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在理想的单模光纤中,HE_(11)~z模和HE_(11)~y模简并,传播常数相等,各自独立传播。光纤受外场扰动将使两模式失简并,相互产生耦合,使光波的偏振态发生变化。本文应用模耦合理论和弹光方程,建立单模光纤中偏振态与扭转扰动之间的关系,并且进行了实验研究。实验结果与理论分析基本相符。 实验研究表明,利用单模光纤偏振态的调制特性,设计出一种新的光纤扭转角传感器是有可能实现的。
In the ideal single-mode fiber, the HE_ (11) ~ z modes and the HE_ (11) ~ y modes are degenerate and have the same propagation constants and propagate independently. Fiber by the external disturbance will make the two models degenerate and coupled to each other, so that the polarization of light changes. In this paper, the relationship between polarization state and torsional disturbance in a single-mode fiber is established by using the theory of mode coupling and the extinction equation, and the experimental research is carried out. The experimental results are in good agreement with the theoretical analysis. Experimental results show that it is possible to design a new fiber optic torsion angle sensor by using the modulation characteristics of the polarization state of the single mode fiber.