Light Fidelity or Li-Fi is a Visible Light Communications (VLC) system running wireless communications travelling at very high speeds..As more and more people and their many devices access wireless internet, clogged airwaves make it difficult to latch onto a reliable signal. But radio waves are just one part of the spectrum that can carry our data. What if we could use other waves to surf the internet?A new technology uses a part of the electromagnetic spectrum that is not greatly utilized- The Visible Spectrum.The solution,called as “Data Through Illumination”—taking the fiber out of fiber optics by sending data through an LED light bulb that varies in intensity faster than the human eye can follow.D-Light, can produce data rates faster than 10 megabits per second, which is faster than average broadband connection.Hence LED lamps that can light a room as well as transmit and receive information.
It is possible to encode data in the light by varying the rate at which the LEDs flicker on and off to give different strings of 1s and 0s. Parallel data transmission using arrays of LEDs, enables each LED to transmit a different data stream.Li-Fi is implemented using white LED light bulbs at the downlink transmitter.If the LED is on, you transmit a digital 1, if it’s off you transmit a 0.All that is required is some LEDs and a controller that code data into those LEDs,where the rate at which the LED’s flicker is varied depending upon the data we want to encode .
A solution for mobile devices to be always connected to network is incidence light,which is the light reflected from light sources.
Data is fed into an LED light bulb (with signal processing technology), it then sends data (embedded in its beam) at rapid speeds to the photo-detector (photodiode).The tiny changes in the rapid dimming of LED bulbs is then converted by the 'receiver' into electrical signal.The signal is then converted back into a binary data stream that we would recognise as web, video and audio applications that run on internet enabled devices .
Bandwidth: The visible light spectrum is plentiful (10,000 more than RF spectrum), unlicensed and free to use.
Data density: Li-Fi can acheive about 1000 times the data density of Wi-Fi because visible light can be well contained in a tight illumination area.
High speed: Very high data rates can be achieved due to low interference, high device bandwidths and high intensity optical output.
Low cost: Requires fewer components than radio technology.
Energy: LED illumination is already efficient and the data transmission requires negligible additional power.
Environment: RF transmission and propagation in water is extremely difficult but Li-Fi works well in this environment.
Safe: Life on earth has evolved through exposure to visible light. There are no known safety or health concerns for this technology.
Non-hazardous: The transmission of light avoids the use of radio frequencies which can dangerously interfere with electronic circuitry in certain environments.
Security:Due to its shorter range, Li-Fi is more secure than Wi-Fi
Smart Lighting: Any private or public lighting including street lamps can be used to provide Li-Fi hotspots.
Mobile Connectivity: Laptops, smart phones, tablets and other mobile devices can interconnect directly using Li-Fi. Short range links give very high data rates and also provides security.
Hazardous Environments: Li-Fi provides a safe alternative to electromagnetic interference from radio frequency communications in environments such as mines and petrochemical plants.
Hospital & Healthcare: Li-Fi emits no electromagnetic interference and so does not interfere with medical instruments, nor is it interfered with by MRI scanners.
Aviation: Li-Fi can be used to reduce weight and cabling and add flexibility to seating layouts in aircraft passenger cabins where LED lights are already deployed.
Underwater Communications: Due to strong signal absorption in water, RF use is impractical. Acoustic waves disturb marine life.
Vehicles & Transportation: LED headlights and tail-lights are being introduced. Street lamps, signage and traffic signals are also moving to LED. This can be used for vehicle-to-vehicle and vehicle-to-roadside communications. This can be applied for road safety and traffic management.
Drawback
Li-Fi technology requires a prefect line-of-sight to transmit data
It is possible to encode data in the light by varying the rate at which the LEDs flicker on and off to give different strings of 1s and 0s. Parallel data transmission using arrays of LEDs, enables each LED to transmit a different data stream.Li-Fi is implemented using white LED light bulbs at the downlink transmitter.If the LED is on, you transmit a digital 1, if it’s off you transmit a 0.All that is required is some LEDs and a controller that code data into those LEDs,where the rate at which the LED’s flicker is varied depending upon the data we want to encode .
A solution for mobile devices to be always connected to network is incidence light,which is the light reflected from light sources.
Working
Data is fed into an LED light bulb (with signal processing technology), it then sends data (embedded in its beam) at rapid speeds to the photo-detector (photodiode).The tiny changes in the rapid dimming of LED bulbs is then converted by the 'receiver' into electrical signal.The signal is then converted back into a binary data stream that we would recognise as web, video and audio applications that run on internet enabled devices .Features
Bandwidth: The visible light spectrum is plentiful (10,000 more than RF spectrum), unlicensed and free to use.
Data density: Li-Fi can acheive about 1000 times the data density of Wi-Fi because visible light can be well contained in a tight illumination area.
High speed: Very high data rates can be achieved due to low interference, high device bandwidths and high intensity optical output.
Low cost: Requires fewer components than radio technology.
Energy: LED illumination is already efficient and the data transmission requires negligible additional power.
Environment: RF transmission and propagation in water is extremely difficult but Li-Fi works well in this environment.
Safe: Life on earth has evolved through exposure to visible light. There are no known safety or health concerns for this technology.
Non-hazardous: The transmission of light avoids the use of radio frequencies which can dangerously interfere with electronic circuitry in certain environments.
Security:Due to its shorter range, Li-Fi is more secure than Wi-Fi
Applications
Smart Lighting: Any private or public lighting including street lamps can be used to provide Li-Fi hotspots.
Mobile Connectivity: Laptops, smart phones, tablets and other mobile devices can interconnect directly using Li-Fi. Short range links give very high data rates and also provides security.
Hazardous Environments: Li-Fi provides a safe alternative to electromagnetic interference from radio frequency communications in environments such as mines and petrochemical plants.
Hospital & Healthcare: Li-Fi emits no electromagnetic interference and so does not interfere with medical instruments, nor is it interfered with by MRI scanners.
Aviation: Li-Fi can be used to reduce weight and cabling and add flexibility to seating layouts in aircraft passenger cabins where LED lights are already deployed.
Underwater Communications: Due to strong signal absorption in water, RF use is impractical. Acoustic waves disturb marine life.
Vehicles & Transportation: LED headlights and tail-lights are being introduced. Street lamps, signage and traffic signals are also moving to LED. This can be used for vehicle-to-vehicle and vehicle-to-roadside communications. This can be applied for road safety and traffic management.
Drawback
Li-Fi technology requires a prefect line-of-sight to transmit data
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