Li-Fi TECHNOLOGY

Li-Fi is a wireless optical networking technology that uses light-emitting diodes (LEDs) for data transmission.It works similar to Wi-Fi but it uses light signals. so we can say that , Li-Fi is light based Wi-Fi. and it uses light instead of radio waves to transmit information. 

  short history:

The term Li-Fi was coined by Professor Harald Hass , university of Edinburgh during a TED TALK in 2011. Hass presented light bulbs that could act as wireless routers. Subsequently, in 2012 , Hass set up company pureLiFi with the aim "to be the world leader in Visible Light communication technology".

How it works:

Data from the internet and the local network is used to modulate the intensity of the LED light source in a way undetectable to the human eye . The photo detector picks up the signal , which is converted back into a data stream and sent to the client . The client can communicate through its own LED output or over the existing network .

Reason for an alternate technology:

1.capacity

2.Efficientcy

3.Availability

4.Security

Li-Fi vs Wi-Fi:

1. On the basic of security Wi-Fi is not secured it can be hacked but the Li-Fi is secured than that of the Wi-Fi because it not easy to hacked.

2. On the basic of data transmission rate Wi-Fi is slower as it use radio waves but Li-Fi  is much faster as it uses visible light .

3. The range of the Wi-Fi is small in compare to that of the Li-Fi.

4.Wi-Fi can be used usually inside a building but the Li-Fi can be used anywhere, where light source is present .

5.On the basic of the cost we can say that Li-Fi is cheap in comparison to that of the Wi-Fi.

6.Working concept of the Wi-Fi is base on various topologies while working concept of the Li-Fi is based on direct binary data serving.

 Application of Li-Fi:

1. Smart lightening(street lamps)

2. Mobile connectivity 

3.We can use it in mines 

4. Aeroplanes 

5. underwater

6. In cars 

7. Hospitals

Advantages of Li-Fi:

*Radio waves are harmful for human being as they penetrate the body and may cause mutation . So Li-Fi is safe.

*It is very secure (no-body can hack it)since no signal penetration through walls.

*Tremendous data transfer rates.

*It works under water. its utility is limited by the distance light can penetrate water. Significant amounts of light do not penetrate further than 200 meters. Past 1000 meters, no light penetrates. , Also it can be used in aero planes, so it is benificial in many fields.

*Vehicles could communicate with one another via front and back lights to increase road safety. Also street lights and traffic signals could also provide information about current road situations.

Disadvantages of Li-Fi:

*These signals cannot penetrate walls. so the person needs wired bulb in that room also.

*Only works is there is direct line of sight between source and receiver.

Conclusion:

Every light bulbs can be converted into Li-Fi signal receptor to transfer data and we could proceed towards the cleaner, safer, greener and brighter future. It will also allow internet in those places where radio based wireless system isnot allowed . One thing for sure, Li-Fi is the future of mobile internet .