Fig. 1. Schematics of generation of millimeter-wave noise. (a) Optical mixing of two Gaussian noise spectra; (b) optical mixing of multiple Gaussian noise spectra

Fig. 2. Numerical simulation results of relative flatness for different numbers of optical spectra and FWHM in frequency range of 90-140 GHz

Fig. 3. Experimental setup for generating flat millimeter-wave noise using optical mixing of multiple Gaussian noise spectra

Fig. 4. Experimental results. (a) Three Gaussian noise spectra after filtering; (b) radio frequency spectrum output from mixing of three optical spectra; (c) two Gaussian noise spectra after filtering; (d) radio frequency spectrum output from mixing of two optical spectra

Fig. 5. Simulation results. (a) Six Gaussian noise spectra after filtering; (b) radio frequency spectrum output from mixing of multiple optical spectra; (c) two Gaussian noise spectra after filtering; (d) radio frequency spectrum output from mixing of two optical spectra