Highly ${\rm Yb}^{3+}/{\rm Er}^{3+}$ -Codoped Waveguide Microring Resonator Optimized Performance

The amplifying and filtering performance of a highly Yb/Er-codoped phosphate glass add-drop filter is numerically analyzed. The use of the microscopic statistical formalism to describe energy-transfer inter-atomic mechanisms allows determining realistic optimum parameters and working conditions. In order to optimize the device performance and achieve a significant signal power gain in both through and drop ports, in addition to a careful previous design, moderate input pump powers (>;50 mW) and comparatively high erbium concentrations (>;5 × 10²⁶ m^-3) are required. The optimal parameters present a strong dependence on the input pump power. This dependence confirms the necessity of considering the energy-transfer inter-atomic mechanisms for any optimization design process.