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Copropagating pump and probe experiments on Si-nc in SiO2 rib waveguides doped with Er: The optical role of non-emitting ions Navarro Urrios, Daniel Ferrarese Lupi, Federico Prtljaga, Nikola Pitanti, Alessandro Jambois, Olivier Ramírez Ramírez, Joan Manel Berencén Ramírez, Yonder Antonio Daldosso, Nicola Garrido Fernández, Blas Pavesi, Lorenzo Fotònica Òptica integrada Photonics Integrated optics We present a study that demonstrates the limits for achieving net optical gain in an optimized waveguide where Si nanoclusters in SiO2 codoped with Er3+ are the active material. By cross correlating absorption losses measurements with copropagant pump (λpump = 1.48 µm) and probe (λprobe = 1.54 µm) experiments we reveal that the role of more than 80% of the total Er3+ population present on the material (intended for optical amplification purposes) is to absorb the propagating light, since it is unfeasible to invert it. 2012-04-23T10:34:29Z 2012-04-23T10:34:29Z 2011 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Reproducció del document publicat a: http://dx.doi.org/10.1063/1.3665950 Applied Physics Letters, 2011, vol. 99, núm. 23, 231114 http://dx.doi.org/10.1063/1.3665950 info:eu-repo/grantAgreement/EC/FP7/224312/EU//HELIOS (c) American Institute of Physics, 2011 info:eu-repo/semantics/openAccess American Institute of Physics Articles publicats en revistes (Enginyeria Electrònica i Biomèdica)