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Performance analysis and centralised optical processing in next generation access networks

Cao, B.; (2012) Performance analysis and centralised optical processing in next generation access networks. Doctoral thesis, UCL (University College London). Green open access

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Abstract

The Next Generation Passive Optical Network (NG-PON) is currently being standardised and developed, with a goal to achieve higher bandwidth at 10Gb/s, greater capacity at thousands of users and longer backhaul reach at 60km or 100km. The aim is to provide cost effective solutions for telecom operators to vastly deploy optical access networks, enabling customers with the benefit of the greater bandwidth and wider range of services. This thesis presents research that has identified and addressed various design issues relating to next generation access networks. Interferometric noise may be present in future, ring based, access networks which utilise WDM and OADMs. Simulation and experiment results are presented which studies the performance tolerance to not-precisely-defined wavelength, in the presence of interferometric noise. The impact of receiver electrical filtering was also investigated. The next generation access network will, in the upstream direction, use burst transmission and are likely to need a large tolerance to wavelength drift due to the low cost equipment used at the customer’s premises. A demonstration of optical burst equalisation was presented, based on SOAs. This study also explores the possibility of reducing the SOA saturation induced non-linear distortions through simulations and experiments. As an extension to the optical burst equaliser and to remedy the saturation induced distortions, an intermediate site optical processing system was proposed. This solution not only performs burst-mode wavelength conversion at 10 Gb/s, but also pre-chirps the signal to allow long-reach transmission and suppressed level fluctuation to ease the requirements on the burst-mode receiver. As a result, a proof of concept 10Gb/s Wavelength Converting Optical Access Network (WCOAN) with up to 62km DWDM backhaul is experimentally demonstrate. It is designed to consolidate drifting wavelengths, generated with an uncooled laser in the upstream direction, into a stable wavelength channel for DWDM long backhaul transmission.

Type:Thesis (Doctoral)
Title:Performance analysis and centralised optical processing in next generation access networks
Open access status:An open access version is available from UCL Discovery
Language:English
UCL classification:UCL > School of BEAMS > Faculty of Engineering Science > Electronic and Electrical Engineering

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