NKT Photonics Koheras ADJUSTIK HP, Product Manual

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39
Fast wavelength modulation
Differential input
When configured as an input, the Wavelength +/- interface can be connected to a
differential signal with an amplitude up to 2x 5 Vpp as shown in
Figure 7
.
Figure 7 Differential input signal for wavelength modulation
Note: To prevent noise being induced that could create undesired phase noise, it
is recommended to disable the wavelength modulation setting when it is not in
use.
Single-ended to
differential
The circuit shown in
Figure 8
is an example of how to generate a differential
signal from a single-ended input. In this example, a 5 Vpp single-ended input
signal with a 0 V common-mode voltage generates a 2x 5 Vpp differential signal
with a 2.5 V common mode voltage.
Figure 8 Single-ended to differential
Singled-ended
input
If a differential signal is not available, a single-ended signal as shown in
Figure 9
can be applied to the Wavelength + input. In this case, connect Wavelength - to