Abstract

A new, highly precise, optical fiber outer diameter measuring technique based on near-field resonant backscattered light is described. Relative accuracies of ±10−2μm were achieved in diameter measurements using Fabry-Perot resonances and ±10−3μm in average diameter measurements using dielectric surface-wave resonances for ∼100-μm fibers. The shape of a new type of low birefringence spun fiber, made by rapidly spinning a near circular preform in the pulling oven, was measured. We observed a small ellipticity which rotated helically along the fiber. The possibility of making absolute and real-time outer diameter measurements is discussed.

© 1981 Optical Society of America

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