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In telecommunication, a mode field diameter (MFD) is 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.

Source: from Federal Standard 1037C

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