Partial response THP for high-speed PAM-4 transmission

被引：1
|
作者：
Ke, Junchi [1 ]
Gao, Mingyi [1 ]
Chen, Bowen [1 ]
Shao, Weidong [1 ]
机构：
[1] Soochow Univ, Jiangsu Engn Res Ctr Novel Opt Fiber Technol & Com, Sch Elect & Informat Engn, Suzhou Key Lab Adv Opt Commun Network Technol, 1 Shizi St, Suzhou 215006, Jiangsu, Peoples R China
来源：
OPTICAL FIBER TECHNOLOGY | 2023年 / 81卷
基金：
中国国家自然科学基金;
关键词：
Pulse -amplitude modulation; Direct detection faster than Nyquist; Partial response coding; Tomlinson-Harashima precoding; Colored noise; SYSTEM; SIGNAL;
D O I：
10.1016/j.yofte.2023.103487
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
Intensity-modulation direct-detection (IM/DD) pulse-amplitude modulation (PAM-4) signals are promising for high-speed data center networks. However, high-speed PAM-4 signals always are subject to critical impairments due to the bandwidth constraint. In the conventional PAM-4 system, a direct detection-faster than Nyquist (DD-FTN) with high complexity is usually appended to the feed-forward equalizer (FFE) for colored noise suppression to maximize transmission performance. In order to yield a simple PAM-4 scheme with similar performance as that of the DD-FTN, we proposed a nonlinear differential coding-generalized Tomlinson-Harashima Precoding (NLDC-GTHP) PAM-4 system. The proposed system consists of a NLDC-GTHP at the transmitter and a simplified two-dimensional constellation distortion (S2DCD) module at the receiver. We experimentally demonstrated the proposed NLDC-GTHP PAM-4 system for 62.5-Gb/s PAM-4 signal transmission over 2-km standard single mode fiber (SSMF) with the 10-dB bandwidth of about 12 GHz. By introducing the NLDC-GTHP and S2DCD, we achieved the similar receiver sensitivity as that of the DD-FTN at the hard-decision forward-error-correction (HD-FEC) bit error rate (BER) threshold, with the decrease of 86% computational complexity.
引用
收藏
页数：8
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