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2
Switch-off the channel carrying PDM signals and perform a second measure-
ment
The channel power measured at the deactivated channel wavelength will indicate
the in-band noise Poff = noise power
In-band OSNR is calculated based on Pon and Poff
Setup
In the Acquisition setup screen, set the parameter Mode to OO-OSNR and configure
the measurement as wished (see
Figure 198
OSA Setup: OO-OSNR configuration
Step 1: Reference measurement
1
In the Results page, select 'Ref. Acquisition'
OSA measurement (all channels ON)
All channels will be detected and the total channel power (=integrated ch-power) of each
channel will be shown and stored in the table = P_ch (Power [dBm]).
OSNR and Noise will not yet be displayed.
Step 2: Noise / OSNR measurement
1
In the Results page, select 'Noise Acquisition'
2
Switch off the channel you want to measure the OSNR (one or multiple chan-
nels).
3
Select Noise Acquisition measurement (Noise Acq) and start the measurement.
The OSA will perform a scan and automatically detect the channels switched-off.
"OSA optical spectrum analyzer Setup" on page
User Manual
Chapter 12 High Resolution OSA Measurement
78000010220 Rev. 024
On/Off-OSNR Method
and perform (Start) an
383).
401
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Troubleshooting
