Group delay dispersion
The group delay dispersion (GDD) of an optical element is the derivative of the group delay with respect to angular frequency, and also the second derivative of the optical phase. . It is a measure of the chromatic dispersion of the element. A parameter independent of the length of the material is the group velocity dispersion (GVD).
GDD is related to the total dispersion parameter as
|This optics-related article is a stub. You can help Wikipedia by expanding it.|