Han Mengyao, Wang Muguang, Fan Yuchuan, Cai Shiyi, Guo Yuxiao, Zhang Naihan, Schatz Richard, Popov Sergei, Ozolins Oskars, Pang Xiaodan
Opt Express. 2022 Dec 19;30(26):47515-47527. doi: 10.1364/OE.474207.
An approach for simultaneous modulation format identification (MFI) and optical signal-to-noise ratio (OSNR) monitoring in digital coherent optical communications is proposed based on optoelectronic reservoir computing (RC) and the signal's amplitude histograms (AHs) obtained after the adaptive post-equalization. The optoelectronic RC is implemented using a Mach-Zehnder modulator and optoelectronic delay feedback loop. We investigate the performance of the proposed model with the number of symbols, bins of AHs and the hyperparameters of optoelectronic RC. The results show that 100% MFI accuracy can be achieved simultaneously with accurate OSNR estimation for different modulation formats under study. The lowest achievable OSNR estimation mean absolute errors for the dual-polarization (DP)-quadrature phase-shift keying signal, the DP-16-ary quadrature amplitude modulation (16QAM) signal, and the DP-64QAM signal are 0.2 dB, 0.32 dB and 0.53 dB, respectively. The robustness of the proposed scheme is also evaluated when the optoelectronic RC is in presence of additive white Gaussian noises. Then, a proof of concept experiment is demonstrated to further verify our proposed method. The proposed approach offers a potential solution for next-generation intelligent optical performance monitoring in the physical layer.
基于光电储层计算（RC）和自适应后均衡后获得的信号幅度直方图（AHs），提出了一种在数字相干光通信中同时进行调制格式识别（MFI）和光信噪比（OSNR）监测的方法。光电RC使用马赫-曾德尔调制器和光电延迟反馈回路实现。我们研究了所提模型在符号数量、AHs的箱数以及光电RC的超参数方面的性能。结果表明，对于所研究的不同调制格式，在准确估计OSNR的同时可实现100%的MFI准确率。对于双偏振（DP）-正交相移键控信号、DP-16进制正交幅度调制（16QAM）信号和DP-64QAM信号，可实现的最低OSNR估计平均绝对误差分别为0.2 dB、0.32 dB和0.53 dB。当光电RC存在加性高斯白噪声时，还评估了所提方案的鲁棒性。然后，进行了概念验证实验以进一步验证我们所提的方法。所提方法为下一代物理层智能光性能监测提供了一种潜在的解决方案。
