Abstract

Extruded polycrystalline KRS-5 fiber exhibits a large amount of residual strain. This strain, which results from the large forces applied in the extrusion process, is a major contribution to the total attenuation. To study the effect of strain on fiber loss, we have measured the total attenuation coefficient α_T and the attenuation coefficient due to scattering, α_S, as a function of stress applied along the fiber axis. The applied stress σ induces a change in the refractive index, which in turn leads to bulk scattering and excess fiber loss. We have found that α_T ∼ σ², which is in accord with an extension of a recent theory by Harrington and Sparks.

© 1983 Optical Society of America

Inverse-square wavelength dependence of attenuation in infrared polycrystalline fibers

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