In this paper we have proposed a next generation hybrid WDM/TDM based PON architecture. We have analyzed the role of WDM in access networks, the challenges and strategies to enable smooth and economical migration from current TDM-PONs to future WDM-PONs. The proposed architecture is based on collector ring and distributed star networks that can support both existing TDMPONs and new WDM-PONs. Th...

Multi-domain wavelength-division multiplexing (M-WDM) is proposed as a generalization of single star-coupled WDM networks. The objective is to provide scalable interconnection schemes for different parallel computer architectures that utilize the multi-channel and tunability characteristics of photonic network devices, given their existing limitations. Device tunability results in reconfigurabl...

This paper describes mobile backhaul optical access network designs for future cellular systems, in particular, for those systems that exploit coordinated multipoints (CoMP) transmission/reception techniques. Wavelength-division-multiplexing passive optical networks (WDM-PON) are primarily considered and two proposals to enhance mobile backhaul capability of WDM-PONs for CoMP are presented. One...

This paper discusses the issue of providing basic QoS in optical burst-switched WDM networks. As in WDM networks, end-to-end connection demands are dynamic routes, it changes the state according to the current network traffic status. In order to improve the basic QoS, load balancing technique for lightpath establishment in Optical WDM Networks has been proposed. This approach contains three pha...

This paper presents a method for constructing logical topology in multi-hop WDM networks hierarchically. Our logical topology can be built over WDM ring networks with only three ADMs (Add-Drop Multiplexers) and transceivers per node. We aim to realize low-cost WDMs that can be deployed for MANs and LANs. Due to well constructed hierarchical topology, both the maximum distance between two nodes ...

Optical WDM networks are attracting more and more attentions because of its huge bandwidth to meet the ever increasing demand of modern networking applications. In this paper we study supporting multicast in WDM switching networks. Multicast is the operation to send information from one source to multiple destinations. In WDM switching networks, contention occurs when one output fiber is the de...

Project funded by the European Community under the " Information Society Technologies " Programme (1998-2002) Scheduling in modern networks: state-of-the-art survey * Abstract We discuss several problems in the area of scheduling in WDM networks. We start with a short overview of WDM technologies. Then, we shortly describe scheduling on a single optical fiber, in a WDM LAN, and in a WDM WAN. In...

As a generalization of the traditional path protection (PP) scheme in WDM networks where a backup path is needed for each active path, the partial path protection (PPP) scheme uses a collection of backup paths to protect an active path, where each backup path in the collection protects one or more links on the active path such that every link on the active path is protected by one of the backup...

We introduce three novel algorithms for routing in WDM networks. These schemes are based on the “Best-First Branch-and-Bound” algorithm and take constraints into account. An exact algorithm for the unprotected routing problem in WDM networks, one exact algorithm, and a heuristic for the routing with 1+1 protection are described. By simulations with realistic optical networks and grid topologies...