(Sample Material) Study Kit on Current Affairs for UPSC Mains Exam: Science and Technology: Li-Fi
(Sample Material) Study Kit on Current Affairs for UPSC Mains Examination
Science and Technology: Li-Fi
- Light-Fidelity is a new technology that uses light waves, instead of radio frequency waves, as a medium to carry data. An improvised LED bulb, functions as a router. It can provide internet access 100 times faster than Wi-Fi.
- An ordinary off-the-shelf LED bulb connected to a device, which in turn is connected to the Internet.
- The Internet data flows in via the device’ into the bulb, and is carried by light waves.
- At the other end, light waves carrying the Internet data falls on a receiver or a dongle which is connected to the computer.
- ‘The technology uses the frequencies’ generated by LED bulbs which flicker on and off imperceptibly thousands of times a second to beam information through the air, leading it to be dubbed the “digital equivalent of Morse Code”.
- Visible light spectrum lsavailable in plenty, unlicensed and’ free to use
- Double benefit of a bulb giving us light as well as internet access
- Low interference leads to very high data speed
- Li-Fi works under water as well
- Not harmful, unlike RF that can· interfere with electronic circuitry
- Light won’t pass through walls, making eavesdropping nearly impossible
- LED illumination is already efficient and data transmission needs very little additional power.
- It can achieve about 1,000 times data density of Wi-Fi, since light can be contained in an area
- A disruptive technology that could transform business models, creates new opportunities, and is poised to be a $113 billion industry by 2022.
- The use of the light spectrum for Li-Fl overcomes the issues in traditional wireless communication, like the shortage of spectrum and network disruption because of interference as visible light spectrum is much larger than the radio frequency spectrum.
- In Li-Fi, anyone who has access to light can access the Internet. The system also allows users to move from one light source to another without losing their network connection.
- Li-fi has a place in hospitals because it does not create interference with medical materials.
- In supermarkets it could be used to give information about a product, or in museums about a painting, by using lamps placed nearby.
- It could also be useful on aircraft, in. underground garages and any place where lack of Internet connection is an issue.
- Though the inability of light rays to pass through walls and similar structures is seen as a major drawback of this technology but restriction by walls provides more security to the network and eliminates the risk of the signal leakage to eavesdropping.
- Also Li-Fi requires devices be equipped with additional technology such as a card reader, or donqle, to function. This gives it a “cost disadvantage”.