The Beam propagation method (BPM) is one of the most power techniques to investigate axially varying waveguides. The single mode optical Y-junction consisting of single mode channel waveguide is a fundamental component for dividing/combining guided light. Beam splitter /combiner sections are a basic element of many optical fiber communication systems often providing a Y-junction by which signals from separate sources can be combined or the received power divided between two channels. Beam propagation methods are used to obtain guided wave characteristics include power loss due to different branching angle. The input field is applied to the branching waveguide and combined after propagating through some distance. The output field is compared with respect to input field for the case of various branching angles. It is expected to high power loss due to wide branching angle. Beam propagation method has been used to estimate the power loss.
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