A novel online monitoring and protection scheme based on Optical Time-Domain Reflectometer (OTDR) and optical switches is proposed. In the experiment, online monitoring as well as the protection of feeder fiber can be achieved.
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P. J. Urban, S. Dahlfort. OTM- and OTDR-based cost-efficient fiber fault identification and localization in passive optical network. Optical Fiber Communication Conference and Exposition (OFC/ NFOEC) and the National Fiber Optic Engineers Conference, 2011: 1-3.