Abstract
This paper investigates the performance of some recently proposed optical
orthogonal frequency-division multiplexing (OFDM) transmission techniques in
a short-range intensity-modulated, direct-detected (IM/DD) optical channel.
Due to the unipolarity of the IM/DD channel, asymmetric clipping and
associated nonlinear distortion is inevitable, resulting in an unfavorable
dc power and a significant performance penalty. Using a detailed analysis of
the clipped signal, our recent work focused on reducing this
clipping-resulted dc via both power optimization and frequency planning. In
this paper, a set of effective receiver signal-to-noise ratio formulas is
proposed, which helps in accurately and efficiently evaluating the system
performance across various optical OFDM systems. We conduct a power
efficiency analysis to reveal tradeoffs between power and spectral
efficiencies among different systems. Our results show that with a cost of
additional complexity, a diversity-combining technique offers significant
benefits in all cases.
© 2012 IEEE
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