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In wavelength-routed networks, wavelength conversionimproves lightpath blocking probability byeliminatingthe wavelength-continuity constraint. Because wavelengthconverters remain expensive in thenear future,we need a wavelength and converter assignment schemethat decreases blocking probabilitywith a limited numberof converters. In this paper, we propose a wavelengthand converter assignmentscheme for decreasing blockingprobability. Our scheme avoids contention among multiplelightpathrequests by making each node-pair to performwavelength conversion at different intermediate nodes withmore idle converters. Simulation results show that 1) ourscheme decreases blocking probability by aboutbetween44% and 83% and 2) our scheme needs one or two fewerwavelength converters per node toachieve near-optimalblocking probability compared with conventional scheme

A Wavelength and Converter Assignment Scheme using Converter Usage History in Wavelength-Routed Networks