EXFO FTB -5240S/5240BP Optical Spectrum Analyzer - Manual (Page 56)

Setting Up the Instrument in WDM Mode
50 FTB-5240S/S-P/BP
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:

Name: name of channel.

(Center wavelength/frequency): spectral center-of-mass for the
peak in that channel.

Signal Power: signal power for the selected channel (excludes
noise).

OSNR: 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).

Noise: noise level for the selected channel. The type of noise is
indicated in front of the measurement (IEC, Fit, Inb, Inb nf, IECi,
CCSA ).

BW 3.00 dB: bandwidth measured by taking the width of a signal at
50 % linear power of the peak, or -3 dB from the peak.

BW at x dB: bandwidth measured by taking the width of a signal at
x dB from the peak.