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?

Definition:

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 = GVD * L

GDD = 100*10

GDD = 1,000 fs^2.