8163A/B, 8164A/B, 8166A/B User’s Guide 157
Tunable Lasers 5
Figure 90 External Digital Modulation
Figure 90 on page -157 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].
2Move to [Mod Src] and press Enter.
3Move 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.
t
TTL-level Input Signal
Input
Voltage
Output
Power
Optical
t
Optical Output Signal
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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