Exfo FTB-5600 Distributed PMD Analyzer Manuel d'utilisateur télécharger pdf (Page 126)

Acquisition Data

120 FTB-5600

The FTB-5600 takes care of this issue: it automatically computes all of the

sampling steps required between the span provided. Only the value at the

end of the link (the PMD scale), and the minimum value desired (the

residual PMD) need to be set.

Note: The PMD sampling steps overlap by 3.

In the example below, the chosen scale is 8 ps and the residual PMD of

60 fs. We can see each scales with their saturation level and how they are

used to compute the overall PMD curve.

Scale (ps) Step (GHz) Residual PMD (ps) Saturation (ps)

8 12.5 1.6 19.4

2.67 37.5 0.533 6.5

0.889 112 0.178 2.15

0.296 337 0.06 0.7

Saturation at 6.5 ps

Saturation at 2.15 ps

Saturation at 0.7 ps

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Exfo FTB-5600 Distributed PMD Analyzer Manuel d'utilisateur Page 126