The explosive growth of mobile Internet devices around the world, coupled with the gradual popularization of the concept of Internet-connected devices and smart homes in all areas of daily life, modern people's reliance on wireless networks is getting higher and higher.
At present, wireless networks mainly use radio waves in the 2GHz or 5GHz frequency band as the transmission medium. However, there is a light-emitting diode (LED) lighting device that uses the visible light part of the electromagnetic wave to transmit data. It has the opportunity to be used in conjunction with Wi-Fi. And Li-Fi, a new communication technology that solves the transmission volume of Wi-Fi, is about to enter our lives.
What is Li-Fi?
Li-Fi (Light Fidelity) is a technology based on visible light communication (visible light communicaTIon, referred to as VLC) technology, which can achieve two-way, high-speed wireless network transmission. .
Wi-Fi, a wireless communication system that most people are more familiar with, uses radio frequency (RF) signals for wireless communication, while Li-Fi uses visible light, which is different from infrared or ultraviolet communication, and can perform lighting and communication at the same time.
This new type of wireless communication technology was developed by Harlow of the University of Edinburgh in Scotland. Developed by Professor Harald Hass.
Haas, who publicly demonstrated this device using VLC at a 2011 TED talk, transmits a large amount of data with a flash of 400 to 800 megahertz (THz) from an LED light bulb, a bit like a lightwave version of Morse code that cannot be seen with the naked eye. Light bulbs are switched on and off at high speeds and in specific ways, using light to send electronic signals similar to binary code.
Li-Fi is not only extremely fast, can download large amounts of data, but also provides a more secure local area network, because light cannot pass through walls, which means less external interference.
Haas also outlined the vision of every household using light to surf the Internet in his speech: "We just need to install a small chip in any possible light-emitting device," Haas pointed out: "We can meet two basic needs of modern life at once." Lighting' and 'Wi-Fi'."
Practical applications of Li-Fi technology
Existing companies have conducted practical measurements of Li-Fi technology in general commercial and residential environments, and conducted research and development of related products.
Haas and his team founded PureLiFi, a Scottish wireless optical communication company, to create a plug-and-play secure wireless network application system. PureLiFi has cooperated with French LED lighting supplier Lucibel to develop Li-Fi lamps. The first product is expected to be available in the third quarter of 2016, hoping to integrate communication and lighting equipment and create more possibilities for smart homes.
Velmenni, an Estonian innovation company, also used Jugnu smart LED bulb products to conduct Li-Fi tests in commercial offices and industries in 2015. The team successfully used visible light to transfer a set of text file data from personal computers and laptops to microcontroller boards. , and achieve a transfer speed of 1 GBps.
Velmenni's goal is to enable Jugnu smart LED light bulbs to transmit data to other light bulbs, mobile vehicles and the Internet. Velmenni CEO Deepak. Deepak Solanki told the British media IBTImes: "We are carrying out experimental plans for VLC technology in various industries. At present, we are designing a small lamp for the industry, which can transmit information with light, and also for a private customer. Set up a Li-Fi network that connects to their office network.â€
It is estimated that in the next few years, the popularity of commercial LED optical communication lamps will be seen on the market, and Li-Fi technology will fully expand the use of wireless networks through home lamps, street lamps, and even car headlights.
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