Abstract
This paper investigates the use of tone reservation for optical orthogonal
frequency-division multiplexing (OFDM) transmission in a short-range, intensity-modulated,
direct-detected (IM/DD) optical channel. Due to the unipolarity of the IM/DD
channel, any asymmetric clipping of the bipolar OFDM signal and associated
nonlinear distortion will result in an unfavorable dc power and significant
performance penalty. Using a detailed analysis of the clipping distortion,
we propose a new framework to enable IM/DD optical OFDM transmission, where
certain subchannels are reserved to produce a negative peak cancellation (NPC)
signal via a frequency-domain digital filter. This NPC signal guarantees a
unipolar OFDM signal, hence eliminating any additional biasing and/or clipping.
It also produces no in-band or out-of-and distortions and requires no transmission
of any side information. Beneficial tradeoffs are identified that enable an
efficient use of both the available power and spectrum.
© 2011 IEEE
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