Performance comparison of high-speed long-reach mode division multiplexing-based radio over free space optics transmission system using different modulation formats under the effect of atmospheric turbulence

摘要

We report the performance comparison of mode division multiplexing (MDM)-based radio over free space optics (RoFSO) transmission system using different modulation formats viz. alternate mark inversion, nonreturn to zero (NRZ), return to zero-differential phase shift keying (RZ-DPSK), and NRZ-DPSK under varying atmospheric turbulence conditions and data transmission rates. The results show that the NRZ-DPSK modulation format performs considerably better as compared to other modulation formats. Furthermore, the enhanced performance of the proposed NRZ-DPSK modulation-based MDM-RoFSO transmission system is investigated under different weather conditions and the results are compared with previously reported works. radio over free space optics; mode division multiplexing; atmospheric turbulence; modulation format; data transmission rate.