Spectrally Efficient High-Speed MDM-FSO Using Higher-Order Modes

Mode division multiplexing is a technique for realizing spectrally efficient communication in upcoming wireless networks. This article proposes a system combining mode division multiplexing (MDM) and free space optics (FSO) to achieve a data rate of 40 Gbps using higher order modes through each channel with Laguerre Gaussian mode (LG mode) or Hermite Gaussian mode (HG mode), each having 8 modes, respectively. Performance analysis is investigated by considering the variations in atmospheric conditions as well as in transmission range. Bit error rate, eye diagram, and Q factor are the parameters used for system evaluation. The results after the simulation report an overall data transmission of 320 Gbps.