How to Modulate a Signal Tunable Lasers
Agilent 8163A/B, 8164A/B, and 8166A/B User’s Guide, Fourth Edition 135
Figure 76 shows how a TTL-level input signal modulates the optical
output. Digital modulation sets the frequency of the output signal.
To set the amplitude of the output signal, set the power parameter.
This is the maximum output power of the output signal; at the
minimum output power, no power is output.
To enable external digital modulation:
1 Move to the Tunable Laser channel and press [Details].
2 Move to [Mod Src] and press Enter.
3 Move to <External Digital> by using the cursor key, and press
Enter. The text ExtD appears in the Tunable Laser channel.
External Analog Modulation
External analog modulation uses a signal of up to 5 V
pp
. A 5 V
pp
signal
causes 15% modulation of the power of the optical 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.
Figure 76 External Digital Modulation
t
TTL-level Input Signal
Input
Vo l t a g e
Output
Power
Optical
t
Optical Output Signal
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