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Routing, modulation level and spectrum allocation with dynamic modulation level conversion in elastic optical networks

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Abstract

Elastic optical network is introduced as a promising technology to provide multi-bitrate-friendly data transmission in the optical layer. Elastic optical networks are based on flexible modulation format conversion, which can make more efficient use of spectrum resources than current fix-grid WDM networks. In this paper, we define the routing, modulation level and spectrum resource allocation (RMLSA) problem and then propose two novel dynamic modulation level conversion (MLC) enabled RMLSA algorithms. Numerical simulations are conducted to compare the performance of the path modulation level conversion (Path-MLC) and link modulation level conversion (Link-MLC) with different MLC thresholds with K-shortest paths RSA in terms of blocking rate, occupied spectrum and the number of MLCs across two topologies. The results verify that the Link-MLC with unlimited MLC achieves the lowest blocking rate and moderate spectrum utilization at the expense of intermediate node modulation conversions in two topologies. Smaller MLC threshold has higher blocking rate and occupied less spectrum resource. The results also suggest that the Path-MLC approach is more resource efficient than the Link-MLC with relatively higher blocking rate, and this method maybe more preferable in the networks with tight budget and/or energy constraints.

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Acknowledgments

This study is supported by 863 Program No. 2012AA011302, 973 Programs No. 2012CB315604, Beijing Municipal Education Commission Science and Technical Programs \(KM201110009001\). It is also supported by China NSFC Project 61201260, China 863 Project 2012AA011301.

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Correspondence to Hui Ding.

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Ding, H., Zhang, M., Ramamurthy, B. et al. Routing, modulation level and spectrum allocation with dynamic modulation level conversion in elastic optical networks. Photon Netw Commun 28, 295–305 (2014). https://doi.org/10.1007/s11107-014-0453-3

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  • DOI: https://doi.org/10.1007/s11107-014-0453-3

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