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Achromatic critically coupled racetrack resonators

Clément Arlotti 1 Olivier Gauthier-Lafaye 1 Antoine Monmayrant 1 Stéphane Calvez 1
1 LAAS-PHOTO - Équipe Photonique
LAAS - Laboratoire d'analyse et d'architecture des systèmes
Abstract : In this paper, we investigate the spectral response of whispering-gallery-mode (WGM) resonators coupled to their access waveguide with a view to design their constitutive waveguides to promote critical-coupling over a wide spectral range and thereby facilitate their use for high-sensitivity sensing or nonlinear frequency conversion applications. The carried-out theoretical analysis is based on the universal response functions of singlemode and unidirectional devices. A coupled-mode treatment of the coupling region enables to derive two sets of favorable designs. The identified resonator/access waveguide systems exploit waveguides with mismatched propagation constants forming a coupling section exhibiting either an achromatic beat-length or an achromatic power-transfer coefficient. This generic model is followed by a numerical case study of vertically-coupled Si3N4 racetrack resonators. The conventional (quasi-)phase-matched configuration, treated as a reference case, is shown to display a critical-coupling bandwidth of 23 nm at a wavelength of 1550nm, whereas the proposed new designs demonstrate critical bandwidths larger than 330nm, i.e. exhibit bandwidths enhanced by more than one order of magnitude.
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Submitted on : Wednesday, October 18, 2017 - 9:03:53 PM
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Clément Arlotti, Olivier Gauthier-Lafaye, Antoine Monmayrant, Stéphane Calvez. Achromatic critically coupled racetrack resonators. Journal of the Optical Society of America B, Optical Society of America, 2017, 34 (11), pp.2343-2351. ⟨10.1364/JOSAB.34.002343⟩. ⟨hal-01619015⟩