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本文分析了宽带分路器中双折射现像对偏振相关损耗(PDL Polarization dependentlos)s的影响,结果发现:1)分路器的直通臂和耦合臂的偏振相关损耗相同;2)随制备分路器的拉伸速度的增大,1310nm波长的偏振相关损耗与1550nm波长的偏振相关损耗的变化曲线有一交叉点;3)在小于交叉点的范围内,由于双折射效应,使1310nm光的偏振相关损耗小于1550nm光的偏振相关损耗。4)在大于交叉点范围内,由于分路器内的拉伸应力做用,1310nm光的偏振相关损耗明显增大,1550nm光的偏振相关损耗平稳减小;5)发现在交叉点处偏振相关损耗最小,我们从大量的实验数据得出制备50%分光单模双窗分路器的最佳熔融拉伸速度为0.25±0.05mm/s。
In this paper, the influence of birefringence on the PDL Polarization dependentlos s is analyzed. The results show that: 1) the polarization-dependent loss of the direct arm and the coupled arm of the splitter is the same; 2) An increase in the tensile speed of the router, an intersection of the polarization-dependent loss of the 1310 nm wavelength and the polarization-dependent loss of the 1550 nm wavelength; 3) the polarization of the 1310 nm light due to birefringence within a range less than the cross point The related loss is less than the polarization-dependent loss of light at 1550 nm. 4) In the area beyond the crossover point, due to the tensile stress in the splitter, the polarization-dependent loss of 1310nm light obviously increases and the polarization-dependent loss of 1550nm light steadily decreases. 5) The polarization-dependent correlation at the cross point is found The least loss, we draw from a large number of experimental data to prepare a 50% split single-mode double-window splitter, the best melt drawing speed of 0.25 ± 0.05mm / s.