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Wavelength converter placement under different RWA algorithms in wavelengthrouted alloptical networks
 IEEE Trans. Commun
, 2003
"... Abstract—Sparse wavelength conversion and appropriate routing and wavelength assignment (RWA) algorithms are the two key factors in improving the blocking performance in wavelengthrouted alloptical networks. It has been shown that the optimal placement of a limited number of wavelength converters ..."
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Abstract—Sparse wavelength conversion and appropriate routing and wavelength assignment (RWA) algorithms are the two key factors in improving the blocking performance in wavelengthrouted alloptical networks. It has been shown that the optimal placement of a limited number of wavelength converters in an arbitrary mesh network is an NPcomplete problem. There have been various heuristic algorithms proposed in the literature, in which most of them assume that a static routing and randomwavelength assignment RWA algorithm is employed. However, the existing work shows that fixedalternate routing and dynamic routing RWA algorithms can achieve much better blocking performance. Our study further demonstrates that the wavelength converter placement and RWA algorithms are closely related in the sense that a welldesigned wavelength converter placement mechanism for a particular RWA algorithm might not
A Tabu Search Algorithm for Sparse Placement of Wavelength Converters in Optical Networks ⋆
"... Abstract. In this paper, we study the problem of placing limited number of wavelength converting nodes in a multifiber network with static traffic demands and propose a tabu search based heuristic algorithm. The objective of the algorithm is to achieve the performance of full wavelength conversion ..."
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Abstract. In this paper, we study the problem of placing limited number of wavelength converting nodes in a multifiber network with static traffic demands and propose a tabu search based heuristic algorithm. The objective of the algorithm is to achieve the performance of full wavelength conversion in terms of minimizing the total number of fibers used in the network by placing minimum number of wavelength converting nodes. We also present a greedy algorithm and compare its performance with the tabu search algorithm. Finally, we present numerical results that demonstrate the high correlation between placing a wavelength converting node and the amount of transit traffic passing through that node. 1
Optimal wavelength converter placement in arbitrary topology wavelengthrouted networksq
, 2002
"... This paper describes an algorithm for optimally placing a given number of wavelength converters in alloptical networks with arbitrary topologies. We first introduce the simple network model upon which the algorithm is based. We provide a formulation of the overall network blocking probability when ..."
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This paper describes an algorithm for optimally placing a given number of wavelength converters in alloptical networks with arbitrary topologies. We first introduce the simple network model upon which the algorithm is based. We provide a formulation of the overall network blocking probability when a given number of nodes in the network, is provided with full wavelength conversion capability. We then present our optimal converter placement algorithm and illustrate its working using a simple example. The savings offered by our algorithm in the calculation of blocking performance are analyzed. The benefits of our optimal converter placement algorithm are studied through network examples such as the path, NSFnet and the meshtorus. Finally, some heuristics for converter placement are presented.
INFORMATION TO USERS
, 2001
"... Traffic grooming and wavelength conversion in optical networks ..."
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INFORMATION TO USERS
, 1996
"... Genetic construction and biochemical analysis of thermostability mutants of glucoamylase from Aspergillus awamori ..."
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Genetic construction and biochemical analysis of thermostability mutants of glucoamylase from Aspergillus awamori