Mode Field Diameter Calculator

Mode Field Diameter Calculator calculator can be used to calculate the mode field diameter of a fiber optic cable based on its core diameter and numerical aperture.

Input Parameters

Calculation Results

Calculation Formula

Mode Field Diameter (MFD) = 2.405 * sqrt((2 * coreDiameter / π) / (2 * NA - NA^2))

Where:
MFD = Mode Field Diameter
coreDiameter = Core Diameter of the fiber
NA = Numerical Aperture of the fiber

Mode Field Diameter Calculator Calculator Usage Guide

Learn how to use the Mode Field Diameter Calculator calculator and its working principles

How to Use the Calculator

  1. Enter the core diameter of the fiber optic cable in micrometers (µm).
  2. Enter the numerical aperture (NA) of the fiber optic cable.
  3. Click the "Calculate" button to compute the mode field diameter.
  4. The mode field diameter will be displayed in micrometers (µm).

Working Principle

The mode field diameter (MFD) is a critical parameter in fiber optics that describes the size of the area where the light is most likely to be found. It is related to the core diameter and the numerical aperture of the fiber. The formula used in this calculator is derived from the V-number (mode volume) of the fiber and is commonly used for single-mode fibers.