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We report an all-optical radio-frequency (RF) spectrum analyzer with abandwidth greater than 5 terahertz (THz), based on a 50-cm long spiralwaveguide in a CMOS-compatible high-index doped silica platform. By carefullymapping out the dispersion profile of the waveguides for different thicknesses,we identify the optimal design to achieve near zero dispersion in the C-band.To demonstrate the capability of the RF spectrum analyzer, we measure theoptical output of a femtosecond fiber laser with an ultrafast optical RFspectrum in the terahertz regime.

Radio frequency spectrum analyzer with a 5 THz bandwidth based on nonlinear optics in a CMOS compatible high-index doped silica waveguide