A Reliable Fault Resilience Scheme

The reliability has become an important and challenging issue in practical use of optical networks. This chapter introduces a reliable fault resilience scheme to improve the network reliability. In the introduced scheme, established lightpaths are protected using the reliable shared protection tree to provide higher reliability. This protection tree is constructed by restricted sharing of a wavelength in the sub branch of the tree. In the reliable shared protection tree, any two different end-to-end routes from the root node to leaf nodes sharing at least one link are allocated with different wavelengths. The backup paths on the same end-to-end route share the same wavelength among themselves in order to save the resource usages. Simulation results show that the introduced scheme tradeoffs between network reliability and blocking probability.

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