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Sunny instead of Wi-Fi

04.11.2022

A team of scientists from Saudi Arabia has developed a solution that can use sunlight instead of traditional Wi-Fi.

The smart glass system, being developed by scientists at the King Abdullah University of Science and Technology (KAUST), can modulate sunlight passing through it, encoding data into light waves that can be received and decoded by devices placed in the room.

Using sunlight to transmit data allows you to create a more environmentally friendly type of connection when compared to conventional Wi-Fi or cellular communications. The system can be installed in glass windows of large buildings, such as offices.

The solar-based communication system developed by KAUST specialists consists of two parts. A light modulator that can be built into the glass surface and a receiver placed in the room.

An array made up of liquid crystal blinds can function as a filter to encode signals into light as it passes through it. While traditional Wi-Fi routers use 5 to 20 watts of electricity, DLS arrays only need to operate the 1 watt of electricity that a small solar panel can provide. The DLS design allows you to change another property of light - polarization.

It is clear that such a system can only work at a time when the sun is shining. Therefore, this technology can be used to save energy during the daylight hours. And as soon as the sun goes down - turn on Wi-Fi.

In all previous optical wireless communication systems, data encoding was usually done by varying the light intensity. But if the frequency of these intensity changes is too low, it can be noticeable to the human eye and cause an unpleasant flickering effect.

The proposed system is capable of transmitting data at a rate of 16 kilobits per second.

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