ATIS Telecom Glossary
Saturday, December 03, 2016
Using the ATIS Telecom Glossary
Annex A: Informative References
For an electromagnetic wave, the time over which a propagating wave may be considered coherent.
In long-distance transmission systems, the coherence time may be reduced by propagation factors such as dispersion, scattering, and diffraction.
In optical communications, coherence time,
, is calculated by dividing the coherence length by the phase velocity of light in a medium; approximately given by
is the central wavelength of the source,
is the spectral width of the source, and c is the velocity of light in vacuum.
" is usually applied to the optical regime.
These definitions were prepared by
ATIS Committee PRQC
For more information on the work related to these definitions,
please visit the
and the ATIS