1 5 / 0 3 / 2 0 2 2 1 LIFI TECHNOLOGY
• LI-FI is transmission of data through illumination ,ie sending data through a LED light bulb that varies in intensity faster than human eye can follow.
DEFINITION
HISTORY Professor harald haas, from the university of edinburgh in the UK, is widely recognised as the original
founder of li-fi.
The general term visible light communication (vlc), includes any use of the visible light portion of the electromagnetic spectrum to transmit information.
The d-light project at edinburgh's institute for digital communications was funded from january 2010 to january 2012.
Haas promoted this technology in his 2011 ted global talk and helped start a company to market it.
Pure lifi, formerly pure vlc, is an original equipment manufacturer (oem) firm set up to commercialize li-fi products for integration with existing led-lighting systems.
By august 2013, data rates of over 1.6 gbit/s were demonstrated over a single colour LED.
Different Electromagnetic Spectrums and their potentiality
Radio Waves
Infrared Visible Ultraviolet X Rays Gamma Rays
In sufficient spectrum for increasing data
Low power application
Which is not used so far.
Used for hospitals and security checking
It is not used generally
Dangerous for human body
Properties Of LIFI
LIGHT-BASED WI-FI UNUTILIZED ELECTROMAGNETIC SPECTRUM IS
USED NO MAJOR ILL EFFECT
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Source
1. Bulb: RF power amplifier circuit (PA)
2. Printed circuit board (PCB)
3. Enclosure
Receiver
1. A silicon photodiode, which shows good response to visible wavelength region serving as the receiving element.
LIFI Architecture The novel architecture of Li-Fi technology is based on the MLU, AL and Li-Fi cloud.
The MLU is extended to the ALs where every AL has their own Li-Fi cloud to provide internet and other services connectivity through light.
The main line is connected to the MLU and further it is extended to small nodes which are LED bulbs or lamps e.g. AL1, AL2, AL3 and AL4
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LIFI Architecture cont..
Dimension of LED Lamp or Bulb
Placement and positioning (PP) dimension
Internal structure design (ISD) dimension
Fixed Position Movable Position
• Places where Wi-Fi isn’t allowed due to radiation concerns
• In invasive bio medical instruments
HOSPITALS
• News Updates• Updates about Natural Calamity• Emergency Communication in Subway
stations and tunnels, and other common dead zones
• Cheap high-speed Web access to every street corner
Street Lamp Post
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CONCLUSION• Li-Fi may not be able to replace conventional radios altogether, but it could turbo charge the
development of wireless television and make it easier to throw a wireless signal across an entire house.
• Large scale areas that are saturated with radio signals or that doesn’t permit them for security reasons could use Li-Fi as an alternate high-speed wireless network solution.
• The possibilities are numerous and can be explored further, If this technology can be put into practical use , every bulb can be used something like a Wi-Fi hotspots to transmit wireless data.