modal dispersion

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• Modal dispersion — is a distortion mechanism occurring in multimode fibers and other waveguides, in which the signal is spread in time because the propagation velocity of the optical signal is not the same for all modes. Other names for this phenomenon include… …   Wikipedia

• Dispersion — may refer to: In physics: The dependence of wave velocity on frequency or wavelength: Dispersion (optics), for light waves Dispersion (water waves) Acoustic dispersion, for sound waves Dispersion relation, the mathematical description of… …   Wikipedia

• Dispersion (optics) — This article is about dispersion of waves in optics. For other forms of dispersion, see Dispersion (disambiguation). In a prism, material dispersion (a wavelength dependent refractive index) causes different colors to refract at different angles …   Wikipedia

• Polarization mode dispersion — (PMD) is a form of modal dispersion where two different polarizations of light in a waveguide, which normally travel at the same speed, travel at different speeds due to random imperfections and asymmetries, causing random spreading of optical… …   Wikipedia

• Roadway air dispersion modeling — is the study of air pollutant transport from a roadway or other linear emitter. Computer models are required to conduct this analysis, because of the complex variables involved, including vehicle emissions, vehicle speed, meteorology, and terrain …   Wikipedia

• Multi-mode optical fiber — A 1.25 Gbit/s multi mode fiber Multi mode optical fiber (multimode fiber or MM fiber or fibre) is a type of optical fiber mostly used for communication over short distances, such as within a building or on a campus. Typical multimode links… …   Wikipedia

• Single-mode optical fiber — In fiber optic communication, a single mode optical fiber (SMF) is an optical fiber designed to carry only a single ray of light (mode). This ray of light often contains a variety of different wavelengths. Although the ray travels parallel to the …   Wikipedia

• Graded-index fiber — In fiber optics, a graded index or gradient index fiber is an optical fiber whose core has a refractive index that decreases with increasing radial distance from the fiber axis (the imaginary central axis running down the length of the… …   Wikipedia

• cladding —    The transparent material, usually glass, that surrounds the core of an optical fiber. Cladding has a lower refractive index than the core and so prevents the light signal from spreading out due to modal dispersion, by reflecting the signal… …   Dictionary of networking

• Gradient-index optics — is the branch of optics covering optical effects produced by a gradual variation of the refractive index of a material. An example of gradient index optics is the common mirage of a pool of water appearing on a road on a hot day. The pool is… …   Wikipedia

• multimode fiber —    A fiber optic cable with a wide core that provides multiple routes for light waves to travel. Its wider diameter of between 25 to 200 microns prevents multimode fiber from carrying signals as far as single mode fiber due to modal dispersion.… …   Dictionary of networking