Abstract

A technique is presented that uses total-loss data from a conventional monochromator-based spectral-loss measurement set to obtain not only the Rayleigh and wavelength-independent scattering of a fiber but also the UV-band-edge absorption. That absorption causes the total-loss data to deviate significantly from a straight line when the data are plotted vs λ on a 1/λ4 scale. Including the absorption term accounts for the deviation from a straight line over an extended wavelength region (0.66–1.16 μm) and materially affects the A and B coefficients obtained. For one fiber examined in detail A went from 1.30 to 1.13 μm4 dB/km and B from 0.22 to 0.32 dB/km when the UV absorption was included. This technique also eliminates the problem of negative B coefficients and allows processing variables that affect absorption to be separated from those that affect scattering.

© 1982 Optical Society of America

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