Measurement methods and test procedures: Mode Field Diameter. This part of IEC 60793 establishes uniform requirements for measuring the Mode Field Diameter of optical fiber, thereby assisting in the inspection of fibers and cables for commercial purposes. The MFD represents a measure of the transverse extent of the electromagnetic field of intensity of the mode in cross section. It is defined from the far field intensity distribution as a ratio of integrals known as the Petermann ll definition.

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