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This paper proposes a methodology to evaluate the total cost (CapEx and OpEx) of a migration process from a capacity-exhausted static WDM network to different capacity-upgraded alternatives. The methodology has been applied for evaluating and comparing two migration alternatives: maintaining static operation at increased bit rate and changing to dynamic(More)
Greedy spectrum allocation algorithms assign the required number of slots to a connection request as long as there are enough contiguous slots available for it. Instead, a deadlock-avoidance algorithm only assigns slots if future connections can be fit in the spectrum void left after assigning the current connection. That is, a deadlock-avoidance algorithm(More)
To date, most resource allocation proposals in elastic optical networks have focused either on routing and spectrum assignment (RSA, assuming fixed coding scheme and modulation format) or routing, modulation level and spectrum assignment (RMLSA, assuming a fixed coding scheme). Recent research has studied the impact of adaptive assignment of the code rate,(More)
Current fixed grid DWDM networks are expected to be insufficient to accommodate expected demands in few years. Hence, operators need to compare different alternatives to cope with future demands. This paper presents a step-by-step techno-economic methodology to compare and identify the most convenient upgrade alternative(s). One of the possible migration(More)
A new algorithm for dynamic network virtualization over flexible-grid networks is proposed. The algorithm, called Hamming-Fit, aims to map each request in a zone of the physical network resembling as much as possible the topology of the virtual network (sub-graph mapping). To do so, every possible node set (with as many nodes as the virtual network) of the(More)
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