Adaptive Dispersion Estimation for Linearized Electronic Dispersion Compensation in IM-DD Systems  

作　　者：Huo Jiahao Tao Jianlong Zhang Xiaoying Zhu Jin Qin Peng Wei Huangfu 

机构地区：[1]School of Computer and Communication Engineering,University of Science and Technology,Beijing 100083,China

出　　处：《China Communications》2025年第4期55-64,共10页中国通信(英文版)

基　　金：funded by the National Natural Science Foundation of China NSFC,U22A2005 and 62201033;theYoung Elite Scientists Sponsorship Program of CIC 2021QNRC001。

摘　　要：An adaptive dispersion estimation(ADE)is proposed to compensate dispersion and estimate the transfer function of the fiber channel with GerchbergSaxton(G-S)algorithm,using the stochastic gradient descent(SGD)method in the intensity-modulation and direct-detection(IM-DD)system,improving the tolerance of the algorithm to chromatic dispersion(CD).In order to address the divergence arising from the perturbation in the amplitude of the received signal caused by the filtering effect of the non-ideal channels,a channel-compensation equalizer(CCE)derived from the back-to-back(BTB)scenario is employed at the transmitter to make the amplitude of the received signal depicting the CD effect more accurately.The simulation results demonstrate the essentiality of CCE for the convergence and performance improvement of the G-S algorithm.Results show that it supports 112Gb/s four-level pulse amplitude modulation(PAM4)over 100 km standard single-mode fiber(SSMF)transmission under the 7%forward error correction(FEC)threshold of 3.8E-3.Besides,ADE improves the tolerance to wavelength drift from about 4 nm to 42 nm,and there is a better tolerance for fiber distance perturbation,indicating the G-S algorithm and its derived algorithms with the ADE scheme exhibit superior robustness to the perturbation in the system.

关 键 词：chromatic dispersion digital signal process intensity modulation and direct detection 

分 类 号：TN929.1[电子电信—通信与信息系统]