EXFO FTB -5240S/5240BP Optical Spectrum Analyzer for FTB 500 (NS-1434) User Manual
Page 315
Managing Results
Optical Spectrum Analyzer
307
Managing WDM Test Results
2. Press Global Parameters.
3. Select the Analysis tab.
4. Enter values in the boxes as explained below:
³
Peak detection level (dBm): indicates the minimum power level
from where the peak can be considered as a signal.
³
RBW for OSNR (nm): indicates the resolution bandwidth for the
selected OSNR value. The resolution bandwidth of an OSA
determines its ability to deal with close optical channel spacing. It
is measured as the width of the response curve at half peak power
(i.e., 3 dB down) of the instrument to a monochromatic test signal.
The instrument’s RBW value is written below the graph on the right
(below wavelength offset).
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