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Sidelobe suppression design of etched diffraction grating demultiplexers using optimized air trenches in front of each output waveguide

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Abstract

An etched diffraction grating (EDG) demultiplexer with high sidelobe suppression is designed. Sidelobes resulting from two adjacent wavelengths are suppressed by etching two optimized rectangular air trenches in front of each output waveguide that can induce large resonance loss in the adjacent wavelength but have little influence on the operational wavelength. The designed EDG demultiplexer can suppress crosstalk to less than 50dB in theory.

© 2006 Optical Society of America

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