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为降低双折射多孔光纤偏振拍长的波长敏感性,制作宽带稳定的光纤偏振器件,提出一种包层空气孔呈矩形阵列分布的多孔光纤包层结构设计方案,在包层中引入具有不同双折射变化趋势的非对称性结构,采用全矢量波束传播法并考虑熔融石英的材料色散,计算分析了不同结构参数对偏振拍长稳定性的影响。研究结果表明,这种多孔光纤的包层结构降低了偏振拍长的波长敏感性,在1.26~1.60μm波长范围内,偏振拍长的相对变化率小于±4%,达到制作光纤波片的宽带稳定性能要求;同时,优化后包层结构的几何参数具有较大的误差容限,进一步降低了制作工艺的难度。
In order to reduce the wavelength sensitivity of the birefringent porous optical fiber polarization beat length and fabricate a broadband stabilized optical fiber polarization device, a design scheme of a porous optical fiber cladding structure with cladding air holes distributed in a rectangular array is proposed. In the cladding layer, The influence of different structural parameters on the stability of polarization length of the polarizer was calculated by using the full vector beam propagation method and the material dispersion of fused silica. The results show that the cladding structure of the porous optical fiber reduces the wavelength sensitivity of the polarized beat length. The relative change rate of the polarized beat length is less than ± 4% in the wavelength range of 1.26 to 1.60 μm, Stability requirements; at the same time, the geometric parameters of the optimized cladding structure have greater error margin, further reducing the difficulty of the production process.