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将两种分别具有正负双折射特性的缺陷结构相结合,在一定波长范围内,设计了一种拍长对波长变化不敏感的多孔双折射光纤。设计方案从均匀分布圆形微孔的光纤端面出发,将靠近中心的一对微孔的半径增大,同时将分布于包层中的其余微孔变为椭圆形状,在不同的波长上分别产生符号相反的模式双折射进行调节补偿。采用有限差分波束传播法计算分析了不同结构参数对多孔光纤双折射的影响,结果表明,调控这些结构参数能在特定的波长窗口获得稳定的拍长,且拍长值也可以根据实际需求设计调整。通过优化结构参数,在1310 nm波长窗口得到了带宽大于180 nm的平坦拍长曲线。
Combining two kinds of defect structures with positive and negative birefringence respectively, a kind of porous birefringent fiber whose beat length is insensitive to wavelength change was designed in a certain wavelength range. Design From the uniform distribution of circular micropores fiber end face, the diameter of a pair of micropores near the center increases, while the remaining micropores distributed in the cladding into an elliptical shape, respectively, at different wavelengths were generated Contrary to the pattern of birefringence adjustment compensation. The influence of different structural parameters on the birefringence of porous optical fiber was analyzed by finite difference beam propagation method. The results show that the control of these structural parameters can obtain a stable beat length in a specific wavelength window, and the length of the beat value can also be designed and adjusted according to actual needs . By optimizing the structure parameters, a flat beat curve with bandwidth greater than 180 nm is obtained in the 1310 nm wavelength window.