%0 Journal Article %A S. Al-Sowayan %D 2013 %J International Journal of Electronics and Communication Engineering %B World Academy of Science, Engineering and Technology %I Open Science Index 84, 2013 %T Selective Excitation of Circular Helical Modes in Graded Index Fibers %U https://publications.waset.org/pdf/9996870 %V 84 %X The impact of selective excitation of circular helical modes of graded-index fibers on its capacity is analyzed using a model for propagation delay variation with launch offset and angle that resulted from misalignment of source and fiber axis. Results show promising technique to improve graded-index fiber capacities. %P 1711 - 1713