NKT Photonics Koheras ADJUSTIK HP, Product Manual

Page: 77 / 115

77
CONTROL settings
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.
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.
Internal generator Offset
The offset of the internal modulation signal can be adjusted between -100 and
+100% dependent on the modulation level. For example, if the modulation level is
set to 40%, the offset can be adjusted between -60 and +60%. The sum of
modulation level and the absolute offset can be a maximum of 100%.
Integrating Update Interval
The integrating update interval sets the update interval for a software integrating
function. The function is only available on X15 systems with Coupling configured
as DC and Range set to Narrow .
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.
Figure 44 Turning on wavelength modulation
Amplitude
modulation
If the amplitude modulation option is included, you can modulate the output
power using an external signal or internal generator. Change the Source setting
in the Settings panel to External and connect a differential input signal to the
Amplitude modulation pins. See “Amplitude modulation” on page 44 and
“Interface Pin Assignments” on page 105 . To use the internal generator, see
“Internal amplitude modulation” on page 78 .
Figure 45 Power and current mode controls
Click to enable
modulation
wavelength