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Performance of Asymmetrically Clipped Optical OFDM in AWGN for an Intensity Modulated Direct
 

Summary: Performance of Asymmetrically Clipped Optical
OFDM in AWGN for an Intensity Modulated Direct
Detection System
Jean Armstrong, Brendon J.C. Schmidt, Dhruv Kalra, Himal A. Suraweera and Arthur J. Lowery
Department of Electrical and Computer Systems Engineering, Monash University
Melbourne, Victoria, 3800, Australia
Email: jean.armstrong@eng.monash.edu.au
Abstract- Orthogonal frequency division multiplexing
(OFDM) is used in many wired and wireless broadband
communication systems because of its resilience in the presence of
signal dispersion or multipath distortion. OFDM has not been
used in practical optical communication systems because the
bipolar waveform cannot be used in intensity-modulated direct
detection (IM/DD) systems. A new unipolar form of OFDM,
asymmetrically clipped optical OFDM (ACO-OFDM), has
recently been developed. For the case of an AWGN channel, we
compare ACO-OFDM and other modulation schemes. It is shown
that ACO-OFDM with 4-QAM subcarrier modulation has the
same bandwidth efficiency but requires 2 dB less energy per bit
than on-off keying. ACO-OFDM with larger constellation sizes

  

Source: Armstrong, Jean - Department of Electrical and Computer Systems Engineering, Monash University

 

Collections: Engineering