基于光子混频的微波频率测量技术

发布时间：2019-04-24 04:54

【摘要】：提出了一种基于光子混频的光子学微波频率测量方法。方法采用可调微波延时线控制射频(RF)通道与光通道之间延时,利用两个级联马赫曾德调制器(MZM)进行光子混频,进而建立微波频率与直流光功率之间关系。通过仿真与分析,合理设计RF通道与光通道之间延时,优化了系统频率测量范围。仿真结果表明,光通道延时与RF通道1的延时差Δτ1选取在15ps附近,两个RF通道之间延时差Δτ选择在20ps附近时,对于1~6GHz范围的频率测量较为合适。实验中,采用矢量网络分析仪对延时进行测量,得到Δτ1为17.7ps,Δτ为16.9ps。测试结果表明,在1~6GHz频率下,系统测量精度在±0.2GHz以内。系统的测量误差主要来自于矢量网络分析仪对相位测量的不确定度,以及激光器输出光功率的波动,通过采取相应的措施可以提高系统测量精度。本文方法为微波频率测量提供了一种低成本光子学解决手段。
[Abstract]:A photonics microwave frequency measurement method based on photon mixing is proposed. Methods Tunable microwave delay line was used to control the delay between RF (RF) channel and optical channel. Two cascaded Mach Zehnder modulator (MZM) were used for photon mixing, and the relationship between microwave frequency and DC optical power was established. Through simulation and analysis, the delay between RF channel and optical channel is reasonably designed, and the measuring range of system frequency is optimized. The simulation results show that when the delay difference between optical channel delay and RF channel 1 is near 15ps and the delay difference between two RF channels is near 20ps, it is more suitable for the frequency measurement of 1~6GHz range. In the experiment, the delay is measured by means of vector network analyzer. 螖蟿 1 is 17.7 PS and 螖蟿 is 16.9 PS. The test results show that the measurement accuracy of the system is less than 卤0.2GHz at 1~6GHz frequency. The measurement error of the system mainly comes from the uncertainty of the phase measurement of the vector network analyzer and the fluctuation of the output optical power of the laser. The measurement accuracy of the system can be improved by taking the corresponding measures. This method provides a low cost photonics solution for microwave frequency measurement.
【作者单位】：大连理工大学物理与光电工程学院;
【基金】：国家自然科学基金(60807015) 辽宁省自然科学基金(20102020) 中央高校基本科研业务费专项资金(DUT13JB01,DUT13RC204)资助项目
【分类号】：TN929.1

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