Search the Internet with Kids.Net.Au
Encyclopedia > Coherence length
Article Content
Coherence length
In telecommunication, coherence length is the propagation distance from a coherent source to a point where an electromagnetic wave maintains a specified degree of coherence[?].
Note 1: In long-distance transmission systems, the coherence length may be reduced by propagation factors such as dispersion, scattering, and diffraction.
Note 2: In optical communications, the coherence length, L , is given approximately by L = λ2/(n Δλ), where λ is the central wavelength of the source, n is the refractive index of the medium, and Δλ is the spectral width of the source.
Note 3: Coherence length is usually applied to the optical regime.
Source: from Federal Standard 1037C and from MIL-STD-188
All Wikipedia text is available under the terms of the GNU Free Documentation License
|
Search Encyclopedia
|
Featured Article
|