ATIS Telecom Glossary
Thursday, August 28, 2014

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mode field diameter (MFD)
An expression of distribution of the irradiance, i.e., the optical power, across the end face of a single-mode fiber. Note: For a Gaussian power distribution in a single-mode optical fiber, the mode field diameter is that at which the electric and magnetic field strengths are reduced to 1/e of their maximum values, i.e., the diameter at which power is reduced to 1/e2 of the maximum power, because the power is proportional to the square of the field strength.

 

 

 

 

 

 

 

 

 

 



 
These definitions were prepared by ATIS Committee PRQC
 
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