- 行业: Telecommunications
- Number of terms: 29235
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ATIS is the leading technical planning and standards development organization committed to the rapid development of global, market-driven standards for the information, entertainment and communications industry.
In a single-mode optical fiber, the wavelength or wavelengths at which material dispersion and waveguide dispersion cancel one another. Note: In all silica-based optical fibers, minimum material dispersion occurs naturally at a wavelength of approximately 1. 3 m. Single-mode fibers may be made of silica-based glasses containing dopants that shift the material-dispersion wavelength, and thus, the zero-dispersion wavelength, toward the minimum-loss window at approximately 1. 55 m. The engineering tradeoff is a slight increase in the minimum attenuation coefficient. 2. Loosely, in a multimode optical fiber, the wavelength at which material dispersion is minimum, i.e., essentially zero. Synonym minimum-dispersion wavelength.
Industry:Telecommunications
In a single-mode optical fiber, the rate of change of dispersion, with respect to wavelength, at the fiber's zero-dispersion wavelength. Note 1: In silica-based optical fibers, the zero-dispersion wavelength occurs at approximately 1. 3 m, but this wavelength may be shifted toward the minimum-loss window by the addition of dopants to the fiber material during manufacture. Note 2: Doubly and quadruply clad single-mode fibers have two zero-dispersion points, and thus two zero-dispersion slopes.
Industry:Telecommunications
In a single-mode optical fiber, the rate of change of dispersion, with respect to wavelength, at the fiber's zero-dispersion wavelength. Note 1: In silica-based optical fibers, the zero-dispersion wavelength occurs at approximately 1. 3 m, but this wavelength may be shifted toward the minimum-loss window by the addition of dopants to the fiber material during manufacture. Note 2: Doubly and quadruply clad single-mode fibers have two zero-dispersion points, and thus two zero-dispersion slopes.
Industry:Telecommunications
In a satellite link, one of the non-orbiting communications stations that receives, processes, and transmits signals between itself and a satellite. Note: Earth terminals may be at mobile, fixed, airborne, and waterborne Earth terminal complexes. Synonym satellite Earth terminal.
Industry:Telecommunications
In a signal, the changing from one significant condition to another. Note: Examples of transitions are the changing from one voltage level to another in a data stream, the shifting from one phase position to another in phase-shift keying, and the translation from one frequency to another in frequency-shift keying.
Industry:Telecommunications
In a signal, any instant at which a significant condition of a signal begins or ends. Note: Examples of significant instants include the instant at which a signal crosses the baseline or reaches 10% or 90% of its maximum value.
Industry:Telecommunications
In a signal message, data transmitted between the user part and the message transfer part to identify the boundaries of the signal message.
Industry:Telecommunications
In a semiconductor, the range of electron energy, higher than that of the valence band, sufficient to make the electrons free to move from atom to atom under the influence of an applied electric field and thus constitute an electric current. 2. In the atomic structure of a material, a partially filled or empty energy level in which electrons are free to move, thus allowing the material to conduct an electrical current upon application of an electric field by means of an applied voltage.
Industry:Telecommunications
In a satellite orbit, the point that is closest to the gravitational center of the system consisting of the primary body and the satellite. Note: In an orbit about the Earth, periapsis is called perigee. In an orbit about the Moon, periapsis is called perilune, and in an orbit about the Sun, it is called perihelion.
Industry:Telecommunications
In a satellite link, one of the non-orbiting communications stations that receives, processes, and transmits signals between itself and a satellite. Note: Earth terminals may be at mobile, fixed, airborne, and waterborne Earth terminal complexes. Synonym satellite Earth terminal.
Industry:Telecommunications
