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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 achieve up to 20% resource efficiency improvement...
We propose wavelength defragmentation solutions with minimum optical path disruptions. The new approaches achieve up to 20% resource efficiency improvement with less than one fourth of disruptions compared to the conventional approach.
A “living network” is demonstrated, that, unlike today's static planning, adapts to varying network conditions, and allows operation close to performance limits. An autonomously operating test-bed shows feasibility with an allocated margin of only 1.5 dB.
We evaluate the contribution of “adaptive modulation” to cost reduction in traffic grooming-capable optical networks. We demonstrate up to 25% optical line reduction with adaptive modulation for large networks carrying traffic of hundreds of terabits/s.
We demonstrate novel re-optimization design techniques for realizing agile and seamless service migration with minimum connection disruptions. We also show the effectiveness of our integer linear programming based approach through network simulations.
We demonstrate more than threefold increase of “effective capacity” by defragmentation in a realistic elastic network. Through diversified analysis, we also confirm that two simple indices, High-slot-Mark and Utilization-Entropy, represent wavelength fragmentation conditions well.
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 improves link utilization, it sometimes increases...
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