Abstract
We propose the implementation of spectral-amplitude-coding optical code
division multiple access (SAC-OCDMA) as a contention resolution technique in
optical burst switched (OBS) networks. The new system architecture is
presented in details where an all-optical methodology for cancelling
multiple access interference is proposed. Performance evaluation of the
proposed system in both MAC and optical layers is introduced where the
overall burst error rate of the system is evaluated in three cases: full,
partial, and no code conversion capabilities taking into account the
receiver dark current, thermal, and shot noises at the egress nodes. Our
results reveal that a considerable improvement in the performance of each
core node in the system is achieved by using SAC-OCDMA instead of WDM in the
optical layer underneath an OBS based MAC layer. We also conclude that a
slight increase in the employed number of code converters enhances the
overall system performance noticeably. Finally, optimum values for the
number of codes, which lead to minimum overall burst error rate, are reached
at different traffic conditions.
© 2009 IEEE
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