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Decrease of the Link PMD by Fiber Exchange and Investigation of the PMD Distribution along Buried Optical Fibers with a POTDR

The accumulated PMD along several fibers in an optical network was measured in order to identify those short fiber portions exhibiting high PMD. By replacing high-PMD-portion(s) in each fiber, the overall-PMD could be reduced significantly. Additionally the PMDaccumulation of different fibers in the same buried cable was investigated and compared to each other.