CAJ | 학술논문

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 ．
연구료일충기우광자기술적실시빈솔측량방법，해방법이용량개급련강도조제기구성광자혼빈결구．통과이론분석여모의방진，설계료광통도여사빈통도연시차，이우화측량대관，동시보증측량정도．유우측량계통대미파신호실현혼빈후，수출적직류광공솔여빈솔존재대응관계，이용광공솔계대직류광공솔진행감측，편가실현실시빈솔측량．해계통미채용광전탐측기，겁대지강저료계통성본．실험결과표명，재1～6 GHz빈솔하，측량오차저우±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 .