Tunable Lasers How to Set the Power
120 Agilent 8163A/B, 8164A/B, and 8166A/B User’s Guide, Fourth Edition
What is Excessive Power ?
If the text ExP is displayed in a Tunable Laser channel, see Figure 66,
you have set an output power level that is larger than the laser diode
can produce at the selected wavelength.
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.
Figure 66 Excessive Power
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