Analysis of optical CDMA systems / Análise de sistemas CDMA ópticos

AUTOR(ES)
DATA DE PUBLICAÇÃO

2006

RESUMO

The evolution of optical networks verified in the last few years has been characterized by the search for better bandwidth utilization efficiency. The successful implementation of practical code division for multiple access techniques (CDMA) in mobile communications systems has stimulated new investigations on this topic, particularly in the optical domain (optical CDMA). This is justified due to some remarkable attributes of this technology, such flexibility in code design, capacity on demand, safety, and high scalability. In this context, this dissertation presents, initially, a comprehensive review of several code configurations for OCDMA proposed in the literature, with emphasis particularly on the correlation and users availability properties. Next, it describes the modeling of an optical system consisting of the following three subsystems: generation, transmission, and signal detection. The penalties imposed to the optical codes by the propagating medium, as well as by the devices employed in the system, are accounted for and their influence on the performance of some coding configurations is investigated. The knowledge of how and when these penalties will affect the system is crucial in optical signal processing based on codification schemes. Finally, this work also addresses some aspects related to quality of service (QoS) and flexibility of the OCDMA technology in optical communications systems.

ASSUNTO(S)

optical communication systems códigos ópticos degradações em fibra óptica e dispositivos sistema de comunicações ópticas impairments in fiber optic and devices code division for multiple access in optical domain (ocdma) code in optical domain dispositivos ópticos acesso múltiplo por divisão de código em domínio óptico (ocdma) optical devices

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