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Measurement of noise contribution of an amplifier relative to a noise-free amplifier at a reference temperature.

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Posted by waqasahmad

For details:

en.wikipedia.org/wiki/Noise_figure

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Posted by sagitraz

Noise figure is the ratio of optical signal to noise ratio to the i/p signal to noise ratio also it is a measure of degradation of signal to noise ratio.

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Posted by HamidAliKhan

its a measure of degradation of signal to noise ratio

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Posted by Hash007

It is the ratio of o/p signal to noise ratio to the i/p signal to noise ratio.

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Posted by mitchel