Abstract
Wavelength converters reduce the connection blocking probability in
wavelength-routed networks by eliminating the wavelength continuity constraint. We
develop a method for deployment of wavelength converters in wavelength-routed networks
with an overlay model. In these networks, most wavelength converters are deployed on
edge nodes to cover the difference in the numbers of wavelengths multiplexed on access
and core links. Therefore reduction of wavelength converter cost on edge nodes leads to
minimizing the wavelength converter cost in the whole network. We propose an ingress
edge node architecture with fixed wavelength converters that have limited wavelength
convertibility but are more economical than full wavelength converters. In our
architecture, each input access link of ingress edge nodes is equipped with fixed
wavelength converters, and input wavelengths from the access links are evenly
distributed on the output core link. As a result, competition for a free wavelength on
an output core link is avoided. Simulation results show that our edge node architecture
offers about 20% cost reduction compared with a node architecture that uses only full
wavelength converters where networks are actually under operation and a full wavelength
converter cost to fixed wavelength converter cost ratio is 3:1.
© 2006 Optical Society of America
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