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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
µ
W:
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 <
µ
W> 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.
C A U T I O N
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.