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<p>The ever-growing demand for high-speed data has challenged the conventional wireless transmission systems. In this paper, we propose a single-channel high-speed bandwidth-efficient free space optics (FSO) transmission by incorporating hybrid Polarization Division Multiplexing (PDM)-Orbital Angular Momentum (OAM) Multiplexing-Orthogonal Frequency Division Multiplexing (OFDM) using 16-level Quadrature Amplitude Modulation (QAM) signals. 2-OAM beams (<InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\:{LG}_{\text{0,0}}\)</EquationSource> </InlineEquation> and <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(\:{LG}_{\text{0,15}})\:\)</EquationSource> </InlineEquation>of 2-orthogonal polarized beams are used to carry 640 Gbps of data over a free space channel by incorporating in-phase-quadrature modulation. At the receiver terminal, signal processing is implemented to rectify the signal distortion due to the free space channel losses. We analyzed the proposed system performance for varying weather conditions using standard performance metrics including constellation, Error Vector Magnitude (EVM), and Bit Error Rate (BER) over an increasing transmission range. The obtained results demonstrate reliable 640 Gbps transmission using the proposed system with a range varying from 703&#xa0;m to 7&#xa0;km within forward error correction (FEC) limits of BER ≤ 3.8<InlineEquation ID="IEq3"> <EquationSource Format="TEX">\(\:\times\:{10}^{-3}\)</EquationSource> </InlineEquation>, EVM ≤ 17.5%, and clear constellation.</p>

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Performance evaluation of a 640 Gbps integrated polarization division multiplexing-orbital angular momentum multiplexing-orthogonal frequency division multiplexing based free space optics transmission

  • 期刊论文

  • 发表日期：

    2026年2月2日

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  • Amit Grover,
  • Vivek Soi,
  • Tanvir Kaur,
  • Vinay Kumar Singh,
  • Mehtab Singh,
  • Somia A. Abd El-Mottaleb,
  • Moustafa H. Aly

摘要

The ever-growing demand for high-speed data has challenged the conventional wireless transmission systems. In this paper, we propose a single-channel high-speed bandwidth-efficient free space optics (FSO) transmission by incorporating hybrid Polarization Division Multiplexing (PDM)-Orbital Angular Momentum (OAM) Multiplexing-Orthogonal Frequency Division Multiplexing (OFDM) using 16-level Quadrature Amplitude Modulation (QAM) signals. 2-OAM beams ( \(\:{LG}_{\text{0,0}}\) and \(\:{LG}_{\text{0,15}})\:\) of 2-orthogonal polarized beams are used to carry 640 Gbps of data over a free space channel by incorporating in-phase-quadrature modulation. At the receiver terminal, signal processing is implemented to rectify the signal distortion due to the free space channel losses. We analyzed the proposed system performance for varying weather conditions using standard performance metrics including constellation, Error Vector Magnitude (EVM), and Bit Error Rate (BER) over an increasing transmission range. The obtained results demonstrate reliable 640 Gbps transmission using the proposed system with a range varying from 703 m to 7 km within forward error correction (FEC) limits of BER ≤ 3.8 \(\:\times\:{10}^{-3}\) , EVM ≤ 17.5%, and clear constellation.