VISIBLE LIGHT COMMUNICATION (VLC)
Visible Light Communication (VLC)
Article by:
Geoffrey Hunter
Date Published: | |
Last Modified: |
1. Overview
Visible light communication (VLC) is a family of communication protocols which use visible light (electromagnetic radiation between 400-800THz, or 375-780nm) to transfer information. Light sources such as LEDs are used to send information, and receivers such as photodiodes, phototransistors and arrays of such (eg. cameras) are used as receivers.
2. Modulation
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Amplitude Switch Keying (ASK)
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Phase Switch Keying (PSK)
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Frequency Switch Keying (FSK)
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On-Off Keying
3. Li-Fi
Li-Fi is a VLC communication protocol which uses the ultraviolet, visible and infrared spectrum to transmit data at high speeds.
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