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[{"type":"txt","id":"rich_1459950430821","data":" \"In the future we will not only have 14 billion light bulbs, we may have 14 billion Li-Fi,s deployed worldwide for a cleaner, greener, and even brighter future.\"<\/p> \nWhat is LiFi ?<\/b><\/u><img class=\"stumagz-image\" id=\"img1459951008165\" src=\"http:\/\/stumagz.com\/public\/uploads\/570515b07eeaestryimg\" style=\"letter-spacing: -0.003em; font-family: Lato, sans-serif; display: initial;\"><\/p>                                            LiFi[light fidelity] is high-speed, bidirectional, mobile and wireless networked communication technology similar to wifi.It uses visible light communication.With LiFi technology, data travels in the visible light spectrum through LEDs. This makes it possible to provide wireless internet access at speeds of over 100 Gbps, although this is still in the Lab.<\/p> \n\n\n \n\nLiFi and VLC :<\/b><\/u><\/p>                                                           LiFi is different from VLC as it is the overall concept that includes unidirectional and low data speed transfer of data, unlikeLiFi, VLC does not typically provide wireless Internet access. One could argue that even smoke signals are technically VLC. This is how modern VLC works.<\/p> \n\u2022\tLiFi allows users to roam between lamps and still have connectivity as well as multiple users connecting to the same light and still getting different data streams<\/p> \n\u2022\t Roaming \u2013 allows users to move freely between lights and maintain a Skype Video Call.<\/p> \n\u2022\tMultiple Access \u2013 a single light can let different people browse the internet at the same time<\/p> \nHistory :<\/b><\/u><img class=\"stumagz-image\" id=\"img1459950932190\" src=\"http:\/\/stumagz.com\/public\/uploads\/5705156f7dee4stryimg\" style=\"letter-spacing: -0.003em; font-family: Lato, sans-serif; display: initial;\"><\/p>\n \n                                                 Herald Haas, who teaches at the university of Edinburgh in UK,coined the term LiFi at hi TED global talk where he introduced the idea of \u201cwireless data from every light\u201d.He is the chair person of mobile communications at the university of Edinburgh and Co-founder of Pure LiFi. \nPure LiFi is the first company to demonstrate LiFi system. The D-light project at edinburgh\u2019s institute for digital communications was funded from jan 2010 to jan 2012.Haas promoted this technology in his 2011 TED global talk and helped to start a company to market it.<\/p> \n\u2022\tHaas and his team who have launched Pure LiFi demonstrated the first commercially available LiFi system Li-1st with a capacity of 11.5 MB per second, which is comparable to first generation Wi-Fi at 2014 MWC in Barcelona. <\/p> \n\u2022\tThe Li-Flame is the world\u2019s first true LiFi system. The public demonstration was at Mobile World Congress in Barcelona in March 2015. <\/p>                                             VLC technology was exhibited in 2012 using LiFi.By august 2013 data rates over 1.6 Gb\/s were demonstrated over single color LED.Many companies started working on this technology.Russian company Stins Coman announced development of LiFi called BEAM CASTER in 2014.Sisoft(Mexican company) in 2014 set record to transfer data at speeds of up to 10 Gb\/s. <\/p>  \nHow does LiFi work?<\/b><\/u><img class=\"stumagz-image\" id=\"img1459950993269\" src=\"http:\/\/stumagz.com\/public\/uploads\/570515a2bc6d7stryimg\" style=\"letter-spacing: -0.003em; font-family: Lato, sans-serif; display: initial;\"><\/p>                                                  \nWhen a constant current is applied to an LED light bulb a constant stream of photons are emitted from the bulb which is observed as visible light. If the current is varied slowly the output intensity of the light dims up and down and it works by switching the current to LED off and on at a very high rate. Because LED bulbs are semi-conductor devices, the current, and hence the optical output, can be modulated at extremely high speeds which can be detected by a photo-detector device and converted back to electrical current. The intensity modulation is imperceptible to the human eye, and thus communication is just as seamless as RF. <\/p>                                                   Using this technique, high speed information can be transmitted from an LED light bulb.\n Radio frequency communication requires radio circuits, antennas and complex receivers, whereas Li-Fi is much simpler and uses direct modulation methods similar to those used in low-cost infra-red communications devices such as remote control units. Infra-red communication is limited in power due to eye safety requirements, whereas LED light bulbs have high intensities and can achieve very large data rates\n\nFeatures\nLi-Fi features include benefits to the capacity, energy efficiency, safety and security of a wireless system with a number of key benefits over Wi-Fi but is inherently a complementary technology. <\/p>Capacity :<\/u><\/b><\/p> \nBandwidth:<\/b><\/u> The visible light spectrum is plentiful (10,000 more than RF spectrum), unlicensed and free to use.<\/p> \nData density: <\/b><\/u>Li-Fi can acheive about 1000 times the data density of Wi-Fi because visible light can be well contained in a tight illumination area whereas RF tends to spread out and cause interference.<\/p> \nHigh speed:<\/u><\/b> Very high data rates can be achieved due to low interference, high device bandwidths and high intensity optical output.<\/p> \nEFFICIENCY:<\/u><\/b><\/p> \nLow cost:<\/u><\/b> Requires fewer components than radio technology.\nEnergy: LED illumination is already efficient and the data transmission requires negligible additional power.\nEnvironment: RF transmission and propagation in water is extremely difficult but Li-Fi works well in this environment.\nSafety <\/p>Safe:<\/u><\/b> Life on earth has evolved through exposure to visible light. There are no known safety or health concerns for this technology. <\/p>Non-hazardous:<\/u><\/b> The transmission of light avoids the use of radio frequencies which can dangerously interfere with electronic circuitry in certain environments. <\/p>SECURITY<\/u><\/b><\/p> \nLiFi is more secure than WiFi as it confined to closed area because light will not pass through walls.<\/p> \nControl:<\/u><\/b> Data may be directed from one device to another and the user can see where the data is going; there is no need for additional security such as pairing for RF interconnections such as Bluetooth.<\/p> \n\u2022\tShort range ,low reliability and high installation costs are potential down sides <\/p>"},{"type":"img","id":"img-uid-1459951008165","data":"570515b07eeae"},{"type":"img","id":"img-uid-1459950993269","data":"570515a2bc6d7"},{"type":"img","id":"img-uid-1459950932190","data":"5705156f7dee4"}]

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