Viavi 8100 V2 Series User Manual page 307

I-OSNR sensitivity (only valid for OSA-500R and OSA-
110R)
This parameter defines the resolution of the polarization nulling routine for
true in-band OSNR measurement.
Low (fast)
Medium
High
Averaging acquisition
No (1 sweep), Low (4 sweeps), Medium (16 sweeps), High (32 sweeps)
This function can reduce the noise level of a value up to 5 dB. When the
acquisition is averaged, a bar graph showing the state of advancement of
the averaging is displayed at the bottom right of the screen.
Resolution (not available with OSA-110M)
Full
0.1/0.2/0.3/0.4/0.5, 1, 2 or 5 nm for modules OSA-50X.
Number of sweeps
In Statistics mode, this must be selected between 2 and 1000.
Low sensitivity mode for fast measurements,
recommended for ROADM system testing at data
rates up to 12.5Gbps and OSNR values ≤ 25dB
Recommended for data rates of ≥ 40Gbps and OSNR
≥ 22 dB, or for data rates up to 12.5Gbps and OSNR ≥
25dB.
Recommended for data rates of ≥ 40Gbps and OSNR
≥ 22 dB
maximum resolution bandwidth of the OSA (value
depends on specification of OSA type). See
page 263).
User Manual
Chapter 8 Optical Spectrum Measurement
OSA optical spectrum analyzer Setup
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