Tunable Lasers How to Modulate a Signal
120 Agilent 8163A Lightwave Multimeter, Agilent 8164A Lightwave Measurement
System, & Agilent 8166A Lightwave Multichannel System, Fourth Edition
How to Set the Output Power of a Modulated Signal
To set the output power to 555.000 µW:
1 Move to the Tunable Laser channel and press [Details] softkey.
2 Move to the power parameter, [P], and press [Pwr unit].
3 Move to <W>, by using the cursor key, and press Enter.
4 Press Enter to start editing the output power value.
5 Enter 555.000, press [Unit+] or [Unit−], as required, to select <µW> as the
power units, and press Enter.
How to Set the Frequency of a Modulated Signal
To set the frequency of the modulation to 6.500 kHz:
6 Move to the frequency parameter, [Mod Frq], press Enter.
7 Enter 6.500 press Enter.
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.
• <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 81680A,
Agilent 81682A, and Agilent 81640A - 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.
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