Abstract
Optical packet switching (OPS) has been considered to be a promising
paradigm to support a wide range of applications with different time-varying
and high bandwidth demands for future optical metropolitan area networks
(MANs). In this paper, we present the design of an experimental
optical-header processing and access control system (OPACS) for an OPS
wavelength-division multiplexing metro slotted-ring network. On the slotted
ring, each control header is in-band time-division-multiplexed with its
corresponding payload within a slot. OPACS enables the optical headers
across all parallel wavelengths to be efficiently received, modified, and
retransmitted by means of a wavelength–time conversion technique.
Moreover, OPACS embodies a versatile medium access control (MAC) scheme,
referred to as the distributed multigranularity and multiwindow reservation
(DMGWR) mechanism, which is particularly advantageous for traffic of high
and varying loads and burstiness. Basically, DMGWR requires each node to
make reservation requests prior to transmissions while maintaining a
distributed queue for ensuring fair access of bandwidth. By
“multigranularity,” each node can make a reservation of
multiple slots at a time. By “multiwindow,” each node is
allowed to have multiple outstanding reservations within the window size.
From simulation results that pit the OPACS network against two other
existing networks, we show that the OPACS network outperforms these networks
with respect to throughput, access delay, and fairness under various traffic
patterns. Experimental results demonstrate that all optical headers are
removed and combined with the data in a fully synchronous manner, justifying
the viability of the system.
© 2009 IEEE
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