Revolutionizing Wireless: Light-Based System Achieves 362 Gbps Using Minimal Power

A groundbreaking wireless technology employing miniature lasers instead of traditional radio waves has achieved a combined data transfer speed of 362.7 gigabits per second in recent laboratory experiments, as detailed in a March 2026 publication. This chip-scale optical platform, featured in the journal Advanced Photonics Nexus, also demonstrated roughly half the energy consumption per bit compared to current high-end Wi-Fi technologies in equivalent testing environments.

This impressive performance was accomplished by simultaneously operating 21 compact lasers across a two-meter free-space optical link. Each individual laser stream carried data rates ranging from 13 to 19 gigabits per second. According to a report from SPIE, the global optics and photonics society, this cumulative transmission speed ranks among the fastest documented for a chip-scale optical wireless transmitter paired with a free-space receiver.

Unlike Wi-Fi and cellular networks that depend on increasingly congested radio spectrums, often challenged by interference and growing energy demands, optical wireless communication uses light signals to circumvent these issues. This approach unlocks vastly larger bandwidths and significantly reduces signal interference within densely populated indoor environments.

Add Cosmo Herald as a Preferred Source

Miniature Chip Integrates 25 Advanced Lasers

Central to the system is a 5 by 5 matrix of vertical-cavity surface-emitting lasers, or VCSELs. These infrared semiconductor lasers are known for their fast operation and energy efficiency, already employed in data centers and sensor devices, and are fabricated in large arrays using mature manufacturing processes.

The team from the University of Cambridge constructed the array leveraging industry-standard techniques and securely mounted the tiny chip onto a custom circuit board. As explained in their publication in Advanced Photonics Nexus, the entire laser arrangement fits within a chip smaller than one millimeter across. Each laser functions independently, allowing the system to transmit multiple data streams concurrently from a single chip.

A compact chip-scale device combines a 5×5 VCSEL array and precision beam-shaping optics to form a structured light grid. These lasers are inherently power-efficient and capable of direct high-speed operation, reducing the energy needed per data bit far below typical Wi-Fi systems. Image courtesy of H. Safi (University of Cambridge).

Preliminary experiments revealed stable laser output and consistent high-frequency modulation performance across the array. Out of the 25 lasers integrated on the chip, 21 were actively used during the velocity benchmarks.

Optimizing Light Paths to Prevent Signal Crosstalk

Simultaneously activating many light beams introduces the challenge of beam overlap, which can cause signal interference and complicate data separation at the receiver. The research group addressed this by creating a compact optical setup that precisely shapes and directs light emitted from the array.

An innovative microlens array aligns each laser beam into parallel paths, followed by additional lenses that organize the beams into a neatly structured grid of square illumination spots on the receiver surface. This arrangement ensures minimal overlap, with measurements confirming over 90 percent uniformity across the illuminated two-meter distance.

Precision-engineered lenses form the laser emissions into a defined grid of light squares, enabling multiple simultaneous connections in the same indoor environment without signal interference. Image credit: Shutterstock

This carefully arranged light pattern supports multiple users simultaneously. In tests involving four simultaneous beams, each maintained connection stability while delivering a combined transfer speed of approximately 22 gigabits per second, as documented by ScienceDaily. These findings demonstrate the capability for multiple concurrent optical wireless links within a single room without significant interference.

Comparative Energy Efficiency with Traditional Wi-Fi Systems

The optical transmitter consumed about 1.4 nanojoules per bit, nearly half the energy per bit reported for cutting-edge Wi-Fi technologies under similar testing conditions.

While radio-wave-based methods require more power to scale up data rates, the optical solution benefits from inherently energy-efficient laser components that can be driven at high speeds directly, eliminating the need for complicated power control mechanisms. The lasers utilized a modulation scheme dividing data into multiple tightly spaced frequency channels, maximizing the use of available bandwidth and adapting dynamically to signal quality variations.

Complementing Existing Wireless Networks for Enhanced Indoor Capacity

The researchers emphasized that optical wireless communication is designed to augment rather than replace current Wi-Fi and cellular networks. Optical links can handle heavy data loads indoors where radio spectrum capacity is limited, alleviating congestion on traditional networks.

The study highlights that the top speeds achieved were constrained by the commercial photodetector bandwidth employed in the tests. Integrating faster detectors with the existing transmitter architecture could further elevate data transmission rates. The laser chip was fabricated using mature semiconductor manufacturing techniques and assembled on a bespoke circuit board for these evaluations.