Realization of All Optical Decoder Based on Photonic crystals Using Nonlinear Resonant Cavities

All optical decoders play a key role in the design and implementation of all optical processing systems. Switching speed, power and structural dimensions are the most important parameters that should be considered in the design of all optical devices. In this research, by using two nonlinear resonance cavities based on photonic crystals, a structure for design and implementing an all optical decoder is presented. Nonlinear resonance cavities are created by adding nonlinear rods made of contaminated glass inside the cavity. The proposed structure has one activation port, one input port and two output ports. If the activator port is off, both outputs will be off regardless of the status of the input port situation. In design of this structure, we need an activator input port and a control input. The activator input port is connected directly to the main waveguide using a side waveguide. The control input of the decoder, which is the same as the main input port of the decoder 1 to 2, is connected to the main waveguide by means of an optical power divider. Also to improve the efficiency of the light transmission from the activator port to the main waveguide, two point defects with a radius of 60 nm have been installed at the junction of the input waveguides to the main waveguide. In the designed structure, the maximum delay time is 5 ps.