Wavelength Repeatability (Stepped Mode) - Keysight N777-C Series User Manual

3 Definition of Terms
Measurement:

Wavelength repeatability (stepped mode)

Measurement:
56
Logged wavelength
half the span between the maximum and the minimum value of all nominal
values.
Figure 25
Conditions: As specified. No mode-hop.
Using an optical power meter and by performing repeated spectral loss
measurement on a stable absorption peak from a reference component,
then analyzing the variation of the determined (interpolated) wavelength of
the peak.
The random uncertainty in reproducing a wavelength after changing and
re-setting the wavelength. The wavelength repeatability is ± half the span
between the maximum and the minimum of all actual values of this
wavelength.
Conditions: Uninterrupted tunable laser source output power, constant power level,
constant temperature. Other conditions as specified.
Using a wavelength meter, averaging time
The wavelength repeatability of the low-SSE output (if applicable) is the
NOTE
same as the wavelength repeatability of the high power output
(guaranteed by design).
by interpolation. The repeatability is expressed as ±
Wavelength repeatability (continuous sweep mode).
Keysight N777-C Series Tunable Laser Family User's Guide
≥
1 s.