User`s guide

Performance Tests Power Tests
124 Agilent 81600B Tunable Laser Source Family, Fourth Edition
2
Determine OSA noise, that is the noise of the OSA alone without
applying the Tunable Laser signal:
a Switch off the laser output of the Tunable Laser.
b Set the OSA
• Set the span to 30 nm.
Press Span and enter this value.
• Set the center wavelength, OSA_
λ_center, to λ
FBG
- 0.5 nm. Press
Center and enter the value.
• Set the reference level to -40 dBm.
Press [AMPL], press [Ref LVL], and enter this value.
• Set the Sensitivity to -90 dBm.
Press [AMPL], press [SENS AUTO MAN
], and enter this value.
• Set the resolution bandwidth to 1 nm.
Press [BW Swp], and enter this value.
c Record the noise spectrum for a single sweep.
d Measure the partial noise of the spectrum.
With a sampling step of 1 nm on the OSA, check all
201 power levels within the recorded spectrum,
starting at OSA_λ_center - 15 nm and finishing at OSA_λ_center +
15 nm.
Record the "partial noise power level" values in a table in [pW], where
1 pW = 10
-12
W.
For example:
Table 9 Signal to Total SSE - Low SSE output
Wavelength,
Reative to OSA_λ_center
Partial Noise Power Levels
-15 nm pW
-14 nm pW
-13 nm pW
..... pW
..... pW
-2nm pW
-1nm pW
0nm (= OSA_λ_center) pW
+1 nm pW