Abstract
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 × 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">26</sup> m <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-3</sup> ) 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.
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