China successfully tests high-speed laser link between Earth and the Moon
Chinese researchers have successfully established a two-way high-speed laser communication link between Earth and the Moon, spanning more than 400,000 kilometers. Announced by the Technology and Engineering Center for Space Utilization of the Chinese Academy of Sciences, the milestone follows more than a year of in-orbit testing and represents a significant extension of China's laser communications capabilities beyond near-Earth orbit into deep space. Compared with traditional microwave systems, laser communications deliver faster speeds, greater bandwidth, stronger security, and more compact hardware, advantages that become increasingly critical as lunar ambitions grow more complex.
To recover a signal so faint that ground telescopes catch only a handful of photons at a time, drowned out by moonlight, starlight, and urban light pollution, the researchers developed superconducting single-photon detection hardware and high-sensitivity algorithms. Special coding schemes and high-bandwidth signal processing pushed the link to verified rates of 1.25 Mbps uplink and 100 Mbps downlink. With China planning manned lunar landings and a permanent lunar research station, the volumes of imagery and scientific data that future missions will generate would quickly overwhelm conventional radio links, making this laser highway a foundational piece of infrastructure for the next era of lunar exploration.