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Efficient Routing and Resource Allocation in Optical Burst Switched Networks based on WDM/OCDMA and Elastic Bandwidth Optical OFDMA

Beyranvand, Hamzeh | 2013

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 46207 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Salehi, Jawad
  7. Abstract:
  8. Fiber optic networks are the most attractive technology to deal with the ever increasing demands for high rate transmission with guaranteed quality of service and affordable costs. Optical-to-electrical (O/E) and electrical-to-optical (E/O) conversion at intermediate routers are the restricting processes in current optical networks. There is a great interest to remove O/E and E/O conversion at intermediate routers to achieve an all-optical transmission between source and destination. Optical circuit switched (OCS) networks are the first generation of all-optical networks, which are restricted due to its limitation such as being connection oriented, low bandwidth utilization, and coarse bandwidth granularity. Optical packet switched (OPS) networks are the ultimate solution to realize efficient all-optical transmission. However, realization of OPS networks is limited due to the lack of advanced and mature all-optical signal processors. Optical burst switched (OBS) networks has been considered as a compromise between OCS and OPS networks, which have flexibility and elasticity of the OPS networks and can be implemented by using commercialized optical devices. As OBS networks are based on the one-way reservation signaling, contention resolution and reducing blocking probability (BP) are critical issues to improve the performance of OBS networks. There are a few techniques for contention resolution and BP improvement in literature. Among the existing methods, in this thesis we focus on OBS networks utilizing WDM/OCDMA physical layer. We propose an efficient resource allocation algorithm to improve the outage probability and BP of OBS networks. Furthermore, we utilize multilevel transmission technique to increase the number of simultaneously transmitting users, which lead to a lower BP. In addition to OBS networks based on WDM/OCDMA, we also introduce OBS networks utilizing OFDMA physical layer. We design the network architecture, routing and resource allocation algorithm for the introduced scheme. Furthermore, we present an analytical framework to evaluate different operation scenarios in these networks
  9. Keywords:
  10. Optical Code Division Multiple Access (OCDMA) ; Orthogonal Frequency Division Multiplexing (OFDM) ; Service Quality ; Routing ; Optical Burst Switching (OBS) ; Elastic Optical Networks (EON) ; Spectrum Assignment ; Transmission Quality

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