New wireless system based on laser, offers transmission speed exceeding 360 Gbps
The technological medium scitechdaily published that researchers in University of Cambridge, developed a new laser-based wireless system, with transmission speed exceeding 360 Gbps and energy consumption only half that of Wi-Fi technology.
The researchers point out that modern life relies on fast and reliable wireless connections, but traditional radio spectrum is becoming increasingly congested and energy consumption continues to rise. Therefore, they decided to develop a new optical wireless communication system which uses light to transmit data instead of radio waves.
Light has much greater available bandwidth, does not interfere with existing wireless systems, and can be precisely directed, making it particularly suitable for indoor usage scenarios such as homes, offices, and data centers.
At the heart of the system is a chip size less than 1 square millimeter, which incorporates a 5×5 VCSEL array. This infrared laser is highly efficient and supports high-speed operation. Each laser can be controlled independently and transmits an independent data stream. With the parallel operation of multiple lasers, the system significantly increases the total data capacity it can manage.
The tests showed that among the 21 activated lasers, the speed of a single laser reached 13 to 19 Gbps and the overall system speed reached 362,7 Gbps.
To address the problem of multi-beam interference, the team designed a compact optical system that calibrates light through an array of microlenses and uses additional lenses to distribute the beams into a structured grid, ensuring minimal overlap in the coverage area.
Tests showed that the lighting uniformity exceeded 90% at a distance of 2 metersIn multi-user tests, simultaneous operation of four beams achieved a stable transmission speed of approximately 22 Gbps.
In terms of energy efficiency, the system consumes approximately 1,4 nanojoules per bit of transmission, which is about half that of similar Wi-Fi technologies. The researchers emphasize that this technology does not replace Wi-Fi, but acts as a complement to decongest the radio network. In the future, this system could be integrated into lighting equipment to build next-generation high-performance indoor networks.
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