PAM-8 IM/DD Transmission Based on Modified Lookup Table Nonlinear Predistortion

IEEE Photonics Journal

Xiangjun Xin¹  Qi Zhang¹  Pengqi Gou²  Jianjun Yu²  Jiangnan Xiao²  Jiao Zhang²  Kaibo Fang²  Miao Kong² 

[1] Beijing University of Posts and Telecommunications, Beijing, China;Key Laboratory for Information Science of Electromagnetic Waves, Fudan University, Shanghai, China;

关键词: Pulse amplitude modulation (PAM);    intensity modulation and direct detection (IM/DD);    look-up table (LUT) nonlinear pre-distortion.;   

DOI  :  10.1109/JPHOT.2018.2828869

来源: DOAJ

【 摘 要 】

In this paper, a modified lookup table (LUT) nonlinear predistortion method is proposed. With the modified LUT method, the number of patterns and the computational complexity can be reduced by half with a similar system performance comparing with normal LUT. We experimentally demonstrate an 8-ary pulse amplitude modulation (PAM-8) intensity modulation and direct detection (IM/DD) transmission over 15-km fiber using a directly modulated laser (DML) based on modified LUT. Around 1-dB receiver sensitivity improvement at bit-error ratio of 3.8 × 10 ^-3 is achieved by adopting a modified LUT over 15-km fiber transmission at 2 Gbaud based on a commercial DML. In addition, we also experimentally demonstrate Mach-Zehnder modulator based 40 Gbaud PAM-8 IM/DD transmission under back-to-back case, about 1-dB receiver sensitivity can also be improved.

【 授权许可】

Unknown