Keysight Technologies N77 Series User Manual page 69

Keysight N77xx Series
Settling Time
Maximum time needed to change the attenuation or power level by a
specified step, from the beginning until the end of the change.
Specification wavelength range
The wavelength range for which all specifications and characteristics
apply, if not differently stated.
Spectral ripple (power meter; due to interference)
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 2nd
order fit (low frequency part).
Specifications and Regulations
Compliance 3
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