用于PAM4-to-QPSK格式转换网关节点的DNN辅助光几何星座成形PSK调制
DNN-assisted optical geometric constellation shaped PSK modulation for PAM4-to-QPSK format conversion gateway node
摘要：
提出了一种将四电平脉冲幅度调制转换为具有整形增益的正交相移键控调制格式的光网关，以利用非均匀相位噪声实现灵活的强度到相位映射。通过在接收器侧对生成的具有非均匀相位噪声的QPSK信号进行基于DNN的决策，可以节省光调制格式转换的功耗。原理验证实验已经表明，光学几何星座形状的QPSK调制信号从具有高斯分布噪声的规则PAM 4信号生成。通过使用数字神经网络信号恢复，整形后的QPSK信号的误码率和广义互信息都有1dB的增益改善。
英文摘要：
An optical gateway to convert four-level pulse amplitude modulation to quadrature phase shift keying modulation format having shaping gain was proposed for flexible intensity to phase mapping which exploits non-uniform phase noise. The power consumption of the optical modulation format conversion can save by making a DNN-based decision on the receiver side for the generated QPSK signal with non-uniform phase noise. A proof-of-principle experiment has shown that an optically geometric constellation shaped QPSK modulated signals generated from regular PAM4 signals with Gaussian-distributed noise. The shaped QPSK signal shows BER and generalized mutual information improvement by 1dB gain through the use of digital neural network signal recovery.
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