【作者】 周聪； 王小龙； 邓磊； 程孟凡； 唐明； 张敏明； 付松年； 刘陈； 刘小英； 刘德明；

【Author】 ZHOU Cong;WANG Xiao-long;DENG Lei;CHENG Meng-fan;TANG Ming;ZHANG Min-ming;FU Song-nian;LIU Chen;LIU Xiao-ying;LIU De-ming;Next Generation Internet Access system National Engineering Laboratory, Huazhong University of Science and Technology;

【机构】 下一代互联网接入系统国家工程实验室华中科技大学；

【摘要】 为提升相干光正交频分复用(CO-OFDM)系统的非线性容忍度,降低OFDM信号的峰均比(PAPR)是一种有效措施。载波干涉(CI)和部分传输序列(PTS)是两种典型的PAPR抑制算法,本文重点分析了这两种算法,并基于这两种算法优化设计了一种增强型载波干涉技术(ACI),以改善CO-OFDM系统的非线性容忍度。理论分析和仿真证明,ACI能降低OFDM信号PAPR约3.5d B,PAPR抑制能力优于CI和PTS。本文构建了速率为25Gbps、调制格式为16QAM-OFDM、传输距离为1000km的CO-OFDM传输系统,仿真结果显示,在保证系统误码率性能不劣化的情况下,ACI能将系统的非线性容忍度有效提升1d B。更多还原

【Abstract】 In coherent optical orthogonal frequency division multiplexing(CO-OFDM) system,nonlinearity tolerance can be improved by reducing the signal peak-to-average power ratio(PAPR). Carrier interferometry(CI) and partial transmit sequence(PTS) are two typical PAPR reduction methods. In this paper, based on CI and PTS, an optimal method named advanced carrier interferometry(ACI) is newly analyzed in CO-OFDM system for nonlinearity tolerance improvement. Theoretical analysis and simulation results show that ACI could effectively reduce PAPR by 3.5d B, better than both CI and PTS. A 25 Gbps signal transmission with 16QAM-OFDM modulation format over a 1000-km standard single-mode fiber transmission system is established,and simulation results prove that ACI could effectively improve the system nonlinearity tolerance by 1d B while BER performance is barely effected.更多还原