Viavi 8100 V2 Series User Manual page 423

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
1
OSNR method
Side of the peak where the point of reference for noise measurement
is taken (left, right, average left and right, worst case of left and right).
S<->N Distance
Distance between the peak of the channel and the point of reference
for the noise.
- Auto: distance determined according to spacing of channels.
- Manual: an additional line Manual value opens. Go down and modify the
value with < > or click on the value and enter a new one in the keypad that
opens
1.Attention: all modification of these parameters has immediate repercussions on
the trace and entails the loss of the measurement statistics.
1
User Manual
Chapter 12 High Resolution OSA Measurement
Configuration of the instrument
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