Tunable Lasers How to Modulate a Signal
124 Agilent 8163A Lightwave Multimeter, Agilent 8164A Lightwave Measurement
System, & Agilent 8166A Lightwave Multichannel System, Fourth Edition
1 Move to the Tunable Laser channel and press [Details].
2 Move to [Mod Src] and press Enter.
3 Move to <Backplane>, by using the cursor key, and press Enter. The text
Back appears in the Tunable Laser channel.
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). 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 120.
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].
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