Temperature dependence of spectral characteristics of distributed feedback resonators

C. C. Kores, N. Ismail, D. Geskus, M. Dijkstra, E. H. Bernhardi, M. Pollnau

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The spectral response of a distributed-feedback resonator with a thermal chirp is investigated. An Al 2 O 3 channel waveguide with a surface Bragg grating inscribed into its SiO 2 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.

Original languageEnglish
Title of host publicationFiber Lasers and Glass Photonics
Subtitle of host publicationMaterials through Applications
EditorsStefano Taccheo, Jacob I. Mackenzie, Maurizio Ferrari
PublisherSPIE Press
ISBN (Electronic)9781510618923
Publication statusPublished - 2018
EventSPIE Photonics Europe 2018 - Strasbourg, France
Duration: 28 Jun 2018 → …
Conference number: 10683

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


ConferenceSPIE Photonics Europe 2018
Period28/06/18 → …


  • Bragg grating
  • Distributed-feedback laser
  • Resonance linewidth
  • Resonance wavelength
  • Thermal grating chirp


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