Fig. 4: Comparison between chaos-assisted coupling combs and phase-matched coupling combs.

a Conceptual schematic: a phase-matched microfiber is used to couple pump laser into the deformed cavity and it also collects comb emissions at the through port. A nanofiber is used at the drop port to output comb light through chaos-assisted coupling. b Three-dimensional finite difference time-domain (3D FDTD) simulation of the coupling efficiencies of both phase-matched coupling and chaos-assisted coupling. c, d Optical spectra of the frequency combs with phase-matched coupling (blue) and chaos-assisted coupling (red) in infrared (c) and visible (d) regions.