弯曲阶跃型光纤中光学涡旋的传输特性研究

研究了光学涡旋在光纤中传播特性。从Maxwell方程出发，推导光波导中的波动方程，并进行阶跃光纤传输的本征模式求解，根据光学涡旋模式(OAM模)和线偏振模式(LP模)与矢量模式之间的关系，解出光学涡旋以及线偏振模在光纤中的模式分布，理论分析了光学涡旋在光纤中较LP模的传播优势，并通过计算模拟其在弯折光纤中的传播过程，发现其光场强度空间分布具有周期性旋转特性。研究光纤弯曲半径以及涡旋拓扑荷对光学涡旋传播的影响。光纤弯曲半径越小，传输损耗越大；涡旋拓扑荷越大,传输损耗越大，对应的旋转周期越小。

Abstract

The propagation characteristics of optical vortices in fibers are studied. The wave equations in the optical waveguide based on the Maxwell′s equation are derived, and then the eigen modes of the step index fiber are solved. According to the relationship of the orbital angular momentum (OAM) and linear polarization (LP) modes with the vector modes， the distributions of optical vortices and linear polarization modes in fibers are solved and the advantage of optical vortices in fibers over the LP modes in theory are analyzed. The propagation of the optical vortices in bend fibers is simulated. It is found that the distribution of the optical field has periodic rotating properties. The effects of the fiber′s bending radius and the topological charge on the propagation of optical vortices are researched. The smaller the bending radius is, the greater loss in propagation is produced. The larger the topological charge is, the greater loss in propagation and the shorter rotating period is.

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孙喜博, 耿远超, 刘兰琴, 朱启华, 黄志华, 黄晚晴, 张颖, 王文义. 弯曲阶跃型光纤中光学涡旋的传输特性研究[J]. 光学学报, 2015, 35(s1): s106001. Sun Xibo, Geng Yuanchao, Liu Lanqin, Zhu Qihua, Huang Zhihua, Huang Wanqing, Zhang Ying, Wang Wenyi. Study on Propagation Characteristics of Optical Vortices in Bent Fibers[J]. Acta Optica Sinica, 2015, 35(s1): s106001.

弯曲阶跃型光纤中光学涡旋的传输特性研究

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