Abstract

We experimentally demonstrated a geometric shaped (GS) 64-ary amplitude phase shift keying (64-APSK) eigenvalue transmission. The signal is modulated on the scatter coefficient of a single eigenvalue and linear minimum mean square error (LMMSE) estimator is used to reduce the noise. The channel response is estimated by transmitting a normally distributed 64-APSK constellation through a communication link. Based on the polar coordinates distribution of the received constellation, the diameter distributions for each circle can be obtained so that circles with larger noise can obtain larger judgment width. After optimization, the experimental results show that the Q-factor gain is 1.13 dB under 22 dB received optical signal to noise ratio (OSNR) configuration and 0.88 dB after 900 km transmission compared with normally distributed APSK configuration.

© 2021 Optical Society of America

Probabilistic shaping and neural network-based optimization for a nonlinear frequency division multiplexing system

Jiacheng Wei, Lixia Xi, Xulun Zhang, Jiayun Deng, Shucheng Du, Xiaoguang Zhang, Wenbo Zhang, and Xiaosheng Xiao
Opt. Lett. 46(15) 3697-3700 (2021)

ASE noise mitigation with digital frequency offset loading for discrete spectrum nonlinear frequency division multiplexing systems

Yanfeng Bi, Hengying Xu, Yining Zhang, Chenglin Bai, Donghu Yao, Tingting Dong, HongBing Gao, Lishan Yang, and Lixia Xi
Opt. Lett. 48(21) 5707-5710 (2023)

Two-stage artificial neural network-based burst-subcarrier joint equalization in nonlinear frequency division multiplexing systems

Xinyu Chen, Hao Ming, Chenjia Li, Guangqiang He, and Fan Zhang
Opt. Lett. 46(7) 1700-1703 (2021)

Joint equalization of frequency offset and phase noise using two-stage cascaded extended Kalman filter for discrete spectrum 16/64APSK NFDM systems

Hongbing Gao, Hengying Xu, Tingting Dong, Donghu Yao, Yining Zhang, Chenglin Bai, Lishan Yang, Xusheng Li, Zukai Sun, and Yaxuan Fan
Opt. Express 32(4) 6366-6381 (2024)

Noise equalization scheme based on complex-valued ANN for multiple-eigenvalue modulated nonlinear frequency division multiplexing systems

Xiuhua Lv, Chenglin Bai, Qi Qi, Hengying Xu, Xueyuan Luo, Xinyu Chi, Lishan Yang, and LiXia Xi
Appl. Opt. 61(36) 10755-10765 (2022)