The main goal of this study is to design, analyze, and simulate a novel ultra-fast \(1\times2\) photonic decoder. The device is composed of two-dimensional (2D) photonic crystals (PC) where silicon rods are placed in air. It includes two beam splitters and a phase shifter, which are implemented using point defects. Additionally, line defects are integrated into the device to steer the light wave without causing dissipation. The simulation yielded 0.09 ps delay time, reaching steady-state time of 0.66 ps, transmission of 0.85%, and contrast ratio of 4.13 dB. The simulation was performed using 2D finite difference time domain and plane wave expansion methods. The findings suggest that this device holds great potential as a candidate for all-optical digital integrated circuits.
