中文摘要：

协调光直角的频率部门 multiplexing 系统(CO-OFDM ) 被介绍的有信号抓紧在长拖改进纤维非线性忍耐的一个改进零插值的方法。新技术被插入内推实现零副载波并且选择奇怪的副载波带数据和抓紧的常规 CO-OFDM 在零点发信号。与如此的一个计划，纤维非线性的效果能被减轻，并且想要的信号继续奇怪的副载波对抓紧噪音直角，它落在甚至频率上。系统 Q 值被超过 2 dB 在 960 km 的长度改进的模拟表演

英文摘要：

An improved zero-interpolation method with signal clipping to improve fiber nonlinearity tolerance in the long-haul coherent optical orthogonal frequency division multiplexing system （CO-OFDM） is presented. The new technique is implemented by interpolating zero subcarriers and selecting the odd subcarriers to carry data and clipping conventional CO-OFDM signal at zero. With such a scheme,the effect of fiber nonlinearity can be miti-gated,and the wanted signal carried on odd subcarriers is or-thogonal to clipping noise,which falls on even frequencies. Simu-lation shows that the system Q value is improved by more than 2 dB at the length of 960 km