140 8163A/B, 8164A/B, 8166A/B User’s Guide
5 Tunable Lasers
Figure 80 Excessive Power
To avoid this you can:
• reduce the optical output power,
• press [Pmax] to select the highest permissible power for the selected
wavelength value, or
• press [Pmax/Swp] to select the highest permissible power for the
selected wavelength sweep.
How to Set the Laser to the Dark Position
Attenuator
If your tunable laser has an built-in optical attenuator, you can use
<Dark position> to block all laser light from the output. You can use this as
an alternative to disabling the laser. To enable/disable the dark position:
1 Move to the Tunable Laser channel and press the [Menu] softkey.
2 Move to the <Dark position> and press Enter. The Dark Position box
appears.
3 Move to one of the following menu items:
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