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A novel technique to monitor branched optical fibers is presented, based on the Brillouin analysis with end-reflected probe beams. The principle of the method is described and accompanying applications are discussed.
PNC-OFDR is tested in a field environment for the first time. A spatial resolution of 5 cm at 39.2 km is confirmed, which makes it possible to identify a high-birefringence section with a very short beat length.
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