Passively mode-locked III–V-on-silicon laser with 1 GHz repetition rate

We present an on-chip III-V-on-silicon mode-locked laser at 1.6 μm with a 1 GHz repetition rate and -6 dBm output in the waveguide. The optical spectrum showed a 10.8 nm wide comb, the corresponding pulses showed an autocorrelation trace FWHM of 11 ps. A high purity RF spectrum was measured.