Study on the characteristics of novel optical phased array based on wave-guide
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摘要: 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，LiNbO3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LiNbO3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LiNbO3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。Abstract: A novel scheme of optical phased array(OPA) based on wave-guide was represented in this paper. Fiber paths was main design of system, the single mode fibers were used as transmission paths, photonic crystal fibers(PCF) were adopted as the output array, LiNbO3 wave-guide was used as the phase modulator. The system configuration was given, performance of main device such as LiNbO3 wave-guide and PCF array were analyzed. According to the theory of OPA and electro-optical effect of LiNbO3 wave-guide, the feasibility of system had been demonstrated. By adjusting the phase shift of each LiNbO3 wave-guide, the beam deflection had been observed. Simulation experiments had been implemented to study the influence of its structure parameter on output diffraction characteristics. The results show that the inter-elements distance, the quantity of fiber core and arrangement of fiber core affect the beam scanning quality including Full Width at Half-Maximum(FWHM), output intensity distribution.
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Key words:
- OPA /
- PCF /
- LiNbO3 wave-guide /
- beam steering
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