对光纤熔锥耦合器拉制过程中的偏振调制效应作了定性的理论分析,耦合区内的几何双折射和应力双折射导致的对称模和反对称模在x偏振方向和y偏振方向上的传播常数差不一致,从而引起两个方向的偏振光耦合的空间周期不同,存在相位差别,当相差正好达到π时实现偏振分离.在此基础上制作了熔锥型偏振分束器,消光比达到了16.5dB.
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