ECSE Departmental Research Seminar, 1-2PM on Friday, 12th May, 2006
Title:Electronic Suppression of the Four-Wave Mixing Induced Distortion in WDM Optical Communication Systems
Speaker: Prof Stephen McLaughlin, University of Edinburgh
Location: Theatre E7, Building 72, Clayton Campus, Monash University
Abstract:
Nonlinear fibre effects are likely to become the main sources of performance degradation in contemporary and future fibre optical communications. This degradation becomes increasingly important in systems using wavelength division multiplexing (WDM), when transmit power is increased or when channel spacing is decreased. The most important nonlinear effects are four wave mixing (FWM) and cross-phase modulation (XPM). Techniques to reduce the impact of nonlinearities include hybrid amplitude/frequency shift keying (ASK/FSK), pulse prechirping, periodic dispersion management and polarization division multiplexing.
This talk begins with a discussion of the effectiveness of post-detection electronic equalization in optical communication systems, where the FWM is the dominant source of distortion is attempted. Some simple linear and nonlinear multichannel equalization structures are examined.
Approaches to performance evaluation of optical communication systems include analytical, semi-analytical and probability of error (PE) estimation techniques. Analytical techniques are often intractable so in practice, semi-analytical, training based techniques applied to the electrical domain are usually resorted to, i.e., after the optical to electrical conversion. A widely used technique of this kind is Gaussian approximation (GA) method. However, its performance is not guaranteed, because in optical systems as a result of the nonlinear effect of the photo-detector the power dependent noise in the receiver is not Gaussian. Therefore, the development of system-independent PE estimation techniques which avoids the Gaussian noise assumption is of high interest. In this talk, a performance evaluation technique based on the extreme value theory (EVT) is applied in the context of optical communications.
About the speaker:
Professor Stephen (Steve) McLaughlin received his B.Sc from the University of Glasgow in 1981 and his PhD from the University of Edinburgh in 1990. Between 1981 and 1987 he held a number of industrial positions. Since 1987 he has been with the University of Edinburgh where he is currently a professor in the School of Engineering and Electronic. He is author or co-author of over 200 papers in a wide range of fields including many aspects of communications: wireless, wired and optical. His research interests can be broadly described as the study of signals and their interaction with systems. He has held many editorial positions. He is a Fellow of the Royal Society of Edinburgh.
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A map of the Clayton Campus of Monash University indicates the venue, Building 72, and visitor parking on the top floor of the North carpark, Building 76.
Limited reserved parking spaces are available for visitors attending the seminar. (Requests for parking should be made in advance)
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