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CONTROL settings
When set to “Narrow”, modulation depth is limited but the X15’s low phase noise
is maintained. To increase the modulation depth, change the range setting to
“Wide”. When the modulation range is set to “Wide”, phase noise will increase.
Note: Refer to “Narrow vs. Wide modulation range” on page 40 for further infor-
mation on configuring the modulation range.
Signal output
You can output the internal generator signal (internal modulation) from the
wavelength modulation pins of the laser. To output the signal from the pins, set
the Modulation type to “Internal” and the Signal output selector to Enabled. To
disable the signal output, set the Signal output drop-down menu to “Disabled”.
When multiple lasers are used, one laser can be used as a master signal
generator with the other lasers configured as slaves.
1. For all the lasers, connect the Wavelength+ pins together and the
Wavelength- pins together.
2. Designate one laser as the master by setting it to operate in “Internal”
modulation mode with the Signal output setting Enabled.
3. All other laser’s will operate in slave mode by setting them to operate in
“External” modulation mode.
Integrating update interval
You can set the update interval of the software integration function with this
setting. The setting is intended for use with X15 modules when they are set to DC
coupling and Narrow modulation range.
Internal generator Frequency
When the modulation source is set to Internal, the frequency of the internal
generator signal can be adjusted to between 8 mHz (0.008 Hz) and 100 kHz
(100,000 Hz). To adjust the frequency, use either the slider or the direct input
field in the upper right corner of the slider.
Narrow and Wide modulation gain
You can use this slider to increase the gain of an external modulation signal input
applied to the Wavelength+/- pins. Increasing the gain will directly increase the
wavelength modulation achievable with the signal.
Internal generator power Level
You can set the output power level of the internal function generator to between
0 and 100%. Use the slider or the field in the upper right corner of the Level slider
to adjust the modulation level.
Turning on wavelength modulation
To enable wavelength modulation, in the status panel lower right click the WL
mod button. The indicator next to the button turns ON green. Clicking the button
again once turns of the feature.
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