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3
Definition of Terms
Specification wavelength range
Spectral ripple (power meter; due to interference)
Storage conditions
Total uncertainty
68
The wavelength range for which all specifications and characteristics
apply, if not differently stated.
A coherent input signal causes optical interference1 between reflective
interfaces within the power meter's optical assembly, including the end
face of a connected fiber. Optical interference causes a wavelength
dependent periodic change of the power meter's responsivity. Spectral
ripple is defined as ± half the difference between the highest and the
lowest power resulting from the periodic change.
Conditions: Constant input power, constant state of polarization (SOP).
Connector as specified. Other conditions as specified.
Measurement: Using a laser source without spectral ripple or with known
(monitored) spectral ripple and linewidth < 100 MHz and stepping the
wavelength over the specified range. The periodic part in the
measurement result is separated by subtracting the polynomial 2
fit (low frequency part).
Allowed temperature and humidity range for the non-operating
instrument. Wait for acclimation to within the "Operating temperature"
before turning on the instrument.
The maximum relative difference U between measured (displayed) power
M and actual (true) power P for a specified set of operating conditions,
expressed in percent. Powers expressed in Watts. Excluding "Noise pp
(dark)" (see,
Noise pp (dark)
on page 62).
U = 100% * (M/P - 1)
Conditions: Operating conditions as specified. Other conditions as
specified.
on page 64) and "Drift (dark)" (see,
Keysight N774-C & 8162-C Series User's Guide
nd
order
Drift (dark)
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