Abstract
Given a physical network topology and a traffic demand, the problem of designing
a survivable network with path protection is to select primary and backup paths based on
resource optimization. A common approach to minimize resources is sharing. This problem
has been investigated with the goal of optimizing the number of channels (i.e.,
wavelengths) needed for backup paths by imposing capacity sharing. However, because of
the need and the cost for other devices, such as opto-electro-opto (OEO) regenerators,
network provisioning should also take into consideration such resources in the
optimization process. We address the problem of routing and wavelength assignment (RWA)
for survivable networks with the objective of simultaneously optimizing wavelength links
and OEOs. An integer linear program solution, a tabu search heuristic, and a genetic
algorithm are proposed, and their performance is experimentally evaluated through
extensive simulation. Our simulation results confirm an average of 30% reduction in the
number of OEOs compared to that required with the well known shared-path protection
scheme.
© 2006 Optical Society of America
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