China Achieves First 400,000 km Bidirectional Earth-Moon Laser Link via DRO-A Satellite
On August 26, 2026, the Technology and Engineering Center for Space Utilization (Technology and Engineering Center for Space Utilization) of the Chinese Academy of Sciences announced a landmark achievement: the first successful bidirectional laser communication link established across more than 400,000 km between Earth and the Moon — uplink at 1.25 Mbps, downlink at 100 Mbps. A single 8K high-resolution lunar surface image can now be downlinked in about 12 seconds, compared to 4-5 minutes over a conventional 5 Mbps microwave link. This marks China's transition of space laser communication from low Earth orbit into cislunar space.
The result caps five years of research plus more than a year of in-orbit testing — and it was achieved on a satellite that itself had to be rescued from a failed launch.
Key points
- First bidirectional laser link at lunar distance (>400,000 km): uplink 1.25 Mbps, downlink 100 Mbps; 8K lunar images download in ~12 seconds vs. 4-5 minutes over traditional 5 Mbps microwave links.
- The DRO-A satellite operates in a Distant Retrograde Orbit (DRO) — dynamically stable relative to the Earth-Moon system, requiring low energy for orbital transfer, and considered an ideal staging point for future Earth-Moon transportation.
- Three core challenges ("three mountains") per team leader Yang Lei: 1. Precision: a tiny pointing error at launch becomes kilometers of deviation at the target, with the satellite, Earth, telescope errors, and atmospheric refraction all moving targets. Researcher Li Chao of Zhejiang Lab likened it to "threading a needle" — passing an extremely thin beam through a fast-moving "needle hole" 400,000 km away. 2. Weakness: after 400,000 km, only a few photons reach the ground telescope amid moonlight, starlight, and city light. The team used high-speed superconducting single-photon array detectors with high-sensitivity algorithms. 3. Speed: substantially improved data processing efficiency enabled the 1.25/100 Mbps rates.
- DRO-A's dramatic rescue: in March 2024, the DRO-A/B pair's upper stage malfunctioned, missing its target orbit. Engineers performed repeated perigee maneuvers over a journey of nearly 8.5 million km (the path length far exceeds the Earth-Moon distance due to multiple orbit changes) to recover the satellites. In August 2024 the pair separated and joined DRO-L in low Earth orbit to form the world's first DRO-based Earth-Moon three-satellite constellation.
- Multi-institution collaboration: Technology and Engineering Center for Space Utilization (lead + flight payload), Zhejiang Lab (payload development), Yunnan Observatories (ground optical tracking), Shanghai Institute of Microsystem and Information Technology (single-photon detection).
- International context: NASA's LCRD (GEO, 2021), ESA's EDRS, and NASA's Psyche deep-space laser demo (267 Mbps from ~16 million miles, 2023) are earlier milestones; China's result is distinguished as the first bidirectional link at Earth-Moon distance — a leap in communication scale rather than a raw-speed comparison.
- Roadmap: per Yang Lei, the "information highway" will support more original science data and serve China's crewed lunar landing, lunar research station construction, and deep-space exploration.
- Science and Technology Daily, Aug 26, 2026: https://www.stdaily.com/web/gdxw/2026-08/26/content_570163.html
- China News Service, Aug 26, 2026: https://www.toutiao.com/article/7678322415943893556
- Space and Network, issue 2054: https://www.163.com/dy/article/L59QQ2O005119RIN.html
- DoNews: https://www.donews.com/news/detail/8/6686582.html
Future outlook
Expected milestones over the coming years include routine operation of the Earth-Moon laser link, high-speed downlink support for lunar science payloads, validation as a primary or backup link for crewed lunar missions, and operational data return for the planned lunar research station. Practical consumer impact (faster satellite internet, coverage of remote blind zones, improved GNSS timing) awaits miniaturization and cost reduction of laser terminals.