In this paper, we present a mode demultiplexing algorithm based on robust independent component analysis (ICA) in electrical domain. Multi-mode fiber (MMF) based spatial division multiplexing system is modeled as a behavioral model. Different modes can carry the data to increase the system capacity with the proposed algorithm. In the system, two orthogonal frequency division multiplexing (OFDM) signals are modulated on two modes by two vertical cavity surface emitting lasers (VCSEL) and then coupled into the MMF with an optical coupler. Two channel signals are separated by the proposed robust ICA mode demultiplexing algorithm after photodetectors at the receiver side. The OFDM signals can be demodulated successfully after the separation. Compared with a single mode transmission in MMF, the transmission performance of two mode channels is not degraded significantly with the proposed mode demultiplexing algorithm. Our results show that the proposed algorithm can carry out the modes demultiplexing successfully and the cross-talk between modes can be reduced or be negligible after processing. It also demonstrates a new application of ICA algorithm in the electrical time-domain mode demultiplexing.

在本文中，我们提出了一种基于电域鲁棒独立分量分析（ICA）的模式解复用算法。基于多模光纤 (MMF) 的空分复用系统被建模为行为模型。不同的模式可以携带数据，以通过所提出的算法增加系统容量。在该系统中，两个正交频分复用 (OFDM) 信号通过两个垂直腔面发射激光器 (VCSEL) 调制成两种模式，然后通过光耦合器耦合到 MMF。在接收器侧的光电探测器之后，通过提出的稳健 ICA 模式解复用算法将两个通道信号分开。分离后的OFDM信号可以成功解调。与MMF中的单模传输相比，使用所提出的模式解复用算法，两种模式信道的传输性能没有显着降低。我们的结果表明，所提出的算法可以成功地进行模式解复用，并且经过处理后模式之间的串扰可以减少或可以忽略不计。它还演示了 ICA 算法在电时域模式解复用中的新应用。