Abstract
Service providers operating dense-wavelength-division-multiplexed networks are often faced with the problem of
designing their networks such that a certain level of service availability can be delivered to their customers. This
paper introduces optimization-based algorithms that address this problem efficiently and effectively. For a given
network topology, specified by existing dark-fiber links, our algorithms determine a cost-effective solution
consisting of the size and location of equipment needed to satisfy the desired amount of point-to-point traffic
demands. In addition, the solution approach discussed in this paper delivers estimates for the service
unavailability probability of each traffic-demand pair and enables the service provider to programmatically
determine which and how many supplemental node-disjoint protection paths are required in order to attain a
prespecified demand-pair unavailability target. To the best of our knowledge, these algorithms provide the user with
the most detailed design created by any optimization-based design tool to date. The efficiency and effectiveness of
the proposed network-design algorithms is studied using an empirical analysis.
© 2007 IEEE
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