Abstract
Feature Issue on
Next-Generation WDM Network Design and Routing (WDMN). We study
the problems of routing and wavelength converter placement in optical networks with
sparse wavelength conversion. We propose a new dynamic routing algorithm with two
new path cost functions based on the concept of least-load routing (LLR) with sparse
converter placement, and we discuss the application of genetic algorithms (GAs) to
determine the optimal location of wavelength converters so that the call-blocking
probability is minimized. Simulation results show that the proposed dynamic routing
algorithms perform significantly better than shortest-path (SP) routing and
fixed-alternative routing (FAR) in terms of the call-blocking probability. The GA
model is able to obtain a nearly optimal solution of the wavelength converter
placement problem within a reasonable time, and its performance is better than that
of two other popular heuristic placement algorithms.
© 2003 Optical Society of America
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