基于光子技术的实时频率测量方法  

Real-time frequency measurement method based on photonic technique

作　　者：胡墅[1] 韩秀友[1] 石暖暖 谷一英[1] 胡晶晶[1] 赵明山[1] 

机构地区：[1]大连理工大学物理与光电工程学院,辽宁大连116024

出　　处：《大连理工大学学报》2014年第1期1-5,共5页Journal of Dalian University of Technology

基　　金：国家自然科学基金资助项目(60807015);辽宁省自然科学基金资助项目(20102020);中央高校基本科研业务费专项资金资助项目(DUT13JB01;DUT13RC204)

摘　　要：研究了一种基于光子技术的实时频率测量方法，该方法利用两个级联强度调制器构成光子混频结构．通过理论分析与模拟仿真，设计了光通道与射频通道延时差，以优化测量带宽，同时保证测量精度．由于测量系统对微波信号实现混频后，输出的直流光功率与频率存在对应关系，利用光功率计对直流光功率进行监测，便可实现实时频率测量．该系统未采用光电探测器，极大地降低了系统成本．实验结果表明，在1～6 GHz频率下，测量误差低于±0．12 GHz ．A real-time frequency measurement method based on photonic technique is investigated .In this scheme , two cascaded intensity modulators are utilized to make up the structure of photonic mixing .By theoretical analysis and simulation , the time delay between optical path and radio-frequency （RF ） path is designed in order to optimize the measurement range and ensure the measurement accuracy as well .After the microwave signal mixed in the measurement system ,there is a relationship between direct current （DC） optical power and microwave frequency ,so the real-time frequency measurement by using optical power meter to monitor the DC optical power can be realized . The scheme has not employed photodetector ,and thus the system cost is reduced .The experimental results demonstrate that the measurement error is less than ± 0 .12 GHz in the frequency range of 1 to 6 G Hz .

关 键 词：实时频率测量 微波光子学 光子混频 

分 类 号：TN929.11[电子电信—通信与信息系统]