Sparsely Placement of Electronic Switching Nodes for Low Blocking in Translucent Optical Networks
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ABSTRACT:
We evaluate the performance of optical network designs using relatively few switch nodes at which wavelength conversion and electronic regeneration is possible. A simple
heuristic for placing the fewest such nodes to reach a given blocking probability is based on the ranked frequency of shortest-path routes transiting each node. This strategy is found to be efficient in designing a “translucent” optical network with sparse electronic switch placement that performs very close in blocking to that of an “opaque” optical network. In addition, we apply a new 2-D Dijkstra’s
algorithm for routing and wavelength assignment in the resultant translucent optical network. Simulation results indicate that a translucent optical network with sparse electronic switch placement based on the heuristic has much lower blocking than a fully transparent optical network when the constraint of the maximum transparent distance before regeneration is also considered. Moreover by placing the switches according to the heuristic, lightpath blocking can approach that of a fully opaque network with significantly fewer electronic switches in total. In our results, lightpath blocking as low as the fully opaque network case was obtained with electronic switches selectively placed at approximately 1 node in 3 on average. The heuristic also performs well against random searching for an effective subset of electronic switch nodes and performs better than a prior optimal method based on combinatorially exhaustive search, and which is limited to assuming fixed shortest path routing.
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STATISTICS
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