Multiwavelength Optical Networks: A Layered Approach
Multiwavelength Optical Networks: A Layered Approach
Efficient Distributed Control Protocols for WDM All-Optical Networks
IC3N '97 Proceedings of the 6th International Conference on Computer Communications and Networks
Optical layer survivability: a services perspective
IEEE Communications Magazine
Generalized multiprotocol label switching: an overview of routing and management enhancements
IEEE Communications Magazine
IEEE Communications Magazine
Optical layer survivability-an implementation perspective
IEEE Journal on Selected Areas in Communications
Survivability in optical networks
IEEE Network: The Magazine of Global Internetworking
Information Sciences: an International Journal
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This paper investigates the performance of various schemes for restoration of lightpaths in an optical mesh network. We consider schemes in which backup paths for links or paths are pro-computed, but wavelength assignment is either pro-computed (static) or done dynamically upon failure (dynamic). In static restoration we compare the performance of link and path restoration in terms of capacity requirement and restoration time. For the dynamic restoration, we consider several dynamic wavelength reservation schemes such as backward and forward reservation with different portion of wavelength to be reserved in both directions. Their performance is evaluated in terms of restoration speed and restorability. Simulation results indicate that path protection requires less capacity than link protection for 100% restorability, and dynamic restoration with backward wavelength reservation shows better restorability than static restoration schemes, when the extra capacity is relatively small. Forward wavelength reservation shows faster restoration speed with lower restorability than the backward wavelength reservation. In general, the optimal restoration scheme depends on extra capacity available and restoration time limit.