How to Use Laser Source Modules Laser Sources
Agilent 8163A Lightwave Multimeter, Agilent 8164A Lightwave Measurement System, & Agilent 8166A Lightwave
Multichannel System, Fourth Edition
97
2 Move to [Mod Src] and press Enter.
3 Move to <Coherence Ctrl.>, Coherence Control, to increase linewidth to
approximately 500 MHz, or move to <Low Freq. CC>, to increase linewidth to
approximately 50 MHz.
4 Press Enter. The text CC or LFCC appears in the Laser Source channel
depending on whether you selected <Coherence Ctrl.> or <Low Freq. CC> as
the modulation source.
How to Modulate Dual-Wavelength Laser Source
Modules
NOTE You cannot modulate both wavelengths of the HP 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 HP 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.
NOTE 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.
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.
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