Optical communications

Li-Fi (commonly referred to as LiFi) is a wireless communication technology which utilizes light to transmit data and position between devices. The term was first introduced by Harald Haas during a 2011 TEDGlobal talk in Edinburgh.

flag used to communicate something about the ship flying it from a distance

computer hardware interface

visual telegraphy system conveying information at a distance by means of two maritime flags

smoke used as a mode of communication

system of visual communication

thumb|Fig. 1: Signaling with a Mance heliograph; Alaska–Canada border, 1910.

communication of ideas and information in forms that can be read or looked upon

communication at a distance using light to carry information

thumb|alt=An image of darkened brass historical plaque with a streak of green corrosion running down it, mounted on the exterior side of a brick building. |A historical plaque on the side of the Franklin School in Washington, D.C. which marks one of the points from which the photophone was demonstrated thumb|A diagram from one of Bell's 1880 papers

firearm that launches flares

concept in signal processing

visual signaling device for optical communication

light set which provides visual descent guidance for aircraft when approaching a runway for landing

communication using light sent through free space

aircraft lights

communications medium using fluorescent bulbs or LEDs

Masthead signals showing vessel status

Semaphore systems using water-based mechanisms

thumb|3D printed lens holder of KORUZA Scientific variant

form of optical communication

wavelength interval over which the magnitude of all spectral components is equal to or greater than a specified fraction of the magnitude of the component having the maximum value

U.S. National Historic Landmark research laboratory