【摘要】 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。更多还原

【Abstract】 The"capsule"shape type polarization-maintaining optical fiber(PMOF) built by our country independently was investigated using theoretic simulation along with experimental observation.The real shapes of stress section and core were obtained by the measurement of the shape of stress section and core of campule PMOF.The thermal stress distribution and its contribution to birefringence were analyzed by finite element method.The cause of strain in core was explained,and the distribution of the birefringence along cross section due to thermal stress was calculated.The birefringence of PANDA type PMOF was calculated also for comparison,the results showed that the capsule PMOF with 1/5 area of stress section comparing with PANDA type PMOF can obtain much higher birefringence.Moreover,the effect on the birefringence from different compression stresses and temperature variation were investigated,the suitable stress and temperature circumstances was acquired.更多还原