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Chapter 12 High Resolution OSA Measurement
On/Off-OSNR Method
Indicates the noise level measured left and right of the peak of the optical channel
(out-of-band noise measurement), in the defined resolution.
6
The optical signal to noise ratio for the channel in dB.
In WDM mode this parameter indicates the out of band SNR result based on the
out-of-band noise measurement.
Contents of the table with statistics
When selecting the Statistics measurement mode and multiple acquisitions are
performed, statistics are calculated on the results. To display these results in the table,
press the Table Contents key, then Statistics. Different Statistics keys are available to
choose the content of the table display for each channel.
The following statistics can be selected: wavelength or frequency statistics, power statis-
tics, and SNR statistics.
The display will give current value, average value, max. value, min. value and standard
deviation, or delta between min and max (selectable).
In the mode Statistics Mixed the table will show a mixture of statistical results: current,
min. and max of wavelength or frequency, and current, min. and max of the power levels.
On/Off-OSNR Method
Challenge
This is a precise out-of-service method used for measuring the in-band OSNR of stan-
dard and also of polarization-division multiplexed (PDM) systems.
Principle of "On/Off-OSNR Measurement"
The On/Off-OSNR method is based on measuring the noise power when the transmis-
sion channel is switched-off.
This is a 2 step method:
1
Switch-on all channels and perform a standard WDM measurement
All parameters like power (Pon) and wavelength are measured and stored in the
instrument
400
User Manual
78000010220 Rev. 024
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Troubleshooting
