Abstract
We discuss a wavelength-division-multiplexed-based passive-optical-network (PON) architecture that allows for
incremental upgrade from single-channel time-division multiple-access PONs in order to provide higher bandwidth in
the access network. Various dynamic-wavelength and bandwidth-allocation algorithms (DWBAs) for wave-division
multiplexed PON are presented; they exploit both interchannel and intrachannel statistical multiplexing in order to
achieve better performance, especially when the load on various channels is not symmetric. Three variants of the
DWBA are presented, and their performance is compared. While the first variant incurs larger idle times (and, hence,
poor performance), the other two algorithms achieve better but different performance with critical dissimilarities.
Our analysis also focuses on the fair assignment of excessive bandwidth in the upstream direction to highly loaded
optical network units. We compare the performance of DWBA to another algorithm that relies on static-channel
allocation. Furthermore, a study is presented wherein the number of wavelengths increases, and a comparison with
interleaved polling with adaptive cycle time is shown. We use extensive simulations throughout this paper.
© 2007 IEEE
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