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Only a few years ago, Getting significant when high-speed fiber-optic digital communication systems came to play, such as the 40Gbit/s systems, the potential effects of polarization mode dispersion occurs. In magnitude, Polarization mode dispersion (PMD) with polarization maintaining circulator is smaller than other types of dispersions, but at least until now, it is tougher to compensate for. With data rates higher than 2.5Gbit/s, PMD becomes a problem in systems. To sending higher data rates, PMD makes more challenges over a long distance.
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