基于PDM-DPMZM的大动态范围微波光子I/Q下变频系统  

Large Dynamic Range Microwave Photonic I/Q Down-Conversion System Based on PDM-DPMZM

作　　者：史芳静 樊养余[1] 王鑫圆 康博超 陈博 高永胜 SHI Fang-jing;FAN Yang-yu;WANG Xin-yuan;KANG Bo-chao;CHEN Bo;GAO Yong-sheng(School of Electronics and Information,Northwestern Polytechnical University,Xi’an,Shaanxi 710072,China)

机构地区：[1]西北工业大学电子信息学院,陕西西安710072

出　　处：《电子学报》2022年第4期782-788,共7页Acta Electronica Sinica

基　　金：国家自然科学基金(No.62171374);博士后创新人才支持计划(No.BX201700197);中国博士后科学基金(No.2017M623238);陕西省重点研发计划(No.2021GY-096,No.2021NY-213)。

摘　　要：针对被目前大多微波光子I/Q下变频系统忽视的非线性失真问题,提出了一种基于偏振复用双平行马赫增德尔调制器(Polarization Division Multiplexing Dual-Parallel Mach-Zehnder Modulator,PDM-DPMZM)的大动态范围微波光子I/Q下变频系统.利用PDM-DPMZM并行地调制射频、本振和镜像信号,调节调制器的直流偏置并进行驱动信号功率控制,能够实现I/Q下变频及镜像干扰抑制,同时抑制三阶交调失真.实验结果表明,所提方案最终可以实现超过44 dB的镜像抑制,系统的无杂散动态范围达到110.5(dB·Hz^(4/5)).在5~20 GHz工作频率范围内,相位失衡和幅度失衡分别低于0.8°和0.6 dB.Aiming at the nonlinear distortion problem ignored by most microwave photonic I/Q down-conversion systems,a large dynamic range microwave photonic I/Q down-conversion system based on the polarization division multiplexing dual-parallel Mach-Zehnder modulator(PDM-DPMZM)is proposed.The PDM-DPMZM is used to modulate the radio frequency signal,local oscillator signal,and image signal in parallel.By adjusting the DC bias of the modulator and the powers of the drive signals,the I/Q down-conversion and image interference suppression can be realized.The third-order intermodulation distortion can be suppressed at the same time.Experimental results show that the proposed scheme can achieve an image rejection ratio of more than 44 dB.The spur-free dynamic range can reach 110.5 dB·Hz^(4/5).In the 5-20 GHz operating frequency range,the phase imbalance and amplitude imbalance are lower than 0.8°and 0.6 dB,respectively.

关 键 词：微波光子 镜像抑制 I/Q下变频 动态范围 偏振复用双平行马赫增德尔调制器 

分 类 号：TN29[电子电信—物理电子学]