SVM for Constellation Shaped 8QAM PON System

• 作者: LI Zhongya CHEN Rui HUANG Xingang ZHANG Junwen NIU Wenqing LU Qiuyi CHI Nan
• 来源期刊: 中兴通讯技术（英文版）
• 年，卷（期）: 2022,（z1）
• 所属期刊栏目: Research Paper
• 页码范围: 64-71
• 页数: 8页
• 语种: 英文
• DOI: 10.12142/ZTECOM.2022S1009

摘要

Nonlinearity impairments and distortions have been bothering the bandwidth constrained passive optical network (PON) system for a long time and limiting the develop?ment of capacity in the PON system. Unlike other works concentrating on the exploration of the complex equalization algorithm, we investigate the potential of constellation shap?ing joint support vector machine (SVM) classification scheme. At the transmitter side, the 8 quadrature amplitude modulation (8QAM) constellation is shaped into three designs to mitigate the influence of noise and distortions in the PON channel. On the receiver side, simple multi-class linear SVM classifiers are utilized to replace complex equalization methods. Simulation results show that with the bandwidth of 25 GHz and overall bitrate of 50 Gbit/s, at 10 dBm input optical power of a 20 km standard single mode fiber (SSMF), and under a hard-decision forward error correction (FEC) threshold, transmission can be realized by employing Circular (4, 4) shaped 8QAM joint SVM classifier at the maximal power budget of 37.5 dB.