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In this paper, the technique of asymmetrically clipped optical orthogonal frequency-division multiplexing (ACO-OFDM) has been extended to a two dimensional (2D) optical communication system. Simulation results for the performance of 2D spatial ACO-OFDM (SACO-OFDM) in the presence of additive white Gaussian noise (AWGN) are presented. The bit error rate (BER) and optical power efficiency of SACO-OFDM...