Viavi 8100 V2 Series User Manual page 322

Chapter 8 Optical Spectrum Measurement
Measurement of I-OSNR
1 Press S
2 Press
The instrument will be set for in-band OSNR measurements.
All Parameter settings will be done automatically:
The following parameters will be pre-set:
Sweep mode
Sweep range
I-OSNR sensitivity
Resolution
Channel detection
Min channel spacing
OSNR method
noise Acq. BW
OSNR meas Type
3 Select Show I-OSNR trace: Yes
In the I-OSNR mode the polarization nulling trace can be displayed on the screen by
activating the Show I-OSNR trace to Yes.
A blue trace will then show the progress of the suppression of the polarized signal by the
polarization nulling method.
Manual Settings:I-OSNR sensitivity (for OSA-500R and OSA-
110R only)
I-OSNR sensitivity will set the number of measurements performed for polarization
nulling
• Low (fast) mode (<2 min measurement time)
Fast measurement with small number of polarization nulling measurements
286
until OSA test setup appears.
ETUP
Test Auto I-OSNR
single
ext. C-band= 1525-1570nm, covering all EDFA
applications
(for OSA-500R only) needs to be set manually, see below
full, i.e. highest resolution
permanent auto detection of channels & ch-spacing
std 50GHz, needs to be adjusted manually, see below
needs to be adjusted manually, see below
standard 0.1nm
S/N = indicates real signal to noise measurement
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