Laser Sources How to Use Laser Source Modules
98 Agilent 8163A Lightwave Multimeter, Agilent 8164A Lightwave Measurement 
System, & Agilent 8166A Lightwave Multichannel System, Fourth Edition
7 Move to <Internal>, by using the cursor key, and press Enter. The text Mod 
appears in the Laser Source channel.
8 Move to the [Mod Src] parameter for the upper wavelength source and press 
Enter.
9 Move to <Coherence Ctrl.>, by using the cursor key, and press Enter. The text 
Mod is still displayed in the Laser Source channel.
10 Enable the laser output, by pressing the Active hardkey on the module’s front 
panel.
How to Use Triggers
Some Laser Source modules allow you to output trigger signals to external 
measurement instruments.
How to Use Output Triggering
You can configure the output trigger connector to output a TTL signal at the 
frequency of the internal modulation of a Agilent 8163A Series Laser Source 
module.
To set your module’s Output Trigger Configuration:
1 See “How to Set the Trigger Configuration” on page 62 for how to configure 
the trigger connectors.
2 Move to the Laser Source channel and press [Menu].