Browsing by Author "Getachew Belay"

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    An Investigation of Attenuation and Dispersion in Propagation Mode Characteristics of Optical Fiber Material Leading to Non-linearity
    (Addis Ababa Universty, 2009-06) Getachew Belay; Ghoshal S.K. (PhD)
    Study of non-linearity in optical fiber material has attracted tremendous attention over last two decades. Despite of many experimental and theoretical efforts to find the origin of non-linearity and to quantify the loss due to non-linearity still a debatable issue. The aim of this research work is to find a mechanism and to quantify to non-linearity that causes attenuation and dispersion in optical fiber. We specifically calculated solution to non-linear envelope equation (non-linear Schrödinger equation) from Maxwell theory choosing appropriate envelope function. Our calculations are in agreement with other observation as far as loss and non-linearity concerned. We found the soliton solution that is a very interesting result that can be further looked at in detail to observe the non-linear effect in fiber material. It is found that the non-linearity balances dispersion and a stable pulse is formed which does not alter its shape during propagation. This simple calculation is to understand the mechanism of the origin of non-linearity how to further control it by tuning some of the fiber material.