Yutaka Takita

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Switched optical transport networks (OTNs) and OTN-level shared mesh restoration (SMR) are promising technologies for improving the efficiency of the current OTN/WDM networks. In this paper, we present the evaluation results of OTN-level SMR in WDM networks. We focus on equipment cost, capacity utilization, and the value of sharing factor N in 1 : N(More)
Emerging applications require future elastic optical networks to provide dynamic and reconfigurable services while maintaining efficient usage of wavelength resources. In this paper, we propose integer linear programming (ILP)-based wavelength defragmentation solutions with minimal optical path disruptions during the migration process. The new approaches(More)
Shared protection/restoration is a promising solution for reducing protection resources and is supported at each layer of the current multi-layer networks. Software-defined networking is expected to reduce equipment cost as well as operational cost by orchestrating these shared protection functionalities. However, although protection resource sharing(More)
Provisioning of a pair of disjoint paths is crucial in WDM network planning and management in order to provide fault tolerant services. However, in networks with asymmetric nodes that have restrictions on the internal connections between outer links, existing methods for node-disjoint paths search have trap problems and require time consuming iterative(More)
Emerging applications require datacenter networks to provide dynamic and reconfigurable services in order to adapt to the dynamicity of cloud traffic, as well as to maintain the optimality of resource utilization. In this paper, we demonstrate novel re-optimization design techniques for realizing agile and seamless service. Our main contribution is a novel(More)
Emerging applications require networks to provide dynamic and reconfigurable services in order to efficiently use network resources for cost reduction. In this paper, we propose a novel integer linear programming (ILP) based approach for network reconfiguration to compute optimized routes for connections, and also to strategically migrate connections to(More)
Shared protection/restoration is a promising solution for reducing protection resources and is supported at each layer of the current multi-layer networks. Software-defined networking is expected to reduce equipment cost as well as operational cost by orchestrating these shared protection functionalities. However, although protection resource sharing(More)
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