Research on calibration method of comb generator

We describe two calibration methods of comb generator(CG) as harmonic phase reference, one is based on digital sampling oscilloscope(DSO) and the other is based on electro-optic sampling system(EOS). We calibrate Agilent U9391F CG using these two methods and compare the differences between the results. The conclusion of the research has the potential to serve the phase calibration of nonlinear instruments and devices like nonlinear vector network analyzer(NVNA), large signal network analyzer(LSNA), amplifier, etc.