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The data highway is a metaphor for the bidirectional laser link tested by the Chinese Academy of Sciences with the DRO-A satellite. After more than a year in orbit, the system achieved 1.25 Mbps in uplink and 100 Mbps in downlink over a distance exceeding 400,000 kilometers.
China has completed an experimental demonstration that could shape how large volumes of information will be transported between Earth and future lunar operations. The so-called data highway, a term used here as a metaphor for the connection, technically consists of a bidirectional laser communication link exceeding 400,000 kilometers, established between ground equipment and the DRO-A satellite.
The results were announced on August 27, 2026 by the Chinese Academy of Sciences (CAS), echoing a report from China Science Daily. After more than a year of tests in orbit, researchers confirmed for the first time in China the capability for high-speed laser communication in the Earth-Moon space, achieving 1.25 Mbps in communication from Earth to the satellite, and 100 Mbps on the return journey.
Experiment Takes Chinese Laser Communication from Low Orbit to Earth-Moon Space
The project is part of a strategic program by the Chinese Academy of Sciences dedicated to exploring the distant retrograde orbit in the Earth-Moon system. The laser communication experimental payload onboard the DRO-A was developed under the leadership of CAS’s Center for Engineering and Technology for Space Applications in collaboration with Zhejiang Lab.
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On Earth, the necessary infrastructure to establish the connection also involved the Yunnan Astronomical Observatory and the Shanghai Institute of Microsystems and Information Technology, both part of the Chinese Academy of Sciences. The objective was not just to send a signal but to maintain high-speed bidirectional communication over a distance greater than 400,000 kilometers.
According to the CAS, the results represent a scale change for the Chinese program: optical space communication technology has moved from applications near low Earth orbit and been demonstrated within the Earth-Moon environment.
Data Highway Utilizes Laser Instead of Traditional Microwaves
The data highway operates differently from conventional systems based on microwaves. Instead of predominantly transporting information via radio frequency, the technology employs laser beams to send data between space and ground terminals.
According to the Chinese Academy of Sciences, optical communication offers potential advantages in speed, bandwidth, directional precision, security, and reduction in size and mass of the equipment. The system also enables high-speed transmission and reception in both directions.
This is particularly relevant for missions that must produce increasing volumes of scientific data. High-resolution images, measurements made by instruments, telemetry, and other information must travel hundreds of thousands of kilometers before reaching teams on the ground.
Distance Exceeding 400,000 Kilometers Makes Targeting the Laser a Challenge
One of the central issues was the precision required to keep two terminals aligned at extreme distances. Unlike a fixed terrestrial connection, satellites, planets, atmospheres, and equipment are subject to movements and variations that need to be continuously considered.
Yang Lei, a researcher at the Space Applications Center and leader of the experimental team, pointed out three major challenges faced by the sector: pointing accuracy, strong signal attenuation, and difficulty in increasing transmission speeds. According to him, five years of technical development were necessary to address these limitations.
To solve the first problem, the team created a method for bidirectional acquisition and tracking suitable for ultra-long distances and extremely weak signals. The system considers elements such as satellite orbit, mounting errors, telescope deformations, atmospheric refraction, and even the time required for the laser to cover the distance.
System needs to reach a predicted area even before the target arrives
At lunar distances, small pointing deviations can prevent the beam from correctly reaching the receiver. Therefore, calculations must determine in advance where the target will be when the signal actually arrives.
The Chinese solution allows the space and ground terminals to maintain high-precision alignment while in motion, according to the description presented by the CAS. This way, the beam can illuminate the previously calculated region at the appropriate moment.
This level of precision is an essential part of the data highway, because increasing transmission speeds would not help if the optical link could not remain stable long enough to transfer large files.
Individual photons help find information amid the noise
The second difficulty lay in the signal intensity. After traveling hundreds of thousands of kilometers, the received energy can be extremely small, while interference and noise remain present in the system.
To increase detection capacity, researchers developed solutions based on superconducting detection of individual photons at high speed, as well as signal processing algorithms with high sensitivity.
In practice, the system needs to separate what truly belongs to the communication beam from a large amount of background noise. Detecting extremely weak signals is as important as producing the laser, because the information must remain recognizable after the long journey through space.
China achieved 100 Mbps from satellite to Earth
The third barrier was increasing the transfer rate. The team worked with high-bandwidth communication processing and temporal recognition on a picosecond scale, according to the Chinese Academy of Sciences.
