Abstract
Feature Issue on
Next-Generation WDM Network Design and Routing (WDMN). Optical
fiber delay line (FDL) is currently the only technology available for implementing
optical buffering. Feed-forward and feedback are two types of FDL structures in
optical buffering, both of which have advantages and disadvantages. We present what
we believe to be a novel architecture for WDM optical packet switches with an
effective hybrid FDL buffering configuration that combines the merits of both
feed-forward and feedback schemes. The core of the switch architecture is a number
of arrayed waveguide gratings (AWG) and tunable wavelength converters (TWC). It
requires smaller optical device sizes and fewer wavelengths and experiences less
noise than feedback architecture. At the same time, it supports preemptive priority
routing such as feedback architecture. Empirical results show that the proposed new
switch architecture significantly reduces packet-loss probability.
© 2003 Optical Society of America
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