Optical frequency synthesis by offset-locking the tunable local-oscillator of a low-power integrated receiver to a microresonator comb

A power-efficient and highly-integrated photonic system, producing low phase-noise coherent optical signal with a wavelength range of 23 nm in the C-band, is presented. The system includes novel InP-photonic integrated coherent receiver circuits that consume record-low (approximately 184 mW) electrical power.