32.768 Tbit/s净速率1000 km长少模光纤波分复用系统  

1000-km-Long Few-Mode Fiber Wavelength Division Multiplexing Transmission System with Net Rate of 32.768 Tbit/s

作　　者：雎洲 王晨[1] 王凯辉 丁俊杰 朱博文 沈磊 张磊 王瑞春 闫长鹍 刘博 余建军[1] Ju Zhou;Wang Chen;Wang Kaihui;Ding Junjie;Zhu Bowen;Shen Lei;Zhang Lei;Wang Ruichun;Yan Changkun;Liu Bo;Yu Jianjun(School of Information Science and Technology,Fudan University,Shanghai 200433,China;Changfei Optical Fiber and Cable Joint Stock Limited Company,Wuhan 430073,Hubei,China;Nanjing University of Information Science&Technology,Nanjing 210044,Jiangsu,China)

机构地区：[1]复旦大学信息科学与工程学院,上海200433 [2]长飞光纤光缆股份有限公司,湖北武汉430073 [3]南京信息工程大学,江苏南京210044

出　　处：《光学学报》2023年第10期38-45,共8页Acta Optica Sinica

基　　金：国家科技部重点研发项目(2018YFB1800905);国家自然科学基金(61935005,61720106015,61835002,62127802)。

摘　　要：为了满足日益增长的数据需求,实现“超大容量、超长距离”通信,结合波分复用、偏振复用、模式复用3种复用技术,演示了一个少模光纤传输系统。实验生成符合ITU-T标准的80个通道,利用两个正交偏振及LP11a、LP11b两个模式,在最长达1000 km的少模光纤上传输32 GBaud的16QAM信号。为了减少色散效应和严重的偏振间、模间串扰产生的影响,在接收端数字信号处理(DSP)中,采用基于时域和频域的多输入多输出(MIMO)均衡解复用技术,显著提升系统性能。实验结果表明,经500/1000 km的少模光纤传输,系统的比特误码率(BER)分别能满足7%低密度奇偶校验码(LDPC)硬判决门限(3.8×10^(-3))和25%LDPC软判决门限(4.2×10^(-2))。当少模光纤传输距离为1000 km时,系统实现的净速率为32.768 Tbit/s,属于国内领先水平。Objective With the rapid development of technologies,such as the Internet and artificial intelligence,there has been an exponential increase in the demand for data from all areas of life.However,the capacity of traditional single-mode fiber(SMF)networks is approaching the Shannon limit.Consequently,several multiplexing technologies,including wavelength division multiplexing(WDM),polarization division multiplexing(PDM),and mode division multiplexing(MDM),have been explored to meet the growing data demand.In MDM,using few-mode fiber(FMF)for long-distance transmission is more cost effective than using multimode fiber(MMF)because of the lower nonlinear impairment.Moreover,MDM introduces severe crosstalk between different modes,which must be compensated for by advanced DSP algorithms on the receiver side.In China,most ongoing studies on MDM transmission employ the intensity modulation direct detection(IMDD)method,which is suitable for only short-distance transmissions.The number of modes that can be effectively exploited is also too small,making it difficult to achieve"ultrahigh-capacity"communication.In this study,we developed a high-capacity long-distance FMF transmission system that combines WDM,PDM,and MDM technologies.Eighty channels that satisfy the ITU-T standard are generated,and 32-GBaud 16QAM signals are transmitted up to 1000-km FMF on dual polarization and two modes(LP11a and LP11b).Multiple input multiple output(MIMO)equalization demultiplexing algorithms based on time domain(TD)and frequency domain(FD)are adopted,which can greatly improve system performance.For a transmission distance of 1000 km,the net data rate reaches 32.768 Tbit/s,which is the highest recorded rate in China.Methods In this experiment,we used strong coupling graded-index FMF that can support the transmission of six modes and we chose two degenerate modes,including LP11a and LP11b.At the transmitter side,80 external cavity lasers generate 1530-1562 nm light waves with a 50-GHz frequency spacing.The digital baseband signal is generated

关 键 词：光通信 少模光纤 波分复用 MIMO均衡 大容量传输 长距离通信 

分 类 号：O436[机械工程—光学工程]