Demonstration of All-Optical NAND Logic Gate Using Photonic Integrated Circuits
A logic gate performs a certain Boolean logic operation on one or more logical inputs and produces a single logical output. The logic values are either “true” or “false.” Logic gates are bistable devices, that is, they may yield one of these two possible stable outputs. The NAND logic is a universal gate; any logic operation can be performed with various combinations of NAND logics. Many approaches have been proposed to achieve all-optical logic functions, based on the nonlinear effects either in optical fiber or in semiconductor material. In the present work we propose a novel method for an all-optical logic operation using a simple bi-directional coupler with unequal length of waveguide. The simulated results show that the logic operation is possible.
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