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EXFO FTB-5600 Distributed PMD Analyzer User Manual

Page 139

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Optimizing Measurements

Distributed PMD Analyzer

133

Use an Appropriate Spatial Smoothing Filter Value

If a 2000-m filter is applied to the curve, you can see a noticeable
improvement. The noise level is much lower, yet the PMD variations are
still there. This is the best filter value for such a trace.