高线宽容忍度的高谱效SSB-PAM-DD方案  

High spectral efficiency SSB-PAM-DD scheme with high linewidth tolerance

作　　者：卢东旭 周娴 刘飞[1] 霍佳皓 苑金辉 隆克平[1] LU Dongxu;ZHOU Xian;LIU Fei;HUO Jiahao;YUAN Jinhui;LONG Keping(School of Computer and Communication Engineering,University of Science and Technology Beijing,Beijing 100083,China;Shunde Graduate School,University of Science and Technology Beijing,Foshan 528300,China)

机构地区：[1]北京科技大学计算机与通信工程学院,北京100083 [2]北京科技大学顺德研究生院,广东佛山528300

出　　处：《通信学报》2022年第5期36-44,共9页Journal on Communications

基　　金：国家重点研发计划基金资助项目(No.2019YFB1803905);国家自然科学基金资助项目(No.61871030,No.62171022);广东基础与应用基础研究基金资助项目(No.2021B1515120057);北京市自然科学基金资助项目(No.4222009);北京科技大学顺德研究生院科技创新基金资助项目(No.BK19AF005)。

摘　　要：针对低成本下的高色散(CD)稳健性单边带(SSB)直接检测(DD),对3种单边带脉冲幅度调制方案进行了分析,其中在发射端加入下变频的方案可获得最大频谱利用率,但恶化了系统对激光器线宽的容忍度。鉴于此,根据单边带脉冲幅度调制信号的特性,提出了一种包含相位损伤免疫均衡算法和改进盲相位补偿算法的数字信号处理方案。仿真结果表明,针对112 Gbit/s的单边带脉冲幅度直接检测,无论是背靠背还是传纤80 km场景,在同一误码率阈值下改进方案可容忍线宽为1 MHz,而原始方案仅为100 kHz,实现了高谱效、高线宽容忍度的低成本单边带脉冲幅度调制信号传输。For low-cost and high chromatic dispersion(CD)robustness single sideband(SSB)with direct detection(DD),three schemes of SSB with pulse amplitude modulation(PAM)were investigated.Among that,the highest spectral efficiency was achieved by the scheme of adding the frequency down-conversion at the transmitter.However,that scheme reduces the tolerance for laser linewidth.Hence,based on the character of the SSB-PAM signal,a DSP scheme was proposed,including a modified equalization algorithm with phase distortion immunity and blind phase search algorithm.The simulation results show that the modified scheme can tolerate 1 MHz linewidth for 112 Gbit/s SSB-PAM-DD,while the original scheme for SSB-PAM was only 100 kHz at the same bit error rate(BER)threshold.Therefore,the proposed scheme can achieve a high frequency efficiency,high linewidth tolerance,and low-cost SSB-PAM signaling transmission.

关 键 词：单边带 脉冲幅度调制 直接检测 激光器线宽 信号均衡 相位补偿 

分 类 号：TN913[电子电信—通信与信息系统]