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Performance Analysis of DHT-Based Optical OFDM Using Large-Size Constellations in AWGN

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1 Author(s)
Michela Svaluto Moreolo ; Centre Tecnol`ogic de Telecomunicacions de Catalunya, 08860 Castelldefels (Barcelona), Spain

We demonstrate that optical OFDM (O-OFDM) based on discrete Hartley transform (DHT) can be used with large-size constellations, furnishing alternative simplified schemes suitable for intensity-modulated direct-detection (IM/DD) systems. Both DC-biased and power-efficient asymmetrically clipped (AC) solutions are analyzed for real constellations from BPSK (binary-phase-shift keying) to 32 PAM (pulse-amplitude modulation). The performance is compared to standard O-OFDM based on fast Fourier transform (FFT) using constellations from 4 QAM (quadrature-amplitude modulation) to 1024 QAM, showing perfect agreement. The analysis of clipping effect evidences the suitability of the proposed AC scheme for adaptive systems.

Published in:

IEEE Communications Letters  (Volume:15 ,  Issue: 5 )