峰均功率比(PAPR)问题是OFDM系统的主要缺陷之一,在光OFDM系统中,由于调制器、D/A转换器、功率放大器和光纤的非线性,高峰均功率比的信号将会产生严重畸变,对系统的性能造成较大的影响。介绍了降低OFDM系统PAPR的主要方法,包括信号预畸变技术、编码技术和概率类技术,并对星座图扩展(ACE)方法和脉冲成形(PS)方法进行了仿真分析,讨论了各自的优缺点及改进的空间。 The peak-to-average power ratio (PAPR) problem is one of the major drawbacks of OFDM systems. In optical OFDM systems, signals with high peak-to-average power ratios due to the nonlinearity of modulators, D / A converters, power amplifiers and optical fibers Serious distortion, the system performance has a greater impact. The main methods to reduce the PAPR of OFDM systems are introduced, including signal predistortion, coding and probabilistic techniques. The constellation expansion (ACE) method and the pulse shaping (PS) method are analyzed and their advantages and disadvantages are discussed And improvement of space.