Fig. 2: The characterization of chaotic combs.
From: Harnessing microcomb-based parallel chaos for random number generation and optical decision making
a The optical spectrum of the generated chaotic comb. b Setup for characterizing the chaotic comb. ECL external cavity diode laser, EDFA erbium-doped fiber amplifier, NF notch filter, WSS wavelength selective switch, PD photodetector, OSC oscilloscope, ESA electrical spectrum analyzer, OSA optical spectrum analyzer. c Radio frequency noise spectrum of chaotic combs pumped by different power levels. The gray line shows the spectra without optical input. d The time serial of a single comb line recorded by the oscilloscope. e The amplitude distribution of the time serial shown in (d). f The autocorrelation function (ACF) for all comb lines in C band. g The full width at half maximum (FWHM) of the ACF for different comb lines varies with the detuning of the pump laser. h The correlation between different comb lines. i The cross-correlation between symmetric comb lines in experiment (red line) and simulation (blue line).
