In the environment where wireless communication is prevalent, the threat of excessive exposure to electromagnetic waves by modern people is increasing. From the wide-area network of mobile communications to wireless local area networks, radio waves transmit information, and the higher the radio wave strength, the better the transmission efficiency. But the higher the potential risk to human health. Scientists are looking for wireless information transmission methods that do not use radio waves. Visible light is the best choice for human health. Optical communication using visible light to transmit information has become an alternative technology for wireless networks.
LED light as a base station
As early as 2000, Tanaka of Keio University in Japan and Chunshan et al. of the Sony Computer Science Institute proposed using LED lights as communication base stations for information transmission. In 2002, Tanaka and Xiaofeng proposed a set of combined power line carriers. Communication and LED visible light communication data transmission system; 2008 Japan Taiyo Yuden, show white LED wireless communication system, the maximum transmission distance of 20 meters.
In 2009, Brien and others at the University of Oxford in the United Kingdom reached a visible light communication technology with a communication rate of 100 Mb/s (million bits per second). In 2010, the Fraunhofer HHI Institute in Germany increased the transmission rate of visible light communication to 513 Mb/s.
Harald Haas, a professor at the University of Edinburgh in the UK in 2011, presented the LED visible light communication technology in a public speech and named it LiFi (Light Fidelity), which is only one word with the well-known WiFi. difference. In 2012, Haas established PureVLC (later renamed PureLiFi), developed LiFi products, and cooperated with French LED lighting company Lucibel in 2015. It plans to launch LiFi-enabled products this year.
Reduce electromagnetic wave flooding
After more than 10 years of research and development, LiFi has gone out of the laboratory to become a commoditable technology. Currently, LiFi technology has a maximum transmission rate of 224 Gb/s (1 billion bits per second), far exceeding the transmission rate of WiFi. Since LiFi transmits information through visible light, it must be transmitted within the reach of the LED bulb and cannot penetrate the wall.
This year is the first year of LiFi technology launch, PureLiFi and Lucibel will promote LiFi-enabled LED luminaires, which combine wireless transmission. By converting traditional luminaires into LED luminaires, LiFi can benefit from free riders and reduce the cost and barriers to building a LiFi infrastructure. The listing of LiFi-enabled LED lamps will be the pioneer of LiFi's entry into the market.
The biggest challenge in the popularization of LiFi technology is to create an ecosystem of LiFi, such as the development and marketing of IC chips supporting LiFi functions, and communication devices supporting LiFi (such as smart phones), which require time and investment.
Places sensitive to electromagnetic interference will be the places most likely to introduce LiFi. Hospitals, nuclear power plants, petrochemical plants, and aircraft cabins will be the most easily attacked bridgeheads for LiFi. The birth of LiFi technology will improve the quality of the network and achieve the benefits of reducing the proliferation of electromagnetic waves.
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