What is Li-Fi Li-Fi is the transmission of wireless data by using visible light as a medium of communication. Also known as Light Fidelity, Li-Fi uses subtle fluctuations in LED light to transmit data from the transmitter to the receiver. To encode the data, the LED light is switched on and off at an imperceptible speed creating slight fluctuations that is invisible to the naked eye. These fluctuations generate binary codes that are transmitted to the receiver which decodes the data back into digital form. There are two main components of a Li-Fi system: A transmitter that is often a high brightness LED light a receiver which is often a photodiode fitted into the receiver to convert light back into digital data. Li-fi technology is much faster as compared to the traditional Wi-Fi technology. It is capable of transmitting data up to 100 Mbps. In some cases, by using parallel transmission, more than 10 Gbps of data can also be transmitted. This means that you can download high definition 1080p videos in mere seconds. Li-Fi is a powerful technology that has the potential to transform our lives by allowing us to transmit data from simple LED bulbs that are already being used in most homes and offices. All homes, offices and other facilities are equipped with lighting. Think about how much energy we can transmit if each of those bulbs is upgraded to LED bulbs fit to be used for Light Fidelity. This could translate into a much bigger coverage than the coverage capacity of traditional Wi-Fi modems. Brief History Li-Fi technology was first introduced by a German Professor, Physicist and communications technology innovator, Herald Haas, at a TED talk in July 2011. In his talk, Herald demonstrated how energy can be transmitted from a light bulb by inducing subtle changes in the amplitude of the light bulb in such high speed that they are not visible to the human eye. Herald demonstrated Li-Fi to the audience by the playing a high-definition video of a flower that was solely transmitted using a led table lamp with an LED bulb. Herald helped start a company pure Li-Fi to commercialize Li-Fi products and integrate them with the existing LED lighting systems. In October 2011, a number of industry groups and companies joined hands to form the Li-Fi consortium with an aim to promote the use of high speed optical wireless transmission. Since its first public demonstration in 2011, the Li-Fi technology has evolved significantly over time. By August 2014, data transmission exceeding 1.4Gbps was demonstrated by using Li-Fi technology. Today, Li-Fi has been deployed in more than 20 countries. It continues to grow as more and more companies and industries are exploring what Li-Fi can do in their businesses. How it is different from Wi-Fi The main difference between Wi-Fi and Li-Fi is based on the medium used to transmit data. Wi-Fi transmits data wirelessly over modems by using radio waves. In contrast, Li-Fi uses visible light to transmit and receive data over LED light bulbs. Pros of Lifi Li-Fi technology offers many advantages over the traditional Wi-Fi. Some of the major advantages of Li-Fi have been described below: High-Speed Data transmission over Li-Fi is a hundred times faster than data transmission over Wi-Fi. At this speed, a high-definition video can be downloaded in mere seconds. Li-Fi can deliver speeds as high as 1Gpbs. Capacity Wi-Fi is being used in almost all residential and commercial areas. Due to this, radio frequency spectrum occupancy is increasing day by day limiting the capacity of data that can be transmitted over radio waves. At... read more
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