doi:10.1109/JLT.2022.3185904engBenedicto, DavidValles, Juan A.Martin, Juan C.Characterization of asymmetrically Fed Er3+/Yb3+ Co-Doped double core integrated waveguidesART-2022-130159The output signal intensity distribution of several fs-laser written double-core active waveguides was registered. The ratio between cores output powers exhibited a strong dependence on the input pump power when both input pump and signal powers were directly coupled to one of the cores. A model based on the coupled-mode theory which incorporates non-identical cores and longitudinally variable signal gain coefficients was implemented. Simulations based on this model are compared to experiments. A good agreement is achievable if small differences between cores’ parameters (within the manufacturing precision limits) are allowed. IEEE2022http://zaguan.unizar.es/record/16585110.1109/JLT.2022.3185904http://zaguan.unizar.es/record/165851oai:zaguan.unizar.es:165851info:eu-repo/grantAgreement/ES/DGA/E44-20Rinfo:eu-repo/grantAgreement/ES/MICINN-AEI/PID2019-108598GB-I00/AEI/10.13039/501100011033Journal of Lightwave Technology 40, 17 (2022), 5910-5916All rights reservedhttp://www.europeana.eu/rights/rr-f/info:eu-repo/semantics/openAccess