Design method for multi-wavelength ultrashort-pulse mode-locked photonic integrated chip with high repetition frequency, product and application

The invention discloses a design method for a mode-locked photonic integrated chip with high repetition frequency, a product and an application. The chip comprises a semiconductor optical amplifier array which provides gain for channels with N wavelengths; a phase delay line array which comprises phase delay lines with different lengths and is used for respectively compensating different effectiveoptical path differences of the gain light of each wavelength channel caused by a dispersion effect; a planarized arrayed waveguide grating which is used for multiplexing the gain light subjected toeffective optical path difference compensation and multiplexing N paths of optical pulse signals into one path of optical pulse signals; a saturable absorber, wherein the saturable absorber and the arrayed waveguide grating form N independent and synchronous mode-locked optical pulse channels with different wavelengths; wherein the semiconductor optical amplifier is used for gaining and outputtingoutput pulses of the satur