Free-space optical communication

Free-space optical communication (FSO) is an optical communication technology that uses light propagating in free space to wirelessly transmit data for telecommunications or computer networking. "Free space" means air, outer space, vacuum, or something similar. This contrasts with using solids such as optical fiber cable.

This article is about optical communication over long distances. For short- to medium-range communication, see Optical wireless communications.

The technology is useful where the physical connections are impractical due to high costs or other considerations.

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