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Proceedings Paper

Wideband critically-coupled resonators
Author(s): C. Arlotti; A. Monmayrant; O. Gauthier-Lafaye; N. Gutierrez; A. Fernandez; O. Llopis; S. Calvez
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Paper Abstract

Over the last two decades, integrated whispering-gallery-mode resonators have been increasingly used as the basic building blocks for selective filters, high-sensitivity sensors, and as nonlinear converters. In the latter two cases, optimum performance is achieved when the intra-cavity power or the resonance feature contrast are maximum. For devices with transversely singlemode resonator and access waveguides, the above-mentioned conditions are obtained when the system is critically coupled i.e. when the coupler power transfer rate corresponds to the single-pass intra-cavity loss. Designing coupled resonators for which critical-coupling is maintained over a large spectral range is therefore attractive to facilitate sensing or nonlinear frequency conversion.

In this paper, we theoretically show, using a generic model based on the universal description of the device spectral characteristics and a coupled-mode theory treatment of the coupling section, that access-waveguide-coupled resonators can exhibit a wideband critical-coupling bandwidth when their constitutive resonator and access waveguides are different i.e. when they are phase-mismatched. To illustrate this, we have calculated the spectral response of Si3N4/SiO2 racetrack resonators and have found that, when the coupler beat-length becomes achromatic, the device critical-coupling bandwidth is expanded by more one order of magnitude compared to their phase-matched counterpart.

Paper Details

Date Published: 16 February 2018
PDF: 7 pages
Proc. SPIE 10518, Laser Resonators, Microresonators, and Beam Control XX, 105180I (16 February 2018); doi: 10.1117/12.2289577
Show Author Affiliations
C. Arlotti, Lab. d'Analyse et d'Architecture des Systèmes, CNRS (France)
A. Monmayrant, Lab. d'Analyse et d'Architecture des Systèmes, CNRS (France)
O. Gauthier-Lafaye, Lab. d'Analyse et d'Architecture des Systèmes, CNRS (France)
N. Gutierrez, Lab. d'Analyse et d'Architecture des Systèmes, CNRS (France)
A. Fernandez, Lab. d'Analyse et d'Architecture des Systèmes, CNRS (France)
O. Llopis, Lab. d'Analyse et d'Architecture des Systèmes, CNRS (France)
S. Calvez, Lab. d'Analyse et d'Architecture des Systèmes, CNRS (France)


Published in SPIE Proceedings Vol. 10518:
Laser Resonators, Microresonators, and Beam Control XX
Alexis V. Kudryashov; Alan H. Paxton; Vladimir S. Ilchenko, Editor(s)

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