Laser Leapfrog: Inside China’s Record-Breaking 1 Gbps Geo-Laser Link and the Post-Starlink Future of Space Internet
A Chinese team led by Prof. Wu Jian and Dr. Liu Chao achieved a 1 Gbps downlink from a geostationary satellite using a 2-watt optical laser on June 17, 2025. The experiment, conducted from 36,705 km above Earth to the Lijiang Observatory, used adaptive optics and mode-diversity reception to counter atmospheric turbulence. The downlink speed is five times faster than typical Starlink consumer rates. Latency reached over 500 ms end-to-end.