Mode-locked photonic integrated circuits for millimeter and terahertz wave wireless communications

We present a 160 GHz pulsed source, based on an on-chip repetition rate multiplier scheme to double the repetition rate of an 80 GHz multiple pulse colliding mode-locked (mCPM) laser. For the first time to our knowledge, we demonstrate the monolithic integration of the mCPM laser and the pulse rate multiplier structures, using a generic foundry approach. From a 20 GHz fundamental repetition rate we achieve a ×4 increase, up to 160 GHz. The FWHM pulse width of 160 GHz pulse train is 0.979 ps.