EXFO FTB -5240S/5240BP Optical Spectrum Analyzer for FTB 500 (NS-1434) - Manual (Page 61)

Setting Up the Instrument in WDM Mode
Optical Spectrum Analyzer 53
Defining Preferences
2. Select the WDM Results tab.
3. Select which parameters you want to display in the Results tab from
the list of available choices:
³
Name: indicates the name of channel.
³
Center wavelength/frequency: indicates the spectral
center-of-mass for the peak in that channel.
³
Signal Power: indicates the signal power for the selected channel
(excludes noise).
³
OSNR: is the Optical Signal to Noise Ratio, given by Signal power
(according to the current calculation method, in dBm) minus
Noise (according to the current calculation method, in dBm).
³
Noise: indicates the noise level for the selected channel.
³
BW 3.00 dB: indicates bandwidth measured by taking the width of
a signal at 50 % linear power of the peak or -3 dB from the peak.
³
BW at x dB: indicates bandwidth measured by taking the width of
a signal at x dB from the peak.