Improved SD-FEC with multi-tap error-tracking DFE with partial unrolling in high-speed IM/DD systems

作     者：Xue Zhao Jing Zhang Jiahao Zhou Chenye Wang Zhengyu Ma Shaohua Hu Bo Xu Kun Qiu 赵雪;张静;周家豪;王晨烨;马正雨;胡少华;许渤;邱昆

作者机构：Key Laboratory of Optical Fiber Sensing and Communications(Ministry of Education)School of Communication and Information EngineeringUniversity of Electronic Science and Technology of ChinaChengdu 611731China 

出 版 物：《Chinese Optics Letters》 (中国光学快报(英文版))

年 卷 期：2025年第23卷第1期

页      面：25-30页

核心收录：

学科分类：07[理学] 08[工学] 070104[理学-应用数学] 081101[工学-控制理论与控制工程] 0701[理学-数学] 0811[工学-控制科学与工程] 

基　　金：supported by the National Natural Science Foundation of China(Nos.62301128 and U22A2086) the STCSM(No.SKLSFO2021-01) the Open Fund of IPOC(BUPT)(No.IPOC2020A011) the Fundamental Research Funds for the Central Universities(Nos.ZYGX2020ZB043 and ZYGX2019J008) 

主　　题：decision feedback equalizer error propagation tracking look-up table log-likelihood ratio intensity modulation and direct detection 

摘      要：We propose a multi-tap look-up-table(LUT)-based error-tracking decision feedback equalizer with partial unrolling(ET-DFEPU)algorithm to improve log-likelihood ratio(LLR)quality with error *** introduce an error-tracking model to obtain the probabilities of different error states,which are input into the decoder to obtain more accurate *** also use LUTs to reduce the computation complexity of ***,we adopt a low-complexity partially unrolled architecture to relax the feedback timing *** conduct experiments to transmit 170-Gb/s 4-ary pulse amplitude modulation signal in intensity modulation and direct-detection system at *** results show that the proposed method can achieve 3-d B receiver sensitivity improvement at the same post-forward error correction bit error ratio compared with the conventional DFE.