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~Polarization Mode Dispersion (PMD)
is a result of the phenomenon occurring in the single-mode optical fibers, consisting of the propagation two orthogonally polarized modes of the relative to each other. The group velocity of these modes are different (not maintain the circular symmetry of the fiber refractive index profile, stress).
~Power Supply System
a device or system of devices with the task of ensuring uninterrupted supply of electricity at the site.
