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Indoor wireless connectivity is reaching its physical limits as more devices congest the same frequency band. Streaming, video conferencing, and smart home devices are placing greater demands on networks, while power consumption continues to increase. A new type of laser chip offers an alternative by transmitting data via light.
Researchers have developed a compact optical link capable of providing ultra-fast indoor connections with reduced energy consumption. Instead of broadcasting signals in all directions, it directs data through controlled infrared beams, increasing available capacity and minimizing interference in densely populated environments.
At the heart of this system is a chip featuring 25 tiny lasers, each transmitting its own data stream. Operating simultaneously, these lasers significantly boost data throughput compared to a single source. Experimental tests over a two-meter distance showed individual lasers delivering between 13 and 19 gigabits per second, with the combined system reaching an impressive 362.7 gigabits per second—among the quickest results for chip-scale optical links so far.
The performance improvement isn’t solely about speed; power efficiency also sees a notable boost, providing a more sustainable way to manage growing data needs.
Performance is driven by a 5-by-5 array of vertical-cavity surface-emitting lasers, each functioning as a high-speed communication channel.
Each laser’s beam is shaped into a specific square pattern, which limits overlap and allows multiple links to operate side by side without interference. The system’s receiver hardware restricts the speed limits, suggesting that future enhancements in hardware could push these speeds even higher.
Light offers advantages over radio signals in crowded indoor spaces where interference and bandwidth limitations are common. Instead of scattering signals everywhere, the system creates a grid of precisely targeted beams with minimal spillover, ensuring stable coverage across the area—even when multiple devices are connected simultaneously.
This approach operates at a power level of about 1.4 nanojoules per bit—roughly half the energy used by comparable Wi-Fi setups. However, it is currently optimized for short-range use with a clear line of sight, which limits its distance capabilities.
Looking ahead, this technology aims to work alongside existing wireless networks by handling high-traffic situations indoors. The hardware is fabricated on a tiny chip using standard manufacturing techniques, making integration into existing fixtures or access points feasible, though commercial availability remains in the future.
As network demands continue to grow, combining traditional radio links with laser-based systems could become a standard solution, with light-based technology managing the most data-intensive tasks.
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