The nonlinear compensation algorithm based on Volterra series has been proved effective in low order modulation OFDM system, such as QPSK/16QAM. In this paper, we demonstrate a 64QAM/ 128QAM DFT-S-OFDM signal generation with DML with some advanced algorithms such as DD-LMS, ISFA, DFT-S and nonlinear compensation to improve the signal performance. For the first time we demonstrate that the nonlinear compensation algorithm based on Volterra series can improve the performance of the high-order modulation DFT-S-OFDM signal such as 64QAM and 128QAM. In this experiment we have realized 19.1/11.2Gb/s 64/128QAM signal transmission over 15km fiber at 1307nm. For 64QAM case, the receiver sensitivity can be improved about 1dB when all the algorithms mentioned in this paper are adopted. And the BER can be improved from 4.7x10-3 to 2.8x10-3 at 7.0dBm for 128QAM signal, which reaches the HD-FEC threshold of 3.8x10-3.
Kaihui Wang, Chaoyi Qin, Jiangnan Xiao, Nan Chi, and Jianjun Yu, "Nonlinear compensation for high-order modulation signal in a IM/DD DFT-S-OFDM system with directly modulated laser," Proc. SPIE 10129, Optical Metro Networks and Short-Haul Systems IX, 101290D (Presented at SPIE OPTO: February 02, 2017; Published: 28 January 2017); https://doi.org/10.1117/12.2251251.
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