doi:10.1117/12.2078657engVallés Brau, Juan AntonioGalatus, R.Requirements for gain/oscillation in Yb3+/Er3+-codoped microring resonatorsART-2015-90944A detailed model of the performance of a highly Yb3+/Er3+-codoped phosphate glass add-drop filter, which combines the propagation at resonance of both pump and signal powers inside the microring resonator with their interaction with the dopant ions, is used to analyze the requirements for gain/oscillation in these structures. Special attention is paid to the influence of additional coupling losses and asymmetry between the input/output couplers. It is concluded that, due to small signal gain saturation and the limited range of pump amplitude coupling coefficients, asymmetry does not greatly influence gain/oscillation requirements through the pump intensity build-up inside the ring. Asymmetry effect on small signal intensity transfer rate and threshold gain instead allows a significant lightening of the demanding doping ions concentrations requirements to achieve oscillation.2015http://zaguan.unizar.es/record/4657310.1117/12.2078657http://zaguan.unizar.es/record/46573oai:zaguan.unizar.es:46573info:eu-repo/grantAgreement/ES/DGA/POSDRU-89-1.5-S-52603info:eu-repo/grantAgreement/ES/MINECO/TEC2013-46643-C2-2-RProceedings of SPIE, the International Society for Optical Engineering 9359 (2015)All rights reservedhttp://www.europeana.eu/rights/rr-f/info:eu-repo/semantics/openAccess