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Protected working lightpath envelope (PWLE) is a promising path-oriented protection strategy developed by us to provision survivable services for dynamic traffic. Partitioning the network capacity into a working layer and a protection layer by means of lightpath-protecting p-cycles, PWLE possesses the advantages of high capacity efficiency, avoidance of wavelength conversion, good blocking performance...
This paper evaluates the balance between the cost of multifibres and the cost of wavelength converters in multilayer networks. A novel ILP formulation of the static planning problem is applied.
We consider the reconfiguration problem in multi- fiber WDM optical networks. In a network with evolving traffic, the virtual topology may not remain optimal, leading to degradation of network performance. However, adapting the virtual topology to the changing traffic may lead to service disruption. This optimization problem hence captures the trade-off between network performance and number of reconfigurations...
This letter addresses the problem of determining virtual topologies in wavelength-routed WDM optical networks. To solve this problem, it is necessary to determine the set of lightpaths which comprise the virtual topology. Packet-switched traffic is then routed over this set of lightpaths, completely independent of the physical topology. Common objectives include minimizing congestion or packet hop...
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