基于SF-MCMA均衡技术的直接检测光OFDM系统实验研究  

Experimental research on direct-detection optical OFDM system based on SF-MCMA equalization technique

作　　者：杨柳青青 肖江南[1] 孔敏[1] 陈林[1] 

机构地区：[1]湖南大学信息科学与工程学院,微纳光电器件及应用教育部重点实验室,湖南长沙410082

出　　处：《光电子．激光》2013年第5期917-923,共7页Journal of Optoelectronics·Laser

基　　金：国家自然科学基金(60977049);国家高技术研究发展"863"计划(2011AA010203);湖南省自然科学基金(12JJ3070)资助项目

摘　　要：提出了一种基于分频修正常模算法(SF-MCMA)的均衡技术补偿由光正交频分复用(O-OFDM)传输系统中色散引起的频率选择性衰减(FF)对信号的影响。理论分析了直接检测O-OFDM(DDO-OFDM)传输系统中O-OFDM信号因色散而产生的FF原因,并证明了对O-OFDM不同子载波信号进行SF-MCMA均衡可以纠正色散对OFDM信号的幅度失真和相位偏移的影响。通过实验表明,经100km标准单模光纤(SSMF)传输后,使用SF-MCMA均衡的信号比未使用该均衡的信号系统接收功率代价在(BER)为10e-4时降低了2dB。说明此均衡方法能够有效抵抗色散的影响。同时,此方法中O-OFDM信号不需要训练序列和导频,节省了带宽,可提高信号的频谱利用率。An equalization method based on separate frequency modified constant modulus algorithm （SFMCMA） is proposed to reduce the influence of frequency selective fading （FF） caused by chromatic dis- persion in the optical orthogonal frequency division multiplexing （O-OFDM） transmission system. The theoretical analysis shows that the reason for frequency selective fading of the optical orthogonal frequency division multiplexing signal is chromatic dispersion in direct-detection O-OFDM （DIKNOFDM） transmission system without training sequence or pilot, and it is proved that the equalization based on SF-MCMA can correct the amplitude distortion and the phase deviation of the different subcarriers signals. The experimental results show that the power penalty of system using SF-MCMA equalization at 10e-4 BER is 2 dB less than that without equalization when the OFDM signals transmitted over 100 km standard single mode fiber （SSMF）. It is proved that the method is good at dispersion compensation, and the system using SF-MCMA equalizer has good performance to restore signals. No training sequence or pilot sequence is required in the system,and the proposed method can save the signal bandwidth and improve the availability of the signal spectrum.

关 键 词：光正交频分复用(O-OFDM) 频率选择性衰减(FF) 分频技术 修正常模算法(MCMA) 色散补偿 

分 类 号：TN929.9[电子电信—通信与信息系统]