Abstract
Transparent optical networks are the enabling infrastructure for converged
multi-granular networks in the Future Internet. The cross-layer planning of
these networks considers physical impairments in the network layer design.
This is complicated by the diversity of modulation formats, transmission rates,
amplification and compensation equipments, or deployed fiber links. Thereby,
the concept of Quality of Transmission (QoT) attempts to embrace the effects
of the physical layer impairments, to introduce them in a multi-criterium
optimization and planning process. This paper contributes in this field by
the proposal and comparative evaluation of two novel offline impairment aware
planning algorithms for transparent optical networks, which share a common
QoT evaluation function. The first algorithm is based on an iterative global
search driven by a set of binary integer linear programming formulations.
Heuristic techniques are included to limit the binary programming complexity.
The second algorithm performs different pre-orderings of the lightpath demand,
followed by a sequential processing of the lightpath demands. The performance
and the scalability of both approaches are investigated. Results reveal great
scalability properties of the global search algorithm, and a performance similar
to or better than the sequential schemes.
© 2009 IEEE
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