EXFO FTB -5240S/5240BP Optical Spectrum Analyzer - Manual (Page 140)

Setting Up the Instrument in Drift Mode
134 FTB-5240S/S-P/BP
Setting Up Acquisition Parameters
The wavelength range covered within these bands of the spectra are listed
below.

O band (original): 1255 to 1365 nm

E band (extended): 1355 to 1465 nm

S band (short wavelengths): 1455 to 1535 nm

C band (conventional “erbium window”): 1525 to 1570 nm

L band (long wavelengths): 1560 to 1630 nm

U band (ultralong wavelengths): 1620 to 1650 nm.
To set parameters in the Drift Settings tab:
1. From the main window, select the Drift Settings tab.
2. Set a delay unit and count before taking the first acquisition in a drift
measurement. The application will wait for this time before taking the
first acquisition of a drift measurement.