Reduced back reflection design for an etched diffraction grating based planar demultiplexer

Abstract

A design for a planar etched diffraction grating (EDG) demultiplexer is presented to reduce the back reflection. By reducing the diffracted field at the input waveguide, the present design makes the best effort to reduce the optical return loss. A design example is given to verify the performance. The spectral response at the input waveguide is simulated and the results show that at the wavelengths that cause back reflection, the reduced back reflection design only receives −47.7 dB of the input power, whereas the design without reduced back reflection receives −3.7 dB of the input power.