Digital Frequency-Domain MIMO Equalizer Enabling Six-LP-Mode Strong-Coupling IM/DD MDM Optical Transmission System

作     者：Long, Jianyu Wang, Chen Wu, Ying Sang, Bohan Bian, Chengzhen Yang, Xiongwei Zhang, Long Chen, Yifan Zhang, Qinyi Wang, Ying Li, Yichen Zhou, Wen Wang, Kaihui Liu, Bo Shen, Lei Yu, Jianjun 

作者机构：Fudan Univ Sch Informat Sci & Technol State Key Lab AS & Syst Key Lab Informat Sci Electromagnet Waves MoE Shanghai 200433 Peoples R China Nanjing Univ Informat Sci & Technol Inst Opt & Elect Nanjing 210044 Peoples R China Yangtze Opt Fiber & Cable Joint Stock Ltd Co YOFC Wuhan 430073 Peoples R China 

出 版 物：《SENSORS》 (Sensors)

年 卷 期：2025年第25卷第8期

页      面：2562-2562页

核心收录：

学科分类：0710[理学-生物学] 071010[理学-生物化学与分子生物学] 0808[工学-电气工程] 07[理学] 0804[工学-仪器科学与技术] 0703[理学-化学] 

基　　金：National Key R&D Program of China National Natural Science Foundation of China [62127802, 62331004, 62305067, U24B20142, U24B20168, 62427815] Key Project of Jiangsu Province of China [BE2023001-4] 2023YFB2805302 

主　　题：digital signal processing intensity modulation and direct detection mode division multiplexing multiple-input-multiple-output equalizer 

摘      要：Mode division multiplexing (MDM) techniques provide significant enhancement of the capacity of optical intensity modulation and direct detection (IM/DD) short-reach communication systems, like the datacenter interconnection scenarios. While the introduction of multiple modes leads to mode coupling that will extremely deteriorate the received signals, two approaches have been explored to address this issue: one involves the application of all-link weakly coupled components to suppress modal crosstalk, while the other utilizes optical multiple-input-multiple-output (MIMO) equalizers based on optical devices for signal decoupling. However, pure digital signal processing (DSP)-based schemes for mode decoupling in IM/DD MDM systems with strong mode coupling remain unexplored. In this paper, we propose to use a frequency-domain MIMO equalizer for compensating the modal interference in the strong-coupling linear-polarized (LP) MDM IM/DD system. The signal recovery capability of the proposed method is verified through numerical simulation. Finally, we successfully experimentally demonstrate the transmission of on-off-key (OOK) signals in a six-LP-mode strong-coupling MDM IM/DD system over a 10 km few-mode fiber, employing a pair of strong-coupling mode multiplexers/demultiplexers. The experimental results indicate that, with the frequency-domain MIMO equalizer, OOK signals from all modes can be recovered with an 11% hard-decision forward error correction threshold of 8.3 x 10-3. The proposed method facilitated by flexible DSP software offers an alternative for short-reach communication systems and has the potential to advance the practical application of MDM techniques in the future.