Abstract-We present a hierarchical algorithm for grooming lightpaths into wavebands, and routing wavebands over a network of multigranular switching nodes. This algorithm focuses on lowering the number of wavelengths W and ports over the network while being conceptually simple, scalable, and consistent with the way networks are operated and controlled in practice. Our experiments indicate that this algorithm easily scales across different waveband and network sizes.
Abstract-We present a hierarchical algorithm for grooming lightpaths into wavebands, and routing wavebands over a network of multigranular switching nodes. Our approach is conceptually simple, scalable, and consistent with the way networks are operated and controlled in practice.I. INTRODUCTION Future optical networks are expected to carry traffic demands that range in size from sub-to super-wavelength. To ensure that resources are utilized efficiently, traffic demands must be aggregated and carried over the network in a costeffective manner. It has been recognized that combining multiple wavelengths into logical containers called "wavebands" can lead to a significant reduction in the number of optical switching ports in the network, since intermediate nodes only need a single port to switch a waveband. This observation has led to the development of multigranular optical crossconnects (MG-OXCs) which are capable of switching optical signals at a hierarchy of granularities: single wavelengths, single wavebands, or whole fibers. Multi-layer MG-OXCs consist of separate layers of cross-connects that switch traffic at the fiber (FXC), waveband (BXC), or wavelength (WXC) granularity. Single-layer MG-OXCs, on the other hand, consist of a unified layer which understands fibers, wavelengths and wavebands. Studies have concluded that single-layer MGOXCs provide greater reduction in switch size under a static traffic model, while multi-layer MG-OXCs provide lower blocking probability under a dynamic traffic model.With the availability of MG-OXCs, a new network design problem has emerged, namely, the problem of grooming wavelength demands onto wavebands and routing these wavebands over a multigranular optical network so as to minimize the number of optical switching ports. Most studies [1], [4] regard the network as a flat entity for the purposes of lightpath grooming, waveband routing, and wavelength assignment. It is well-known, however, that in existing networks, resources are typically managed and controlled in a hierarchical manner. In earlier research we developed a hierarchical approach to grooming sub-wavelength demands that emulates the hub-andspoke model used by the airline industry to "groom" passenger traffic onto connecting flights [2]. With the increase in the number of entities that need to be controlled, a hierarchical framework for managing wavebands is even more warranted in multigranular optical networks.
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