User guide

Setting Standard Parameters

Tunable Laser Source 21

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

Fine-tune

Power

dBm