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Wavelength converters simplify the wavelength assignment problem in virtual topology design in optical networks and increase the utilization of the fiber bandwidth. However, converters are costly, and minimizing the number of converters needed to support a given level of functionality has been investigated in the literature in various contexts. In particular, previous work has addressed the problem...
Traffic grooming is known to be an inherently difficult problem. It has been shown to be NP-complete for path networks, a simple topology in which wavelength assignment is tractable. In this paper, we explore the borderline between tractability and intractability by considering grooming in unidirectional path networks in which all traffic requests are destined for a single egress node. It is an open...
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