Bandwidth (signal processing) - Wikipedia
https://en.wikipedia.org/wiki/Bandwidth_(signal_processing)
Summaryx dB bandwidthOverviewRelative bandwidthPhotonicsSee alsoIn some contexts, the signal bandwidth in hertz refers to the frequency range in which the signal's spectral density (in W/Hz or V /Hz) is nonzero or above a small threshold value. The threshold value is often defined relative to the maximum value, and is most commonly the 3 dB point, that is the point where the spectral density is half its maximum value (or the spectral amplitude, in or , is 70.7% of i…
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