微波光子滤波器和移相器研究

发布时间：2019-04-21 16:26

【摘要】：微波光子学主要研究光信号与微波信号的相互作用,研究的范围包括工作在微波频段的光学器件以及微波仪器在光学系统中的应用。与传统的微波信号处理技术相比,微波光子学具有广阔的应用前景,这主要是因为这一信号处理技术具有工作带宽大,损耗小,抗电磁干扰能力强等优点。本研究主要对微波光子滤波器和微波光子移相器两个方向进行相关的探究,由以下几个部分组成:(1)具有平坦群延时的高精度微波光子陷波滤波器的设计。首先,通过理论分析找出了影响微波光子滤波器群延时的原因:滤波器的冲击响应分布是否对称。然后,仿真和实验验证了这一结论。最后,实验实现了一个陷波微波光子滤波器,滤波器在通带内的幅值抖动很小,陷波深度为40d Bm,群延时抖动不大于±25ps。(2)大带宽微波光子移相器设计。提出了一种基于双平行马赫曾德尔调制器和可调谐检偏器的大带宽微波光子移相器设计方案,在保证强度输出不变的情况下实现360°全范围移相,同时移相器的低频工作带宽得到了显著的提升,可以运用于2~26.5GHz和4~40GHz的电子对抗系统中。(3)大带宽微波光子移相器的抖动抑制。通过分析找出了导致移相器幅值和相位抖动的原因:电桥的幅值和相位不平衡。并提出了相应的决解方案:加入光滤波器滤除由于电桥幅值和相位不平衡引起的高频残余边带。最后实验实现了移相器在4~40GHz频率范围内从-180°~+180°移相的过程中,相位波动从±12°下降到了±3.8°。
[Abstract]:Microwave photonics mainly studies the interaction between optical signals and microwave signals, including optical devices operating in microwave frequency band and the application of microwave instruments in optical systems. Compared with the traditional microwave signal processing technology, microwave photonics has a broad application prospect, which is mainly because the signal processing technology has the advantages of large bandwidth, low loss and strong ability to resist electromagnetic interference. In this paper, the microwave photon filters and microwave photon phase shifters are discussed, which are composed of the following parts: (1) the design of high precision microwave photon notch filters with flat group delay. Firstly, the reason that affects the delay of microwave photonic filter group is found out by theoretical analysis: whether the impulse response distribution of the filter is symmetric or not. Then, simulation and experiment verify this conclusion. Finally, a notch microwave photonic filter is implemented. The amplitude jitter of the filter in the pass band is very small, and the notch depth of 40 d Bm, group delay jitter is not greater than the design of the multiband microwave photon phase shifter with a range of 25 PS. (2). A design scheme of microwave photon phase shifter with large bandwidth based on double parallel Mach Zehnder modulator and tunable polarizer is presented in this paper, which can realize 360 掳full range phase shifter under the same intensity output. At the same time, the low frequency bandwidth of the phase shifter has been greatly improved, which can be used in the electronic countermeasure system of 2~26.5GHz and 4~40GHz. (3) the jitter suppression of the microwave photon phase shifter with large bandwidth. The reasons for the amplitude and phase jitter of the phase shifter are analyzed: the imbalance between the amplitude and the phase of the bridge. The corresponding decision scheme is put forward: the optical filter is added to filter the high frequency residual sideband caused by the unbalanced amplitude and phase of the bridge. Finally, the phase shift of the phase shifter from-180 掳to 180 掳in the frequency range of 4~40GHz is realized, and the phase fluctuation decreases from 卤12 掳to 卤3.8 掳.
【学位授予单位】：暨南大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN713;TN623

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