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Specifications
52
External Input Power Range
The range of external input power levels for which the specified
uncertainties apply.
External Input Damage Power
The maximum power level that can be applied to the input port
without permanent change of the return loss meter characteristics.
Center Wavelength
The center wavelength is defined as the spectral center of gravity. For
a Fabry-Perot type laser source with discrete longitudinal modes, this
definition can be expressed as:
where:
Conditions: Warmup time as specified, temperature as specified.
Wavelength Range
The range of external input wavelengths for which the specified
uncertainties apply.
Relative Uncertainty
The maximum difference between a change of measured return loss
and the correspondent change of actual return loss. Symbol ∆R
expressed in dB :
∆5
UHO
=
where R
is the actual return loss, R
x
reference, and apostrophe ( ' ) indicates measured quantities.
The relative uncertainty includes receiver nonlinearity, receiver
polarization sensitivity, and uncertainty of input power monitoring.
Conditions: "Termination calibration" prior to measurement.
Constant ambient temperature, constant wavelength and source
polarization state. Other conditions as specified.
NO TE
This parameter is needed to determine the accuracy of return loss
changes, for example caused by adjusting an optical component.
Agilent 81610A/11A/12A/13A/14A Return Loss Module, Fifth Edition
λ F
P
= power leveles of the individual longitudinal lines
i
λ
= wavlengths of the individual longitudinal lines
i
(
' 5
'
)
(
)
5
5
5
[
[
–
–
–
0
0
Definition of Terms
3 L λ L
=
---------- -
Σ3 L
(all quanties expressed in dB)
is an arbitary return loss
0
,
rel
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