Research On Microwave Photonic Channelized Receiver Technology Based On Optical Frequency Shifter

As modern communication,radar,electronic warfare systems continuously to the high-speed rate,broadband direction,the existing electronic devices to deal with RF signals are facing the electronic bottleneck problem of bandwidth.The function of the channelized receiver is to cut the received broadband RF signal into different narrowband sub-channel RF signals,the traditional electrical channelized receiver not only has the problem of complex and large system there are technical problems of small sensing bandwidth.Recently,with the continuous development of microwave photonics interdisciplinary,broadband RF signal channelization receiver based on microwave photonics has been rapidly developed,forming a continuous passband optical filter-based microwave photonics channelization receiver,based on a single optical frequency comb source and periodic optical filter microwave photonics channelization receiver,based on dual optical frequency comb and coherent reception of microwave photonics channelization receiver.Among them,the microwave photonic channelization receiver based on dual optical frequency combs and coherent reception has the problem of complex system structure due to large interval and multiple comb lines of optical frequency combs.Therefore,this thesis focuses on the problems of microwave photonic channelization receiver schemes based on dual optical frequency combs and coherent reception.1.To tackle the problem that a microwave photonics channelization receiver requires two large interval and complex optical frequency comb sources with multiple comb lines,an acoustic-optic frequency shifter-based microwave photonics channelization receiver scheme is proposed,which reduces the optical frequency comb source generator required for this microwave photonics channelization receiver and reduces the system overhead and complexity by introducing an acoustic-optic frequency shifter.The proposed microwave photonic channelization scheme is verified by using co-simulation to cut the linear frequency modulated signal into eight narrow-band sub-channels,and the effect of the acousto-optic frequency shifter shift error on the quality of the transmitted signal is analyzed.At the meantime,a partial experimental demonstration of the proposed scheme is made by using limited experimental equipment,and the feasibility of the proposed acousto-optical frequency shifter-based microwave photonic channelization receiver scheme is experimentally verified.2.In response to the problem that the proposed acousto-optic frequency shifter-based microwave photonics channelization receiver requires a limited amount of acousto-optic frequency shifter,a microwave photonics channelization receiver scheme based on a large interval frequency shifter is proposed.By using large interval frequency shifter,the limited frequency shift of acousto-optic frequency shifter is overcome,and the number of sub-channels after channelization is increased.The feasibility of the system scheme was verified by co-simulation.