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At 40 Gbit/s, polarization mode dispersion (PMD) proves more problematic than previously seen in lower speed networks. Second-order PMD, with CD-like impact, also has a considerable effect on network performance.
Only one test method is fully recommended and offers precise measurements of PMD in all network service provider environments: the generalized interferometric approach. The FTB-5500B PMD Analyzer employs this method for rapid testing.
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