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I. INTRODUCTION THE accurate analysis, design and optimization of guided-wave structures are essential for the development of integrated photonic devices. Of all the methods used to simulate guided-wave propagation in these devices, the beam propagation method (BPM) has been one of the most popular approaches used in the modeling and simulation of electromagnetic wave

Beam Propagation Method Based on Fast Fourier Transform and Finite Difference Schemes and Its Application to Optical Diffraction Grating.(Dept.E)