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(a) Cutoff analysis for 600 nm height waveguide. (b) Effective area analysis as function of the width variation in a single mode section waveguide at the single channel modal interferometer with 600 nm height, working at 1550 nm wavelength. Analysis of the percentage of energy coupled in the second order mode as function of the width variation in a (c) single mode section and in the (d) multimode section, at the same wavelength.
