Comparison of Asymmetrically Clipped Optical OFDM and DC-Biased Optical OFDM in AWGN

• Published in: IEEE communications letters Vol. 12; no. 5; pp. 343 - 345
• Main Authors: Armstrong, J., Schmidt, B.J.C.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01-05-2008; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Adaptive optics; Adaptive systems; Applied sciences; Asymmetry; AWGN; Bias; Constellations; Exact sciences and technology; Information, signal and communications theory; Intensity modulation; Intersymbol interference; Modulation, demodulation; Multiplexing; OFDM modulation; Optical fiber communication; Optical modulation; Optical transmitters; Optimization; Orthogonal Frequency Division Multiplexing; Quadrature amplitude modulation; Signal and communications theory; Simulation; Systems, networks and services of telecommunications; Telecommunications; Telecommunications and information theory; Transmission and modulation (techniques and equipments); Performance evaluation; AWGN; Quadrature amplitude modulation; Adaptive system; Information rate; Theoretical study; Information transmission; OFDM. intensity modulated direct detection. asymmetrically clipped optical OFDM; Direct detection; Simulation; Orthogonal frequency division multiplexing; DC-biased optical OFDM; Intensity modulation
• ISSN: 1089-7798; 1558-2558
• DOI: 10.1109/LCOMM.2008.080193

We present theoretical and simulation results for the performance of asymmetrically-clipped optical OFDM (ACO-OFDM) and DC-biased optical OFDM (DCO-OFDM) in AWGN for intensity-modulated direct-detection systems. Constellations from 4 QAM to 1024 QAM are considered. For DCO-OFDM, the optimum bias depends on the constellation size which limits its performance in adaptive systems. ACO-OFDM requires less optical power for a given data rate than DCO-OFDM for all but the largest constellations and is better suited to adaptive systems as the same structure is optimum for all constellations.