Comparison of Sensitivity in Single and Dual Waveguide Coupled Microring Resonator Sensors

The single and dual waveguide coupled microring resonator sensors are presented. The sensitivity of each structure based on intensity variation and homogeneous mechanism is derived analytically which is a function of geometric and waveguide parameters. It is demonstrated that each of two structures has a optimal half single-pass phase shift so that in this phase shift, the maximum sensitivity of two devices is achieved. Then the maximum sensitivities are compared. Finally, it is shown the dual waveguide can present the higher sensitivity in a (a) determinable range of its parameters.