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The group delay dispersion is the change in the group delay depending on the frequency of the propagating light. Since a pulse will generally have a spread of wavelengths, differences in the group delay for the various wavelengths will cause the pulse to broaden in time. Typical units are [ps²] and is for a defined length of optical material.

Related Terms: Group Delay Dispersion (GDD), Group Index and Velocity, Group Velocity Delay (GVD), Second Order Dispersion