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Contribution to Flexible Optical Network Design: Spectrum Assignment and Protection

Abstract : The explosive growth of Internet traffic driven by proliferation of broadband services necessitates for a paradigm change in transport network. Introducing flexibility into optical layer has been considered as a guiding direction for improving network cost and energy efficiency. The traditional fixed network paradigm is therefore migrating to flexible one where a number of transmission parameters could be tuned and adapted to various network conditions. This changing paradigm clearly leverages new opportunities for addressing the very important problem, resiliency, in network design. On the other front, as the network becomes more flexible with an increasing number of degree of freedom, and consequently more complex, the role of algorithm in designing, operating and managing network has turn into of paramount importance when efficient algorithms are sought to achieve not just best use of resources but also to meet stricter requirement on running time and scalability issues. In this context, the works carried out in the thesis presents new protection schemes enabled by adaptive operation of flexible transponders, and new algorithms for solving the routing and spectrum assignment considering both single and multi-objective cases. Novel scientific contributions are presented into three following chapters: In chapter 2, the rate-adaptive operation with multi-line rate transponder for efficient protection is presented and benchmarked with traditional approach. The survivable network design with both dedicated and shared protection is formulated and investigated over extensive simulations to study the impact of introducing such new protection schemes in term of transponder count, cost and power consumption. Chapter 3 is dedicated to algorithms for solving the routing and spectrum assignment. In single-objective case, the novel algorithm based on genetic algorithm is proposed and benchmarked with other heuristics as well optimal solutions obtained from exact formulation. The contribution also includes the proposing of feeding good solutions from heuristic algorithms to warm-start the solvers. Afterwards, the multi-objective cases are examined extensively considering two scenarios whether or not the objective preferences is taken into account. Chapter 4 focuses on path protection in OFDM-based network considering novel scheme based on modulation-adaptive operation. The scheme is enabled by the reconfiguration capability of OFDM transponder to work at different modulation formats and consequently different spectrum assignments for the working and protection path in network-side protection. The dimensioning of network with both dedicated and shared path protection considering this new scheme is performed and examined in compared with conventional approach to demonstrate the spectrum and power consumption efficiency.
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Hai Dao Thanh. Contribution to Flexible Optical Network Design: Spectrum Assignment and Protection. Networking and Internet Architecture [cs.NI]. Télécom Bretagne; Université de Bretagne Occidentale, 2014. English. ⟨tel-01206788⟩



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