Electrical injection locking of a fully integrated photonic integrated circuit based heterodyne source

We report the stabilization of a 5 GHz signal generated from a fully integrated heterodyne photonic source. The demonstration differs from previous work as it uses only optoelectronic elements integrated in the photonic circuit. We have mutually correlate the phase noise of each integrated DFB and we stabilize the RF beating on the external reference using frequency comb generation and cross injection locking.