Düser, Michael; (2003) Investigation of Advanced Optical Packet-Routed Network Architectures. Doctoral thesis (Ph.D), UCL (University College London).

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Abstract

This thesis investigates the scalability of future dynamic optical network architectures with respect to their adaptability to rapid changes in traffic patterns and the expected growth in traffic volume, whilst minimizing the required network resources. Static wavelength-routed optical networks (WRON), optical packet switched (OPS) and optical burst switched (OBS) networks are discussed as potential candidates for dynamic future architectures. Due to the limitations of both electronic and optical technologies for switching, processing and buffering, however, neither of the three fully satisfies the requirements for future network architectures. A novel dynamic network architecture, the wavelength-routed optical burst-switched (WR-OBS) network, has been, therefore, proposed, and is analysed in depth in the course of the thesis. The WR-OBS architecture allows access to optical bandwidth in fractions of the of the optical line rate, hence improving resource utilization. In the WR-OBS architecture, all processing and buffering are concentrated at the edge of the network, and bursts are routed over an optical transport core using dynamic wavelength assignment. The queueing of packets in OPS networks and burst aggregation processes in OBS networks are investigated as a function of input traffic statistics, key for the efficient operation of networks which must meet the stringent demands for low packet loss and low latencies of network applications. An analytical network performance model is devised for the WR-OBS network architecture, and novel parameters are introduced to quantify the benefits of dynamic over static wavelength allocation. Efficient scheduling of wavelength requests in the control plane of dynamic networks is essential to meet hard deadlines of time-critical applications. The modified rate monotonic (RM) and earliest deadline first (EDF) algorithms are successfully applied for the scheduling of dynamic network resources. The experimental investigation of fast switching, operation under 10 Gb/s modulation, and fast wavelength stabilisation show the merits, but also the physical limitations of fast tuneable lasers, ultimately limiting the minimum packet size in OPS networks. The results of this work can be applied to optimize the design rules of future optical packet networks, and quantify the operation regimes which best make use of the static or dynamic network architectures.

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