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Frequency and linewidth dependence of distributed-feedback resonators on thermal chirp
KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
KTH, School of Engineering Sciences (SCI), Applied Physics.
KTH, School of Engineering Sciences (SCI), Applied Physics.
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2017 (English)In: 2017 19th International Conference on Transparent Optical Networks (ICTON), IEEE Computer Society, 2017, 8025100Conference paper (Refereed)
Abstract [en]

We present an analysis of the spectral characteristics of distributed-feedback (DFB) laser resonators with thermally chirped distributed mirrors. Such DFB resonators have the interesting capability of producing a linewidth as narrow as a few kHz. The investigated devices are ytterbium-doped amorphous Al2O3 channel waveguides with a periodic Bragg grating inscribed into its SiO2 top cladding. The resonance in the spectral response of the resonator results from a distributed λ/4 phase-shift produced by increasing the waveguide width. Its frequency is determined by the period of the Bragg grating, whereas its linewidth is determined by the intrinsic losses and the outcoupling losses of the resonator. When such a device is optically pumped to achieve gain and eventually lasing, the grating period becomes thermally chirped, thereby influencing the spectral characteristics of the resonator. We investigate experimentally and via simulations the frequency and linewidth of the resonance in the presence of a thermally induced linear chirp on the grating profile. Experiments and simulations show good quantitative agreement.

Place, publisher, year, edition, pages
IEEE Computer Society, 2017. 8025100
Series
International Conference on Transparent Optical Networks, ISSN 2162-7339
Keyword [en]
chirped gratings, coupled mode theory, distributed-feedback resonators, narrow linewidth
National Category
Communication Systems
Identifiers
URN: urn:nbn:se:kth:diva-218534DOI: 10.1109/ICTON.2017.8025100Scopus ID: 2-s2.0-85031006582ISBN: 9781538608586 OAI: oai:DiVA.org:kth-218534DiVA: diva2:1161663
Conference
19th International Conference on Transparent Optical Networks, ICTON 2017, Girona, Catalonia, Spain, 2 July 2017 through 6 July 2017
Note

QC 20171130

Available from: 2017-11-30 Created: 2017-11-30 Last updated: 2017-11-30Bibliographically approved

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CiteExportLink to record
Permanent link

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Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
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  • asciidoc
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