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An optical arrayed waveguide of triangular index profile structure is analyzed using fast fourier transform-beam propagation method (FFT-BPM) that emphasis its performance for radiation and make an effort as photonic antenna for optical wireless communication. The optical waveguide of triangular index profile with metal alloy strip inserted in the centre is analyzed to form photonic antenna. The BPM is an extensively used tool for computer simulation of light propagation in optical waveguide structures, has been developed for analyzing optical waveguides with different refractive index profiles. This paper presents simulation model of multiple straight forward multibeam capability and shows comprehensive radiation alongside the accessible planar triangular structure. The consequences confirm that it is promising to curtail radiation loss under sturdy mode coupling conditions. This method can be realized for modeling of laser beam propagation in non-homogeneous atmosphere.