Group Delay Dispersion Calculator

Group Delay Dispersion Calculator calculator can be used to calculate the group delay dispersion of optical fibers based on material properties and wavelength.

Input Parameters

Calculation Results

Group Delay Dispersion (D)

0.00 ps/nm

Where:
D = (λ² / 2πc) * (dn/dλ)
D = Group Delay Dispersion (ps/nm)
λ = Wavelength (nm)
c = Speed of light (299792458 m/s)
dn/dλ = Refractive Index Change (1/nm)

Group Delay Dispersion Calculator Usage Guide

Learn how to use the Group Delay Dispersion Calculator calculator and its working principles

What is Group Delay Dispersion?

Group delay dispersion (GDD) is a measure of the dispersion of a medium for pulses of light with a pulse width much smaller than the coherence length of the medium. It is defined as the derivative of the group delay with respect to frequency.

How to Use This Calculator

  1. Enter the wavelength (λ) of light in nanometers (typically between 400-2000 nm for optical fibers).
  2. Enter the refractive index (n) of the material at the given wavelength.
  3. Enter the refractive index change (dn/dλ) with respect to wavelength, which can be calculated or looked up for the specific material.
  4. Click the "Calculate" button to compute the group delay dispersion.

Principle of Calculation

The group delay dispersion is calculated using the formula:

D = (λ² / 2πc) * (dn/dλ)

Where:

  • D is the group delay dispersion in ps/nm
  • λ is the wavelength in nanometers
  • c is the speed of light in meters per second (approximately 299,792,458 m/s)
  • dn/dλ is the change in refractive index with respect to wavelength in 1/nm

Applications

Group delay dispersion is an important parameter in optical communications and fiber optics, as it affects the bandwidth and pulse broadening in optical systems. It is critical for designing optical modulators, filters, and other communication components.