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  • Light-fidelity (LiFi) is a technology used for free-space communication using visible and near-visible light.
  • It is similar to Wireless Fidelity (WiFi), a technology for wireless local area network communication using microwaves.
  • Microwaves can pass through walls while transmitting signals whereas visible and near-visible light cannot pass through walls.
  • Thus it makes LiFi signal network more secure.
  • Scientists have recently added a new layer of security to LiFi.
  • Light bounces off from walls and falls on the receiver.
  • So wall boundaries can be used effectively for reflecting signals so that communication is maintained even without line-of-sight communication between the signal source and receiver.
  • Receiving detectors can receive both direct and reflected signals.
  • Walls painted with fluorescent and phosphorescent paints absorb and then emit light with marginal loss.
  • The paints continue to emit light even several hours after the original source of light has been switched off.
  • This makes the communication signal more effective and secure.

Basic Difference between LiFi and WiFi:

Full formstand for light fidelitystands for wireless fidelity
Invented/CoinedCoined by Prof. Harald Haas in 2011By NCR corporation on 1991
Operationit transmits data using light by the help of LED bulbsit transmits data using radio waves using wifi router
TechnologyPresent IrDA compliant devicesWLAN 802.11/b/g/n/ac/d standard compliant devices
Data Transfer SpeedAbout 1 GbpsRanges from 150Mbps to maximum of 2Gbps
Privacylight is blocked by the walls hence provide more secure data transferwalls cannot block radio waves so we need to employ more techniques to achieve secure data transfer
Frequency of operation10, 000 times frequency spectrum of the radio2.4Ghz, 4.9Ghz and 5Ghz
Coverage Distanceabout 10 metersabout 32 meters(vary based on transmit power and antenna type)
Data densitywork with high dense environmentwork in less dense environment due to interference related issues
Bare minimum Components usedLED bulb, LED driver and photo detectorRouters, Modems and access points
ApplicationsUsed in airlines, undersea exploration etcUsed for internet browsing with the help of wifi hotspot
December 2023