Fiber nonlinearity mitigation by PAPR reduction in coherent optical OFDM systems via biased clipping OFDM  

作　　者：郝耀鸿 李玉权 王荣 黄卫卫 

机构地区：[1]PLA Institute of Physical Education [2]Institute of Communications Engineering, PLA University of Science and Technology

出　　处：《Chinese Optics Letters》2012年第1期16-19,共4页中国光学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China under Grant No.60871075

摘　　要：A new method incorporating biased clipping orthogonal frequency division multiplexing （OFDM） is presented, which mitigates fiber nonlinear effects in a long-haul coherent optical OFDM （CO-OFDM） system. Under the scheme of the method, the wanted signal carried by odd subcarriers is orthogonal to clipping noise and a Mach-Zehnder modulator （MZM） performs the optimal OFDM signal up-converter from the radio frequency （RF） domain to the optical domain. Analysis and simulation results show that fiber non- linear effects can be effectively mitigated by reducing the peak-to-average power ratio （PAPR） in biased clipping CO-OFDM system. The nonlinearity threshold （NLT） is improved by 5 dB with a reach of 240 km. With a fiber length up to 800 km, system Q value is improved by approximately 2.3, 1.2, and 0.6 dB at a chromatic dispersion of 6, 12, and 16 ps/（nm.km）, respectively. Additionally, system Q reaches the maximum when direct currect （DC） bias is equal to the mean value of the OFDM waveform.A new method incorporating biased clipping orthogonal frequency division multiplexing （OFDM） is presented, which mitigates fiber nonlinear effects in a long-haul coherent optical OFDM （CO-OFDM） system. Under the scheme of the method, the wanted signal carried by odd subcarriers is orthogonal to clipping noise and a Mach-Zehnder modulator （MZM） performs the optimal OFDM signal up-converter from the radio frequency （RF） domain to the optical domain. Analysis and simulation results show that fiber non- linear effects can be effectively mitigated by reducing the peak-to-average power ratio （PAPR） in biased clipping CO-OFDM system. The nonlinearity threshold （NLT） is improved by 5 dB with a reach of 240 km. With a fiber length up to 800 km, system Q value is improved by approximately 2.3, 1.2, and 0.6 dB at a chromatic dispersion of 6, 12, and 16 ps/（nm.km）, respectively. Additionally, system Q reaches the maximum when direct currect （DC） bias is equal to the mean value of the OFDM waveform.

关 键 词：Fibers Light modulators Telecommunication systems 

分 类 号：TN919.3[电子电信—通信与信息系统] O437[电子电信—信息与通信工程]