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In this paper, a 2-bit all-optical digital-to-analog converter, including two ring resonators has been presented. Some nonlinear rods have been placed at the center of the rings which their refractive indices depend on the incoming optical intensity. Concerning the states of two input bits, each ring does the switching operation and guides the optical waves toward the output port. The finite difference time domain method has been used to calculate the electric and magnetic components of optical waves. The maximum absolute error of the digital-to-analog converter is equal to 2.43 %, less than the previous works. Also, the insertion loss varies from −11.13 dB to −8.57 dB for the different states. Besides, the maximum propagation time of the structure is just 1.8 ps suitable for high-speed applications.

High-speed all-optical digital-to-analog converter based on photonic crystal ring resonators