Performance analysis of contention resolution, Routing and Wavelength Assignment in optical burst switching network
This research work focuses on contention and Routing and Wavelength Assignment (RWA) problems for wavelength division multiplexing (WDM) network. Contention problem is one of the major problems of high speed optical WDM network. Contention occurs when two or more packets or bursts try to leave the s...
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| Format: | Thesis |
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2010
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| Summary: | This research work focuses on contention and Routing and Wavelength Assignment (RWA) problems for wavelength division multiplexing (WDM) network. Contention problem is one of the major problems of high speed optical WDM network. Contention occurs when two or more packets or bursts try to leave the switch at the same time from the same output link using the same wavelength. Several contention resolution algorithms exist at present. These are deflection routing, wavelength conversion, fiber delay line etc. In this thesis, various contention resolution algorithms are examined. Some combinational algorithms like delay-deflection and deflection-delay are also analyzed. In the analysis, it is found that, combinational algorithms outperform the individual algorithms. Routing and Wavelength Assignment (RWA) algorithms have significant impact on the performances of optical network. For this reason, RWA are analyzed without considering the physical impairments. Additionally, a new alternative routing algorithm that performs better than the traditional algorithm is proposed and characterized. Comparing with the traditional algorithms, it is found that, the proposed algorithm performs better than the others. Finally, several physical impairments, especially Four-Wave-Mixing (FWM) which can limit the capacity of WDM network are analyzed. From the performance evaluation results, it is shown that shortest-path-first performs better than the longestpath-first algorithm in the first-fit wavelength selection in the presence of FWM. |
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