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采用实验观测与理论模拟相结合的方法对“一”字型保偏光纤进行了研究。对保偏光纤的应力区与芯区的形状进行了观测,获得了它们的实际几何形状。在此基础上运用有限元方法分析了“一”字型保偏光纤内的热应力分布,解释了光纤芯区形变的原因,得到了由于热应力引起的光纤横截面的双折射的分布,并与相同应力区厚度的熊猫型保偏光纤进行了对比。实验结果表明,“一”字型保偏光纤采用熊猫型保偏光纤1/5的应力区面积便能获得较高的应力双折射。同时,通过研究径向压应力与温度变化对“一”字型保偏光纤应力双折射的影响,得到了光纤能稳定工作的压应力与温度环境。
The method of combining experimental observation with theoretical simulation was used to study the “one” shape PM fiber. The stress zone and core shape of PM fiber were observed, and their actual geometries were obtained. On this basis, the finite element method is used to analyze the thermal stress distribution in the “a ” shape PM fiber, the reason of fiber core deformation is explained, and the birefringence distribution of the fiber cross section due to thermal stress is obtained , And compared with the panda-type polarization maintaining fiber of the same stress zone thickness. The experimental results show that the higher stress birefringence can be obtained by using the area of the stress zone of the Polaroid Polarization-Maintaining Fiber (1/5) for the Polaroid fiber. At the same time, by studying the influence of radial compressive stress and temperature changes on the stress birefringence of the “1” -shaped word-type polarization maintaining fiber, the compressive stress and temperature environment with stable operation of the optical fiber are obtained.