Abstract
It has been shown that the fundamental mode spot size governs the splice loss1 and the microbending loss2 of single-mode fibers. Matsumura also showed3 that the equivalent step-index fiber has approximately the same transmission characteristics (bending loss, propagation constant, provided the actual Index profile Is not too far from a step). Thus a very simple measurement of the mode spot size is of primary importance. We report a simple method, requiring only a variable aperture camera lens added to the attenuation measurement apparatus and no further fiber handling: the variable aperture lens (VAL) method.
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