For decades, optical networks have provided larger bandwidth than it could be utilized but, with the increasing growth of the global Internet traffic demand, new optical transmission technologies are required to provide much higher datarate per channel and to enable more flexibility in the allocation of traffic flows. Currently, researchers are investigating innovative transceiver architectures capable of dynamically adapting the modulation format to the transmission link properties. These transceivers are referred to as elastic and enable flexible allocation of optical bandwidth resources. To exploit their capabilities, the conventional fixed spectrum grid has to be evolved to provide a more scalable and flexible system that can use just as much spectral resources as requested to serve the client demand. The benefits of elastic transceivers with distance adaptive datarate have been evaluated in optical core networks, but their application to metro ring networks has still not been addressed: this paper proposes novel methods based on ILP and heuristic approaches to solve the Routing, Modulation Level and Spectrum Assignment problem in optical rings with elastic transceivers and rate-adaptive modulation formats. Moreover, we discuss how to analytically compute feasible solutions that provide useful upper bounds. Results show a significant reduction in terms of transceivers utilization and spectrum occupation.

Routing, Modulation Level and Spectrum Assignment in Optical Metro Ring Networks using Elastic Transceivers

ROTTONDI, CRISTINA EMMA MARGHERITA;TORNATORE, MASSIMO;PATTAVINA, ACHILLE;
2013

Abstract

For decades, optical networks have provided larger bandwidth than it could be utilized but, with the increasing growth of the global Internet traffic demand, new optical transmission technologies are required to provide much higher datarate per channel and to enable more flexibility in the allocation of traffic flows. Currently, researchers are investigating innovative transceiver architectures capable of dynamically adapting the modulation format to the transmission link properties. These transceivers are referred to as elastic and enable flexible allocation of optical bandwidth resources. To exploit their capabilities, the conventional fixed spectrum grid has to be evolved to provide a more scalable and flexible system that can use just as much spectral resources as requested to serve the client demand. The benefits of elastic transceivers with distance adaptive datarate have been evaluated in optical core networks, but their application to metro ring networks has still not been addressed: this paper proposes novel methods based on ILP and heuristic approaches to solve the Routing, Modulation Level and Spectrum Assignment problem in optical rings with elastic transceivers and rate-adaptive modulation formats. Moreover, we discuss how to analytically compute feasible solutions that provide useful upper bounds. Results show a significant reduction in terms of transceivers utilization and spectrum occupation.
Optical Metro Ring Networks; Fixed vs. Flexible Ggrid; Elastic Rate
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11311/739588
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