OPGW (OPtical fiber composite overhead Ground Wire), which is used as communication lines for electric power companies, freezes and causes communication faults in winter season because of rainwater immersion into aluminum pipe (OP unit) which envelops optical fibers. Thus, effective detection methods of water immersion are needed. Hydrogen gas is generated when corrosion reaction of water and aluminum occurs, and causes optical transmission loss in wavelengths of 1.24/1.625 µm. This article argues about a water immersion detection method using 1.24/1.625 µm-OTDR (Optical Time Domain Reflectometer) and some experiments demonstrating increasing of hydrogen gas volume and optical transmission loss in real OP units.
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