基于熔融拉锥技术的双折射晶体包层型光纤偏振器的研究

Birefringent crystal-clad fiber-optic polarizer based on fused biconical taper

建立简单模型,推导了晶体包层型光纤偏振器消光比的表达式,分析了消光比随锥腰直径和晶体包层长度的变化关系。兼顾锥腰光纤强度要求,对偏振器制作参数进行优化分析,并进行相应的实验研究。实验结果表明选择合适参数制作的偏振器,消光比优于30dB,损耗小于0.5dB,在-50℃^+70℃温度范围内消光比变化小于1.5dB,损耗变化小于0.5dB,具有很好的温度性能和稳定性。

A simple model was established,the polarization extinction ratio(PER)expression of cystal-clab fiber-optic polarizer was presented based on geometrical optics.The variation of the PER versus the diameter of biconical taper waist and the length of cladding was analyzed.Considering the intensity of biconical taper waist,the manufacturing parameters of polarizer were optimized and analyzed,corresponding experiment was carried out.The experiment verifies that the PER is more than 30 dB and its insertion loss(IS)is less than 0.5dB.The variation of the PER is less than 1.5dB and the variation of the IS is less than 0.5dB in the temperature range of-50℃^+70 ℃.This kind of polarizer is fine in tempreture performance and stability.