Fault Tolerance in Passive Optical Networks: A Survey

Passive optical networks play an important role in fiber access system in the world today. Time division multiplexing-passive optical network is a fast emerging architecture that uses only passive components. In wavelength division multiplexing, passive optical network each light path can carry a huge amount of traffic failure may damage the end user applications. Hence fault tolerance has an important issue on this network. In a survey Studies many architectures, protocols and techniques to remove or overcome failures in the access network. Also in this survey study, methods for recovering from channel failures, link failures and node failures. In this paper we discussed the performance of the survey. Survivability is a critical issue in a wavelength division multiplexing optical networks.