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Reference conditions
The specified conditions during the spectral responsivity calibration,
or conditions which are extrapolated from the conditions during
calibration.
Conditions: power level, beam diameter or fiber type, numerical
aperture, wavelength, spectral width, ambient temperature as
specified, at the day of calibration. → Noise and drift observed over a
specified observation time, with a temperature change of not more
than ± ∆ T.
Relative uncertainty (spectral ripple) due to
interference
Uncertainty of power reading when using a coherent source, due to a
periodic change of the power meter's responsivity caused by optical
1
interference
between reflective interfaces within the power meter's
optical assembly.
Conditions: constant wavelength, constant power level, angled
connector as specified, linewidth of source <100 MHz, temperature as
specified.
Relative uncertainty due to polarization
Also termed polarization-dependent responsivity (PDR), the relative
uncertainty due to polarization is the uncertainty of the displayed
power level on the input polarization state, expressed as the difference
between the highest and the lowest displayed power. Uncertainty
figures are based upon a 95% confidence level.
Conditions: laser source with variable polarization state, generation of
all possible polarization states (covering the entire Poincaré sphere),
constant wavelength, constant power level, angled connector as
specified, temperature as specified.
Return loss:
The ratio of the incident power to the reflected power expressed in dB.
Symbol: RL.
Conditions: the return loss excludes any reflections from the fiber
end used as radiation source.
Agilent 81632B/3B/4B/6B/7B Power Sensor Modules and Agilent 81635A Dual Power
Sensor Module, First Edition
P
in
------------ -
RL
=
10
log
P
ba ck
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