56 Keysight N777-C Series Tunable Laser Family User’s Guide
3 Definition of Terms
Logged wavelength by interpolation. The repeatability is expressed as ±
half the span between the maximum and the minimum value of all nominal
values.
Figure 25 Wavelength repeatability (continuous sweep mode).
Conditions: As specified. No mode-hop.
Measurement: 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.
Wavelength repeatability (stepped mode)
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.
Measurement: Using a wavelength meter, averaging time
≥ 1s.
The wavelength repeatability of the low-SSE output (if applicable) is the
same as the wavelength repeatability of the high power output
(guaranteed by design).
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