User`s guide

Optional Tests Performance Tests
Agilent 81689A, 81689B and 81649A Tunable Laser Modules User’s Guide, Third Edition 61
Figure 14 Signal-to-Spectral SSE Measurement
13 To reflect for a specified value at 1 nm bandwidth related to the
measurement bandwidth of 0.5 nm, reduce the measured absolute
value by 3 dB and note the result in the test record.
For example:
14 Increase the wavelength of the Tunable Laser by 10 nm as listed in
the Test Record.
Change the Center Wavelength of the Specrum analyser accordingly.
Press [Center], then enter the new wavelength.
You can fine-tune the actual wavelength to the center of the display
by using the Modify knob.
15 Repeat steps 10 to 14 for the wavelength range listed in the Test
Record.
measured value at RES BW = 0.05 nm BW -44.5dB
absolute of measured value at RES BW = 0.05 nm BW 44.5 dB
correction to a RES BW = 1 nm 44.5 dB - 3 dB = 41.5 dB
Result noted in Test Record 41.5 dB