L.A Bakhtiar - Arak branch, Islamic Azad University, Arak, Iran
E Yaghoubi - Science and Research branch, Islamic Azad University, Tehran, Iran
A Adami - Laser and Plasma Research institute, Shahid Beheshti University, G. C. Tehran, Iran
S.M Hamidi - Science and Research branch, Islamic Azad University, Tehran, Iran

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.

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