Fig. 2: Generation of the parallel chaos by chaotic microcombs.

a, Optical micrograph of the AlGaAsOI chip for ring resonators with a free spectral range of 90 GHz. b, The optical spectrum of the generated chaotic comb with the on-chip pump power of ~130 mW. The pump, marked by the red arrow, is suppressed by a fibre Bragg grating (FBG). The blue shading indicates comb lines in the C band. c–e, The temporal waveform (c), the autocorrelation function (d) and the radio frequency spectrum (e) of the first comb line in the C band marked by the blue arrow in b with μ denoting the label of the comb line. The inset in d is the magnified autocorrelation function. f, The simulated range resolution for different integrated nonlinear platforms with different pump powers, see Methods for more details. g, Experimentally estimated range resolutions of 51 comb lines in the C band under different detuning. The dark blue region for channel numbers around 32 indicates comb lines suppressed by the FBG.