Lossless 1x2 optical switch monolithically integrated on a passive active resonant coupler (PARC) platform

In this letter, we demonstrate a lossless 1 x 2 optical switch utilizing re sonant vertical coupling between an active and a passive waveguide, Optical power is coupled into the passive waveguide and split into two ports using a 3-dB Y-junction splitter. The mode is then coupled up to a 1-mm-long act ive waveguide where gain is provided. A 100-mu m-long taper is utilized in each arm for coupling the mode from the passive to the active waveguide, In ternal gain greater than 22 dB is obtained in each arm of the integrated sp litter. High yield and good uniformity of devices are obtained over multipl e processing runs.