基于SIPM-SPM调制的ACO-OFDM系统性能分析  

Performances of ACO-OFDM System Based on SIPM-SPM Modulation

作　　者：邱林阳 陈琳 余兆博 杨文鑫 徐梓元 黄怿[2] QIU Lin-yang;CHEN Lin;YU Zhao-bo;YANG Wen-xin;XU Zi-yuan;HUANG Yi(College of Electronics and Information Engineering,Shanghai University of Electric Power,Shanghai 201306,China;Key Laboratory of Specialty Fiber Optics and Optical Access Networks,Shanghai University,Shanghai 200444,China)

机构地区：[1]上海电力大学电子与信息工程学院,上海201306 [2]上海大学特种光纤与光接入网省部共建重点实验室,上海200444

出　　处：《光学与光电技术》2023年第4期90-97,共8页Optics & Optoelectronic Technology

基　　金：上海市科委重点实验室项目资助(SKLSFO2021-02);上海市自然科学基金(22ZR142300)资助项目。

摘　　要：针对DCO-OFDM系统功率效率低以及高阶信号调制复杂度高的问题,提出一种联合子载波索引和功率叠加复用(Subcarrier Index-Power Modulated With Superposition Multiplexing,SIPM-SPM)的新型信息承载维度,将其应用于非对称限幅光正交频分复用(Asymmetrically Clipped Optical OFDM,ACO-OFDM)系统。该调制技术对高功率子载波采用SPM,添加两个8PSK和QPSK编码的复值数据,进一步增加了信号的传输容量,同时ACO-OFDM系统避免了直流偏置带来的功率损耗。仿真结果显示:在ACO-OFDM系统中,SIPM-SPM相较于SIPM(8-PSK/QPSK),信号传输容量提高了28.6%;相较于相同信号传输容量的SIPM(32-PSK/QPSK),在误码率为1.0×10^(-3)时,信噪比增益>2.8 dB,色散容忍度提高了>560 ps/nm,光发射功率动态范围提高了>6.7 dB。这表明将SIPM-SPM调制应用于ACO-OFDM系统,具有较好的抗噪声性能和较高色散容忍度,也降低了对发射光功率的需求。In order to improve the low power efficiency of DCO-OFDM system and reduce the high complexity caused by high-order signal modulation,subcarrier index-power modulated with superposition multiplexing(SIPM-SPM)is applied to asymmetrically clipped optical orthogonal frequency division multiplexing(ACO-OFDM)system.The proposed signal transmission technique adopts SPM to add two complex data encoded by 8PSK and QPSK for the high power subcarriers,which further increases the transmission capacity and avoids the power loss caused by DC bias in ACO-OFDM system.Simulation results that in ACO-OFDM system,compared with SIPM(8-PSK/QPSK),the signal transmission capacity of SIPM-SPM is increased by 28.6%.Compared with SIPM(32-PSK/QPSK)with the same signal transmission capacity,when the bit error rate is 1.0×10^(-3),the signal-to-noise ratio gain is>2.8 dB,the dispersion tolerance is increased by>560 ps/nm,and the optical launch power dynamic range is improved by>6.7 dB.It is shown that the combination of SIPMSPM modulation and ACO-OFDM system improves the noise resistance performance,high dispersion tolerance and reduces the demand for optical launch power.

关 键 词：光正交频分复用 数字信号处理 非对称限幅 子载波功率索引 功率叠加复用 

分 类 号：TN914[电子电信—通信与信息系统]