Optical fiber system for real-time Fourier transformation of nanosecond-long broadband microwave waveforms

We experimentally achieve microwave dispersions approaching 24ns/GHz (equivalent to the dispersion of ~185,000-km of standard single-mode fiber) using a fiber-optic incoherent processing setup. The scheme is used for real-time Fourier transformation of nanosecond-long microwave waveforms with bandwidths over 20 GHz.