S. Datta and Z. Bogdanowicz (USA)
Rerouting, Re-optimization, Mesh Restoration
In an optical mesh network operation, lightpaths are setup when requested, without prior knowledge of future re quests. The concerns of increasing the sharing of backup paths and reducing capacity consumption are addressed on a best-of-now basis. As the number of lightpaths increases, it is possible to reroute existing paths to increase sharing further and free up more network capacity. This paper pro poses several rerouting algorithms and compares their per formance on test networks. All the described algorithms reroute the backup paths only and do not affect ongoing service. Also, the effect of network load factor and the number of lightpaths on the rerouting gain is examined.
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