基于电光法珀腔的超快微波光子学频率测量技术研究
发布时间：2019-04-12 20:09
【摘要】：在雷达和电子战系统中,频率测量被广泛用于未知信号的探测和辨别。相比于传统的电子学技术,基于微波光子学的频率测量方法如信道法、功率映射法和扫描法等具有大带宽、低损耗、免疫电磁干扰等优点,成为研究的热点,其中微波光子学扫描法频率测量受到最大关注。但是目前的扫描法频率测量依赖于机械式调谐、热调谐、微波源扫频或频移环等方式进行扫描,扫描时间长、测频速度慢。针对这一问题,本文将电光法珀腔这一模型引入到到微波光子学频率测量领域,提出了基于电光法珀腔的超快微波光子学扫描法频率测量系统,并对该系统的测频性能进行了理论分析和实验研究。本文首先阐述了基于电光法珀腔的频率测量系统的工作原理,对该系统涉及到的基本理论知识进行了详细描述,并对该系统的主要性能参数及其决定因素进行了分析。然后设计、制备了该系统的核心器件电光法珀腔并进行了性能测试,测试结果表明电光法珀腔的扫描频率可以达到1 MHz。最后搭建了基于电光法珀腔的测频系统进行实验验证,结果表明该系统可以实现频率测量,测频范围为3.2 GHz,扫描电压峰峰值仅为7.0 V,在扫描频率为0.1 MHz时系统的测频精度为±0.025 GHz,当增大扫描频率时,系统的测频精度开始降低,在1.0 MHz时测频精度±0.1 GHz。另外我们提出了利用双电光法珀腔系统改善单腔系统的测频范围,理论和仿真结果表明双腔系统可以在保证精度和速度的同时将测频范围从3.2 GHz提高到54 GHz。双腔系统的测频精度和测频范围受限于制备工艺导致的损耗,采用更先进的工艺系统在这两个方面的性能可以进一步提高。与现有的其它微波光子学扫描法频率测量系统相比,基于电光法珀腔的频率测量系统结构非常简单,不需要额外的微波源、泵浦源或是长光纤,只需要施加峰峰值为7.0 V的扫描电压就能实现频率测量,对探测器的带宽要求也非常低。具有结构简单、成本低廉、低压操作的优点,可以用来探测持续时间非常短的信号,具有非常好的应用前景。
[Abstract]:In radar and EW systems, frequency measurement is widely used to detect and identify unknown signals. Compared with the traditional electronics technology, the frequency measurement methods based on microwave photonics, such as channel method, power mapping method and scanning method, have many advantages, such as large bandwidth, low loss, immunity to electromagnetic interference, and so on. Among them, the microwave photonics scanning method is the most concerned about the frequency measurement. However, the current scanning methods rely on mechanical tuning, thermal tuning, microwave source sweep or frequency shift loop for scanning. The scanning time is long and the frequency measurement speed is slow. In order to solve this problem, the electro-optic Fabry-Perot cavity model is introduced into the field of microwave photonics frequency measurement, and an ultra-fast microwave photonics scanning frequency measurement system based on electro-optic Fabry-Perot cavity is proposed. The frequency measurement performance of the system is analyzed theoretically and experimentally. In this paper, the working principle of the frequency measurement system based on electro-optic Fabry-Perot cavity is described in detail, the basic theoretical knowledge involved in the system is described in detail, and the main performance parameters and the determining factors of the system are analyzed. Then, the electro-optic Fabry-Perot cavity is fabricated and its performance is tested. The results show that the scanning frequency of the electro-optic Fabry-Perot cavity can reach 1 MHz.. Finally, a frequency measurement system based on electro-optic Fabry-Perot cavity is set up for experimental verification. The results show that the system can realize the frequency measurement, and the frequency measurement range is 3.2 GHz, the peak voltage peak is only 7.0V, When the scanning frequency is 0.1 MHz, the frequency measurement accuracy of the system is 卤0.025 GHz,. When the scanning frequency is increased, the frequency measurement accuracy of the system begins to decrease, and at 1.0 MHz, the frequency measurement accuracy is 卤0.1 GHz.. In addition, the frequency measurement range of single cavity system is improved by using double electro-optic Fabry-Perot cavity system. The theoretical and simulation results show that the frequency measurement range can be improved from 3.2 GHz to 54 GHz. while ensuring the accuracy and speed of the dual-cavity system. The precision and range of frequency measurement of the two-cavity system are limited by the loss caused by the fabrication process. The performance of the more advanced process system in these two aspects can be further improved. Compared with other existing microwave photonics scanning frequency measurement systems, the frequency measurement system based on electro-optic cavity is very simple and does not require additional microwave source, pump source or long fiber. The frequency measurement can be achieved only by applying a scanning voltage with a peak of 7.0 V, and the bandwidth of the detector is also very low. It has the advantages of simple structure, low cost and low voltage operation. It can be used to detect the signal with very short duration and has a very good application prospect.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TM935.1
，
本文编号：2457353
[Abstract]:In radar and EW systems, frequency measurement is widely used to detect and identify unknown signals. Compared with the traditional electronics technology, the frequency measurement methods based on microwave photonics, such as channel method, power mapping method and scanning method, have many advantages, such as large bandwidth, low loss, immunity to electromagnetic interference, and so on. Among them, the microwave photonics scanning method is the most concerned about the frequency measurement. However, the current scanning methods rely on mechanical tuning, thermal tuning, microwave source sweep or frequency shift loop for scanning. The scanning time is long and the frequency measurement speed is slow. In order to solve this problem, the electro-optic Fabry-Perot cavity model is introduced into the field of microwave photonics frequency measurement, and an ultra-fast microwave photonics scanning frequency measurement system based on electro-optic Fabry-Perot cavity is proposed. The frequency measurement performance of the system is analyzed theoretically and experimentally. In this paper, the working principle of the frequency measurement system based on electro-optic Fabry-Perot cavity is described in detail, the basic theoretical knowledge involved in the system is described in detail, and the main performance parameters and the determining factors of the system are analyzed. Then, the electro-optic Fabry-Perot cavity is fabricated and its performance is tested. The results show that the scanning frequency of the electro-optic Fabry-Perot cavity can reach 1 MHz.. Finally, a frequency measurement system based on electro-optic Fabry-Perot cavity is set up for experimental verification. The results show that the system can realize the frequency measurement, and the frequency measurement range is 3.2 GHz, the peak voltage peak is only 7.0V, When the scanning frequency is 0.1 MHz, the frequency measurement accuracy of the system is 卤0.025 GHz,. When the scanning frequency is increased, the frequency measurement accuracy of the system begins to decrease, and at 1.0 MHz, the frequency measurement accuracy is 卤0.1 GHz.. In addition, the frequency measurement range of single cavity system is improved by using double electro-optic Fabry-Perot cavity system. The theoretical and simulation results show that the frequency measurement range can be improved from 3.2 GHz to 54 GHz. while ensuring the accuracy and speed of the dual-cavity system. The precision and range of frequency measurement of the two-cavity system are limited by the loss caused by the fabrication process. The performance of the more advanced process system in these two aspects can be further improved. Compared with other existing microwave photonics scanning frequency measurement systems, the frequency measurement system based on electro-optic cavity is very simple and does not require additional microwave source, pump source or long fiber. The frequency measurement can be achieved only by applying a scanning voltage with a peak of 7.0 V, and the bandwidth of the detector is also very low. It has the advantages of simple structure, low cost and low voltage operation. It can be used to detect the signal with very short duration and has a very good application prospect.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TM935.1
，
本文编号：2457353
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