Abstract
In this paper, we show the physical limitations of semiconductor optical
amplifier (SOA)-based switching nodes for optical burst switching (OBS). The
investigation covers one basic tune-and-select (TAS) architecture, as well
as extensions with wavelength converters of limited tuning range (LTR) and
dedicated and shared fiber delay line (FDL) buffers. Their maximum size and
throughput are analyzed for nodes with four input/output fibers at different
bit rates. As main impairments for signal degradation amplifier noise and
crosstalk are considered. It is shown that the advanced contention resolution
functionality leads to smaller-sized nodes due to higher losses and noise.
Among the considered node architectures the highest maximum throughput can
be achieved with TAS-LTR due to the smaller number of SOA noise contributions.
© 2008 IEEE
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