基于可调光延迟线的微波光子零中频接收机研究  

Optical Delay Line-Based Microwave Photonic Zero-Intermediate-Frequency Receiver

作　　者：梅理 崇毓华 朱宇鹏 彭卫[1,2] 王冰 Mei Li;Chong Yuhua;Zhu Yupeng;Peng Wei;Wang Bing(The 38th Research Institute of China Electronics Technology Group Corporation,Hefei,Anhui 230000,China;Anhui Province Engineering Laboratory for Antennas and Microwave,Hefei,Anhui 230000,China)

机构地区：[1]中国电子科技集团公司第三十八研究所,安徽合肥230000 [2]安徽省天线与微波工程实验室,安徽合肥230000

出　　处：《中国激光》2021年第9期113-121,共9页Chinese Journal of Lasers

基　　金：国家重点研发计划(2019YFB2203201)。

摘　　要：提出了一种基于可调光延迟线的微波光子正交解调技术,并基于该技术设计了微波光子零中频接收机。通过调节光延迟线实现本振信号的90°移相,并采用波分复用方法在共用的级联马赫-曾德尔调制器结构中实现两条正交链路的射频信号与本振信号的混频,从而提高了光正交解调的幅相一致性。所设计的微波光子零中频接收机可对光正交解调之后的中频处理器件如光电探测器、滤波器以及模数转换器等引起的链路幅相不平衡进行数字补偿。经数字幅相失衡补偿后,微波光子零中频接收机在中心频率为12 GHz、瞬时带宽为4 GHz的工作频段内测得幅度不平衡小于0.4 dB,相位不平衡小于1.5°,镜频抑制度大于45 dB,最高镜频抑制度可达79 dB。Objective The next-generation radar systems make increasing demands on receivers,such as large instantaneous bandwidth for increased resolution,wide operating frequency for multi-function,and high radio frequency(RF)isolation for large-scale phased array antenna systems.These demands are enormous for electronic receiver technologies.Owing to the advantages of large bandwidth,high isolation,and immunity to electromagnetic interference,photonic-assisted microwave processing techniques provide new solutions for radar receivers.A zero-intermediate-frequency(IF)in-phase and quadrature(I/Q)receiver using microwave photonic technology,exploiting the advantages of the ultrawideband photonic processing technology and agile electronic digital processing technology,has become a competitive solution for wideband radar systems.Recent studies on microwave photonic I/Q receivers obtain the 90°phase shift between I/Q signals by adjusting the phase of signals in optical frequency.Commonly employed optical phase shift methods,such as using an optical 90°hybrid or adjusting a polarization controller,experience disturbance of temperature and stress.In these methods,a narrow bandpass optical filter or complicate electronic-optical modulation is needed for carrier-suppressed single-sideband modulation,which restricts the operation frequency of photonic I/Q receivers.Besides,the amplitude and phase imbalances of the I/Q channels induced by the IF processing devices,such as photodiodes(PDs),low-pass filters,and analog-to-digital converters(ADCs)are rarely considered recently.Our research on a simple and stable microwave photonic I/Q receiver has potential in radar detection applications.Methods By converting input RF signal into zero IF signals with an I/Q mixer,the I/Q receiver can realize cancellation of image interference,thus doubling receiver's working bandwidth(Fig.1).However,as it is hard for electronic devices to keep high amplitude and phase consistency in wide bandwidth,the image cancellation decreases in ultrawideband recei

关 键 词：光通信 微波光子 宽带接收机 零中频 镜频抑制 

分 类 号：TN29[电子电信—物理电子学]