光纖耦合光波導相控陣光束優(yōu)化方法研究
[Abstract]:Optical waveguide optical phased array devices have the characteristics of low driving voltage, low power consumption and fast response speed (ns). It is one of the important development directions of optical phased array in the future. Due to the limitation of fabrication technology of optical waveguide array devices, there are some defects in array devices (such as the thickness of waveguide core layer is inconsistent, the refractive index is not uniform, etc.). After the beam is propagated through the optical waveguide array, the main lobe of the outgoing beam deviates from the calculated position, and the sidelobe strength is high, which has a great influence on the far-field scanning detection. The existing optical components and information processing systems are becoming more and more integrated and miniaturized. The integrated packaging of optical waveguide arrays and optical fibers will not only improve the efficiency of laser power utilization, but also reduce the volume of the system. Improve system stability. However, there are few reports on the theory of fiber-coupled optical waveguide phase-control. The main work of this thesis is to study the coupling characteristics of optical fiber beam and waveguide array, to explore the method of improving the output beam quality of optical waveguide phased array, and to realize high precision and low sidelobe beam scanning. It provides theoretical and experimental guidance for improving the performance of optical waveguide phased array. In the practical system, the laser beam is coupled to the end surface of the waveguide array through a single mode fiber, while the fundamental mode electric field distribution of the single mode fiber is a zero-order Bessel function, and the incident light field can be represented by the Gao Si distribution. In this paper, based on the traditional theory of plane wave optical phased array beam analysis, and based on the theory of planar waveguide and waveguide coupling, under the incident of parallel beam and Gao Si beam, The relationship between optical power and far-field distribution with waveguide length in optical waveguide devices is analyzed. The far-field distribution of 15-layer optical waveguide array with different distance between fiber and waveguide array under Gao Si beam is simulated and analyzed. The effect of different distances on the far field distribution is verified by experiments. When the distance reaches a certain distance, the far field distribution is consistent with the far field distribution under the incident of parallel light. The experimental results show that due to the defects of the devices produced by the waveguide array fabrication process, the deflection angle of the actual beam is not only large but also the deflection range is small according to the uniform power supply scheme of the waveguide array. Aiming at this problem, the output beam optimization is carried out based on the mode search method, and the charging voltage with high diffraction efficiency and low normalized precision error is obtained. The simulation results show that the diffraction efficiency is improved obviously and the normalized precision error is improved for the optimized voltage of the waveguide array. The experimental results after loading the optimized voltage for waveguide array show that for 1064nm pulse laser, the beam scanning range is 20g, the scanning angle error is less than 5.2mrad, the half peak width of far lobe is 2.02g, and the ratio of principal to sidelobe is up to 15db, but for 980nm continuous laser, Although can achieve 20? But the far-field FWHM is 4 渭 m, which is related to the performance parameters of the semiconductor laser used in the experiment.
【學位授予單位】:西安電子科技大學
【學位級別】:碩士
【學位授予年份】:2016
【分類號】:TN252
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