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LI – FI TECHNOLOGY 
Presented By 
Sirod Kumar 
Jaipur National University
LI- FI means – LIGHT FIDELITY 
 LI- FI is transmission of data 
through illumination,sending 
data through a led bulb that 
varies in intensity faster than 
human eye can follow.
 Very simply, if the LED 
is on, you transmit a 
digital 1, if it's off you 
transmit a digital 0. 
 They can be switched 
on and off very quickly, 
which gives an easy way 
Of transmitting data.
Li fi technology paper presentation, Li- Fi, VLC, Visible light communication,  photo detector, amplification and processing,
The LI-FI product consists of 4 primary 
sub-assemblies: 
 Bulb 
 RF power amplifier circuit (PA) 
 Printed circuit board (PCB) 
 Enclosure 
In RF driver 
PA is used to convert electrical energy into RF Power. 
PA is desgined for ruggedness and efficiency. 
 PA also contains control circuit for digital and 
analog lightning. 
Led bulb work as a projector of data. 
ENCLOSURE 
PA 
LED 
PCB
LED 
An RF (radio-frequency) signal is generated by the solid-state PA and is guided into 
an electric field about the bulb. 
The led is embeded with dielectric material. 
The work of dielectric material – guide RF energy and focus it to the bulb’s centre. 
The high concentration of energy in the electric field vaporizes the contents of the 
bulb to a plasma state at the bulb’s center. 
This controlled plasma generates an intense source of light.
Li fi technology paper presentation, Li- Fi, VLC, Visible light communication,  photo detector, amplification and processing,
is not used so far 
Which is not used so far 
Safe to use 
Larger bandwidth safe to 
use 
larger badwidth
Li fi technology paper presentation, Li- Fi, VLC, Visible light communication,  photo detector, amplification and processing,
Advantages:- 
 Large bandwidth 
 High secuirity 
 Fast data transfer 
 Reliable 
 Harmlessness (free from radio wave) 
 Low cost 
Challenging problems:- 
 Presence of light is essential 
 There should be line of sight 
 Works better with fluorescent light & 
led but very low efficiency with bulbs 
 shadowing
Where other transmission or 
frequencies could be hazardous:- 
* Used in petrolium or chemical 
plants 
* Used in aircrafts 
* Used in medical areas 
* Used in seminar-hall, home,office 
* Used in street lamp as open hotspot 
Wi-fi
This technology in which LED is 
working like a WI-FI hotspot to 
transmit wireless data ,moves 
toward the cleaner, greener, 
safer( from radio waves) and 
brighter future. 
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 hotspot to transmit 
wireless data and we will toward the cleaner, 
greener, safer( from radio waves), and brighter 
future.
Thanks 
and 
Any Queries

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Li fi technology paper presentation, Li- Fi, VLC, Visible light communication, photo detector, amplification and processing,

  • 1. LI – FI TECHNOLOGY Presented By Sirod Kumar Jaipur National University
  • 2. LI- FI means – LIGHT FIDELITY  LI- FI is transmission of data through illumination,sending data through a led bulb that varies in intensity faster than human eye can follow.
  • 3.  Very simply, if the LED is on, you transmit a digital 1, if it's off you transmit a digital 0.  They can be switched on and off very quickly, which gives an easy way Of transmitting data.
  • 5. The LI-FI product consists of 4 primary sub-assemblies:  Bulb  RF power amplifier circuit (PA)  Printed circuit board (PCB)  Enclosure In RF driver PA is used to convert electrical energy into RF Power. PA is desgined for ruggedness and efficiency.  PA also contains control circuit for digital and analog lightning. Led bulb work as a projector of data. ENCLOSURE PA LED PCB
  • 6. LED An RF (radio-frequency) signal is generated by the solid-state PA and is guided into an electric field about the bulb. The led is embeded with dielectric material. The work of dielectric material – guide RF energy and focus it to the bulb’s centre. The high concentration of energy in the electric field vaporizes the contents of the bulb to a plasma state at the bulb’s center. This controlled plasma generates an intense source of light.
  • 8. is not used so far Which is not used so far Safe to use Larger bandwidth safe to use larger badwidth
  • 10. Advantages:-  Large bandwidth  High secuirity  Fast data transfer  Reliable  Harmlessness (free from radio wave)  Low cost Challenging problems:-  Presence of light is essential  There should be line of sight  Works better with fluorescent light & led but very low efficiency with bulbs  shadowing
  • 11. Where other transmission or frequencies could be hazardous:- * Used in petrolium or chemical plants * Used in aircrafts * Used in medical areas * Used in seminar-hall, home,office * Used in street lamp as open hotspot Wi-fi
  • 12. This technology in which LED is working like a WI-FI hotspot to transmit wireless data ,moves toward the cleaner, greener, safer( from radio waves) and brighter future. 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 hotspot to transmit wireless data and we will toward the cleaner, greener, safer( from radio waves), and brighter future.
  • 13. Thanks and Any Queries