128 8163A/B, 8164A/B, 8166A/B User’s Guide
4 Laser Sources
How to Set the Frequency of a Modulated Signal
To set the frequency of the modulation to 6.500 kHz:
1 Move to the frequency parameter, [Mod Frq], press Enter.
2 Enter 6.500 press Enter.
How to Set the Modulation Mode
3 Move to the modulation source parameter, [Mod Src], and press Enter.
4Move to <Internal>, by using the cursor key, and press Enter. The text
Int appears in the Laser Source channel.
How to Increase Linewidth
You can use coherence control to increase the linewidth of the optical
signal output from your 8163A/B Series Laser Source module.
Enabling the coherence control increases the linewidth of the optical
output signal to between 50 and 500 MHz (typically). Coherence control
greatly reduces interference effects and therefore improves the power
stability in sensitive test setups.
To enable coherence control:
1 Move to the Laser Source channel and press [Details].
2Move to [Mod Src] and press Enter.
3Move to <Coherence Ctrl.>, Coherence Control, to increase linewidth.
For typical values, refer to User’s Guide for your laser source module,
among the Supplementary Performance Characteristics provided with the
module’s Specifications.
4Press Enter. The text CC appears in the Laser Source channel.
How to Modulate Dual-Wavelength Laser Source Modules
You cannot modulate both wavelengths of the 81554SM
Dual-Wavelength Laser Source module independently. If you select both
wavelength outputs using the [
λ] parameter, you can choose to
modulate both outputs at the same frequency or to output both outputs
as CW signals.
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