Abstract
Step-index single-mode optical fibers were tapered and then cleaved by ion beam milling to allow direct examination of the mode evolution in the taper with a microscope objective and CCD camera. Observation of HE/sub 1m/ modes is reported in tapered fibers cleaved at diameters ranging from 8 to 35 /spl mu/m. Theoretical scalar mode fields are fit to the experimental data and the mode transitions are explained by considering coupled mode theory.
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