---
title: "Fiber Chromatic Dispersion calculator — AperiOptic"
description: "Pulse broadening from fiber chromatic dispersion. Free online optics calculator, with the formula and code snippets."
url: "https://aperioptic.com/calculators/fiber-chromatic-dispersion"
---

# Fiber Chromatic Dispersion calculator

Pulse broadening from fiber chromatic dispersion.

Category: [Fiber Optics](https://aperioptic.com/calculators)

Formula: `Δτ = D · Δλ · L (ps)`

## Inputs

| Input | Parameter | Unit | Default |
| --- | --- | --- | --- |
| D (ps/nm/km) | `D` |  | 17 |
| Δλ | `dlam` | nm | 1 |
| Length (km) | `L` |  | 10 |

## Result with the default inputs

- Δτ: 170 ps

Open it with your own values: put each input in the address as a parameter, for example [`/calculators/fiber-chromatic-dispersion?D=17`](https://aperioptic.com/calculators/fiber-chromatic-dispersion?D=17). A unit other than the listed one goes in `<parameter>_unit`.

Read more: [Wikipedia: Dispersion (optics)](https://en.wikipedia.org/wiki/Dispersion_(optics))

[All optics calculators](https://aperioptic.com/calculators)

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The interactive page: https://aperioptic.com/calculators/fiber-chromatic-dispersion (AperiOptic runs in the browser; free, no account). Every page of the site as Markdown: https://aperioptic.com/llms.txt