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Internet traffic demands are constantly increasing and a considerable amount is expected to be of multicast type. Optical Transport Networks (OTN) must be prepared in terms of better resource utilization, for accommodating unicast and multicast traffic together. Dynamic traffic grooming in optical mesh networks is one of the most important and practical problems for designing Wavelength Division Multiplexing (WDM) based networks. Light-trees have been proposed for supporting multicast connections in OTN. Nevertheless when Traffic Grooming is applied in light-trees, resources can be underutilized as traffic can be routed to undesirable destinations in order to avoid Optical-Electrical-Optical (OEO) conversions.
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