Abstract
Wavelength-routed optical networks (WRONs) represent the most promising solution for the next generation high-capacity transport layer. Their feasibility critically depends on the number of wavelengths Nλ. required to satisfy a given traffic demand. This paper studies the allocation of active and restoration lightpaths in arbitrarily-connected WRONs and addresses the role played by the physical topology on Nλ. Wavelength interchange functionality in the optical cross-connects is also addressed. The results can be used in the analysis and optimisation of WRON design.
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