Power Stability - Keysight 81940A User Manual

3 Specifications

Power stability

Relative intensity noise (RIN)
40
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 13 Power stability
Cond itions:
Time span as specified. Uninterrupted tunable laser source output power,
constant wavelength and power level settings, constant temperature.
Specifies the ratio between the mean-square of the optical power
Δ
fluctuation amplitude
bandwidth B, and the square of the average optical power Pavg.
RIN, if expressed as "dB/Hz", is calculated by:
Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User's Guide
P within a specified frequency range f and for
f,B