Splitter Compensation - Viavi 8100 V2 Series User Manual

S<->N Distance
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
Pre-defined: select 25 GHz (0.2 nm), 50 GHz (0.4 nm),100 GHz (0.8 nm)
from the peak.
Noise Shape
Filtered: evaluation for mixed filter shaped ROADM networks
Unfiltered: evaluation for networks without optical filters
Noise Acq. Bandwidth
Standard 0.1 nm
With the <> keys you can select other values between 0.05 nm and 1.0 nm.
OSNR meas.type: S / N or (S+N)/N
S/N: the integrated power in the channel minus the noise is considered as
signal
(S+N)/N: the integrated power in the channel without correction is consid-
ered as signal.

Splitter compensation

When the measurement is made after a tap coupler (also known as a splitter), it is
possible to compensate for the loss introduced by this element and to display the value
measured before or after it.
The following options are available:
1
Value
Unit
measurement is taken (left, right, average left and right, worst
case of left and right).
(only available in OSNR mode)
Distance between the peak of the channel and the point of
reference for the noise.
(only available for OSA-500R, OSA-500RS or OSA-110R in I-
OSNR mode)
Reference bandwidth used for the acquisition of noise:
Yes: activation of compensation and choice of its value using the
keys and : or the numeric keypad : from 1 to 30 dB (by
increments of 1) or 1 to 99% (by increments of 0.1%).
Choice of compensation in dB or as a percentage of the value
measured.
User Manual
Chapter 8 Optical Spectrum Measurement
OSA optical spectrum analyzer Setup
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