WHAT IS LI-FI

INTRODUCTION| WHAT IS LI-FI -

 li-fi is the abbreviation of light light fidelity same as wi-fi. there are many similarities in li-fi and wi-fi. both of these two are used for transferring data from one place to another, one device to another, and also the device can share their location using li-fi. in li-fi light is used to transmit data. the term li-fi was first introduced in March 2011 by Harald Hass.
in technical terms, li-fi can transmit data using visible light, ultraviolet, and infrared spectrums. in its present state-led bulbs are used to transmit data. bulbs are switched on and off to transfer data. but the speed of turning off and off , so fast that it is not noticeable by human eyes and also does not create flickering.

DIFFERENCE BETWEEN LI-FI AND WI-FI:-

 The key difference between li-fi and wi-fi is that wi-fi uses a radio waver to transfer data, li-fi uses a light web/ light spectrum to transfer data. the bandwidth of wi-fi is limited where the bandwidth of li-fi is much expandable..the visible light spectrum is 100 times larger than total wi-fi frequency. li-fi also provides better speed and more reliability.

TECHNOLOGY DETAILS:-

li-fi is a derivative of optical wireless communication.it uses light-emitting diodes (LED) as a medium to deliver network, mobile, high-speed communication in a similar manner wi-fi do. visible light communication works by switching currents on and off in the LEDs very quickly, too quick to be noticed by human eyes, this does not present flicker. Although li-fi LEDs would have to be kept on to transmit data, they could be dimmed to below human visibility while still emitting enough light to transmit data. but there is a problem as light can not penetrate the walls li-fi is totally localized in a room. technologies that allow as roaming between various li-fi cells, also known as handover, may allow to the seamless transition between li-fi. but there is also a good side, as light can not pass the walls no one can remotely hack or access the li-fi network, thus giving us better reliability against hacking.
direct line of sight is not always necessary to li-fi be working, light reflected off the walls can achieve 70 Mbit/s
li-fi has the advantage of being useful in electromagnetic sensitives areas such as aircraft or in the hospital cabins. while US federal communications commissions have warned of a potential spectrum crisis because wi-fi is closed to full capacity,li-fi has almost no limitations on capacity. the visible light spectrum is 10,000 times larger than the entire radio frequency.researchers have reached data rates of over 224 Gbit/ s, which is much faster than wi-fi or broadband. short-range high installation charge are some potential downsides of li-fi

USES OF LI-FI:-

HUMAN AND BUILDING AUTOMATION:- 

 it is predicted that future home and building automation will highly depend on the li-fi technology for being secure and fast. As the light cannot penetrate through walls, the signal cannot be hacked or controlled remotely.

UNDERWATER APPLICATION:- 

  most remotely operated underwater vehicles are controlled by wired connections. The length of the wire places a hard limit on their operational field. science light can travel through water,li-fi based communications could offer much greater mobility. li-fi mobility is limited by the distance light can penetrate water.

AVIATION:-

 Efficient communication of data is possible in airborne environments such as a commercial passenger aircraft utilizing li-fi. Using this light-based data transmission will not interfere with other equipment in the aircraft.

HOSPITALS:- 

 Many treatments now involve multiple individuals, Li-Fi systems could be a better system to transmit communication about the information of patients. Besides providing higher speed, light waves also have little effect on medical instruments and human bodies. Wireless communication can be done during the use of such medical instruments without having to worry about radio interferences hindering the efficiency of the task.

Vehicles

Vehicles could communicate with one another via front and backlights to increase road safety. Street lights and traffic signals could also provide information about current road situations.

Industrial automation

Anywhere in industrial areas data has to be transmitted, Li-Fi is capable of replacing slip rings, sliding contacts and short cables, such as Industrial Ethernet. Due to the real-time of Li-Fi (which is often required for automation processes), it is also an alternative to common industrial Wireless LAN standards. Fraunhofer IPMS, a research organization in Germany states that they have developed a component that is very appropriate for industrial applications with time-sensitive data transmission.

Advertising

Street lamps can be used to display advertisements for nearby businesses or attractions on cellular devices as an individual passes through. A customer walking into a store and passing through the store's front lights can show current sales and promotions on the customer's cellular device.

Education

Students and teachers can be part of a more active educational community in a classroom that is Li-Fi enabled. Students with devices such as smartphones or laptops can communicate with the teacher, or with each other, to create a more efficient learning environment. Teachers can be able to collaborate with students to help better understand the class material.