MLSE-assisted decision feedback equalizer for error-propagation suppression in high-speed IM-DD transmission systems

Jiahao Zhou; Jing Zhang; Xue Zhao; Rui Wang; Jinjiang Li; Shaohua Hu; Qianwu Zhang; Qi Yang; Bo Xu; Kun Qiu

doi:10.3788/COL202422.050604

Chinese Optics Letters, Volume. 22, Issue 5, 050604(2024)

MLSE-assisted decision feedback equalizer for error-propagation suppression in high-speed IM-DD transmission systems

Jiahao Zhou¹, Jing Zhang^1、*, Xue Zhao¹, Rui Wang¹, Jinjiang Li¹, Shaohua Hu¹, Qianwu Zhang², Qi Yang³, Bo Xu¹, and Kun Qiu¹

Author Affiliations

¹Key Laboratory of Optical Fiber Sensing and Communication, University of Electronic Science and Technology of China, Chengdu 611731, China

²Key Laboratory of Specialty Fiber Optics and Optical Access Networks, Shanghai University, Shanghai 200444, China

³School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China

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Fig. 1. Block diagram of the TC-MLSE-assisted SB-DFE.

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Fig. 2. Probability of successfully detecting the error propagation versus the OOR threshold in a 1 + αD channel with a PAM-8 signal.

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Fig. 3. Experimental setup of the IM-DD system.

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Fig. 4. BER performance of the TC-MLSE-assisted DFE versus the OOR threshold for the 67-Gbaud PAM-8 signal transmission at an ROP of 10 dBm.

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Fig. 5. (a) BER performance, (b) NGMI, and (c) burst error distribution of the 67-Gbaud PAM-8 signal transmission processed by different equalizers.

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Table 1. Complexity Comparison of Different Equalizers
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Table 1. Complexity Comparison of Different Equalizers
Equalizers Multiplication Number
K-tap FFE + (N + 1)-tap PF + N-tap DFE K + 2 × N
K-tap FFE + (L + 1)-tap PF + TC-MLSE K + P^(L+1) + L
TC-MLSE-assisted DFE K + P^(L+1) + 2 × N + L

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Jiahao Zhou, Jing Zhang, Xue Zhao, Rui Wang, Jinjiang Li, Shaohua Hu, Qianwu Zhang, Qi Yang, Bo Xu, Kun Qiu, "MLSE-assisted decision feedback equalizer for error-propagation suppression in high-speed IM-DD transmission systems," Chin. Opt. Lett. 22, 050604 (2024)

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