It is known that multicast provisioning is important for supporting cloud-based applications, and as the traffics from these applications are increasing quickly, we may rely on optical networks to realize high-throughput multicast. Meanwhile, the flexible-grid elastic optical networks (EONs) achieve agile access to the massive bandwidth in optical fibers, and hence can provision variable bandwidths to adapt to the dynamic demands from the cloud-based applications. In this paper, we consider all-optical multicast in EONs in a practical manner and focus on designing impairment- and splitting-aware multicast provisioning schemes. We first study the procedure of adaptive modulation selection for a light-tree, and point out that the multicast scheme in EONs is fundamentally different from that in the fixed-grid wavelength-division multiplexing networks. Then, we formulate the problem of impairment- and splitting-aware routing, modulation and spectrum assignment (ISa-RMSA) for all-optical multicast in EONs and analyze its hardness. Next, we analyze the advantages brought by the flexibility of routing structures and discuss the ISa-RMSA schemes based on light-trees and light-forests. This paper suggests that for ISa-RMSA, the light-forest-based approach can use less bandwidth than the light-tree-based one, while still satisfying the quality of transmission requirement. Therefore, we establish the minimum light-forest problem for optimizing a light-forest in ISa-RMSA. Finally, we design several time-efficient ISa-RMSA algorithms, and prove that one of them can solve the minimum light-forest problem with a fixed approximation ratio.

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optimizing a lightforest routing structures approximation ratio minimum lightforest problem highthroughput massive bandwidth impairment and splittingaware routing modulation and spectrum assignment isarmsa variable bandwidths lighttreebased one lighttree timeefficient isarmsa algorithms lightforestbased approach lighttrees fixedgrid wavelengthdivision multiplexing networks elastic optical networks cloudbased applications lightforests adaptive modulation selection

Zuqing Zhu,.Impairment- and Splitting-Aware Cloud-Ready Multicast Provisioning in Elastic Optical Networks. 25 (2),1220-1234.

Zuqing Zhu,"Impairment- and Splitting-Aware Cloud-Ready Multicast Provisioning in Elastic Optical Networks" 25

Zuqing Zhu,"Impairment- and Splitting-Aware Cloud-Ready Multicast Provisioning in Elastic Optical Networks"