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A practical approach for routing and wavelength assignment in large wavelength-routed optical networks

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2 Author(s)
D. Banerjee ; Dept. of Comput. Sci., California Univ., Davis, CA, USA ; B. Mukherjee

We consider large optical networks in which nodes employ wavelength-routing switches which enable the establishment of wavelength-division-multiplexed (WDM) channels, called lightpaths, between node pairs. We propose a practical approach to solve routing and wavelength assignment (RWA) of lightpaths in such networks. A large RWA problem is partitioned into several smaller subproblems, each of which may be solved independently and efficiently using well-known approximation techniques. A multicommodity flow formulation combined with randomized rounding is employed to calculate the routes for lightpaths. Wavelength assignments for lightpaths are performed based on graph-coloring techniques. Representative numerical examples indicate the accuracy of our algorithms

Published in:

IEEE Journal on Selected Areas in Communications  (Volume:14 ,  Issue: 5 )