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Tunable Laser Sources
How to Modulate a Signal
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 ENTER.
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 117.
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
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