Getting Started With Return Loss Return Loss Measurement
Agilent 8163A/B, 8164A/B, and 8166A/B User’s Guide, Fourth Edition 151
If a return loss module with at least one internal source (such as the
Agilent 81611A, 81612A 81613A or 81614A) is not available, we
recommend that you use any of the following as part of your return
loss measurement setup:
• Agilent 83438A Erbium ASE Source.
This source offers a high-power low-coherence output that is very
stable over time.
• Laser Source modules.
See “Accessories” on page 297 for a list of modules that can be
installed in your mainframe. Refer to the note below that explains
the use of highly coherent light sources.
• Tunable Lasers, when you want to measure Return Loss over a
wavelength range.
See “Accessories” on page 297 for a list of modules that can be
installed in your mainframe. Refer to the note below that explains
the use of highly coherent light sources.
• LED sources.
The intensity of the output of LED sources is very stable over time,
although the low power output of LEDs restricts the dynamic range
of return loss measurement.
NOTE If you use high-coherence light sources, you can improve performance
by:
• modulating the output signal at 2 kHz or higher, or
• using coherence control to reduce the coherence length of the
signal.
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