Osnr - Viavi 8100 V2 Series User Manual

Chapter 8 Optical Spectrum Measurement
OSA optical spectrum analyzer Setup
This parameter is also used to set the range for integration to measure the accurate total
signal power of an optical channel. The window for channel power integration will be ±1/
2 the min. channel spacing setting left and right to the channel center frequency.
The measurement result will be displayed in the WDM table as 'Level' in dBm.
Min. Channel elevation
Defines the minimum elevation of two adjacent peaks from the valley between them
which is required to recognize independent channels. Peaks which are not separated by
a valley deeper than the min.channel elevation are considered as part of the same
optical channel.
This example shows two signals, the left having only one peak larger than the selected
Min.channel elevation, the right one with two peaks.
The two peaks of the right one are separated by a valley, but their elevation from that
valley is smaller than the Min.channel elevation. Therefore they are not treated as inde-
pendent sig-nals
Select Auto to define the value automatically or select Manual to enter a specific value
for the parameter.

OSNR

To modify these parameters, go to the OSNR line. A sub-menu then appears proposing
the following options:
OSNR method
1.Attention: all modification of these parameters has immediate repercussions on
the trace and entails the loss of the measurement statistics.
254
(only available in OSNR mode)
Side of the peak where the point of reference for noise
User Manual
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