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This letter reports on an Echelle grating demultiplexer for dense wavelength-division-multiplexing applications with 16 channels and 100 GHz channel spacing. The Echelle grating is designed and fabricated on a silicon-on-insulator platform with a silicon guiding layer of 300 nm. The measured insertion losses of the Echelle grating are lower than 2 dB for all channels and the crosstalk is below 15...