Abstract
Variation of refractive index, extinction index, and material dispersion of a sodiumborosilicate glass with wavelength has been studied between 800 and 1800 nm from attenuation data obtained for samples of different thicknesses. Both the refractive index and the extinction index curves show that the OH stretching vibrational overtone near 1410 nm gives rise to Sellmeier-type oscillation (anomalous dispersion) superposed on the normal dispersion curve for the glass. The estimated normal dispersion curve of the glass obtained by drawing the base line through the impurity oscillations fits well into a single oscillator Sellmeier equation. The oscillator and the dispersion energy parameters were obtained by extrapolating the (n2−1)−1 vs λ−2 straight line. The material contribution to the time delay dispersion for signal propagation was estimated from these values.
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