Sparse Adaptive Frequency Domain Equalizers for Mode-Group Division Multiplexing

  title={Sparse Adaptive Frequency Domain Equalizers for Mode-Group Division Multiplexing},
  author={Kai Shi and Benn C. Thomsen},
  journal={Journal of Lightwave Technology},
In this paper, we develop low complexity sparse frequency domain equalizers (FDEs) that exploit the sparsity that we observe in the graded index multimode fiber multiple-input multiple-output channel. The sparse channel impulse response is caused by the strong crosstalk at the mode MUX/DEMUX and weak coupling in the fiber between different mode groups. Two sparse FDE designs are proposed in order to compensate the crosstalk with relatively low computational complexity. The first method is based… CONTINUE READING


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