9:03 PM, November-12-2022
Li-Fi (also written as LiFi) is a wireless communication technology which utilizes light to transmit data and position between devices. The term was first introduced by Harald Haas during a 2011.
Li-Fi is a light communication system that is capable of transmitting data at high speeds over the visible light, ultraviolet, and infrared spectrums. In its present state, only LED lamps can be used for the transmission of data in visible light. In terms of its end user, the technology is similar to Wi-Fi, the key technical difference being that Wi-Fi uses radio frequency to induce a voltage in an antenna to transmit data, whereas Li-Fi uses the modulation of light intensity to transmit data.
Li-Fi is able to function in areas otherwise susceptible to electromagnetic interference (e.g. aircraft cabins, hospitals, or the military).
Light Fidelity technology is wireless communication device focused mainly on use of visible light between violet (800 THz) and red (four hundred THz). Li-Fi is based solely on propagation of information in defined and uniform fashion via amplitude modulation of light supply.
There is LED transmitter (light emitting) on one end and photo detector (light sensor) on other. Li-Fi operates very simple and fast. The data input to LED transmitter is encoded into light by varying the flickering rate at which binary code (1 and 0) is generated by LEDs flicker ‘on’ and ‘off’.
LED transmitter’s on / off operation which seems to be invisible to human eye as speed of LEDs is less than microsecond. By switching ON LED is logical ‘1’ it makes data transfer according to incoming binary codes, switching OFF is logical ‘0’.
Data can be encoded in light by varying rate at which LEDs flicker on and off to different combinations of 1s and 0s.
In Aircrafts: In air crafts, passengers get high-charges on low-speed internet, but using Li-Fi provides affordable fees for high-speed internet.
Health technologies: Wi-Fi has been replaced by Li-Fi in many hospitals because use of Wi-Fi in hospitals interferes with mobile devices and computers that block the monitoring equipment signals.
Disaster management: Li-Fi can be used as groundbreaking methods of correspondence in the midst of disaster, e.g. seismic tremor or, on other hand, hurricanes as subway stations and passages; common dead zones do not impede Li-Fi.
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