IEEE Communications Magazine
Adaptive modulation and MIMO coding for broadband wireless data networks
IEEE Communications Magazine
Dynamic routing and spectrum (re)allocation in future flexgrid optical networks
Computer Networks: The International Journal of Computer and Telecommunications Networking
Study on dynamic routing and spectrum assignment in bitrate flexible optical networks
Photonic Network Communications
Modeling the routing and spectrum allocation problem for flexgrid optical networks
Photonic Network Communications
ACO-based routing and spectrum allocation in flexible bandwidth networks
Photonic Network Communications
Spectrum-efficient optical drop-add-drop network with a centralized multi-carrier light source
Photonic Network Communications
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The rigid nature of current wavelength-routed optical networks brings limitations on network utilization efficiency. One limitation originates from mismatch of granularities between the client layer and the wavelength layer. The recently proposed spectrum-sliced elastic optical path network (SLICE) is expected to mitigate this problem by adaptively allocating spectral resources according to client traffic demands. This article discusses another limitation of the current optical networks associated with worst case design in terms of transmission performance. In order to address this problem, we present a concept of a novel adaptation scheme in SLICE called distance-adaptive spectrum resource allocation. In the presented scheme the minimum necessary spectral resource is adaptively allocated according to the end-to-end physical condition of an optical path. Modulation format and optical filter width are used as parameters to determine the necessary spectral resources to be allocated for an optical path. Evaluation of network utilization efficiency shows that distance-adaptive SLICE can save more than 45 percent of required spectrum resources for a 12-node ring network. Finally, we introduce the concept of a frequency slot to extend the current frequency grid standard, and discuss possible spectral resource designation schemes.