Temperature dependence of the spectral characteristics of distributed-feedback resonators

Cristine Calil Kores, Nur Ismail, Dimitri Geskus, Meindert Dijkstra, Edward H. Bernhardi, Markus Pollnau* (Corresponding Author)

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

10 Citations (Scopus)
141 Downloads (Pure)

Abstract

We characterize the spectral response of a distributed-feedback resonator when subject to a thermal chirp. An Al2O3 rib waveguide with a corrugated surface Bragg grating inscribed into its SiO2 top cladding is experimentally investigated. We induce a near-to-linear temperature gradient along the resonator, leading to a similar variation of the grating period, and characterize its spectral response in terms of wavelength and linewidth of the resonance peak. Simulations are carried out, showing good agreement with the experimental results and indicating that the wavelength of the resonance peak is a result only of the total accumulated phase shift. For any chirp profile we are able to calculate the reflectivities at the resonance wavelength, and this information largely explains how the linewidth of the resonance changes. This result shows that the increase in linewidth is governed by the increase of the resonator outcoupling losses.

Original languageEnglish
Pages (from-to)4892-4905
Number of pages14
JournalOptics express
Volume26
Issue number4
DOIs
Publication statusPublished - 19 Feb 2018

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