We investigate the statistical correlation between first-and second-order polarization mode dispersion (PMD) effects, which is important for PMD mitigation. The theoretical results are compared to numerical simulations and experimental data from a real high-PMD fiber. A new dependence between first-and second-order PMD is found. We show that the root mean square (rms) value of the second-order PMD component, perpendicular to PMD vector, increases with the length of the PMD vector.
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