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Intrinsic Noise

In a propagation medium, a transmission path, or a device, the noise that (a) is inherent to the medium, path, or device and (b) does not result from modulation. Note: Examples of intrinsic noise are (a) optical noise caused by anomalies, such as refractive-index discontinuities, interstitial defects, and vacancy defects, in an optical fiber, (b) thermal noise in a resistor, a metallic conductor, or a semiconductor, (c)