Enter the total group velocity dispersion and the length of the medium into the calculator to determine the group delay dispersion.

Group Delay Dispersion Formula

The following equation is used to calculate the Group Delay Dispersion.

GDD = GVD * L 
  • Where GDD delay is the Group Delay Dispersion(fs^2)
  • GVD is the group velocity dispersion (fs^2/mm)
  • L is the length of the medium (mm)

To calculate the group dispersion delay, multiply the group velocity dispersion by the medium length.

What is a Group Delay Dispersion?


A group delay dispersion is defined as the frequency dependency of the group delay.

How to Calculate Group Delay Dispersion?

Example Problem:

The following example outlines the steps and information needed to calculate Group Delay Dispersion.

First, determine the group velocity dispersion. In this example, this is provided as 100 ft^2/mm.

Next, determine the medium length. The length of the medium, in this example, is measured to be 10mm.

Finally, calculate the Group Delay Dispersion using the formula above:


GDD = 100*10

GDD = 1,000 fs^2.