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<p>Poor vision, high turbulence can seriously impair free-space optical communication, which has grown in popularity as a contemporary wireless communication method. This article’s authors examine how the ‘Single Input Multiple Output’ variety techniques, ‘Aperture Averaging’ strategies, with ‘Wavelength Diversity’ approach affect ‘Free Space Optical communication’ system to mitigate aforementioned issues under a range of turbulence regime strengths and meteorological conditions, including fog, haze, exceptionally clear visibility, clear visibility, and so forth. Two kinds of wavelengths have been taken into consideration while employing the wavelength diversity strategy: short-wave infrared (SWIR) at 1550&#xa0;nm and mid-wave infrared (MWIR) at 4000&#xa0;nm. The total performance at a 4&#xa0;km link distance has been evaluated using up to 12 receiver-side detectors, and aperture averaging has been done using a receiver aperture diameter of 0.05 to 0.2&#xa0;m. The simulation tool utilised to assess the overall performance was MATLAB. The efficiency of the system has been enhanced by expanding the diameter of the lens aperture at the receiver side and the photodiode array. When there is fog and lower turbulence conditions, the BER values for the MWIR SIMO (Twelve detectors) and aperture averaging (two hundred millimeter) schemes at 70 dB SNR are around 3 × 10<sup>− 5</sup> and 2.1 × 10<sup>− 1</sup>, whereas the SWIR connection fails under the same conditions.</p>

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Performance assessment and comparison of the MWIR & SWIR FSO transmission link under turbulence and variable visibility situations utilizing several spatial diversity techniques

  • 期刊论文

  • 发表日期：

    2026年6月19日

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  • Shibabrata Mukherjee,
  • Priyanka Ghosh,
  • Parthasarathi Satvaya

摘要

Poor vision, high turbulence can seriously impair free-space optical communication, which has grown in popularity as a contemporary wireless communication method. This article’s authors examine how the ‘Single Input Multiple Output’ variety techniques, ‘Aperture Averaging’ strategies, with ‘Wavelength Diversity’ approach affect ‘Free Space Optical communication’ system to mitigate aforementioned issues under a range of turbulence regime strengths and meteorological conditions, including fog, haze, exceptionally clear visibility, clear visibility, and so forth. Two kinds of wavelengths have been taken into consideration while employing the wavelength diversity strategy: short-wave infrared (SWIR) at 1550 nm and mid-wave infrared (MWIR) at 4000 nm. The total performance at a 4 km link distance has been evaluated using up to 12 receiver-side detectors, and aperture averaging has been done using a receiver aperture diameter of 0.05 to 0.2 m. The simulation tool utilised to assess the overall performance was MATLAB. The efficiency of the system has been enhanced by expanding the diameter of the lens aperture at the receiver side and the photodiode array. When there is fog and lower turbulence conditions, the BER values for the MWIR SIMO (Twelve detectors) and aperture averaging (two hundred millimeter) schemes at 70 dB SNR are around 3 × 10− 5 and 2.1 × 10− 1, whereas the SWIR connection fails under the same conditions.