Phase pre-emphasis for PAPR reduction in optical OFDM systems based on OIDFT or time lens  

作　　者：邵晶 李蔚 梁晓军 

机构地区：[1]Wuhan National Lab for Optoelectronics, Huazhong University of Science and Technology

出　　处：《Chinese Optics Letters》2010年第9期875-880,共6页中国光学快报（英文版）

基　　金：supported by the National "973"the Program of China (Nos. 2010CB328300 and 2010CB328305);the National Natural Science Foundation of China (No. 60772013);the National "863"program of China (No. 2009AA03Z408)

摘　　要：Phase pre-emphasis is theoretically studied and introduced to reduce peak-to-average power ratio （PAPR） in optical orthogonal frequency division multiplexing （OFDM） systems. In intensity modulated （IM） systems, simulations show noticeable PAPR reductions： 4.14 dB （N = 16） and 15.48 dB （N = 512） in time lens-based OFDM, N is the number of subcarriers. An equation is developed to calculate phase values and is proved to be effective. Optical implementing methods are proposed and analyzed. In a time lens-based OFDM system, phase pre-emphasis reduces fiber nonlinearity and results in a 5.2-dB increase of launch power at the bit error rate （BER） of 10 ？6 . Simulations also show similar PAPR reduction and fiber nonlinearity mitigation in optical inverse discrete Fourier transformer （OIDFT） based OFDM systems.Phase pre-emphasis is theoretically studied and introduced to reduce peak-to-average power ratio （PAPR） in optical orthogonal frequency division multiplexing （OFDM） systems. In intensity modulated （IM） systems, simulations show noticeable PAPR reductions： 4.14 dB （N = 16） and 15.48 dB （N = 512） in time lens-based OFDM, N is the number of subcarriers. An equation is developed to calculate phase values and is proved to be effective. Optical implementing methods are proposed and analyzed. In a time lens-based OFDM system, phase pre-emphasis reduces fiber nonlinearity and results in a 5.2-dB increase of launch power at the bit error rate （BER） of 10 ？6 . Simulations also show similar PAPR reduction and fiber nonlinearity mitigation in optical inverse discrete Fourier transformer （OIDFT） based OFDM systems.

关 键 词：Bit error rate Frequency allocation Lenses Optical instruments Orthogonal functions Telecommunication systems 

分 类 号：TN919.3[电子电信—通信与信息系统]