Electro-optic modulator

2013-08-22T16:27:36Z

206.83.48.8: Added clarifying language and improved the logical flow of the introduction.

In [[telecommunication]], an '''equivalent noise resistance''' is a quantitative representation in resistance units of the [[spectral density]] of a [[noise]]-[[voltage]] generator, given by
<math>R_n = \frac {\pi W_n}{k T_0} </math>
where <math>W_n</math> is the spectral density, <math>k</math> is the [[Boltzmann's constant]], <math>T_0</math> is the standard [[noise temperature]] (290 K), so <math>kT_0 = 4.00 \times 10^{-21}\,[Ws]</math>.

''Note:'' The equivalent noise resistance in terms of the mean-square noise-generator voltage, ''e''<sup>2</sup>, within a [[frequency]] increment, Δ ''f'', is given by

: <math>R_n = \frac{e^2}{4 k T_0\,\Delta f}.</math>

{{FS1037C}}

== See also ==
* [[Equivalent input noise]]
* [[Effective input noise temperature]]

[[Category:Noise]]

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Electro-optic modulator