Abstract
Two architectures are proposed for a wavelength-division multiplexed
optical packet switch equipped with both limited-range wavelength converters
(LRWCs) and shared full-range wavelength converters (FRWCs). The FRWCs are
used to overcome the performance degradation in terms of packet loss probability
due to the use of LRWCs only. Two different sharing strategies of the FRWCs
are considered. In the first architecture, a pool of FRWCs is shared among
the arriving packets. In the second one, the sharing is only partial and the
packets directed to the same output share a same pool of FRWCs. A probabilistic
model is proposed to dimension the number of shared FRWCs so that the same
packet loss probability of a switch equipped with only shared FRWCs is guaranteed.
After introducing a cost model of the converters depending on the conversion
range, we show that the architectures may allow a conversion cost savings
on the order of 90%.
© 2008 IEEE
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