A low noise oscillator is a crucial component in determining system performance in modern communication,microwave spectroscopy,microwave-based sensing(including radar and remote sensing),and metrology systems.In recen...A low noise oscillator is a crucial component in determining system performance in modern communication,microwave spectroscopy,microwave-based sensing(including radar and remote sensing),and metrology systems.In recent years,ultra-low phase noise photonic microwave oscillators based on optical frequency division have become a paradigm shift for the generation of high performance microwave signals.In this work,we report on-chip low phase noise photonic microwave generation based on spiral resonator referenced lasers and an integrated electro-optical frequency comb.Dual lasers are co-locked to an ultra-high-Q silicon nitride spiral resonator and their relative phase noise is measured below the cavity thermal noise limit,resulting in record low onchip optical phase noise.A broadband integrated electro-optic frequency comb is utilized to divide down the relative phase noise of the spiral resonator referenced lasers to the microwave domain,resulting in recordlow phase noise for chip-based oscillators(-69 d Bc∕Hz at 10 Hz offset,and-144 d Bc∕Hz at 10 k Hz offset for a 10 GHz carrier scaled from 37.3 GHz output).The exceptional phase noise performance,planar chip design,high technology readiness level,and foundry-ready processing of the current work represent a major advance of integrated photonic microwave oscillators.展开更多
基金Defense Advanced Research Projects Agency(HR001122C0019)。
文摘A low noise oscillator is a crucial component in determining system performance in modern communication,microwave spectroscopy,microwave-based sensing(including radar and remote sensing),and metrology systems.In recent years,ultra-low phase noise photonic microwave oscillators based on optical frequency division have become a paradigm shift for the generation of high performance microwave signals.In this work,we report on-chip low phase noise photonic microwave generation based on spiral resonator referenced lasers and an integrated electro-optical frequency comb.Dual lasers are co-locked to an ultra-high-Q silicon nitride spiral resonator and their relative phase noise is measured below the cavity thermal noise limit,resulting in record low onchip optical phase noise.A broadband integrated electro-optic frequency comb is utilized to divide down the relative phase noise of the spiral resonator referenced lasers to the microwave domain,resulting in recordlow phase noise for chip-based oscillators(-69 d Bc∕Hz at 10 Hz offset,and-144 d Bc∕Hz at 10 k Hz offset for a 10 GHz carrier scaled from 37.3 GHz output).The exceptional phase noise performance,planar chip design,high technology readiness level,and foundry-ready processing of the current work represent a major advance of integrated photonic microwave oscillators.
