The Design of half-subtractor Logic Function Based on Nonlinear Directional Coupler

In this paper a novel design of all-optical half-subtractor based on nonlineardirectional coupler is proposed. By using four waveguides and appropriatelyadjusting the refractive indices and selecting the proper length of waveguides, halfsubtractorfunction can be obtained. The operation of this function is simulated byRSoft CAD-Layout (BeamPROP) simulator. The simulation results confirm the allopticalhalf-subtractor circuit without any optoelectronic conversions.

Keywords:

all-optical half subtractor , coupling , nonlinear directional coupler , refractive index , waveguide