Joint clock recovery and feed-forward equalization for PAM4 transmission Zhou, Honghang ; Li, Yan ; Lu, Dan ; Yue, Lei ; Gao, Chao ; Liu, Yuyang ; Hao, Ruibin ; Zhao, Zhixi ; Li, Wei ; Qiu, Jifang ; Hong, Xiaobin ; Guo, Hongxiang ; Zuo, Yong ; Wu, Jian Abstract Publication: Optics Express Pub Date: April 2019 DOI: 10.1364/OE.27.011385 Bibcode: 2019OExpr..2711385Z