EXFO FTB-7000 OTDR for FTB-200 v2 - Manual (Page 211)

Analyzing Traces with the Bidirectional Analysis Application
OTDR 197
Creating Bidirectional Measurement Files
Creating Bidirectional Measurement Files
To work with the OTDR Bidirectional application, you must acquire and
save the traces (in the OTDR application) before opening them with the
bidirectional analysis application.
You can open unidirectional trace files to combine them into a
bidirectional measurement file. It is possible to use both single-wavelength
and multiwavelength traces. However, once a multiwavelength trace file is
recalled, it is converted to single-wavelength trace files. Bidirectional
measurement files will automatically be created for each of the
wavelengths.