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光正交频分复用(O-OFDM)是一种有效降低符号间干扰的高速数据调制技术。在技术实现过程中若峰值平均功率比(PAPR)过高,发射机和接收机内部放大器线性要求就会很高,从而限制了O-OFDM调制技术的实际应用。总结了目前国内外降低PAPR的多种技术,在此基础上,给出了PAPR的定义和分布,并提出了一种新的基于虚拟子载波来降低光OFDM系统PAPR的方法,该方法在发送端不需要传输OFDM信号的边带信息,接收端不需增加额外处理。实验和仿真结果证明,经200km标准单模光纤(SSMF)传输后,该方法既能更加有效地抑制O-OFDM的PAPR,又能改善系统的误码率(BER)性能和降低传统虚拟子载波技术计算的复杂度。
Optical Orthogonal Frequency Division Multiplexing (O-OFDM) is a high-speed data modulation technique that effectively reduces intersymbol interference. If the peak-to-average power ratio (PAPR) is too high during the implementation of the technology, the linear requirements of the internal amplifier of the transmitter and the receiver will be very high, which limits the practical application of the O-OFDM modulation technology. Based on this, the definition and distribution of PAPR are given, and a new method to reduce the PAPR of optical OFDM system based on virtual subcarrier is proposed. The side does not need to transmit the sideband information of OFDM signal, the receiving end does not need to increase extra processing. Experimental and simulation results show that the proposed method can suppress the PAPR of O-OFDM more effectively and improve the BER performance and reduce the complexity of traditional virtual subcarriers The complexity of technical calculations.