Abstract
We analyze limited-wavelength translation in regular
all-optical,wavelength division multiplexed (WDM) networks, where up to W
wavelengths, each of which can carry one circuit, are multiplexed onto a
network link. All-optical wavelength translators with a limited translation
range permit an incoming wavelength to be switched only to a small subset of
the outgoing wavelengths. We focus on the wraparound mesh and hypercube WDM
networks, and analyze the case where an incoming wavelength can be switched to
one of k (k=2, 3) outgoing wavelengths (called the feasible wavelength set).
Our analysis captures the state of a feasible wavelength set at a network
node, which allows us to obtain the probability that a session arriving at a
node at a random time successfully establishes a connection from its source
node to its destination node in each of these topologies. Based on this
probability, we quantify the throughput and blocking performance of limited
wavelength translation, and compare it to that of no wavelength translation
and full wavelength translation. We demonstrate that in regular networks it
can obtain most of the performance advantages of full translation at a
fraction of the cost, and we present a simple, economical switch architecture
to effect limited wavelength translation at a cost that is effectively
independent of the number of wavelengths W in the system.
© 2000 IEEE
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