Nonlinear impairment compensation for DFT-S OFDM signal transmission with directly modulated laser and direct detection

详细信息    查看全文

• 作者：Pengqi Gou ; Kaihui Wang ; Chaoyi Qin ; Jianjun Yu ; ^{jianjun@fudan.edu.cn}
• 关键词：Intensity modulation and direct detection (IM/DD) ; Orthogonal frequency division multiplexing (OFDM) ; Nonlinear equalization (NLE) ; Decision directed least mean square (DD-LMS)
• 刊名：Optics Communications
• 出版年：2017
• 出版时间：15 March 2017
• 年：2017
• 卷：387
• 期：Complete
• 页码：188-190
• 全文大小：871 K
• 卷排序：387

文摘

We experimentally demonstrate a 16QAM DFT-spread OFDM system based on DML and direct detection. A series of DSP algorithms including ISFA(intra-symbol frequency averaging ), DD-LMS (decision-directed least mean square) and NLE (nonlinear equalization) are implemented to improve the system performance. For 20-Gbaud 16QAM-OFDM signal, with the aid of NLE, we respectively provide 6.2-dB and 5.2-dB receiver sensitivity improvement under HD-FEC threshold of 3.8×10-3 for the back-to-back case and transmission over 10-km SSMF case, related to only adopt post-equalization scheme. To our knowledge, this is the first time to use dynamic nonlinear equalizer based on the summation of the square of the difference between samples in IM/DD OFDM system with DML to mitigate nonlinear distortion.