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采用光纤作为传输链路,将光子晶体光纤作为系统的输出阵列,LiN bO 3波导作为相位调制器,构建了一种基于光纤光路的光波导光学相控阵。根据光学相控阵理论和LiN bO 3波导的电光效应,分析了系统的可行性,并研究了这种新型结构下的光波导光学相控阵的输出衍射特性和光子晶体光纤阵列结构参数的关系。研究结果表明通过控制施加在LiN bO 3波导上的电压可以改变出射光束的附加相位从而实现光束的偏转;光子晶体光纤阵列上的纤芯数量、纤芯间距以及纤芯的排列方式等结构参量会对系统的输出光束的光强分布、半峰值全宽度(FWHM)和归一化的振幅分布产生影响。随着光子晶体光纤制作工艺的不断发展,系统的光束扫描质量将会逐渐提高并且色散特性和传输特性将会获得改善,为今后这种光学相控阵系统的设计提供了理论基础和技术依据。
Using optical fiber as the transmission link, a photonic crystal optical fiber is taken as the output array of the system, and a LiNbO 3 waveguide is used as a phase modulator to construct an optical waveguide optical phased array based on a fiber optical path. The feasibility of the system is analyzed based on the optical phased array theory and the electro-optic effect of the LiNbO 3 waveguide. The relationship between the output diffraction characteristics of the optical waveguide optical phased array and the structural parameters of the photonic crystal fiber array under the novel structure is also studied . The results show that by controlling the voltage applied to the LiNbO 3 waveguide, the additional phase of the outgoing beam can be changed to achieve the deflection of the beam. The parameters such as the number of cores, the spacing of the cores and the arrangement of the cores on the photonic crystal fiber array It affects the light intensity distribution, full width at half maximum (FWHM) and normalized amplitude distribution of the output beam of the system. With the continuous development of photonic crystal fiber manufacturing technology, the quality of the system’s beam scanning will be gradually improved and the dispersion and transmission characteristics will be improved. This will provide the theoretical basis and technical basis for the design of this optical phased array system in the future.