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CAUT IO N
NOT E
Tunable Laser Sources
How to Modulate a Signal
Measurement System. For information on external digital
modulation, see "External Digital Modulation" on page 118.
A maximum of 5 V can be applied as an external voltage to the Input Trigger
connector, see page 152.
Take care not to use the Trigger Output connector or the Remote Interlock
connector for modulation. Do not apply an external voltage to these
connectors.
If external digital modulation using the Input Trigger Connector,
<B
>, is chosen as the modulation source, [M
ACKPLANE
HP 81689A Tunable Laser module behaves differently from all other
modules. If the duty cycle varies:
• the average power of the output signal of the HP 81689A Tunable
Laser module varies in proportion with the change in duty cycle,
while,
• the power of the output signal of all other modules adjusts so that
the average power of the output signal is always 50% of the set power.
To enable external digital modulation using the Input Trigger
Connector:
1 Move to the Tunable Laser channel and press [Details].
2 Move to [M
3 Move to <B
E
. The text Back appears in the Tunable Laser channel.
NTER
How to Increase Linewidth
You can use coherence control to increase the linewidth of the
optical signal output from your Tunable Laser module.
Enabling the coherence control increases the linewidth of the
optical output signal to between 50 and 500 MHz (typically).
122
S
] and press E
OD
RC
NTER
>, by using the cursor key, and press
ACKPLANE
S
], the
OD
RC
.
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