NKT Koheras BASIK - Figure 29 Wavelength Modulation - both; Figure 30 Internal Generator Waveform Selection (Type)

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CONTROL settings

Figure 29 Wavelength modulation - both

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 30 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

coupling. Refer to “Wavelength modulation coupling” on page 40 for further

information.

Note: When using wavelength modulation with an X15 module, and the Modula-

tion range parameter is set to Narrow, the modulation signal will be AC-coupled

and the DC-component enters a software integrating function that tunes the

wavelength up or down when the DC-voltage varies either positive or negative

respectively. The speed of wavelength tuning is set with the Integrating update

interval.

Modulation Range

For X15 modules, you can use the Modulation Range drop-down menu to set the

modulation range to either narrow or wide.