Ultra-low-noise microwave signals play a driving role in the development of modern scientific technologies such as radar,communication,and sensing.On-chip photonic integration provides an attractive approach for the i...Ultra-low-noise microwave signals play a driving role in the development of modern scientific technologies such as radar,communication,and sensing.On-chip photonic integration provides an attractive approach for the implementation of ultra-low-noise microwave signal sources with attractive added advantages of being compact and lightweight,which are vitally important for real-world applications.Coupled optoelectronic oscillators(COEOs)with a hybrid structure of an optical loop and an optoelectronic loop are high-performance microwave photonic signal sources,which feature a unique advantage over conventional single-loop OEOs since they can achieve ultra-low phase noise with a relatively short cavity length.Here we report a wideband tunable ultra-lownoise integrated COEO(ICOEO),which is realized by integrating its key optoelectronic components(electrooptic modulator,photodetector,optical filter,etc.)on silicon-on-insulator(SOI).A wideband frequency tuning range from 2 GHz to 30 GHz is obtained,covering the entire S,C,X,Ku,and K bands.The phase noise is as low as−132 dBc/Hz@10 kHz,which is 19 dB better than that of the single-loop OEO with a similar cavity length.We also improved the long-term stability of the ICOEO by injection locking,and the Allan deviation of the produced microwave signal reaches 10^(−12)@1 s.The high-performance ICOEO can find a wide range of applications including modern radar,electronic warfare,and communication systems.展开更多
基金Natural Science Foundation of Beijing Municipality(Z210005)National Natural Science Foundation of China(62205329,61925505,62235015)Young Elite Scientists Sponsorship Program by CAST(YESS20230216)。
文摘Ultra-low-noise microwave signals play a driving role in the development of modern scientific technologies such as radar,communication,and sensing.On-chip photonic integration provides an attractive approach for the implementation of ultra-low-noise microwave signal sources with attractive added advantages of being compact and lightweight,which are vitally important for real-world applications.Coupled optoelectronic oscillators(COEOs)with a hybrid structure of an optical loop and an optoelectronic loop are high-performance microwave photonic signal sources,which feature a unique advantage over conventional single-loop OEOs since they can achieve ultra-low phase noise with a relatively short cavity length.Here we report a wideband tunable ultra-lownoise integrated COEO(ICOEO),which is realized by integrating its key optoelectronic components(electrooptic modulator,photodetector,optical filter,etc.)on silicon-on-insulator(SOI).A wideband frequency tuning range from 2 GHz to 30 GHz is obtained,covering the entire S,C,X,Ku,and K bands.The phase noise is as low as−132 dBc/Hz@10 kHz,which is 19 dB better than that of the single-loop OEO with a similar cavity length.We also improved the long-term stability of the ICOEO by injection locking,and the Allan deviation of the produced microwave signal reaches 10^(−12)@1 s.The high-performance ICOEO can find a wide range of applications including modern radar,electronic warfare,and communication systems.
