Professor Harald Haas, coined the term "Li-Fi" at his 2011 TED Global Talk where he introduced the idea of "Wireless data from every light". He is a Chair Professor of Mobile Communications at the University of Edinburgh and co-founder of pureLiFi.
Light Fidelity or Li-Fi is a Visible Light Communications (VLC) system running wireless communications travelling at very high speeds. Li-Fi uses common household LED (light emitting diodes) light bulbs to enable data transfer, boasting speeds of up to 224 gigabits per second.
Li-Fi data is transmitted by the LED bulbs and received by photoreceptors.
Advantages of Li-Fi-
- Higher speed than Wi-Fi.
- Efficiency- Li-Fi works on visible light . Since homes and offices already have LED bulbs for lighting purposes, the same source of light can be used to transmit data. Hence, it is very efficient in terms of costs as well as energy. Light must be on to transmit data, so when there is no need for light, it can be reduced to a point where it appears off to human eye, but is actually still on and working
- Security- One main advantage of Li-Fi is security. Since light cannot pass through opaque structures, Li-Fi Internet is available only to the users within a room and cannot be breached by users in other rooms or buildings.
Disadvantages of Li-Fi-
- With this technology, light source is must we can't use internet without light.
- Range is minimum because light range is minimum by physical barriers.
- A whole infrastructure need to be constructed for Li-Fi.
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