摘要
研究了单载波光IM-DD(强度调制-直接检测)系统的频域均衡方案,通过分析时域与频域单载波信号ISI(码间干扰)的关系,提出一种通过时域截取的方法减弱噪声影响的均衡器抽头更新方式,并通过仿真对截取位置和符号个数的选取进行了优化。仿真结果表明,10Gbit/s NRZ-OOK(非归零码-开关键控)信号经过100km传输后,相对于传统时域均衡方案,频域均衡方案所需要的光信噪比需求可降低约2dB。
This paper studies the frequency domain equalization scheme for single carrier optical intensity modulation direct detection system. Through theoretical analysis on the relationship between the time and frequency domain inter-symbol interference for single carrier signal, a time domain clipping based channel equalizer with new tap updating method is proposed to reduce the effect of noise. The optimal clipping position and symbol number are selected through numerical simulations. The simulation results show that compared with conventional time domain channel equalization, the required OSNR can be reduced by almost 2 dB through frequency domain channel equalization after 100 km transmission of 10 Gbit/s NRZ-OOK signals.
作者
陆继钊
姬发家
胡荣
程燕
LU Ji-zhao JI Fa-jia HU Rong CHENG Yan(Information and Communication Company, State Grid Henan Electric Power Company, Zhengzhou 450018, China Wuhan Research Institute of Post and Telecommunications, Wuhan 430074, China)
出处
《光通信研究》
北大核心
2016年第4期5-7,共3页
Study on Optical Communications
关键词
光强度调制
直接检测
频域均衡
optical intensity modulation
direct detection
frequency domain equalization
