EXFO FLS-2600B Tunable Laser Source - Manual (Page 29)

Setting Standard Parameters
Tunable Laser Source 21
Setting the Power
Setting the Power
To set the output power, you must be in Power Edition mode. To select the
Power Edition mode, press the Power button on the front panel, so that
Power appears in the left part of the display.
To select a specific power value, turn the selection dial clockwise or
counterclockwise until you reach the desired power value. The source will
then send the command to set the power according to your selection.
Note: If the set power cannot be maintained at the selected wavelength
(especially at extreme wavelengths), the displayed power value will flash
and you will no longer be in Constant Power mode. The output power
stability and level will be the natural laser emission. To stop the power
display from flashing and have the power regulation work again, set the
wavelengths at an interval where the displayed power can be reached or
select a lower power for your wavelength. For more information on how to
set a specific wavelength, see Entering a Wavelength Directly on page 19.
Your source can either be in Normal Power mode (where the ALC is
enabled), or in Max. Power mode (where the ALC is disabled).
To change the Automatic Level Control status, press on the Power/Pmax.
button. If you see Power on the left side of the display, you are in Normal
Power mode. If you see Max. Power on the right side of the display, you are
in Max. Power mode. Once you have selected Max. Power, the unit reverts
to  or  List mode, according to the one you used last.
Normal
nm
Fine-tune
Power
dBm