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中文摘要：
仿真研究并实验验证了直接检测光正交频分复用（O-OFDM）系统中引入压扩变换（CT）技术可降低OFDM信号峰值平均功率比（PAPR）和提高接收灵敏度。仿真结果表明,压扩系数μ越大,信号PAPR越低;随着μ的增大,系统误码率（BER）呈现先下降后上升的趋势。权衡PAPR的降低度和系统BER,选择μ=2时为最佳。实验研究表明,当μ=2时,OFDM信号PAPR降低约3 dB;经过100 km标准单模光纤（SSMF）的传输后,在BER为10-4时,灵敏度提高约2.5 dBm。
英文摘要：
The direct-detection optical orthogonal frequency division multiplexing（O-OFDM） system with companding transform（CT） technique is investigated by simulation and experiment to reduce the peak-to-average power ratio（PAPR） of OFDM signals and improve the sensitivity of the receiver.The simulation results show that when increasing the companding coefficient μ,the PAPR of the OFDM signal decreases and the bit error rate（BER） of the system firstly decreases and then increases.We can choose a proper μ according to the PAPR and BER of the system.The experimented results confirm that the PAPR of the OFDM signal is decreased by 3 dB,and the receiver sensitivity is improved by 2.5 dB at BER of 10-4 after transmission over a 100-km single-mode fiber when μ is 2.
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