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80 Gb/s OAM-PDM-OQPSK FSO system under extensive weather conditions-performance analysis



  1. Department of Electronics and Communication Engineering, Alagappa Chettiar Government College of Engineering and Technology, Karaikudi, Tamilnadu, India
  2. Department of Electronics and Communication Engineering, University VOC College of Engineering, Thoothukudi, Tamilnadu, India


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 maximum FSO range of 0.125 km is achieved under heavy dust conditions. A satisfactory Bit Error rate (BER) < 10-6 and eye diagrams with wider opening heights for all eight channels achieved. The FSO system also achieves satisfactory BER for various turbulence levels. 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.


OAM, FSO, OQPSK, MDM, Laguerre Gaussian modes.


NAGA SUBRAHMANYA VAMSI MOHAN YARRA, SIVANANTHA RAJA A., ESAKKI MUTHU K., 80 Gb/s OAM-PDM-OQPSK FSO system under extensive weather conditions-performance analysis, Optoelectronics and Advanced Materials - Rapid Communications, 17, 9-10, September-October 2023, pp.446-460 (2023).

Submitted at: May 8, 2023

Accepted at: Oct. 9, 2023