Yes! It is possible now! by simply switching on the light bulb or LED, you can also switch on the wireless internet connection at home. The British Physicist of Edinburgh University Prof. Harald Hass who claims to have developed a technology which can send data through the same connection as a normal lamp.Prof. Harald says the invention , dubbed D-light can send data faster than 10 megabits/second, which is the speed of a typical broadband connection, by altering the frequency of the ambient light in the room. He says the other possibilities of the device which he has dubbed "Li-Fi", or Light Fidelity include sending wireless data from 'white space' in your TV spectrum and unused satellite signals. He said he could turn all incandescent bulbs and LED's into internet transmitters.
It has applications in Hospitals, Airplanes where passengers can browse internet through signals beamed out of the bulb on board, Military and even in underwater. The visible light spectrum has 10000 times more space than radio waves which gives wide range for communication using this.
"The way we transmit wireless data is inefficient electromagnetic waves, in particular radio waves which are limited, they are sparse, they are expensive and only have a certain range. "It is this limitation which does not cope with wireless data, and we are running out of efficiency. Light is part of the electromagnetic spectrum... wouldn't it be great to use it for wireless communications?" Prof. Hass said.
Working: With the aid of a special component, the modulator, we turn the LED's off and on in very rapid succession and transfer the information as ones and zeros. The modulation of the light is imperceptible to the human eye. A simple photo diode on the laptop acts as a receiver. The diode catches the light, electronics decode the information and translate it into electrical impulses, meaning the language of the computer. The solution, which could be installed on ceilings and would cover approximately 10 square meters, would be ideal for HD video streaming and inside Hospitals or Aircraft where traditional Wi-Fi is often banned. However visible light signals can easily be blocked, such as when a hand is passed in front of the transmitter."
It has applications in Hospitals, Airplanes where passengers can browse internet through signals beamed out of the bulb on board, Military and even in underwater. The visible light spectrum has 10000 times more space than radio waves which gives wide range for communication using this.
"The way we transmit wireless data is inefficient electromagnetic waves, in particular radio waves which are limited, they are sparse, they are expensive and only have a certain range. "It is this limitation which does not cope with wireless data, and we are running out of efficiency. Light is part of the electromagnetic spectrum... wouldn't it be great to use it for wireless communications?" Prof. Hass said.
Working: With the aid of a special component, the modulator, we turn the LED's off and on in very rapid succession and transfer the information as ones and zeros. The modulation of the light is imperceptible to the human eye. A simple photo diode on the laptop acts as a receiver. The diode catches the light, electronics decode the information and translate it into electrical impulses, meaning the language of the computer. The solution, which could be installed on ceilings and would cover approximately 10 square meters, would be ideal for HD video streaming and inside Hospitals or Aircraft where traditional Wi-Fi is often banned. However visible light signals can easily be blocked, such as when a hand is passed in front of the transmitter."
