Tandon, Vivek; (1996) Lambdapon: The dynamically reconfigurable wavelength multiplexed passive optical network. Doctoral thesis (Ph.D.), University College London (United Kingdom).

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Abstract

The introduction of new broadband services implies that in the future, both business and residential users will generate increasing amounts of traffic and require access to higher capacity data-channels. It is widely accepted that the introduction of these new services will require transport and processing capacities much larger than those available using today's electronic-based technologies, in both the time and space domains. A broadband wavelength division multiplexed (WDM) based Passive Optical Network which enables the cost of the access network to be shared amongst a large number of customers is proposed. The design allows customers to construct an optical connection between any two (or more) terminals, in which all the traffic routing functions are performed whilst in the optical domain. The optical connection supports several levels of bandwidth, enabling customers to request bandwidth as required. Unfortunately, the number of wavelength channels available for allocation to connection requests are limited by fibre non-linearities and component technology. This thesis proposes a novel method of augmenting the capacity of the network by wavelength reuse. This is achieved using absorbers which offer the selective filtering of a wavelength or group of wavelengths in real time. The absorbers enable wavelengths to be dynamically localised to desired areas of the network and hence reused elsewhere. The allocation of wavelengths to customers, the control and monitoring of the network state, and the dynamic manipulation of the absorbers is achieved by the use of a centralised Network Routing Manager. The proposed network is modelled and results of its throughput performance under various traffic loadings, using different routing algorithms, wavelength allocation algorithms and network topologies are presented. Practical implementation issues and components are also discussed.

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