By Martin H. Weik
The first version of this dictionary was once written through the years previous 1980. No fiber optics thesaurus have been released through any famous stan dards physique. No different dictionaries in fiber optics have been released. an important record of fiber optics phrases and definitions, NBS instruction manual one hundred forty, Optical Waveguide Communications thesaurus, used to be issued in 1982 via the nationwide Bureau of criteria, now the nationwide Institute of criteria and know-how. because then numerous guides via criteria our bodies contained fiber optics phrases and definitions. In 1984 the Institute of electric and digital Engineers released IEEE general 812-1984, Definitions of phrases when it comes to Fiber Optics. In 1986 the nationwide verbal exchange Sys tem released Federal regular FED-STD-I037A, thesaurus of Telecom munication phrases, containing approximately a hundred fiber optics phrases and definitions. In 1988 the digital Industries organization issued EIA-440A, Fiber Optic Terminology. All of those works have been in accordance with NBS guide one hundred forty com piled 10 years previous. presently the foreign Electrotechnical fee is getting ready IEC Draft 731, Optical Communications, phrases and Definitions. paintings in fiber optics terminology is being reflected within the foreign association for Standardization and the foreign Telecommunications Union. None of those works constitutes a entire insurance of the sector of fiber optics. each one used to be ready through specialist humans representing particular in terest teams. each one paintings used to be geared toward particular audiences: study activi ties, improvement actions, brands, scientists, engineers, and so forth. Their content material is dedicated essentially to basic medical and technical rules and concept instead of cutting-edge and complex technology.
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Extra resources for Fiber Optics Standard Dictionary
Connector. See expanded-beam connector; fiber optic connector; fixed connector; free connector; heavy-duty connector; light-duty connector; optical waveguide connector; optical fiber active connector; receiver optical connector; transmitter optical connector; wet-mateable connector. See hybrid connector. (See Figs. C-2-C-7) connector set. See optical fiber connector set. connector variation. See optical connector variation. conservation law. See radiance conservation law. conservation of radiance law.
38042 x 10- 16 erg/K. For example, in a photoemissive photodetector, the dark current is given by the relation: where A is the surface area constant, T is the absolute temperature, q is the electron charge, w is the work function of the photoemissive surface material, and k is Boltzmann's constant; the signal-to-noise ratio for a photo detector is given by the relation: where Npl B is the number of incident photons per unit of bandwidth, h is Planck's constant, fis the frequency of the incident photons, k is Boltzmann's constant, and T is the absolute temperature; and for the noise generated by thermal agitation of electrons in a conductor, the noise power, P, in watts, is given by the relation: P = kT(~j) where k is Boltzmann's constant, T is the conductor temperature in kelvins, and is the bandwidth in hertz.
The time over which a propagating electromagnetic wave may be considered coherent. It is equal to the coherence length divided by the phase velocity of light in a propagation medium, approximately given by the relation: where An is the central wavelength, dA is the spectral line width, and c is the velocity of light in vacuum. In long-distance transmission systems, the coherence time may be degraded by other propagation factors. coherent. 1. Pertaining to a fixed phase relationship between points on an electromagnetic wave.