JELE_V2_N2_RP6 S. K. Raghuwanshi Santosh Kumar Journal on Electronics Engineering 2249 – 0760 2 2 43 48 Taper Optical Waveguide, Computational Electromagnetic, Formal Electromagnetic Concepts We study the thin taper optical waveguide structure by using the step discontinuity model. The technique presented is unique and not being discussed elsewhere. We also study the power loss due to step discontinuity effect for the case of an asymmetric single mode planar slab taper waveguide structure. The only assumption, we consider is that there are no reflection of fields at the step discontinuity point. In this paper we also assume that there are no mode conversions due to discontinuity effect and the structure maintain the single mode operation even at the step discontinuity point. We deliberately considered the thin taper structure to be valid on single mode operation. The technique presented can be easily extended to more complicated waveguide structure like ridge waveguide structure. December 2011 - February 2012 Copyright © 2012 i-manager publications. All rights reserved. i-manager Publications http://www.imanagerpublications.com/Article.aspx?ArticleId=1626