Abstract
In this paper, we consider the problem of determining primary and backup paths for survivable optical
wavelength-division multiplexed mesh networks. We propose a distributed routing mechanism, which is called Least
Resource Consumption Routing, that tries to minimize the combined cost of the primary and the backup paths. The
proposed cost model includes the effect of various factors such as mean load, variance of the load on the route,
number of converters required by the route, and the length of the route. Further, we model the route cost in such a
way that it is extensible to include any new parameters and vary their relative importance. The performance studies
conducted for the 14-node National Science Foundation Network and a 30-node topology show that the proposed scheme
leads to significant improvements in blocking probability at low and moderate loads. Further, the proposed cost
model also reduces the number of converters required to obtain a target blocking performance as compared to some
other techniques proposed in the literature.
© 2007 IEEE
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