Li-Fi (Light Fidelity)

1. Introduction

Li_fi refers to light based comunication technology that delivers a high speed, bi-directional, mobile communications similar to wifi but more secure and with greater speed.

Li-Fi uses household LEDs to enable data transfer boosting transfer speed of 224 Gb/s.

2. Why the need for Li-Fi

In general mode of communication the transmitter is placed at a centre location and the data is transmitted from it across the centre point. Now as the distance between the user and the transmitter increases the density of the data transmitted decreases and the data speed is impacted .

Also as the data is tranmitted in every directional these data packets can be monitored by any unwanted guest and can be manipulated.

Now imagine a data transmitter which transmit at a straight line of sight which maintains a high data density and data distortion is very less, here the data transfer speed is not impacted as much as in other technology.

Also as the data is only transmitted in the confined environment and at a single line of sight then any other unwanted guest can not access the data.

Credit: PureLiFi
Credit: PureLiFi

3. Working

A LEDs outlet or bulb is fitted with a Li-Fi compatible driver which is connected to an internet source. This driver is used to switch on/off the led at a frequency which can not be seen by human eye.

By doing this it embed the beam of light with the binary data that needs to be transferred. A receiver dongle is needed to capture this binary data and convert it to readable form which is attached to the system. This form can be easily seen in the diagram given below.

Credit: google
Credit: google

4. Disadvantages

Nothing is perfect in this world and so does Li-Fi.

  • The signal can not pass through walls which is good in terms of security but can be bothersome as different LEDs needs to be installed in different room.
  • Only works if the direct line of sight is maintained between transmitter and receiver.
  • This technology is good for broadcast but the upload link is very bad as the receiver also needs to have a special transmitter to maintain a good upload speed.

5. Applications

  • Underwater communications: Since radio waves cannot be used under water because these waves are strongly absorbed by sea water within feet of their transmission and this renders it unusable underwater but LIFI is suitable for underwater communication.
  • Health sector: Since WIFI is not safe to be used in hospitals and other various health care sectors because it penetrates human body and interfere with the machines. LIFI can be implemented and well suit in this sector.
  • Internet anywhere: street lamps can be used to access internet anywhere in footpaths, roads, malls, anywhere where light source is available.
  • Vehicle and transportation: LED headlights and tail-lights are being introduced.This can be used for vehicle-to-vehicle communication. This can be applied for road safety and traffic management.

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