基于非对称MZI的微波频率实时测量技术

发布时间：2018-03-18 22:44

本文选题：微波光电子　切入点：铌酸锂波导　出处：《电子科技大学》2014年硕士论文　论文类型：学位论文

【摘要】：随着无线通信以及雷达技术的不断发展发展,现代电子战和雷达战中,截断和分析敌方通信系统的微波信号已经被放到了一个非常重要的高度。来自敌方的微波信号可能存在于非常宽的频带上,但现阶段典型的微波接收机仅仅能工作在非常窄的频带内。基于这种矛盾,一个能够实时而准确测量微波信号载波频率的器件就显得十分重要了。实现这种功能的系统被称之为实时频率测量(IFM)系统。利用新兴的微波光电子技术,通过引入光子学方法来实现微波系统中较难实现的信号处理功能,可以实现重量轻,尺寸小,损耗低,频带宽,电磁干扰免疫的微波频率测量。该方法己得到了国内外专家学者的广泛关注,成为了当前的研究热点。现阶段的光学微波频率测量还存在集成度不高、结构复杂、测量效果欠佳等缺点,未能实用化。本论文正是针对上述问题,提出了一种基于非对称MZI的微波频率实时测量技术。该技术可完成从电光调制到信号处理的一体集成,结构简单,理论测量精度达到0.1 GHz,微波频率测量频带覆盖1~20 GHz,提高了现有光学微波频率测量技术的性能,进一步接近实用化。首先,论文介绍了基于非对称MZI的微波实时测量技术中涉及的基本理论,进而分析了该测量技术的工作原理,并对光学传输特性进行了推导,验证了设计的可行性,同时对该测量技术的描述参数进行了简单说明。其次,论文对基于非对称MZI的微波实时测量技术中涉及的关键器件,特别是可实现一体加工的Li Nb O3波导部分,进行了讨论设计,给出了满足微波频率测量的要求的参数量值。这些关键器件决定了基于非对称MZI的微波实时测量技术的固有特性:波导单模工作;非对称区弯曲损耗小于1 d B;微波输入频率1~30 GHz;自由光谱范围35 GHz。然后,论文分析讨论了光波导器件外的其他性能参数对微波频率测量的影响,包括光源特性、探测系统性能、接收系统性能三方面,给出了他们对微波频率测量的影响,得到了合理的参考量值。从而完成了整个基于非对称MZI的微波实时测量系统的设计,得出所设计系统的性能参数。最后,设计实验证明了该设计的可行性。得到了不同工作点下待测微波频率与输出光功率的关系。
[Abstract]:With the development of wireless communication and radar technology, modern electronic warfare and radar warfare, Truncation and analysis of microwave signals in enemy communication systems have been placed at a very important height. Microwave signals from the enemy may exist in a very wide frequency band. But the typical microwave receiver at this stage can only work in a very narrow band. A device that can measure the carrier frequency of microwave signals in real time and accurately is very important. By introducing photonics to realize the signal processing function which is difficult to realize in microwave system, it can realize light weight, small size, low loss, low frequency bandwidth. The microwave frequency measurement of electromagnetic interference immunity (EMI), which has been paid more and more attention by experts and scholars at home and abroad, has become a hot research topic at present. At present, the optical microwave frequency measurement still has low integration and complex structure. This paper presents a microwave frequency real-time measurement technology based on asymmetric MZI, which can integrate from electro-optic modulation to signal processing. The structure is simple, the precision of theoretical measurement is 0.1 GHz, and the frequency band of microwave frequency measurement is 1 ~ 20 GHz, which improves the performance of the existing optical microwave frequency measurement technology and is closer to practical use. This paper introduces the basic theory of microwave real-time measurement technology based on asymmetric MZI, and then analyzes the working principle of the measurement technology, and deduces the optical transmission characteristics, and verifies the feasibility of the design. At the same time, the description parameters of the measurement technology are simply explained. Secondly, the key devices involved in the microwave real-time measurement technology based on asymmetric MZI, especially the Linbo 3 waveguide, which can be fabricated in an integrated way, are discussed in this paper. This paper discusses the design and gives the parameter values to meet the requirements of microwave frequency measurement. These key devices determine the inherent characteristics of microwave real-time measurement technology based on asymmetric MZI: waveguide single-mode operation; The bending loss in asymmetric region is less than 1 dB; the microwave input frequency is 1 ~ 30 GHz; the free spectrum range is 35 GHz. Then, the influence of other performance parameters outside the optical waveguide device on the microwave frequency measurement is analyzed and discussed, including the characteristics of the light source and the performance of the detection system. Three aspects of the performance of the receiving system are given, and their influence on the microwave frequency measurement is given, and the reasonable reference value is obtained. Thus, the design of the microwave real-time measurement system based on asymmetric MZI is completed. The performance parameters of the designed system are obtained. Finally, the feasibility of the design is proved by the design experiment, and the relationship between the microwave frequency to be measured and the output optical power at different operating points is obtained.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM935

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