How to Modulate a Signal Tunable Lasers
Agilent 8163A Lightwave Multimeter, Agilent 8164A Lightwave Measurement System, & Agilent 8166A Lightwave
Multichannel System, Fourth Edition
123
To enable wavelength locking:
1 Move to the Tunable Laser channel and press [Details].
2 Move to <Mod Src> and press Enter.
3 Move to <Wavel. Locking>, by using the cursor key, and press Enter. The text
λLock appears in the Tunable Laser channel.
External Digital Modulation using Input Trigger
Connector
External digital modulation uses a TTL-level signal. Apply this signal to the Input
Trigger connector on the rear panel of your mainframe. For information on
external digital modulation, see “External Digital Modulation” on page 120.
CAUTION A maximum of 5 V can be applied as an external voltage to the Input Trigger
connector, see page 217.
Take care not to use the Trigger Output connector or the Remote Interlock
connector for modulation. Do not apply an external voltage to these connectors.
NOTE If external digital modulation using the Input Trigger Connector, <Backplane>, is
chosen as the modulation source, [Mod Src], the Agilent 81689A Tunable Laser
module behaves differently from all other modules. If the duty cycle varies:
• the average power of the output signal of the Agilent 81689A Tunable Laser
module varies in proportion with the change in duty cycle, while,
• the power of the output signal of all other modules adjusts so that the average
power of the output signal is always 50% of the set power.
To enable external digital modulation using the Input Trigger Connector:
Figure 80 Wavelength Locking
λ
V
+5 V
-5 V
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