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<p>The performance analysis of a dual-polarized (DP)-16 quadrature amplitude modulation (QAM)-based free space optical (FSO) transmission system has been provided in this paper. The system was tested at a data rate of 112 Gbps across four Indian cities—Chandigarh, Jodhpur, Srinagar, and Chennai—with different atmospheric conditions. For various link ranges, the Q Factor, bit error rate (BER), error vector magnitude (EVM), and received optical power (ROP) are used to evaluate the system performance under various beam divergence angles. The findings validate that beam divergence and atmospheric attenuation have a significant impact on system performance. Areas like Chennai permit relatively longer transmission distances than humid, haze-dominated areas like Jodhpur and Srinagar. With link distances varying from 7.75&#xa0;km to 20&#xa0;km based on regional weather characteristics, the proposed DP-16-QAM-based FSO system shows that multi-Gbps transmission is feasible in a variety of Indian atmospheric conditions.</p>

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Performance analysis of 112 Gbps dual-polarized 16-QAM-based free space optical transmission under diverse Indian atmospheric conditions

  • 期刊论文

  • 发表日期：

    2026年6月19日

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  • Gerard Deepak,
  • Maranco Murugaiyan,
  • Mohan Vamsi Musunuru,
  • A. Kaliappan,
  • R. Jeyarani,
  • Amsaveni Manigandan

摘要

The performance analysis of a dual-polarized (DP)-16 quadrature amplitude modulation (QAM)-based free space optical (FSO) transmission system has been provided in this paper. The system was tested at a data rate of 112 Gbps across four Indian cities—Chandigarh, Jodhpur, Srinagar, and Chennai—with different atmospheric conditions. For various link ranges, the Q Factor, bit error rate (BER), error vector magnitude (EVM), and received optical power (ROP) are used to evaluate the system performance under various beam divergence angles. The findings validate that beam divergence and atmospheric attenuation have a significant impact on system performance. Areas like Chennai permit relatively longer transmission distances than humid, haze-dominated areas like Jodhpur and Srinagar. With link distances varying from 7.75 km to 20 km based on regional weather characteristics, the proposed DP-16-QAM-based FSO system shows that multi-Gbps transmission is feasible in a variety of Indian atmospheric conditions.