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High First-Order Polarization Mode Dispersion (HiFO-PMD) sections are known to increase the overall First-Order PMD (FO-PMD) of an optical fibre link. Replacement of the HiFO-PMD regions with low-PMD fibres will drastically reduce the overall FOPMD of a fibre network link. In this paper, through simulation, the authors show that besides a HiFO-PMD section affecting the overall FO-PMD of a fibre link it also affects the overall Second-Order PMD (SO-PMD). The coupling angle between the other fibre sections making up a fibre link and the HiFO-PMD section determines whether first-order and second-order PMD can be introduced jointly or in isolation.
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