Abstract
We propose a new wavelength assignment scheme that improves the blocking
probability of WDM networks that use limited-range wavelength converters.
Limited-range wavelength converters are attractive for wavelength-routed networks,
given current technology, since they offer good utilization of the wavelength
resource and improved blocking probability. However, their conversion ranges
are limited; the maximum difference between the input and the
output wavelengths is restricted. Thus we must take into account the existence
of these limited-range wavelength converters. In our proposed scheme, each
connection request is assigned a different wavelength according to its hop
number. We tend to use different wavelengths for connection requests with
different hop numbers. As a result, we can reduce the blocking probability
by two decades compared with simply assigning the shortest available wavelengths.
In addition, the scheme allows the number of wavelength converters used in
each node to be reduced with almost no degradation in blocking probability.
Simulation results show that the proposed scheme can reduce the wavelength
converters by about 20% on the simple ring network and by 37.5% on the 14-node
NSFNet network.
© 2006 Optical Society of America
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