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Proceedings Paper

Algorithm for placement of limited wavelength conversion in WDM optical networks
Author(s): Mounire El Houmaidi; Mostafa Bassiouni; Guifang Li
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Paper Abstract

Equipping all nodes of a large optical network with full conversion capability is prohibitively costly. To improve performance at reduced cost, sparse converter placement algorithms are used to select a subset of nodes for full-conversion deployment. Further cost reduction can be obtained by deploying only limited conversion capability in the selected nodes. In this paper, we present limited wavelength converters placement algorithm based on the k-Minimum Dominating Set (k-MDS) concept. We propose three different cost effective optical switch designs using the technologically feasible non-tunable optical multiplexers. These three switch designs are Flexible Node-Sharing, Strict Node-Sharing and Static Mapping. Compared to the full search heuristic of O(N3) complexity based on ranking nodes by blocking percentages, our algorithm on one hand has a better time complexity O(R.N2) - R is the number of disjoint sets provided by k-MDS; and on the other hand avoids the local minimum problem. The performance benefit of our algorithm is demonstrated by network simulation with the U.S Long Haul topology having 28 nodes (R is 5). From the optical network management point of view, our results also show that the limited conversion capability can achieve performance very close to that of the full conversion capability; while not only decreasing the optical switch cost but also enhancing its fault tolerance.

Paper Details

Date Published: 19 August 2003
PDF: 11 pages
Proc. SPIE 5247, Optical Transmission Systems and Equipment for WDM Networking II, (19 August 2003); doi: 10.1117/12.509993
Show Author Affiliations
Mounire El Houmaidi, Univ. of Central Florida (United States)
Mostafa Bassiouni, Univ. of Central Florida (United States)
Guifang Li, Univ. of Central Florida (United States)

Published in SPIE Proceedings Vol. 5247:
Optical Transmission Systems and Equipment for WDM Networking II
Benjamin B. Dingel; Werner Weiershausen; Achyut K. Dutta; Ken-Ichi Sato, Editor(s)

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