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Power-efficient design and management of wavelength-routed optical networks

Maher Adnan Ali, University of Nebraska - Lincoln


We consider wavelength-routed networks which allow the establishment of lightpaths and light-trees. Realization of multicast connections in such networks require the use of power splitters and optical amplifiers. Recently proposed photonic switches suffer from excessive and indiscriminate power loss and are difficult and expensive to fabricate. ^ We present the power-efficient design space and discuss the impact of power on the overall design of all-optical networks. Novel switches on this design space along with routing algorithms are presented. Experimental results show that the new power-aware switches provide substantial savings in cost over existing designs with minimal effect on the blocking performance. ^ Motivated by the power-efficient design space, we address the problem of allocating multicast nodes in all-optical networks. First, we show that this problem is NP-complete even in its graph-theoretic version. Then, we develop different heuristics employing greedy, genetic, and simulated annealing approaches. Experimental results on the high-speed Italian network as well as randomly generated topologies demonstrate that (i) no more than 50% of the switches need to be multicast-capable and (ii) the proposed simulated annealing heuristic provides fast near-optimal solutions compared to the long time required to find the optimal solution using branch and bound techniques or the inferior solution quality of the greedy algorithm. ^ We consider the problem of routing and wavelength assignment (RWA) while maintaining a valid power level for each signal. Erbium-doped fiber amplifiers (EDFAs) are used to compensate for power loss. The gain saturation in EDFA greatly adds to the complexity of the RWA problem. Therefore, different heuristics based on greedy approach and genetic algorithms are used. ^

Subject Area

Engineering, Electronics and Electrical|Computer Science

Recommended Citation

Ali, Maher Adnan, "Power-efficient design and management of wavelength-routed optical networks" (2000). ETD collection for University of Nebraska - Lincoln. AAI9973584.