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This paper describes a practical technique and system design for isolating faults in an actually working optical fiber or optical transmission equipment in passive double star (PDS) networks which hav...e optical splitters located outside a central office. The fault-isolating system contributes to the reduction of the restoration time for optical PDS networks since the fault isolation enables maintenance engineers to know what to do first when repairing the networks. An optical time domain reflectometer (OTDR) with a high spatial resolution of 1 m and short wavelength pass filters (SWPF) for 1.6- μm region are key devices in the system. The reflection from the SWPF is observed by using the OTDR in the fault isolation. Since the OTDR owns the high resolvability, the OTDR trace can show the level and position of the peak due to the reflection from each SWPF in an optical PDS networks. In this paper, the practical requirements of the key devices are made clear for implementation of the fault isolation. Moreover, we show those proprieties resulting from employing our fault isolation system in a field experiment on new multimedia info-communication services in Japan.show more
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