Abstract
This paper proposes a hierarchical optical path network design algorithm
employing dedicated protection in the waveband layer. The proposed algorithm
reduces network costs by joint optimization of grooming wavelength paths and
placing waveband paths as well as ensures network survivability. It realizes
node and link disjoint protection based on the observation that a pair of
primary and backup waveband paths forms a loop. The algorithm attains high
waveband utilization rates by employing the newly developed concept of a
concatenated loop chain, which consists of a series of waveband paths.
Analyses demonstrate that the proposed algorithm is superior to not only the
simple End-to-End method but also the single layer optical path networks
that employ wavelength path protection. The results also show that reliable
hierarchical optical path networks offering waveband protection can be
realized with marginal cost increase from unprotected single layer optical
path networks.
© 2009 IEEE
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