Li-Fi Technology

 

What is Li-Fi?           

Li Fi, also known as "Light Fidelity" is a wireless optical networking technology, which uses light emitting diodes (LEDs) to transmit data.  In 2011, professor Harald Haas made a Li Fi demonstration at the TED (Technology, Entertainment, Design) Global Talk on Visible Light Communication (VLC)

VLC uses light as medium to deliver high-speed communication in a manner similar to Wi-Fi and complies with the IEEE standard IEEE 802.15.7. The IEEE 802.15.7 is a high-speed, bidirectional and fully networked wireless communication technology based standard similar to Wi-Fi’s IEEE 802.11.


How does Li Fi work?

LiFi is high speed, bidirectional, and fully networked wireless communication of data using light. LiFi consists of several lightbulbs that form a wireless network.


When an electrical current is applied to a LED light bulb a stream of light (photons) is emitted from the bulb. LED bulbs are semiconductor devices, which means that the brightness of the light flowing through them can be changed at extremely high speeds. This means that the signal can be sent by modulating the light at different rates. The signal can then be received by a detector which interprets the changes in light intensity (the signal) as data.  Also when the LED is ON, you transmit a digital 1 and when it is OFF you transmit  0.  

The intensity modulation cannot be seen by the human eye, and thus communication is just as seamless as other radio systems, allowing the users to be connected where there is LiFi enabled light. Using this technique, data can be transmitted from a LED light bulb and back at high speeds.

 

Cost of Li Fi:

Getting Li Fi products from different Li Fi companies can be very expensive for consumers. According to pure LiFi, they are currently working towards miniaturization of LiFi technology as well as making it affordable for consumers in the long run. Ultimately the end goal is to have LiFi in every mobile device. This means that the technology will be affordable for integration into handsets, tablets and laptops.


Ultimately the end consumer will see minimal or no cost associated with LiFi as the goal is to have LiFi embedded in every wireless mobile device.  Today companies can speak to pure LiFi about working with us on proof of concept projects and other types of installations. These installations are priced based on individual requirements.

Want to know more about MIT College of Railway Engineering and Research Barshi, MH. 

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