Current optical transport networks are based on non-transparent SONET/SDH technology. Wavelength multiplexed systems (WDM) modulate optical signals with SONET/SDH digital formats at 2.5 and 10Gb/s rates. Transparent Optical Networks have been actively researched as a way to make optical transport independent from the electronic signals transmitted. In this article, we review recent developments in optical components that facilitate a flexible spectrum usage of DWDM systems. In addition, we discuss emerging optical transport
services and how they can be best served by a state-of-the-art transport network.
In this document, we study the complexity of routing and wavelength assignment problem in WDM rings with limited wavelength conversion capability. We address a specific wavelength conversion capability, represented by a cluster model. In the cluster model, we first define a set of disjoint clusters of wavelengths among the available wavelength set. We allow wavelength conversion only between wavelengths belonging to the same cluster. Because the cluster model is able to describe a large number of conversion limited WDM systems, we expect that our results be valuable for the design and performance study of RWA algorithms for a large number of WDM ring systems.
In this paper, we discuss issues of rate controlling many- to-many multicast connections. In particular, we present an end to end rate control algorithm for multicast ABR service in ATM networks. The algorithm is the extension of the SP- MRCA point-to-multicast congestion control algorithm proposed. The goal is to control the various multicast members input rates in order to achieve high bandwidth utilization without overflowing any queue along a multicast tree. We show that a multipoint-to-multipoint multicast connection can be viewed as a superposition of one-to-many multicast connections, and compute the multicast input rate for each multicast member separately. The algorithm proposed, called SP-MMRCA, inherits many of the properties of the point-to-multipoint SP-MRCA.
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