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中文摘要：
设计了一种基于双折射效应的新型矩形纤芯光子晶体光纤偏振分柬器，通过在矩形晶格结构的光子晶体光纤的每个纤芯中引入一对椭圆来增加结构的双折射。应用全矢量有限元法（FEM）分析了双芯光子晶体光纤中结构参数对双折射和耦合长度特性的影响，数值模拟了该偏振分柬器的性能。结果表明：增大椭圆率可以在增大结构的双折射的同时减小耦合长度，并且该分束器在工作波长为1．55μm、传输长度为282μm的光纤中能够实现偏振状态的隔离，消光比达到最小值-45．42dB，并且在1．507-1．596μm、带宽为89nm的范围内消光比小于-10dB。
英文摘要：
Based on the birefringence effect, a novel duel-core photonic crystal fiber polarization beam splitter was proposed. The birefringence of the splitter was improved by introducing dual elliptical air holes into each fiber core of the rectangle lattice structure photonic crystal fiber. Using the full-vector finite element method （FEM）, the impacts of structural parameters of duel-core photonic crystal fiber on birefringence and coupling length were analyzed. And the characteristics of the splitter, such as coupling length, extinction ratio and bandwidth, were investigated. Numerical simulation results demonstrate that the coupling length is decreased while the birefringence is increased by increasing the ellipticity, and the isolation of the polarization state can be achieved and the polarized light extinction ratio is -45.4.2 dB when the working wavelength and transfer-length of the fiber are 1.55 p,m and 282 μm, respectively. Besides, the extinction ratio is less than -10 dB when the bandwidth is 89 nm as well as the range of the wavelength is 1.507-1.596 μm.
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