Tunable Lasers How to Modulate a Signal
134 Agilent 8163A/B, 8164A/B, and 8166A/B User’s Guide, Fourth Edition
How to Set the Modulation Mode
8 Move to the modulation source parameter, [Mod Src], and press
Enter.
9 Move to <Internal>, by using the cursor key, and press Enter. The
text Int appears in the Tunable Laser channel.
How to Use External Modulation
The following external modulation modes are available:
•<External Digital> - External Digital Modulation
•<External Analog> - External Analog Modulation
•<Wavel. Locking> - Wavelength Locking
•<Backplane> - External Digital Modulation using Input Trigger
connector or Trigger Feedback from another module in the same
mainframe.
•<Coherence Ctrl.> - Coherence Control
External Digital Modulation
External digital modulation uses a TTL-level signal. Apply this signal
to the input BNC connector on the front panel of your Tunable Laser
module.
CAUTION There are two BNC connectors on the front panel of the
Agilent 81480B, Agilent 81482B, Agilent 81672B, Agilent 81680B,
Agilent 81682B, Agilent 81640B and Agilent 81642B - a BNC input
connector and a BNC output connector.
There is one BNC connector on the front panel of the Agilent 81689A -
a BNC input connector.
An absolute maximum of ±6 V can be applied as an external voltage to
any BNC connector.
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