https://wiki.sarg.dev/index.php?action=history&feed=atom&title=Spectral_widthSpectral width - Revision history2026-04-22T17:43:49ZRevision history for this page on the wikiMediaWiki 1.44.2https://wiki.sarg.dev/index.php?title=Spectral_width&diff=27797&oldid=previmported>Kvng: more specific link2024-09-16T00:27:59Z<p>more specific link</p>
<p><b>New page</b></p><div>{{Short description|Measurement in communication theory}}<br />
{{Refimprove|date=January 2009}}<br />
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In [[telecommunications]], '''spectral width''' is the width of a [[spectral band]], i.e., the range of wavelengths or frequencies over which the magnitude of all [[spectral component]]s is significant, i.e., equal to or greater than a specified fraction of the largest magnitude.<br />
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In [[fiber-optic communication]] applications, the usual method of specifying spectral width is the ''[[full width at half maximum]]'' (FWHM). This is the same convention used in [[Bandwidth (signal processing)|bandwidth]], defined as the frequency range where power drops by less than half (at most &minus;3 [[Decibel|dB]]).<br />
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The FWHM method may be difficult to apply when the spectrum has a complex shape. Another method of specifying spectral width is a special case of [[Root mean square|root-mean-square deviation]] where the independent variable is wavelength, λ, and ''f'' (λ) is a suitable radiometric quantity.<br />
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The ''relative spectral width'', Δλ/λ, is frequently used where Δλ is obtained according to note 1, and λ is the center wavelength.<br />
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==See also==<br />
*[[Spectral linewidth]] in [[optics]]<br />
*[[Spectral bandwidth]]<br />
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==References==<br />
<references/><br />
*{{FS1037C MS188}}<br />
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[[Category:Telecommunication theory]]<br />
[[Category:Optical communications]]<br />
[[Category:Optical quantities]]<br />
[[Category:Spectrum (physical sciences)]]<br />
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{{telecomm-stub}}</div>imported>Kvng