NKT Photonics Koheras ADJUSTIK HP, Product Manual

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CONTROL settings
You can connect an external signal to either the laser’s interface board
connectors as described in “Connecting modulation signals” on page 94 or
directly to the main electrical interface pins. The pin assignments are described
in Table 18 on page 105 . For information regarding example signal generation
circuits, refer to section “Fast wavelength modulation” on page 37
Figure 41 Wavelength modulation - internal source
Figure 42 Wavelength modulation - external source
Modulation Type (internal mode)
If the Modulation source is set to Internal , you can set the signal waveform type
that is generated internally. Click the Type drop-down menu arrow and select
either Sinusoidal , Triangle , Sawtooth or an Inverse sawtooth waveform.
Figure 43 Internal generator waveform selection (Type)
Modulation Coupling
You can select to couple the modulation signal using either AC or DC coupling.
Click on the Coupling drop-down menu arrow and select either AC or DC