Long-term intensity modulated optical communication over a 1.3km free-space atmospheric link using optimized PAT system and AM noise suppression

Over the past few years, the growing need for fast and high-capacity data transmission between satellites and ground stations has increased significantly, driven by the rising requirements for global connectivity, remote sensing applications, and real-time data processing. Free-Space Optical (FSO) communication harnesses optical signals to deliver superior data rates, improved security, and reduced spectral congestion. However, atmospheric disruptions, such as beam wander and optical power variations, introduce noise and signal instability, significantly impacting FSO system performance. To address these issues, we developed a 1.3 km FSO communication system integrating Pointing, Acquisition, and Tracking (PAT) technology and a Semiconductor Optical Amplifier (SOA)-based Amplitude (AM) noise compensation system. Eye diagram analysis revealed significant improvements in signal clarity and stability after AM noise compensation. This study demonstrates the effectiveness of PAT systems and SOA-based AM noise compensation in improving FSO communication performance. These advancements highlight the potential of FSO technology as a reliable solution for high-performance satellite-to-ground communication links, enabling faster and more reliable data transmission in future space missions.