The term Li-Fi or Light Fidelity was coined by professor Harald Haas from the University Of Edinburg in the UK. He explained how we can use visible light as a carrier for data transmision instead of traditional radio waves which are used in Wi-Fi.
Li-Fi uses a completely different and bigger part of electromagnetic spectrum as compared to that of Wi-Fi.
Two main things are required for the data transmission:
1. A source of light. (e.g. A bulb consisting of many tiny LEDs)
2. A photoelectric receiver on our device (phone,laptop etc)
Advantages:
• Faster data transmission. (Researchers have reached upto 10 Gbps)
• Low cost (instead of using long cables running through a building, a point-to-point array of LEDs can be used)
• Can be used in Airports and Hospitals where us of Radio Frequency is prohibited.
Disadvantages:
• As light can't pass through any solid object, we may need a different access point for each room.
• If the receiver of our device is blocked then the connection will break.
You can watch Harald Haas demonstrating Li-Fi for the first time on TED.
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