Detection of multiple failures in wavelength division multiplexed optical network using graph based light path restoration metho

摘要

In an Optical WDM network, link/path failure may occur in a very normal way which may cause a great amount of data loss if the link is not restored to reroute the affected traffic accurately and quickly using the redundancy the network. Wavelength Division Multiplexed (WDM) networks, employing wavelength routing have emerged as the dominant technology to satisfy this growing demand for bandwidth. As the amount of traffic carried has increased, any single failure can be catastrophic. Survivability becomes indispensable in such networks. Therefore, it is imperative to design networks that can quickly and efficiently recover from failures. Most research to date in survivable optical network design and operation focuses on single link failures, however, the occurrence of multiple-link failures are not uncommon in a network topology. Multi-link failure scenarios can arise out of two common situations. First, an arbitrary link may fail in the network, and before that link can be repaired, another link fails, thus creating a multi-link failure sequence. Secondly, it might happen in practice that two distinct physical links may be routed via the same common duct or physical channel. In our proposed method predefined cycles are used to survive a failure link. When a link fails at first its adjacent shorter cycle is used as its backup path. This can decrease the time complexity. Then these adjacent cycles are updated by using this restoration method can survive multiple link failures. This method theoretically ensures better performances than existing restoration method