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Personne :
Rivera, V. A. G

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Rivera

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V. A. G

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Université Laval. Centre d'optique, photonique et laser

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ncf11700880

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Résultats de recherche

Voici les éléments 1 - 3 sur 3
  • PublicationRestriction temporaire
    Novel insights on energy transfer processes in [Ce4+/Ce3+]-Er3+-doped tellurite glass
    (Elsevier Ltd., 2022-10-14) Carvalho Pinto, Iago; Falci, Rodrigo Ferreira; Rivera, V. A. G; Guérineau, Théo; LaRochelle, Sophie; Messaddeq, Younès
    Previous works have been already reported on multiphonon-assisted non-resonant energy transfer in Ce3+-Er3+-doped tellurite glasses. However, it is not clear the mechanism of the radiative emission of Er3+ centered at 1530 nm. In this paper, we reported a better understanding of the mechanism of interactions between those two rare-earth ions via a systematic study. For that, we will explore the energy transitions between Ce4+/Ce3+ and Er3+ ions in a tungsten-tellurite glass to both emission (in the near infrared) and upconversion (in the visible) spectrum. Here, Ce4+ and Ce3+ were obtained in an Er3+-doped tellurite glasses via the addition of different concentrations of CeO2 as part of the composition of the samples. Emission spectrum, under a 980 nm excitation, giving rise to a series of interactions between Ce3+↔Er3+ resulting in: (i) a subtle increase of the Er3+ emission intensity in the near-infrared region for 0.1 mol% of CeO2, and then a decrease in the emission for higher CeO2 concentration in both cases without any significant increase in the bandwidth, and (ii) a decrease of the visible upconversion emission intensity with the addition of CeO2. Such interactions are achieved via a coupling yielding and energy transfer from both rare-earth ions.
  • PublicationRestreint
    Baria-silica erbium-doped fibers for extended L-band amplification
    (Institute of Electrical and Electronics Engineers, 2023-02-13) Jalilpiran, Saber; Fuertes, Victor; Lefebvre, Jacques; Grégoire, Nicolas; Durak, Firat; Landry, Nelson; Wang, Lixian; Rivera, V. A. G; Messaddeq, Younès; LaRochelle, Sophie
    We present baria-silica erbium-doped fibers (BaEDF) for extending the bandwidth of L-band EDFAs beyond 1620 nm. Using a combination of modified chemical vapor deposition (MCVD) process and solution-doping technique, we demonstrate low loss (<10 dB/km at 1200 nm) fiber cores with BaO concentration of 1-3 mol% and Er3+ concentration of 8×1024 m-3 . We show that the optical properties and EDFA performance are positively affected by increasing the BaO content. Namely, when we increase the BaO concentration from 1.3 to 3 mol%, we observe a reduction of pair-induced quenching that correlates with a biexponential luminescence decay with a dominant 15.5 ms lifetime component. Furthermore, the slight modifications of absorption/ emission coefficients point to a red-shift of the signal excited state absorption and consequently, to a moderate extension of the L-band gain to longer wavelengths (1622 nm).
  • PublicationAccès libre
    The role of tungsten oxide in Er3+ -doped bismuth germanate glasses for optical amplifcation in L-band
    (Nature Publishing Group, 2023-05-31) Çamiçi, Hüseyin Can; Messaddeq, Younès; Guérineau, Théo; Rivera, V. A. G; Falci, Rodrigo Ferreira; LaRochelle, Sophie
    A series of novel Er³+-doped bismuth-germanate glasses containing diferent tungsten concentrations with a molar composition of 97.5[(75 − x)GeO₂–25Bi₂O₃–(x)WO₃]–2Sb₂O₃–0.5Er₂O₃ (x = 5, 10, 15, 20, and 25 mol%) were fabricated. Their thermal properties are measured by diferential scanning calorimetry. A structural investigation by Raman spectroscopy suggested that changes occurred in the glass network by WO3 incorporation. By laser excitation at 980 nm, a strong emission from Er³+ ions at 1532 nm is observed, while the WO₃ addition caused changes in the emission spectra. The emission cross-section spectra of Er³+ are calculated by both McCumber and Füchtbauer–Ladenburg theories and their comparison showed these theories yielded slightly diferent results, but in both cases, the calculations showed that a gain signal in L-band can be achieved when 30% of the Er³+ ions are at the excited state. This study proves that the Er³+-doped bismuth-germanate glasses are suitable for ₂optical fber amplifer applications operating at C- and L-band.