EXFO IQS-2600B Tunable Laser Source for IQS Platforms - Manual (Page 40)

Setting Sweep Parameters
34 IQS-2600B
Setting the Sweep Direction
Setting the Sweep Direction
The sweep can be either unidirectional, meaning that it will only go in one
direction, or bidirectional, sweeping back and forth.
To set the direction of the sweep:
Select the desired sweep direction by selecting the appropriate button in
the Sweep tab of the Settings function tab.