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

Xue Zhao; Jing Zhang; Jiahao Zhou; Chenye Wang; Zhengyu Ma; Shaohua Hu; Bo Xu; Kun Qiu

doi:10.3788/COL202523.010605

Chinese Optics Letters, Volume. 23, Issue 1, 010605(2025)

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

Xue Zhao, Jing Zhang, Jiahao Zhou, Chenye Wang, Zhengyu Ma, Shaohua Hu^*, Bo Xu, and Kun Qiu

Key Laboratory of Optical Fiber Sensing and Communications (Ministry of Education), School of Communication and Information Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China

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Fig. 1. (a) Block diagram of ET-DFE; (b) error-tracking model of DFE.

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Fig. 2. Quantized and continuous PDF curves.

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Fig. 3. Block diagram of N-tap PAM-M. (a) ET-DFE-LU, (b) ET-DFE-PU.

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Fig. 4. Experimental setup of PAM4 IM/DD system.

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Fig. 5. (a) Post-FEC BER performance and the LUT size versus different intervals; (b) pre-FEC BER performance versus different ROPs; (c) post-FEC BER performance versus different ROPs; (d) LDPC performance for conventional DFE and LUT-based ET-DFE-PU.

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Xue Zhao, Jing Zhang, Jiahao Zhou, Chenye Wang, Zhengyu Ma, Shaohua Hu, Bo Xu, Kun Qiu, "Improved SD-FEC with multi-tap error-tracking DFE with partial unrolling in high-speed IM/DD systems," Chin. Opt. Lett. 23, 010605 (2025)

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