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I think Polarization Mode Dispersion is a form of modal dispersion.

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Posted by HamidAliKhan

PMD is a form of modal dispersion

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Posted by Hash007

You both do not give the actuall answer.
waiting.....

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Posted by waqqas1

PMD needs to be addressed for systems operating at 10 Gbps, OC-192 or STM-64 and higher.

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Posted by dandelo

Polarization Mode Dispersion (PMD) is a serious problem that can limit distances so it should be
addressed for systems which are operating at 10 Gbps, OC-192 or STM-64 and higher.

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Posted by sagitraz