How to Use Laser Source Modules Laser Sources
Agilent 8163A/B, 8164A/B & 8166A/B Mainframes, Sixth Edition 115
How to Modulate Dual-Wavelength Laser Source
Modules
To modulate the lower wavelength source at 100 kHz using internal
modulation and the upper wavelength source using coherence control for
a Dual-Wavelength Laser Source module:
1 Move to the laser source channel and press the [Details] softkey.
2 Move to [λ] parameter and press Enter.
3 Select the lower wavelength source, for example, <1309.6>, using the cursor
key, and press Enter.
4 Move to the [Mod Frq] parameter for the lower wavelength source and press
Enter.
5 Enter 100.000 and press Enter.
6 Move to the [Mod Src] parameter for the lower wavelength source and press
Enter.
7 Move to <Internal>, by using the cursor key, and press Enter. The text Mod
appears in the Laser Source channel.
8 Move to the [Mod Src] parameter for the upper wavelength source and press
Enter.
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.
NOTE
If you choose to output both wavelengths of the 81554SM Dual-
Wavelength Laser Source and to modulate the optical output signal, the
two signals may be 180° out of phase with each other.
For Agilent 8165x Series Dual-Wavelength Laser Source modules, you can
choose independent modulation sources and independent modulation
frequencies for both wavelengths.
If you choose independent modulation sources for a Dual-Wavelength
Laser Source module, the text Mod will be displayed in the Laser Source
channel.
If you choose the same modulation sources for both wavelengths of a
Dual-Wavelength Laser Source module, the relevant text will be displayed
in the Laser Source channel, for example, Int if both wavelengths use
internal modulation.
NOTE
NOTE
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