How to Modulate a Signal Tunable Lasers
Agilent 8163A/B, 8164A/B, and 8166A/B User’s Guide, Fourth Edition 139
Enabling the coherence control increases the linewidth of the optical
output signal to between 50 and 500 MHz (typically). Coherence
control greatly reduces interference effects and therefore improves the
power stability in sensitive test setups.
To enable coherence control:
1 Move to the Tunable Laser channel and press [Details].
2 Move to [Mod Src] and press E
NTER.
3 Move to <Coherence Ctrl.>, Coherence Control, to increase
linewidth to approximately 500 MHz.
4 Press Enter. The text CC appears in the Tunable Laser channel.
How to Set the Output Power of a Modulated Signal
All external modulation modes require you to set the output power. To
set the output power, see “How to Set the Output Power of a
Modulated Signal” on page 133.
How to Configure the Modulation Output
If your Tunable Laser module has a BNC output connector on its front
panel, to synchronize your external measuring equipment to the
modulation of the module:
1 Move to the Tunable Laser channel and press Menu.
How to Set the BNC Output Line Mode as a Modulation
Output
2 Move to <BNC Output> and press [OK].
3 Move to <Modulation>, by using the cursor key. A TTL-level signal is
output, if the optical output is digitally modulated, that is, if you
choose <Internal>, <External Digital>, or <Backplane> as the
chosen modulation source. The output signal has the same
frequency as the optical output.
4 Press [OK].
How to Set the Modulation Output Mode
5 Move to <Modout> and press [OK].
6 Move to either of the following two menu items, by using the cursor
key:
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