Abstract
This paper describes an optical switch architecture based on the
shared-per-wavelength strategy for contention resolution in the wavelength domain. This
strategy impacts on wavelength converters requirements and switch organization, by
allowing to obtain cost saving. The general sharing concept is first introduced and the
related practical solution as a multistage switch architecture is presented and
thoroughly analyzed in terms of performance, control and cost perspectives. Heuristic
scheduling to manage packet forwarding in a synchronous context is developed and
discussed in terms of computational complexity. A simple accurate analytical model is
developed and validated against simulation to numerically evaluate packet loss
performance of the shared-per-wavelength switch. The main achievement of the work is
represented by the proposal of a feasible approach which leads to remarkable cost saving
in terms of optical gates and wavelength converters under the conditions outlined.
© 2009 IEEE
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