AUTHOR=Wang Zifu , Luo Liyang , Xia Di , Lu Siqi , Lin Guosheng , Gao Shecheng , Li Zhaohui , Zhang Bin TITLE=Engineered octave frequency comb in integrated chalcogenide dual-ring microresonators JOURNAL=Frontiers in Photonics VOLUME=4 YEAR=2023 URL=https://www.frontiersin.org/journals/photonics/articles/10.3389/fphot.2023.1066993 DOI=10.3389/fphot.2023.1066993 ISSN=2673-6853 ABSTRACT=

Octave-spanning Kerr combs bridging the spectral windows of the near-infrared region (NIR) and the mid-infrared (MIR) region are expected in a number of applications, including high-capacity coherent optical communications, and gas molecular absorption footprints. Here, we propose novel concentric dual-ring microresonators (DRMs) for advanced dispersion engineering to tailor the comb spectral profile. The dispersion can be flexibly engineered not only by the cross-section of the DRMs, but also by the gap between concentric dual-ring microresonators, which provides a new path to geometrically control the spectral profile of the soliton Kerr combs. An octave-spanning Kerr soliton microcomb with multi-dispersive waves has been achieved numerically covering from the telecommunication band (1224 nm) to the mid-infrared band region (2913 nm) with a −40 dB bandwidth of 1265 nm. Our results are promising to fully understand the nonlinear dynamics in hybrid modes in DRMs, which helps control broadband comb formation.