Abstract
In this paper, we introduce an integrated analysis of quality-of-service
(QoS) performance and technology for optical burst switching (OBS) nodes.
Such an integrated approach is needed to comprehensively assess OBS nodes
as both burst losses and signal degradation limit their maximum achievable
throughput. We apply this analysis to the tune-and-select (TAS) node architecture
as well as to extensions with fiber delay line (FDL) buffers and with limited
tuning range converters. First, we discuss OBS and motivate the need for the
proposed integrated analysis. We survey contention resolution schemes for
OBS and discuss principal QoS performance results for wavelength conversion
and FDL buffering. Also, we describe the basic and extended TAS architectures
as well as their key physical limitations regarding maximum number of wavelengths
and maximum throughput. For the different node architectures, we then present
the results obtained in the integrated analysis. We compare them based on
the maximum utilization as well as the maximum effective throughput under
dynamic traffic. Finally, we compare the architectures with respect to their
normalized cost per terabit per second (Tb/s) and study its sensitivity with
respect to the cost ratio of their key components.
© 2008 IEEE
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