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ROUTING IN AN AWG BASED OPTICAL PACKET SWITCH Submission for Photonic Network Communication

focus is now moving from circuit switched networks, which occupy a wavelength continuously regardless of the demand at that time, towards optical packet/burst switching. By only occupying a wavelength when data is to be transmitted, a more efficient utilis

ROUTING IN AN AWG BASED OPTICAL PACKET SWITCH

Jan Cheyns, Chris Develder, Erik Van Breusegem, Ann Ackaert, Mario Pickavet, Piet Demeester

IBCN group, Department of Information Technology

Ghent University, St.-Pietersnieuwstraat 41, 9000 Ghent, Belgium

Tel. +32 9 267 35 92, Fax. +32 9 267 35 99

{jcheyns, cdvelder, evbreuse, aackaert, pickavet, demeester}@intec.rug.ac.be

Index Terms:

Optical Router, Arrayed Waveguide Grating, Internal blocking

Abstract

For the next generation of the optical internet, focus is now moving from circuit switched networks, whichoccupy a wavelength continuously regardless of the demand at that time, towards optical packet/burst switching. Byonly occupying a wavelength when data is to be transmitted, a more efficient utilisation of bandwidth in opticalfibres is strived for. As bandwidth in fibres keeps increasing, the bottleneck of the optical network is now movingtowards the switching node, since evolution of electronic routers cannot follow the speed of bandwidth increase.Thus a key component in these novel networks is the optical node. Through this node we want to switch traffic veryfast and reliable, preferably transparent. Lack of efficient and practically realisable optical memory however makesmigration from electronic routers to optical routers a non-straightforward transition. In most optical nodes payloadtraffic can be switched transparently, whilst control information (e.g. in a header, on a control channel) is stillconverted to the electronic domain in every node, since optical processing is far from mature. In this paper wepresent a possible architecture for such a node, combining Array Waveguide Gratings and all-optical tuneablewavelength converters. The concept of this switch is explained and the node is evaluated in terms of loss rate. Wewill see that an inherent problem of this switch is its internal blocking. This drawback can be greatly overcome byusing an intelligent and efficient wavelength assignment algorithm within the node. Simulation of slotted operationwill give some numerical results.

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