An optical RF memory(ORFM)based on a fiber acousto-optic frequency shifting loop(AO-FSL)for microwave signal storage with,to our knowledge,a record-long storage time of 13 ms is proposed and experimentally demonstrate...An optical RF memory(ORFM)based on a fiber acousto-optic frequency shifting loop(AO-FSL)for microwave signal storage with,to our knowledge,a record-long storage time of 13 ms is proposed and experimentally demonstrated.The key to achieving a long storage time is the use of a distributed Raman fiber amplifier(DRFA)that can compensate for the loop loss while maintaining an ultra-low noise figure(NF).An acousto-optic frequency shifter is employed in the loop to avoid lasing.To test the ORFM,a microsecond-long microwave signal is amplitude-modulated on an optical carrier and injected into the AO-FSL.Experimental results show that the ORFM enables the storage of microwave signals,including single-tone and linearly frequency modulated(LFM)microwave signals,with signal durations up to 10μs and a record-long storage time of 13 ms.This corresponds to more than 300 circulations in the AO-FSL,representing the highest number ever reported to date.Compared with a digital RF memory,our proposed ORFM eliminates the need for the high-speed analog-to-digital converter(ADC)and digital-to-analog converter(DAC),offering a wide operational bandwidth and simplified system architecture.These advantages make it particularly well-suited for electronic warfare applications where an ORFM having a long storage time and a high signal fidelity is needed.展开更多
基金National Key Research and Development Program of China(2024YFB2807400)National Natural Science Foundation of China(62275107)+1 种基金Natural Science Foundation of Guangdong Province General Program(2021A1515011944)Guangdong Engineering Technology Research Center for Integrated Space-Terrestrial Wireless Optical Communication。
文摘An optical RF memory(ORFM)based on a fiber acousto-optic frequency shifting loop(AO-FSL)for microwave signal storage with,to our knowledge,a record-long storage time of 13 ms is proposed and experimentally demonstrated.The key to achieving a long storage time is the use of a distributed Raman fiber amplifier(DRFA)that can compensate for the loop loss while maintaining an ultra-low noise figure(NF).An acousto-optic frequency shifter is employed in the loop to avoid lasing.To test the ORFM,a microsecond-long microwave signal is amplitude-modulated on an optical carrier and injected into the AO-FSL.Experimental results show that the ORFM enables the storage of microwave signals,including single-tone and linearly frequency modulated(LFM)microwave signals,with signal durations up to 10μs and a record-long storage time of 13 ms.This corresponds to more than 300 circulations in the AO-FSL,representing the highest number ever reported to date.Compared with a digital RF memory,our proposed ORFM eliminates the need for the high-speed analog-to-digital converter(ADC)and digital-to-analog converter(DAC),offering a wide operational bandwidth and simplified system architecture.These advantages make it particularly well-suited for electronic warfare applications where an ORFM having a long storage time and a high signal fidelity is needed.
