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Asymmetrically clipped DC biased optical OFDM (ADO-OFDM) is theoretically more optically power efficient than DC-biased OFDM (DCO-OFDM) and spectral efficiency of asymmetrically clipped optical OFDM (ACO-OFDM). In this paper, we investigate the effect of power ratio between the ACO-OFDM and DCO-OFDM to optimize the performance of ADO-OFDM. Then we propose iterative channel equalization with nonlinear compensation to further improve the system performance. Finally, we experimentally demonstrate ADO-OFDM transmission over 20-km single mode fiber at 1.5 dB and 2 dB performance improvement for 4-QAM and 16-QAM formats.
© 2018 The Author(s)
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