Abstract
In this paper, we propose a novel network design algorithm that yields
the hierarchical optical path network with dedicated wavelength path protection.
A hierarchical optical path network provides two granularities in implementing
dedicated protection in the optical layer, namely waveband path protection
and wavelength path protection. The characteristics of both protection mechanisms
are investigated. We develop the concept of the source-destination Cartesian
product space to aggregate closely located traffic demands, which leads to
a significant reduction in network resources needed. The proposed wavelength
path protection algorithm achieves lower network costs than that possible
with waveband protection when traffic volume is relatively small. On the other
hand, in the large traffic demand area, both schemes offer almost the same
cost, which makes the waveband protection scheme attractive because of its
operational simplicity. Numerical results clarify that survivable hierarchical
optical path network is more cost effective than the single layer optical
path network with optical layer protection, irrespective of which protection
scheme is utilized.
© 2011 IEEE
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