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June 23, 2014 at 4:45 pm #12123
The Beam Propagation Method (BPM) is a single wavelength formulation of light propagation. It is also a linear theory. Since it is linear, you can determine what happens to light of many wavelengths by running the simulation once for each wavelength. That approach is used to analyse the behaviour of wavelength selective devices like Mach-Zehnder interferometer or arrayed waveguide gratings.