Visible Light Communication (VLC)

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.

Modulation

Amplitude Switch Keying (ASK)
Phase Switch Keying (PSK)
Frequency Switch Keying (FSK)
On-Off Keying

Li-Fi

Li-Fi is a VLC communication protocol which uses the ultraviolet, visible and infrared spectrum to transmit data at high speeds.