Do not worry about internet speed! Laser LiFi transmission can break through 100G per second.

Are you still annoyed by the uneven distribution of Wi-Fi signals and weak signals? Li-Fi may be the answer. The technology is based on LED indoor lighting rather than radio wave data transmission. But Li-Fi's main proponents have outperformed LED, using laser based lighting to achieve Li-Fi and data transmission rate by 10 times. Harald Haas, chair mobile communications member of University of Edinburgh and Ultra-Parallel visible light communication project, said: "the problem is LED lights, although their energy efficiency is higher than that of incandescent lamps, they can also improve their optical output efficiency," says Gerald Haas of University of Edinburgh. "We believe that the next wave of energy-efficient lighting will be based on laser diodes."

Li-Fi encodes data by adjusting the output of LED light. Human eyes can not detect fast flickers, but receivers or mobile devices on desktop computers can read signals, or even return signals to the ceiling of the room to provide two-way communication. But many light-emitting diodes use phosphor coating to turn blue light into white light, which limits the speed of data transmission.

The research is published in Optics Express. Haas and his team have shown that replacing existing LED lamps with laser diodes can greatly improve the situation. The laser has high energy and light efficiency, and the data transmission rate can be 10 times faster than that of LED. Without using phosphor, laser illumination can mix different wavelengths of light to produce white light. This means that each wavelength of light can be used as a separate data channel. The same light wave can be transmitted in two directions, which greatly improves the speed of optical data transmission. The team of University of Edinburgh used 9 laser diodes.

Although LED based Li-Fi can achieve 10 Gb/s data transmission rate, the upper limit of data transmission rate of Wi-fi7 Gb/s can be improved. The rate of laser data transmission can easily exceed 100 Gb/s.

At present, the equipment is still very expensive. University of Edinburgh is seeking mass production to reduce its cost and apply it to the lighting market. The headlight of BMW I8 is based on the laser light.

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