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RAHIL008
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I read that for VLC, they use toggling the LEDs ON/OFF to represent binaries. Why cannot we modulate the visible light like radio waves.
You can modulate the intensity of the light beam---by driving the LEDs with current that has a component proportional to the amplitude of the audio signal. But digital signal transmission can be made more immune to interfering sources, including sunlight.RAHIL008 said:I read that for VLC, they use toggling the LEDs ON/OFF to represent binaries. Why cannot we modulate the visible light like radio waves.
The LED or semiconductor laser can be pulsed on and off with its power supply.Drakkith said:Thanks for the link, Berkeman, I wasn't aware we were using those modulation methods in fiber optics. Am I correct in assuming they are still using either the light from the original laser or from another source to mix with/interfere with the signal and perform modulation/demodulation?
Visible Light Communication is a wireless communication technology that uses visible light, such as LED bulbs, to transmit data. It works by modulating the intensity of light at a very high speed, which is then received by a photodetector and decoded into data.
VLC differs from other wireless communication technologies, such as Wi-Fi and Bluetooth, in that it uses visible light instead of radio waves to transmit data. This makes it more secure, as visible light cannot penetrate walls and can be contained within a room.
VLC has several advantages, including high data transmission rates, low latency, and high security. It also has the potential to be used in areas where radio frequency communication is restricted, such as hospitals and airplanes.
One limitation of VLC is that it requires a direct line of sight between the transmitter and receiver, meaning obstacles such as walls can disrupt the signal. Additionally, VLC is still a relatively new technology and may not be widely available in all devices yet.
VLC can be used for indoor positioning, wireless internet access, and data transfer in places where radio frequency communication is not allowed. It can also be used for communication in underwater environments, as water does not disrupt visible light signals.