Due to the tremendous growth of traffic volume caused by both exponential increase of number of Internet users and continual emergence of new bandwidth demanding applications, high capacity networks are required in order to satisfactorily handle the extremely large amount of traffic. Hence, optical fiber communication is the key technology for the network infrastructure. This thesis addresses design, analysis and simulation of access and core networks targeting important research problems, which need to be tackled for the effective realization of next generation optical networks. Among different fiber access architectures, passive optical network (PON) is considered as the most promising alternative for the last mile connection due to its relatively low cost and resource efficiency. The inherent bursty nature of the user generated traffic results in dynamically changing bandwidth demand on per subscriber basis. In addition, access networks are required to support differentiated quality of service and accommodate multiple service providers. To address these problems we proposed three novel scheduling algorithms to efficiently realize dynamic bandwidth allocation in PON, along with guaranteeing both the priority and fairness of the differentiated services among multiple users and/or service providers. Meanwhile, because of the increasing significance of reliable access to network services, an efficient fault management mechanism needs to be provided in PON. In addition, access networks are very cost sensitive and the cost of protection should be kept as low as possible. Therefore, we proposed three novel cost-effective protection architectures keeping in mind that reliability requirement in access networks should be satisfied at the minimal cost. Regarding the optical core networks, replacing electronic routers with all-optical switching nodes can offer significant advantages in realizing high capacity networks. Because of the technological limitations for realizing all-optical nodes, the focus is put on the ingenious architecture design. Therefore, we contributed on novel switching node architectures for optical circuit and packet switching networks. Furthermore, we addressed different aspects of routing and wavelength assignment (RWA) problem, which is an important and hard task to be solved in wavelength routed networks. First, we proposed an approach based on the information summary protocol to reduce the large amount of control overhead needed for dissemination of the link state information in the case of adaptive routing. In addition, transparency in optical networks may cause vulnerability to physical layer attacks. To target this critical security related issue, we proposed an RWA solution to minimize the possible reachability of a jamming attack. Finally, in order to evaluate our ideas we developed two tailor-made simulators based on discrete event driven system for the detailed studies of PON and switched optical networks. Moreover, the proposed tabu search heuristic for our RWA solution was implemented in C++. / QC 20100707

Orientador: Edson Moschim / Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Eletrica e de Computação / Made available in DSpace on 2018-08-06T19:40:07Z (GMT). No. of bitstreams: 1 Dante_ReinaldoGolmia_D.pdf: 5560458 bytes, checksum: a0ff22b15404f7232c1e6c38c9668fdc (MD5) Previous issue date: 2006 / Resumo: Neste trabalho, apresentam-se algumas contribuições para o estudo de redes ópticas inteligentes e transparentes, por exemplo: Redes Ópticas Comutáveis Automaticamente (ASON), no que tange aos protocolos de roteamento e atribuição de comprimentos de onda para o estabelecimento de conexões fim-a-fim em ambientes distribuídos. Os resultados deste trabalho foram obtidos através da simulação dos algoritmos de roteamento e atribuição de comprimentos de onda desenvolvidos em C++. Para que o estudo pudesse ser feito, foram adotadas algumas topologias de rede comerciais e hipotéticas para a comparação de desempenho entre os algoritmos de roteamento e atribuição de comprimentos de onda propostos e os clássicos de modo a identificar as diferenças de comportamento destes algoritmos nas redes ópticas em diversas situações, incluindo as condições de restrição de alcance dos canais ópticos e a continuidade do comprimento de onda no estabelecimento de uma conexão fim-a-fim. Os resultados mostraram que os algoritmos de roteamento e de atribuição de comprimentos de onda propostos são eficientes para o funcionamento destas redes, provendo desempenhos iguais ou superiores em relação aos demais algoritmos de roteamento e atribuição de comprimentos de onda tradicionais medidos em termos da probabilidade de bloqueio dos pedidos de conexão. Como conseqüência, estes algoritmos propostos demonstraram que são capazes de aperfeiçoar o QoS óptico nas redes ópticas inteligentes e transparentes / Abstract: In this work, we present contributions to the routing and wavelength assignment protocols in transparent and intelligent optical networks such as Automatically Switched Optical Networks (ASON) for end-to-end connection establishment on the distributed environments. The results of this work were obtained through simulation of the routing and wavelengh assignment algorithms which were developed in C++. For this study, some commercially and hypothetical network topologies were adopted to compare the performance of the proposed routing and wavelengh assignment algorithms with traditional ones in order to identify the differences of those algorithm performance. Studies were carried out in optical networks under several conditions such as the limit of optical transmission reach and wavelength-continuity constraints for end-to-end connection establishment. The results have shown that the proposed routing and wavelengh assignment algorithms are efficient for use in these networks, providing equal or higher performance than traditional routing and wavelengh assignment algorithms measured in terms of blocking probability of the connection requests. Consequently, the proposed algorithms showed that they are able to improve the optical QoS in transparent and intelligent optical networks / Doutorado / Telecomunicações e Telemática / Doutor em Engenharia Elétrica