Exfo FTB-5600 Distributed PMD Analyzer Manuel d'utilisateur télécharger pdf (Page 131)

Optimizing Measurements

Distributed PMD Analyzer 125

Use an Appropriate Residual PMD for the Acquisition

Use an Appropriate Residual PMD for the

Acquisition

A residual PMD is designed where a limited small PMD value cannot be

measured properly. If you want to measure the PMD value on high PMD

sections over a few ps and are not interested in low PMD values, for

example <1 ps, then you should select a residual PMD that is just smaller

than 1 ps.

On the other hand, if you are interested in measuring PMD the value of few

hundreds fs, then you should set a residual PMD of less than 100 fs.

Note: An appropriately selected residual PMD can result in a lower acquisition

time.

More generally, if the PMD curve is very wavy and at the same level as the

PMD resolution, then it is the sign of a bad PMD scale. It should be set to a

lower value.

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Exfo FTB-5600 Distributed PMD Analyzer Manuel d'utilisateur Page 131