Method for Accurate Gain Calculation of a Highly ^/^-Codoped Waveguide Amplifier in Migration-Assisted Upconversion Regime

• Published in: IEEE journal of quantum electronics Vol. 47; no. 8; pp. 1151 - 1158
• Main Author: Valles, J. A.
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.08.2011; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Energy exchange; Erbium; Glass; interatomic energy-transfer interactions; Ions; Optical fiber amplifiers; waveguide amplifiers; {\rm Yb}^{3+}/{\rm Er}^{3+} doped glasses
• ISSN: 0018-9197; 1558-1713
• DOI: 10.1109/JQE.2011.2159961

The performance of a highly Yb 3+ /Er 3+ -codoped phosphate glass femtosecond-laser written waveguide amplifier is numerically analyzed using a macroscopic rate-equation propagation model where concentration-dependent rates for the interatomic migration-assisted energy-transfer mechanisms are considered. The Er 3+ -upconversion rate is obtained by a rigorous microscopic statistical modeling of the migration-assisted homogeneous upconversion, and the concentration dependence of the experimental Yb 3+ -sensitization rate utilized reflects the presence of migration among the Yb 3+ ions. The results of the amplifier gain dependence on the dopant concentrations illustrate the influence of migration and the need of a careful modeling of interatomic energy-transfer mechanisms for high-concentration rare-earth-doped fiber or waveguide active devices.