What if every light bulb in the world could also transmit data? At TEDGlobal, Harald Haas demonstrates, for the first time, a device that could do exactly that. By flickering the light from a single LED, a change too quick for the human eye to detect, he can transmit far more data than a cellular tower — and do it in a way that’s more efficient, secure and widespread.
Who is Harold Haas?
Harald Haas is the pioneer behind a new technology that can communicate as well as illuminate
Read more about him Click here
Watch his Video below which is on Ted Talk . Article Excerpt from Ted Talk
LiFi is not the replacement of WiFi technology. It can be considered as incredible companion of the WiFi technology. It operates between 380 nm to 780 nm optical range. LiFi is used to exchange data incredibly rapidly and securely at much lower power level compare to WiFi.
Below is the internet architecture diagram flow
What is the Difference between LiFi vs WiFi, here are some basic and common differences between the two technologies
Below table shows your a comparision
||LiFi transmits data using light with the help of LED bulbs.
||WiFi transmits data using radio waves with the help of WiFi router.
||Do not have any intereference issues similar to radio frequency waves.
||Will have intereference issues from nearby access points(routers)
||Present IrDA compliant devices
||WLAN 802.11a/b/g/n/ac/ad standard compliant devices
||Used in airlines, undersea explorations, operation theaters in the hospitals, office and home premises for data transfer and internet browsing
||Used for internet browsing with the help of wifi kiosks or wifi hotspots
||Interference is less, can pass through salty sea water, works in densy region
||Interference is more, can not pass through sea water, works in less densy region
||In LiFi, light is blocked by the walls and hence will provide more secure data transfer
||In WiFi, RF signal can not be blocked by the walls and hence need to employ techniques to achieve secure data transfer.
|Data transfer speed
||About 1 Gbps
||WLAN-11n offers 150Mbps, About 1-2 Gbps can be achieved using WiGig/Giga-IR
|Frequency of operation
||10 thousand times frequency spectrum of the radio
||2.4GHz, 4.9GHz and 5GHz
||Works in high dense environment
||Works in less dense environment due to interference related issues
||About 10 meters
||About 32 meters (WLAN 802.11b/11g), vary based on transmit power and antenna type
||Lamp driver, LED bulb(lamp) and photo detector will make up complete LiFi system.
||requires routers to be installed, subscriber devices(laptops,PDAs,desktops) are referred as stations
Light Fidelity (Li-Fi ) is a bidirectional, high speed and fully networked wireless communication technology similar to Wi-Fi. The term was coined by Harald Haas and is a form of visible light communication and a subset of optical wireless communications (OWC) and could be a complement to RF communication (Wi-Fi or Cellular network), or even a replacement in contexts of data broadcasting. It is so far measured to be about 100 times faster than some Wi-Fi implementations, reaching speeds of 224 gigabits per second.
It is wireless and uses visible light communication or infra-red and near ultraviolet (instead of radio frequency waves) spectrum, part of optical wireless communications technology, which carries much more information, and has been proposed as a solution to the RF-bandwidth limitations.
Source – Wikipedia