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s OAM-PDM-OQPSK FSO system under extensive weather conditions-Performance analysis
  • Naga Subrahmanya Vamsi Mohan Yarra ,
  • Sivanantha Raja A ,
Naga Subrahmanya Vamsi Mohan Yarra
Alagappa Chettiar Government College of Engineering and Technology

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Sivanantha Raja A
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This research paper investigates free space optic (FSO) system by integrating orbital angular momentum (OAM) and polarization division multiplexing (PDM) techniques resulting in the data rate enhancement. Simulation of OAM-PDM-FSO transmission is analyzed by using Optisystem. A successful transmission of 80 Gb/s overall capacity is investigated by means of individual OAM modes (LG0,0, LG0,13, LG0,40, and LG0,80), enhancing the spectral efficiency of the system under different climatic conditions. System performance is studied for various modulation schemes including return-to-zero (RZ), non-return-to zero (NRZ) and offset-quadrature-phase shift keying (OQPSK). The best performance has been shown by means of OQPSK modulation technique. 8x10 Gb/s transmission under the influence of various external weather conditions such as rain, fog and dust is reported. A maximum FSO link range of 6 km is realized under clear weather conditions whereas a minimum FSO range of 1.25 km is achieved under heavy dust conditions. Performance of proposed hybrid OAM-PDM system is evaluated at different link lengths in terms of Q-factor, log (BER), received power and eye diagrams.