Next-Generation Free-Space Optical Communication: Systems, Networks, and Signal Processing

Dear Colleagues,

Free-space optical (FSO) communication has emerged as a transformative solution bridging the gap between high-capacity fiber systems and flexible wireless networks. Leveraging the vast unlicensed optical spectrum, FSO enables ultra-high-speed, low-latency, and secure data transmission across diverse environments—from terrestrial and aerial links to underwater and inter-satellite connections. Recent advances in micro/nano-photonics, adaptive optics, and intelligent signal processing have accelerated the evolution of next-generation FSO systems, addressing long-standing challenges such as turbulence-induced fading, misalignment, and dynamic link variability.

This Special Issue, “Next-Generation Free-Space Optical Communication: Systems, Networks, and Signal Processing,” aims to highlight the latest breakthroughs, methodologies, and architectures that redefine the potential of optical wireless communications. We welcome original research articles and comprehensive reviews from academia and industry that explore novel system designs, hybrid FSO–RF networks, intelligent modulation and detection strategies, and advanced photonic integration for robust, scalable, and energy-efficient FSO links.

Topics of Interest

• Advanced FSO system design and link optimization;
• Optical beam shaping, adaptive optics, and turbulence mitigation;
• Hybrid FSO–RF and FSO–fiber integrated networks;
• Intelligent signal processing and AI/ML-assisted modulation and detection;
• Photonic integrated circuits and optoelectronic front-end design;
• Acquisition, tracking, and pointing module for FSO communication system;
• High-speed transceivers for near-Earth and deep-space communication;
• Quantum and secure key distribution in free-space channels;
• Optical networking for UAVs, satellites, and deep-sea nodes;
• Channel modeling and system-level performance evaluation;
• Energy-efficient and self-healing optical wireless networks;

• Underwater wireless optical communication systems and modulation techniques;
• Cross-medium optical communication between air, surface, and underwater platforms.

Dr. Lei Zhu
Dr. Jianxin Ren
Dr. Huan Chang
Guest Editors

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