Anggun Fitrian Isnawati, Fauza Khair, I. Wayan Mustika, Sevia M. Idrus, Fakhriy Hario, Fauzi Khair
This study investigates the performance of a 200 Gbps Inter-satellite Optical Wireless Communication (Is-OWC) system operating across LEO, MEO, and GEO orbital distances. The analysis evaluates multiple digital modulation schemes (QPSK, 8-PSK, 16-PSK, and 16-QAM) under varying transmit power levels (20, 25, and 30 dBm) and long-range propagation conditions (1000-5000 km). The system model incorporates external optical modulation, coherent detection, and free-space optical channel impairments including pointing errors, beam divergence, and path loss. Comparative results between theoretical and simulated optical received power show excellent agreement, validating the accuracy of the link model. Performance metrics including optical received power, bit error rate (BER), symbol error rate (SER), and error vector magnitude (EVM) reveal that QPSK consistently delivers the most reliable transmission across all distances and power levels due to its strong noise resilience and simple constellation structure. Higher-order modulation formats exhibit increased sensitivity to attenuation and phase noise, although 16-QAM shows significant improvement at higher power levels, making it a viable option for high-capacity links when sufficient transmit power is available. Overall, the findings demonstrate that QPSK is optimal for long-distance, power-constrained IsOWC links, while 16-QAM provides an effective trade-off between spectral efficiency and performance in high-power scenarios, supporting the development of next-generation ultra-gigabit inter-satellite optical communication networks. © 2025 IEEE.
Department of Telecommunication Engineering, Telkom University, Purwokerto, Indonesia; Department of Electrical Engineering and Information Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia; Faculty of Electrical Engineering, Universiti Teknologi Malaysia Johor Bahru, Johor, Malaysia; Department of Electrical Engineering, Universitas Brawijaya, Malang, Indonesia; Industrial Engineering Department, Bina Nusantara University, Jakarta, Indonesia
