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August 08, 2016
Li-Fi
Daniel Joel
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In future it is suspected that every light bulb will be replaced by LED’s the reason is LI-FI .Li-Fi is acronym for light fidelity. The word fidelity means the ability of the receiver to reproduce all the signals. Light fidelity indicates transmission of data or information through light or illumination. The inventor defines it simply if LED is ON you transmit a digital ‘1’ and if it is OFF you transmit a digital ‘0’.Li-Fi is the  next version to Wi-Fi(wireless fidelity) as it overcomes some of the limitations of Wi-Fi like speed, application areas like medical and in aircraft, outreach in remote areas etc.

NEED FOR LI-FI:

When you are using mobile phone or pc connected to wireless internet we have to compete for bandwidth and sometimes we get frustrated with slow speeds when more than one devices are connected. To solve this problem German scientist Herald Hass found an alternative way and he calls it with “data through illumination” .He conveys that in future communication is done through Light in a room.

HOW IT GONNA WORK?

Li-Fi is transmission of data through illumination by taking fiber out of fiber optics by sending data through LED (light emitting diodes) light bulb that varies its intensity faster than human eye can follow. As said before  if LED is ON you transmit a digital ‘1’ and if it is OFF you transmit a digital ‘0.As the reaction time of LED’s to respond to the changes is very fast the transmission of data will also be fast. Theoretical calculations had proven that the rate of data transmission would be 224 giga bits per second.

*The requirements to adopt this technology are some LED’s and controller that code data into those LED’s

*Since it just uses light, it can be used safely in aircraft and in hospitals that are prone to interference from radio waves.

*Simply radio waves are replaced by light waves in new method called Li-Fi.

*This method of using rapid waves of light to transmit information wirelessly is referred as Visible Light Communication (VLC) the transmitting frequency in VLC is around is 400Thz to 800Thz.

MAJOR APPLICATION AREAS OF LIFI:

  1. IN FIELD OF MEDICAL: Most hospitals do not allow Wi-Fi to enter into operating rooms due to radiation concerns and even it is lagged by some other cellphones or iPod, but communication is necessary in operation theaters to treat patients.LI-FI overcomes it. I think many of we know about the properties of light like interference, diffraction, polarization etc. Diffraction means bending up of light around the edges or obstacles. This property helps LI-FI to increase its efficiency.
  1. AIRLINES: Where radio waves are not much efficient.
  2. OUTREACH IN REMOTE AREAS: As the equipment for Wi-Fi is necessary, it is not possible to lay plant anywhere but since here in LI-FI it is through light we just need LED’s and a controller.
  3. UNDERSEAS: As it is difficult to lay optical fibers beneath water, it is better to communicate with help of light and as salt water is good conductor of electricity it is easy to work with LI-FI
  4. FAST TRANSFER OF INFORMATION: As LED’s ON and OFF very quickly which gives nice opportunities for fast transmitting the data.
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