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Experimental technology created by University of Cambridge researchers uses laser beams to transmit data at extremely high speed, reduces typical interferences of traditional Wi-Fi, and promises lower energy consumption in environments that require more stable and faster connections.
A team linked to the University of Cambridge presented an experimental wireless optical communication system capable of transmitting data via laser beams indoors, reaching the mark of 362.7 gigabits per second in tests conducted over a mere two-meter link.
Described in 2026 in the scientific journal Advanced Photonics Nexus, the technology is not intended to immediately replace traditional Wi-Fi, but rather to act as a complementary alternative in locations that require faster, more stable connections with lower energy consumption.
During the tests, the researchers used an array of VCSEL lasers, an acronym for Vertical-Cavity Surface-Emitting Laser, a technology that allowed 21 of the 25 emitters available on the chip to operate simultaneously, with individual rates between 13 and 19 gigabits per second.
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With all channels active simultaneously, the system reached 362.7 Gbps, a performance far superior to what is currently found in conventional home networks and sufficient to move large volumes of data in a few seconds, provided that the entire infrastructure matches the same capacity.
Although comparisons with instant 4K movie downloads help illustrate the technology’s potential, the size of these files varies according to compression, duration, and image quality, which prevents absolute estimates for real-world home use scenarios.
How light-based internet with lasers works
Unlike conventional Wi-Fi, which relies on radio waves to transmit information, wireless optical communication uses modulated light to carry digital data between transmitters and receivers positioned in the same environment.
In the model tested by the researchers, directed beams create a kind of exclusive transmission corridor in the air, significantly reducing the risk of electromagnetic interference caused by signal contention among routers, cell phones, Bluetooth devices, and smart appliances.
This point is important in increasingly congested enclosed environments.
Apartments, offices, hospitals, airports, and data centers concentrate many connected devices, which increases signal contention and can reduce connection stability.
Still, optical technology has its own limitations.
Light beams depend on alignment, planned coverage, and compatible receivers, in addition to being more easily subject to physical blockages than radio waves in certain situations.
VCSEL technology promises more speed and lower consumption
The tested system uses VCSEL lasers, components already known in sensor applications, optical communication, and electronic devices.
They emit light perpendicularly to the chip’s surface, which facilitates integration into compact and scalable arrays.
In the case of the study, the array concentrated several transmission channels into a single arrangement.
Each laser carried an independent data stream, allowing the array to achieve a much higher aggregate rate than that of a single emitter.
In addition to speed, energy consumption drew attention.
The system operated with approximately 1.4 nanojoules per transmitted bit, a value presented as about half the per-bit expenditure associated with Wi-Fi 6 in a direct comparison made by the researchers.
This efficiency can have a significant impact on corporate networks and data infrastructure.
In environments with intense traffic and continuous operation, small reductions in per-bit consumption can represent significant savings over time.
Why Wi-Fi will still be present
Even with the impressive results obtained in the laboratory, laser communication still remains in an experimental phase and far from completely replacing the Wi‑Fi currently used in homes and offices.
While Wi‑Fi remains more efficient for covering large areas and connecting devices distributed across different environments, researchers believe that optical technology can take on specific tasks that require higher speeds and less signal interference.
Optical networks could take on specific tasks, such as heavy file transfers, ultra-high-resolution video conferences, virtual reality applications, telemedicine, and industrial environments sensitive to interference.
Hospitals appear among the possible first beneficiaries, because they depend on stability and may have equipment that suffers from electromagnetic noise.
Engineering offices, laboratories, airports, and data centers are also among the most likely scenarios for initial adoption.
To reach homes, the technology still needs to overcome important stages.
Components need to become smaller, cheaper, and easier to install, in addition to operating safely, with useful range, and simple integration with existing networks.
What’s missing for laser internet to reach homes
The rate of 362.7 Gbps was recorded under controlled laboratory conditions, using specific equipment and a reduced distance between transmitter and receiver, a scenario very different from the reality found in homes, offices, and public spaces.
Despite demonstrating technical feasibility, the experiment still depends on important advances in standardization, component miniaturization, and cost reduction for the technology to become an accessible product for the end consumer.
For a wireless technology to spread, manufacturers need to adopt common protocols, create compatible receivers, and ensure stable operation in real-world scenarios, with people moving and obstacles in the environment.
It will also be necessary to define where optical communication offers a clear advantage over Wi‑Fi, private 5G, or traditional cabling.
In many cases, the best solution may be hybrid, combining radio, fiber optics, Ethernet, and light links as needed.
Even with these barriers, the advance reinforces an important change in internal connectivity.
The future of wireless networks tends to depend less on a single technology and more on the combination of different transmission media, each used where it delivers the best performance.
Laser internet, therefore, does not announce the immediate end of Wi‑Fi, but shows a way to relieve congested networks and expand transmission capacity in enclosed environments.
The speed jump recorded in the laboratory indicates that the next phase of connectivity may involve light beams, not just antennas.
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