Abstract
I use the direct far-field method to measure the mode-field
diameter of a single-mode fiber with an expanded uncertainty of 30 nm,
with a coverage factor of 2. For a step-index fiber with a
mode-field diameter of approximately 9 μm, the major sources
of uncertainty are nonlinearity in the electronics, angular errors and
scattered light in the apparatus, and the polarization and
noncircularity of the mode of the fiber. The paper concludes by
showing an inconsistency in the derivation of the far-field expression
for mode-field diameter.
© 1998 Optical Society of America
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