Laser chips promise faster, greener indoor wireless at gigabit speeds

Indoor wireless is hitting limits as more devices crowd the same spectrum. Streaming, video calls, and smart home gear are pushing networks harder while power use rises. A new class of laser chips offers a different path by moving data onto light.

Researchers built a chip-scale optical link that delivers ultra-fast indoor connections with lower energy use. Instead of broadcasting signals widely, it sends data through controlled infrared beams, opening more usable capacity while avoiding interference in dense spaces.

At the core is a chip with 25 microscopic lasers, each carrying its own stream. Working in parallel, they push throughput far beyond a single source. In testing, the setup reached more than 360 gigabits per second across a short indoor link.

The gains are not just speed. Power use drops significantly, offering a more efficient way to handle rising demand.

Laser array proves the speed

Performance comes from a 5 by 5 array of vertical-cavity surface-emitting lasers, each acting as its own high-speed channel.

In tests over two meters, individual lasers delivered about 13 to 19 gigabits per second. With 21 active channels, total throughput reached 362.7 gigabits per second, among the fastest chip-scale optical results so far.

The limit came from the receiver hardware, not the transmitter, suggesting higher speeds are possible with better components.

A custom optical setup also shapes each beam into a defined square, limiting overlap so multiple links can run side by side without interference.

Why light changes the equation

Radio networks struggle in crowded spaces where signals interfere and capacity gets stretched. Light avoids those limits by offering more bandwidth and precise control over where signals go.

Instead of blanketing a room, the system creates a grid of targeted beams with minimal spillover. Measurements show uniform coverage across the target area, helping maintain stable performance for multiple devices.

The setup runs at about 1.4 nanojoules per bit, roughly half that of comparable Wi-Fi systems. The tradeoff is range, as the current setup works over short distances and depends on line of sight.

Where this goes next

This approach is meant to complement existing networks by offloading heavy traffic in high-demand indoor spaces.

The hardware fits on a sub-millimeter chip built with standard processes, making integration into fixtures or access points plausible, though no commercial timeline is given.

As demand rises, combining radio and light-based links could become standard, with laser systems handling the heaviest traffic.