Abstract
Physical layer impairments accumulate as light propagates through a
lightpath in the transparent optical networks. Therefore, it is possible to
provision a lightpath, while its quality of transmission (QoT) does not meet
the required threshold. Considering the physical layer impairments in the
network planning phase gives rise to a set of offline Impairments Aware
Routing and Wavelength Assignment (IA-RWA) algorithms. There are very few
offline IA-RWA algorithms that consider dedicated path protection demands.
In this work we propose a novel offline IA-RWA algorithm, called Rahyab and
perform a comparative performance evaluation study, which considers two
enhanced algorithms from the literature. Simulation results indicates that
demand pre-processing, diverse routing, and adaptive wavelength assignment
are the main reasons of lower blocking rate of Rahyab algorithm compared to
the selected algorithms.
© 2010 IEEE
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