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Details of Grant 

EPSRC Reference: EP/C523865/1
Title: Fibre nonlinearity and dispersion compensation using high-speed digital signal processing
Principal Investigator: Killey, Dr RI
Other Investigators:
Bayvel, Professor P
Researcher Co-Investigators:
Project Partners:
Intel Corporation Ltd
Department: Electronic and Electrical Engineering
Organisation: UCL
Scheme: Standard Research (Pre-FEC)
Starts: 01 July 2005 Ends: 31 December 2008 Value (£): 202,576
EPSRC Research Topic Classifications:
Electronic Devices & Subsys. Energy Efficiency
Optical Communications
EPSRC Industrial Sector Classifications:
Communications Electronics
Related Grants:
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Summary on Grant Application Form
Adaptive compensation of transmission impairments will be key in achieving increased capacity and distances, and realising all-optical wavelength routing and switching in future photonic networks. Signal distortion results from physical effects including the fibre nonlinearity, group velocity dispersion, and optical spectral narrowing due to cascaded wavelength routers. To overcome these limitations, research is required on new compensation devices which are adaptive, compact, low cost and have low power consumption.One of the most promising techniques which meets these requirements is the use of electronic compensation. Methods proposed include both analogue (feedforward equalization and decision feedback equalisation filters), and digital (maximum likelihood sequence estimation) techniques, but the optimum implementation remains an open question. The work in this project will answer fundamental questions concerning the realization of electronic compensation. It will assess the feasibility of 10 and 40 Gb/s digital compensators based on predicted future improvements in the speed and power consumption of BiCMOS technology and will lead to design rules to enable the optical and electronic components in the transmitter and receiver to function together to maximise gains in transmission performance.A novel digital filter architecture and its application in driving a dual electrode Mach-Zehnder modulator to generate precompensated signals are proposed here for the first time. The work will include a comprehensive study of this technique, through simulations and recirculating fibre loop experiments. Practical limitations due to quantization noise, limited sample rates and non-ideal modulator characteristics will be investigated. Recirculating fibre loop transmission experiments, using an arbitrary waveform generator emulating the operation of the digital filters, and simulations will be carried out to assess the benefits and limitations of this technique. The problem of controlling adaptive compensators in all-optical wavelength routed-networks will be addressed. The performance of a range of control algorithms, including least-mean-squares and steepest descent algorithms, will be quantified in terms of their stability and speed, and their suitability for fast switching, for example in protection switching or packet and burst switched networks. The work will lead to significant advances in the understanding of electronic compensation of impairments in optical communications, an experimental demonstration of increases in error-free transmission distances of over four times the dispersion limit, and the first demonstration of effective electronic compensation of intra-channel fibre nonlinearity.
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