50 Keysight N777-C Series Tunable Laser Family User’s Guide
3 Definition of Terms
Power linearity
When measuring the ratios (in dB) between the displayed power level and
the actual power level for different output power levels of the tunable laser
source, the power linearity is ± half the difference between the maximum
and the minimum value of all ratios.
Figure 19 Power linearity.
Conditions: Uninterrupted tunable laser source output power, constant wavelength
setting, constant temperature. Other conditions as specified.
Power repeatability
The uncertainty in reproducing the power level after changing and
re-setting the power level. The power repeatability is ± half the span
between the highest and lowest actual power.
Conditions: Uninterrupted tunable laser source output power, constant wavelength
setting, constant temperature. Other conditions as specified.
The long-term power repeatability can be obtained by taking the power
repeatability and power stability into account.
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