NKT Photonics Koheras ADJUSTIK, Product Manual

Page: 70 / 105

CONTROL settings
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length up or down when the DC-voltage varies either positive or negative re -
spectively. The speed of wavelength tuning is set with the Integrating update
interval.
Modulation Range
For X15 lasers, you can use the Modulation Range drop-down menu to set the
modulation range to either narrow or wide.
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 38 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 Wav 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 lasers 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 Wav/- pins. Increasing the gain will directly increase the
wavelength modulation achievable with the signal.