to the test
device.
Therefore, generating the polarization states which lead to min/max
transmission includes a random component. As a result, the
displayed PDL/PDG value tends to be smaller than the true PDL/
PDG value. Asymmetric uncertainty limits are specified to reflect
this characteristic.
If the test device includes several PDL producing components then
the overall PDL depends on the geometrical alignment of these
components. Accordingly, the measured PDL/PDG value may
change as a consequence of alignment changes within the test
device.
186
λ
]
2
⁄
}
P
total
, the nonlinearity, N, is the
1
0 :
⁄
)
P
–
1
0
/D
, and
1
0
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