MLSE-assisted decision feedback equalizer for error-propagation suppression in high-speed IM-DD transmission systems
Jiahao Zhou, Jing Zhang, Xue Song Zhao, Rui Wang, Jinjiang Li, Shaohua Hu, Qianwu Zhang, Qi Yang, Bo Xu, Kun Qiu · Chinese Optics Letters · 2024
We propose a trellis-compressed maximum likelihood sequence estimation (TC-MLSE)-assisted sliding-block decision feedback equalizer (DFE) to suppress the error propagation resulting from the DFE in high-speed systems.We use an out-ofrange detector to detect the end of burst errors from the DFE and activate the optional TC-MLSE to correct burst errors.We conduct experiments to transmit a 201-Gbit/s PAM-8 signal.The results show that the proposed method achieves a bit error rate of 3.65 × 10 -3 , which is close to that of MLSE.The optional MLSE is only activated when needed and processes 11.4% of the total symbols.Moreover, the proposed method compresses the maximum length of burst errors from 19 to 5.