首页|基于时频域联合数据辅助MIMO均衡算法的多维度复用千公里级相干传输系统

基于时频域联合数据辅助MIMO均衡算法的多维度复用千公里级相干传输系统

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基于少模光纤的模式复用系统利用单根纤芯中的正交模式实现各独立信道的并行传输,能够有效提升系统容量,解决单模光纤系统的容量危机.本文联合使用模式复用、波分复用与偏振复用技术,基于六模渐变型光纤实现了80个波长通道下32 Gbaud四模双偏振16阶正交振幅调制信号的1 000 km相干传输,并在接收端使用时频域联合数据辅助8×8多输入多输出最小均方算法,以补偿由光纤传输导致的模式耦合及模间色散等线性损伤.与传统的纯时域或纯频域多输入输出最小均方均衡算法相比,该算法分别实现了57.1%的收敛速度提升与25.1%的收敛误差下降.经过1 000 km少模光纤传输后,80通道每个模式及偏振态的误码率均低于开销为20%的软判决前向纠错编码阈值2.4×10-2,系统净速率达68.2 Tbit/s.
Multidimensional Multiplexed Coherent Transmission System Based on Joint Time-Frequency Domain Data-Assisted MIMO Equalization
The mode division multiplexing(MDM)system based on the few mode fiber(FMF)can realize the paral-lel transmission of different independent channels by using the orthogonal modes in a single fiber core,which can effective-ly improve the system capacity and solve the"capacity crunch"of the single mode fiber(SMF)system.In this paper,we re-alize the transmission of the 32 Gbaud four-mode dual-polarization 16-ary quadrature amplitude modulation(16QAM)sig-nals in 80 wavelength channels over 1000 km six-mode graded-index fiber by using jointly the MDM,wavelength division multiplexing(WDM)and polarization division multiplexing(PDM)techniques.In addition,we use the hybrid time-fre-quency domain data-assisted 8×8 multiple-input multiple-output(MIMO)least mean square(LMS)equalization at the re-ceiver to compensate for the linear damages such as the mode coupling(MC)and differential mode group delay(DMGD)caused by the fiber transmission.Compared with the commonly used time-domain or frequency-domain MIMO-LMS equalization,the joint use of time and frequency domain can realize 57.1%improvement in convergence speed and 25.1%reduction in convergence error.After 1 000 km delivery of FMF,the bit error ratio(BER)of each mode and polarization state of all the 80 channels is lower than the 20%soft-decision forward error correction(SD-FEC)threshold of 2.4×10-2,and the net transmission rate is up to 68.2 Tbit/s.

coherent optical transmission systemmultidimensional multiplexed techniquedata-assisted equaliza-tionmultiple-input multiple-output equalizationhybrid time-frequency domain processing technique

刘博、王晨、谭宇璇、王凯辉、丁俊杰、朱博文、田凤、沈磊、张磊、王瑞春、闫长鹍、陈伟章、叶兵、任建新、李凡、邓磊、李建平、秦玉文、李朝晖、忻向军、余建军

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北京邮电大学,北京 100876

复旦大学信息科学与工程学院,上海 200433

南京信息工程大学,江苏南京 210044

长飞光纤光缆股份有限公司,湖北武汉 430073

中兴通讯,北京 100971

中山大学,广东广州 510275

华中科技大学,湖北武汉 430074

广东工业大学,广东广州 510006

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相干光传输系统 多维度复用技术 数据辅助均衡 多输入多输出数据均衡 时频域联合处理技术

国家重点研发计划国家自然科学基金国家自然科学基金国家自然科学基金国家自然科学基金

2018YFB180090561935005617201060156183500262127802

2024

电子学报
中国电子学会

电子学报

CSTPCD北大核心
影响因子:1.237
ISSN:0372-2112
年,卷(期):2024.52(5)