Measurement for optical fiber numerical aperture A. Intensity measurement of optical far-field It is a standard method defined by ITU-T G.651 for measuring a multimode optical fiber. This method has strict requirement on processing optical fiber specimen. Advanced instruments are needed, e.g. stable non-coherent light source with adjustable intensity and light detector with a good linearity etc. B. Far-field beam spot This measurement method is theoretically similar to above far-field light intensity method. The difference lies in the result acquisition. Although it is not the standard method, it is simple since a coherent light source can be used. This method is commonly used. The schematic is shown.
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