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This study presents a performance-optimized Dense Wavelength Division Multiplexing (DWDM) Inter-Satellite Optical Wireless Communication (IsOWC) system utilizing multilevel modulation. To meet the growing bandwidth requirements of inter-satellite data transmission, a 4 × 140 Gbps WDM system incorporating 128-QAM modulation with 100 GHz channel spacing is implemented. To mitigate polarization crosstalk and inter-channel nonlinear effects, a dual-polarization 128-QAM diversity approach is employed. The system is further evaluated under different polarization configurations, with a focus on horizontal and vertical polarizations, to determine the most effective polarization alignment. Simulations are conducted for medium Earth orbit (MEO) distances, and system behavior is assessed using Q-factor, Bit Error Rate (BER), and Error Vector Magnitude (EVM) metrics. Additionally, the dual-polarization 128-QAM scheme is compared against QPSK to identify the most efficient modulation format for extended-range communication. Findings indicate that the proposed polarization-diverse 128-QAM system outperforms traditional QAM-IsOWC and QPSK configurations in terms of reliability and transmission quality.

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Long Reach High Speed MEO Based Inter-Satellite Optical Wireless Incorporating Dual m-QAMs

  • 会议论文

  • 发表日期：

    2026年

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  • Preeti Pannu,
  • Rajendra Prasad Mahapatra,
  • Satjot Singh Dhillon,
  • Shivmanmeet Singh

摘要

This study presents a performance-optimized Dense Wavelength Division Multiplexing (DWDM) Inter-Satellite Optical Wireless Communication (IsOWC) system utilizing multilevel modulation. To meet the growing bandwidth requirements of inter-satellite data transmission, a 4 × 140 Gbps WDM system incorporating 128-QAM modulation with 100 GHz channel spacing is implemented. To mitigate polarization crosstalk and inter-channel nonlinear effects, a dual-polarization 128-QAM diversity approach is employed. The system is further evaluated under different polarization configurations, with a focus on horizontal and vertical polarizations, to determine the most effective polarization alignment. Simulations are conducted for medium Earth orbit (MEO) distances, and system behavior is assessed using Q-factor, Bit Error Rate (BER), and Error Vector Magnitude (EVM) metrics. Additionally, the dual-polarization 128-QAM scheme is compared against QPSK to identify the most efficient modulation format for extended-range communication. Findings indicate that the proposed polarization-diverse 128-QAM system outperforms traditional QAM-IsOWC and QPSK configurations in terms of reliability and transmission quality.