Design and provisioning of WDM networks for traffic grooming

Wavelength Division Multiplexing (WDM) is the most viable technique for utilizing the enormous amounts of bandwidth inherently available in optical fibers. However, the bandwidth offered by a single wavelength in WDM networks is on the order of tens of Gigabits per second, while most of the applications\u27 bandwidth requirements are still subwavelength. Therefore, cost-effective design and provisioning of WDM networks require that traffic from different sessions share bandwidth of a single wavelength by employing electronic multiplexing at higher layers. This is known as traffic grooming. Optical networks supporting traffic grooming are usually designed in a way such that the cost of the higher layer equipment used to support a given traffic matrix is reduced. In this thesis, we propose a number of optimal and heuristic solutions for the design and provisioning of optical networks for traffic grooming with an objective of network cost reduction. In doing so, we address several practical issues. Specifically, we address the design and provisioning of WDM networks on unidirectional and bidirectional rings for arbitrary unicast traffic grooming, and on mesh topologies for arbitrary multipoint traffic grooming. In multipoint traffic grooming, we address both multicast and many-to-one traffic grooming problems. We provide a unified frame work for optimal and approximate network dimensioning and channel provisioning for the generic multicast traffic grooming problem, as well as some variants of the problem. For many-to-one traffic grooming we propose optimal as well as heuristic solutions. Optimal formulations which are inherently non-linear are mapped to an optimal linear formulation. In the heuristic solutions, we employ different problem specific search strategies to explore the solution space. We provide a number of experimental results to show the efficacy of our proposed techniques for the traffic grooming problem in WDM networks

Lightpath routing with survivability requirements in WDM optical mesh networks

Ph.DDOCTOR OF PHILOSOPH

Layout aware router design and optimization for Wavelength-Routed Optical NoCs

Optical Networks-on-Chip are a promising solution for high-performance multi-core integration with better latency and bandwidth than traditional Electrical NoCs. Wavelength-routed ONoCs offer yet additional performance guarantees. However, WRONoC design presents new EDA challenges which have not yet been fully addressed. So far, most topology analysis is abstract, i.e., overlooks layout concerns, while for layout the tools available perform P&R but no topology optimization. Thus, a need arises for a novel optimization method combining both aspects of WRONoC design. In this thesis such a method is proposed and compared to the state of the art design procedure. Results available so far show a remarkable 50% reduction in maximum insertion loss with this new approach

Design of Disaster-Resilient Datacenter WDM Networks

Survivability of data in datacenters, when a fault occurs, is turning into an upcoming challenge in planning cloud-based applications. At the point when such a disaster happens, a particular geological range is disrupted, and units of transmission systems (e.g., nodes and fibers) within the disrupted region end up faulty, leading to the loss of one or more demands. To deal with such a circumstance, a resilient communication code is required, so arrangements can be made to accommodate an alternative disaster-free path when a fault upsets the path utilized for data requests before the failure happens. In this work, we have shown a new approach to deal with this issue, on account of the static Route and Wavelength Assignment (RWA) in Wavelength Division Multiplexing (WDM) systems. In our approach, a set of communication demands can be handled only if it is feasible to i) Find the datacenter node ii) a primary lightpath that minimizes the effect of disasters that may disrupt lightpaths and iii) (for every disaster that upsets the primary lightpath), a backup lightpath that handles the disaster. We have presented, implemented and examined an efficient heuristic to solve this issue

Framework For Performance Analysis of Optical Circuit Switched Network Planning Algorithms

Projecte final de carrera realitzat en col.laboració amb Ecole Polytechnique Fédérale de Lausann