Implementation of photonic crystal based all-optical half adder using T-shaped waveguides

All-optical photonic crystal based half adder is proposed using T-shaped waveguides with out of phase inputs. T-shaped waveguides at the input section act as light beam splitters to provide input to the T-shaped waveguides at the output section which acts as power combiners according to the input phase. A separate 180° phase shifter is designed and used at the output section of carry to provide in phase inputs. The proposed structure is resulted with the contrast ratio of 10.95 dB and 4.32 dB at sum and carry outputs, at a bit rate above 1 Tbps.