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CAU TI O N
Figure 5-14
Tunable Laser Sources
How to Modulate a Signal
How to Use External Modulation
The following external modulation modes are available:
•
<E
XTERNAL
•
<E
XTERNAL
•
<W
. L
AVEL
•
<B
ACKPLANE
Trigger connector.
•
<C
C
OH
TRL
External Digital Modulation
External digital modulation uses a TTL-level signal. Apply this
signal to the input BNC connector on the front panel your Tunable
Laser module.
There are two BNC connectors on the front panel of the HP 81680A,
HP 81682A, and HP 81640A - a BNC input connector and a BNC output
connector.
There is one BNC connector on the front panel of the HP 81689A - a BNC
input connector.
An absolute maximum of ±6 V can be applied as an external voltage to any
of these BNC connector.
Input
Voltage
Optical
Output
Power
External Digital Modulation
118
D
> - External Digital Modulation
IGITAL
A
> - External Analog Modulation
NALOG
> - Wavelength Locking
OCKING
> - External Digital Modulation using Input
> - Coherence Control
TTL-level Input Signal
Optical Output Signal
t
t
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