A novel proposal for optical decoder switch based on photonic crystal ring resonators

In this paper an all optical decoder switch has been proposed and designed. The proposed structure has three input ports-one for bias signal and two for control signals- and four output ports. By using the control signals we choose the optical bias signal travels toward the desired output port. For realizing the mentioned structure, we created five resonant rings inside a square matrix of rod type photonic crystal. All the resonators were designed such that their resonant wavelength was at 1550 nm. By increasing the optical intensity inside the waveguides adjacent to the resonators we shifted the resonant wavelength from 1550 nm and achieved the desired switching function for any of the resonators. Comparing the results with the truth table of an 2-to-4 logic decoder confirms that the proposed structure has the ability to work as an optical decoder.