17 May 2018 Temperature dependence of spectral characteristics of distributed feedback resonators
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The spectral response of a distributed-feedback resonator with a thermal chirp is investigated. An Al2O3 channel waveguide with a surface Bragg grating inscribed into its SiO2 top cladding is studied. A linear temperature gradient along the resonator leads to a corresponding variation of the grating period. We characterize its spectral response with respect to wavelength and linewidth changes of the resonance peak. Simulated results show good agreement with the experimental data, indicating that the resonance wavelength is determined by the total accumulated phase shift. The calculated grating reflectivities at the resonance wavelength largely explain the observed changes of the resonance linewidth. This agreement demonstrates that the linewidth increase is caused by the increase of resonator outcoupling losses.
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C. C. Kores, C. C. Kores, N. Ismail, N. Ismail, D. Geskus, D. Geskus, M. Dijkstra, M. Dijkstra, E. H. Bernhardi, E. H. Bernhardi, M. Pollnau, M. Pollnau, "Temperature dependence of spectral characteristics of distributed feedback resonators", Proc. SPIE 10683, Fiber Lasers and Glass Photonics: Materials through Applications, 106830B (17 May 2018); doi: 10.1117/12.2307023; https://doi.org/10.1117/12.2307023

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