Low phase noise fully integrated millimeter-wave photonic source using cross injection locking

We report the stabilization of a 90 GHz mmW signal generated from a fully integrated photonic source. The chip consists of two distributed feedback (DFB) single mode lasers which optical signals are combined on a fast photodiode to generate a largely tunable heterodyne beat note. By generating an optical comb from each laser, thanks to an external synthesizer, and by optically self-injecting the resulting signal, we mutually correlate the phase noise of each DFB and we stabilize the RF beating on the external reference. The performances achieved beating linewidth below 30 Hz.