Reflective Arrayed Waveguide Grating with Sagnac Loop Reflectors in   Silicon-on-Insulator with Gaussian Pass-band
  In this paper the experimental demonstration of a Silicon-on-Insulator Reflective Arrayed Waveguide Grating (R-AWG) is reported. The device employs one Sagnac loop mirror per arm in the array, built with a 1x2 input/outputs, 50:50 splitting ratio, Multimode Interference coupler, for total reflection. The spectral responses obtained are compared to those of regular AWGs fabricated in the same die. 
Bernardo Gargallo, Pascual Mu\~noz, Roc\'io Ba\~nos, Anna L. Giesecke,   Jens Bolten, Thorsten Wahlbrink, Herbert Kleinjans
physics.optics