  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.
