Keysight N777-C Series Tunable Laser Family User’s Guide 51
Definition of Terms 3
Power stability
Specifies the change of the power level of the tunable laser source over
time, expressed as ± half the span (in dB) between the highest and lowest
actual power.
Figure 20 Power stability.
Conditions: Time span as specified. Uninterrupted tunable laser source output power,
constant wavelength and power level settings, constant temperature.
Other conditions as specified.
Relative intensity noise (RIN)
Specifies the ratio between the mean-square of the optical power
fluctuation amplitude
ΔP
f,B
within a specified frequency range f and for
bandwidth B, and the square of the average optical power P
avg
.
RIN, if expressed as "dB/Hz", is calculated by:
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