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  2. Visible light communication - Wikipedia

    en.wikipedia.org/wiki/Visible_light_communication

    Visible light is only a small portion of the electromagnetic spectrum. In telecommunications, visible light communication ( VLC) is the use of visible light ( light with a frequency of 400–800 THz / wavelength of 780–375 nm) as a transmission medium. VLC is a subset of optical wireless communications technologies.

  3. Electromagnetic spectrum - Wikipedia

    en.wikipedia.org/wiki/Electromagnetic_spectrum

    Electromagnetic spectrum. The electromagnetic spectrum is the full range of electromagnetic radiation, organized by frequency or wavelength. The spectrum is divided into separate bands, with different names for the electromagnetic waves within each band. From low to high frequency these are: radio waves, microwaves, infrared, visible light ...

  4. Line-of-sight propagation - Wikipedia

    en.wikipedia.org/wiki/Line-of-sight_propagation

    Line-of-sight propagation is a characteristic of electromagnetic radiation or acoustic wave propagation which means waves can only travel in a direct visual path from the source to the receiver without obstacles. [ 1] Electromagnetic transmission includes light emissions traveling in a straight line. The rays or waves may be diffracted ...

  5. Radiation - Wikipedia

    en.wikipedia.org/wiki/Radiation

    In physics, radiation is the emission or transmission of energy in the form of waves or particles through space or a material medium. [ 1][ 2] This includes: electromagnetic radiation consists of photons, such as radio waves, microwaves, infrared, visible light, ultraviolet, x-rays, and gamma radiation (γ) particle radiation consists of ...

  6. Optical communication - Wikipedia

    en.wikipedia.org/wiki/Optical_communication

    Optical communication, also known as optical telecommunication, is communication at a distance using light to carry information. It can be performed visually or by using electronic devices . The earliest basic forms of optical communication date back several millennia, while the earliest electrical device created to do so was the photophone ...

  7. Free-space optical communication - Wikipedia

    en.wikipedia.org/wiki/Free-space_optical...

    At the top right corner is a monocular for assisting the alignment of the two heads. 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.

  8. Optical wireless communications - Wikipedia

    en.wikipedia.org/.../Optical_Wireless_Communications

    Optical wireless communications (OWC) is a form of optical communication in which unguided visible, infrared (IR), or ultraviolet (UV) light is used to carry a signal. It is generally used in short-range communication. OWC systems operating in the visible band (390–750 nm) are commonly referred to as visible light communication (VLC).

  9. Cosmic ray - Wikipedia

    en.wikipedia.org/wiki/Cosmic_ray

    Cosmic rays or astroparticles are high-energy particles or clusters of particles (primarily represented by protons or atomic nuclei) that move through space at nearly the speed of light. They originate from the Sun, from outside of the Solar System in our own galaxy, [1] and from distant galaxies. [2]

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