In this work, we propose to use various artificial neural network (ANN) structures for modeling and compensation of intra- and inter-subcarrier fiber nonlinear interference in digital subcarrier multiplexing (DSCM) optical transmission systems. We perform nonlinear channel equalization by employing different ANN cores including convolutional neural networks (CNN) and long short-term memory (LSTM) layers. We start to compensate the fiber nonlinearity distortion in DSCM systems by a fully connected network across all subcarriers. In subsequent steps, and borrowing from fiber nonlinearity analysis, we gradually upgrade the designs towards modular structures with better performance-complexity advantages. Our study shows that putting proper macro structures in design of ANN nonlinear equalizers in DSCM systems can be crucial for practical solutions in future generations of coherent optical transceivers.

本文提出使用各种人工神经网络对数字子载波多路复用光传输系统中的帧内和帧间光纤非线性干扰进行建模和补偿，并通过卷积神经网络和长短期记忆等核心进行非线性信道均衡。本研究表明，在DSCM系统中，将合适的宏结构放入神经网络非线性均衡器的设计中可以对未来一代相干光收发机的实际解决方案起到至关重要的作用。

数字子载波复用系统中用于光通道非线性补偿的神经网络结构