Abstract
We review the recent progress of information theory in optical
communications, and describe the current experimental results and associated
advances in various individual technologies which increase the information
capacity. We confirm the widely held belief that the reported capacities are
approaching the fundamental limits imposed by signal-to-noise ratio and the
distributed non-linearity of conventional optical fibres, resulting in the
reduction in the growth rate of communication capacity. We also discuss the
techniques which are promising to increase and/or approach the information
capacity limit.
© 2010 IEEE
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