 |
British researchers said that they have achieved data transmission speeds of up to 10 Gb/s using Li-Fi technology, a technology for data transmission via LED bulbs.
The researchers used a miniature LED light bulb that achieved a 3.5 Gb/s data transmission speed by composing three primary colors of white light—red, green, and blue—in one of the primary colors. This means that it is possible to achieve data transfer speeds in excess of 10 Gb/s. Li-Fi is an emerging technology that allows tailor-made LED bulbs to provide low-cost wireless network connectivity almost anywhere.
High speed
The research project is named “Super Parallel Visible Light Communication Engineering†and is a joint project conducted by the University of Edinburgh, St. Andrews University, Strathclyde University, Oxford University and Cambridge University. Funding.
Miniature LED light bulbs, developed by the University of Strathclyde, allow light to be emitted in parallel, increasing the amount of data transmitted at any time. “Imagine showering nozzles that divide water into parallel streams of water. This is what we do with light,†said Harald Haas, professor of fiber wireless communications at Edinburgh University and one of the project leaders.
Using a digital modulation technique called "Orthogonal Frequency Division Multiplexing", researchers can make the brightness of micro LED bulbs change millions of times per second, which is like an extremely fast switch. This allows a large amount of binary data - that is, a series of data consisting of 0 and 1 - to propagate at high speed.
Earlier this year, the German Fraunhofer Heinrich Hertz Institute stated that under laboratory conditions, data transmission speeds of up to 1 Gb/s are possible. This month, Chinese scientists have developed a microchip LED light bulb that can achieve 150 Mb/s data transmission speed. One such bulb can provide four computers with an internet connection.
Li-Fi technology
In 2011, Professor Haas demonstrated how LED light bulbs with signal processing technology can transfer high-definition video to computers. He invented the term Li-Fi and founded PureVLC, a private company, to use this technology (aka Visible Light Communication Technology, or VLC for short).
Since LED bulbs are very popular and lighting infrastructure is in place, Li-Fi technology is expected to be cheaper and more energy-efficient than existing radio communication systems.
Visible light is a part of the electromagnetic spectrum, 10,000 times larger than the radio spectrum, and can have relatively unlimited capacity. Professor Haas said that its other advantage is that evenly distributed LED transmitters can provide a more stable and regional Internet connection to the entire building. The disadvantage of traditional Wi-Fi is that the farther you get from it, the weaker the signal you get and the more unstable the wireless connection in your office and home.
Professor Haas also believes that VLC technology may be more secure than traditional Wi-Fi connections because light cannot pass through walls.
Hebei Haiao Wire Mesh Products Co., Ltd. , https://www.haiaowiremeshfencing.com