A new, highly precise, optical fiber outer diameter measuring technique based on near-field resonant backscattered light is described. Relative accuracies of ±10-2 µm were achieved in diameter measurements using Fabry-Perot resonances and ±10-3 µm 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
A. Ashkin, J. M. Dziedzic, and R. H. Stolen, "Outer diameter measurement of low birefringence optical fibers by a new resonant backscatter technique," Appl. Opt. 20, 2299-2303 (1981)