They employed high-order pulse position modulation, signal processing for very low signal-to-noise ratio conditions, and error correction mechanisms. The goal is to transport large volumes of data without turning the speed increase into an unacceptable growth in the error rate.
In tests, the experimental data highway achieved 1.25 Mbps on the uplink, that is, in the communication directed from Earth to the space equipment, and 100 Mbps on the downlink, when information returns from the satellite.
The CAS considers the result an initial baseline. The statement itself claims that the rates achieved establish conditions for future speed improvements.
8K image shows the difference between microwaves and optical communication
The Chinese Academy of Sciences presented a comparison to gauge the impact that higher rates can have on future missions. According to the institution, traditional microwave systems suffer from bandwidth and speed limitations in light of the expected growth in the amount of information produced in a lunar environment.
The only 8K high-resolution image of the Moon’s surface may take between four and five minutes to be transmitted using traditional microwave communication, according to the source.
In the comparison presented by the CAS, a laser connection operating in the range of hundreds of megabits per second (Mbps) could reduce this process to approximately 12 seconds.
This example does not mean that every 8K image will necessarily be transmitted in exactly 12 seconds by the system currently being tested. The time depends, among other factors, on the actual file size and the available bandwidth. The 12 seconds is the comparison provided by the official source to illustrate the potential of faster optical links.
Lunar “data explosion” increases the need for faster connections
Interest in this capability is directly related to plans to expand technological presence around the Moon. More complex scientific missions produce significantly more information than simple telemetry systems.
The CAS anticipates a future “data explosion” in the Earth-Moon space as exploration programs, manned landings, and related lunar research station projects advance.
High-resolution cameras, scientific instruments, navigation systems, and equipment installed at various locations could significantly increase the demand for information transfer.
In this scenario, a data highway based on laser communication could complement traditional technologies by providing more bandwidth to transport large files between the Moon and terrestrial control centers.
Technology also aims to reduce weight and power consumption of space equipment
Speed is not the only aspect considered by researchers. In a space mission, each piece of equipment sent must meet stringent restrictions regarding mass, volume, and energy consumption.
According to Yang Lei, technologies related to optical communication can provide lightweight, compact systems with low energy consumption that can transmit information at high speed.
These features are particularly appealing to lunar projects because reducing mass and consumption may free up resources for other instruments or increase mission flexibility.
The greater the number of bases, vehicles, probes, and equipment operating far from Earth, the greater the need for a communication infrastructure capable of keeping up with this expansion.
Bidirectional communication allows for sending commands and receiving large files
Another important aspect of the experiment is that the link does not operate in only one direction. The team verified communication both from Earth to the satellite and in the reverse path.
The numbers, however, are asymmetrical: 1.25 Mbps uplink and 100 Mbps downlink. This difference is compatible with an experimental architecture where the need to transport large sets of scientific data back to Earth may significantly exceed the volume of commands sent to the equipment.
Bidirectional communication also allows the system to be assessed as a complete infrastructure, rather than just as a point demonstration of optical signal reception.
This combination of long distances, tracking, weak signal detection, and two-way transmission supports the idea of a future data highway between Earth and the Moon.
Network can support crewed missions, lunar stations, and deep exploration
The Chinese Academy of Sciences directly links the technology to future large-scale Chinese operations. Applications cited include manned lunar landings, construction of research stations on the Moon, and deep space exploration.
In this context, the link tested with the DRO-A does not yet represent a commercial network or a permanent lunar infrastructure. This is an experimental technological verification demonstrating the capabilities needed for future systems.
This distinction is important. China has not literally inaugurated a physical “data highway” between the two celestial bodies. Instead, researchers managed to establish and test a high-speed bidirectional laser link over more than 400,000 kilometers.
Experiment Transforms 400,000 Kilometers into a Laboratory for Space Internet
The advancement disclosed on August 27, 2026 combines various challenges into a single test: reaching a target at Earth-Moon distances, identifying extremely weak signals, correcting errors, and returning information at up to 100 megabits per second (Mbps).
The data highway is, for now, experimental, but it indicates the direction of necessary infrastructure for a future where the Moon could produce much more information than current systems need to transport.
If lunar exploration advances toward permanent bases, crewed missions, and increasingly sophisticated scientific instruments, communication may become not just an auxiliary link but a critical part of the space infrastructure itself.
In your opinion, what is most impressive about this technology: keeping a laser aligned over more than 400,000 kilometers, achieving 100 Mbps in data return, or reducing an 8K transmission of several minutes to seconds? Let us know in the comments.
