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ZTE Communications ›› 2022, Vol. 20 ›› Issue (S1): 64-71.DOI: 10.12142/ZTECOM.2022S1009

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  • 收稿日期:2021-07-25 出版日期:2022-01-25 发布日期:2022-03-01

SVM for Constellation Shaped 8QAM PON System

LI Zhongya1,3,, CHEN Rui2,3,, HUANG Xingang2, ZHANG Junwen1,3,, NIU Wenqing1,3,, LU Qiuyi1,3,, CHI Nan1()   

  1. 1.Key Laboratory for Information Science of Electromagnetic Waves, Fudan University, Shanghai 200433, China
    2.ZTE Corporation, Shenzhen 518057, China
    3.Department of Communication Science and Engineering, School of Information Science and Technology, Fudan University, Shanghai 200433, China
    the Department of Communication Science and Engineering, School of Information Science and Technology, Fudan University, China
  • Received:2021-07-25 Online:2022-01-25 Published:2022-03-01
  • About author:LI Zhongya is with the Department of Communication Science and Engineering, School of Information Science and Technology, Fudan University, China.|CHEN Rui is with the Department of Communication Science and Engineering, School of Information Science and Technology, Fudan University, China.|HUANG Xingang is a senior expert of technical pre-research of ZTE Corporation. He received the M.S. degree in physics from Xi’an Jiaotong University, China in 2008. He is engaged in the research of optical access technology, especially in WDM-PON, TWDM-PON, NG-EPON, 50 G PON.|ZHANG Junwen is with the Department of Communication Science and Engineering, School of Information Science and Technology, Fudan University, China.|NIU Wenqing is with the Department of Communication Science and Engineering, School of Information Science and Technology, Fudan University, China.|LU Qiuyi is with the Department of Communication Science and Engineering, School of Information Science and Technology, Fudan University, China.|CHI Nan (nanchi@fudan.edu.cn) is with the Department of Communication Science and Engineering, School of Information Science and Technology, Fudan University, China.
  • Supported by:
    the NSFC project(61925104);ZTE Industry?Academia?Research Cooperation Funds(HC?CN?20191231006)

Abstract:

Nonlinearity impairments and distortions have been bothering the bandwidth constrained passive optical network (PON) system for a long time and limiting the development of capacity in the PON system. Unlike other works concentrating on the exploration of the complex equalization algorithm, we investigate the potential of constellation shaping 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.

Key words: passive optical networks, support vector machine, geometrically shaping, constellation classification, digital signal processing