Abstract
Several structures of sharing wavelength converters (WCs) have been proposed for
wavelength interchanging cross connects, including share-per-node (SPN), share-per-link
(SPL), and share-per-wavelength (SPW). Among them, SPN has the highest sharing
efficiency but at the expense of a complex switch fabric. In this paper, we investigate
the Clos-type SPN and SPL structures and propose a novel structure, which is termed as
C-SPW, to share fixed WCs based on the Clos network. The comparative simulations show
that the sharing of fixed WCs in C-SPW can achieve similar drop probability (DP) with
the sharing of tunable ones in Clos-type SPN under synchronous uniform traffic. The
reason is that the fixed WCs in C-SPW can be accessible by all incoming packets, instead
of a subset of them. Furthermore, an analytical model is derived to calculate the DP and
converter utilization rate when C-SPW is operated in a synchronous mode under uniform
traffic. The proposed analytical model fits well with the simulation results.
© 2009 IEEE
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