156 8163A/B, 8164A/B, 8166A/B User’s Guide
5 Tunable Lasers
How to Set the Modulation Mode
8 Move to the modulation source parameter, [Mod Src], and press Enter.
9Move 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.
There are two BNC connectors on the front panel of the 814xxB, 816xxB
and 8160xA tunable laser modules, a BNC input connector and a BNC
output connector.
There is one BNC connector on the front panel of the 81689A and
819xxA compact tunable laser modules, 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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