IM/DD dual stream asymmetrically clipped optical OFDM system

• Main Authors: Baig, Mohammed Salman, Abas, Ahmad Fauzi, Alresheedi, Mohammed Thamer, Mahdi, Mohd Adzir
• Format: Article
• Language: English
• Published: S P I E - International Society for Optical Engineering 2018
• Online Access: http://psasir.upm.edu.my/id/eprint/74548/1/IM.pdf; http://psasir.upm.edu.my/id/eprint/74548/; https://www.spiedigitallibrary.org/journals/Optical-Engineering/volume-57/issue-8/086103/IMDD-dual-stream-asymmetrically-clipped-optical-OFDM-system/10.1117/1.OE.57.8.086103.short

A dual stream asymmetrically clipped optical (DSACO)-orthogonal frequency division multiplexing (OFDM) with intensity modulation/direct detection receiver is proposed that combines the ACO-OFDM, which is generated from individual streams of odd and even frequencies in a single frame without loss of information. The clipping noise, which is its absolute value, is subtracted from even subcarriers of DSACO-OFDM signal and further delayed in time domain to recover the ACO-OFDM data of the odd stream. The proposed DSACO has the same spectral efficiency of DC-biased optical OFDM (DCO-OFDM). It performs better in terms of optical signal-to-noise ratio (OSNR) and peak-to-average power ratio (PAPR) when compared to ASCO-OFDM and Lowery’s layered/enhanced ACO-OFDM (L/E ACO-OFDM). For a bit error rate of 10 − 3, DSACO shows around 1.9, 3.4, and 7.6 dB improvements of OSNR over two-layered L/E ACO-OFDM, three-layered L/E ACO-OFDM, and ASCO-OFDM for 1024-quadrature amplitude modulation constellations, respectively. The complimentary cumulative distributive function of PAPR for DSACO achieves 0.27 dB lower PAPR than three-layered L/E ACO-OFDM system and 1.17 dB lower PAPR than two-layered L/E ACO-OFDM and ASCO-OFDM.