Performance Assessment of Fuzzy Logic Control Routing Algorithm with Different Wavelength Assignments in DWDM Networks

Abstract

DWDM (Dense Wavelength Division Multiplexing) is an effective technique to make use of the large amount of bandwidth in optical fibers to meet the broadband requirement of multimedia applications. The routing and wavelength assignment (RWA) algorithm efficiently manages optical network resources and separated from the optical topology. This paper proposes a dynamic LLR algorithm using fuzzy logic control (FLC LLR) with different wavelength assignments. The unexpected traffic load is increased when the traffic load high and lightpath is long for the LLR routing algorithm. How to balance the traffic loads of each link and minimize the hop counts for each path is considered in this paper and the fuzzy logic control in FLC LLR algorithm is based on the traffic load and hop counts to determine the lightpath can be established or not. The simulation results show that the FLC LLR algorithm has better system performance than LLR algorithm in terms of connections setup, blocking probability, and channel utilization, especially for the traffic load is high. The number of conversions is compared as three wavelength assignments are embedded in FLC LLR algorithm when the converters are considered.