Skip to Main content Skip to Navigation
Journal articles

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.
Complete list of metadata

Cited literature [13 references]  Display  Hide  Download
Contributor : Stéphane Calvez <>
Submitted on : Wednesday, October 18, 2017 - 9:03:53 PM
Last modification on : Thursday, June 10, 2021 - 3:03:15 AM
Long-term archiving on: : Friday, January 19, 2018 - 2:23:52 PM


Files produced by the author(s)



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⟩



Record views


Files downloads