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Model of an axially strained weakly guiding optical fiber modal pattern

机译:轴向应变的弱导光纤模态模式模型

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Abstract: Axial strain may be determined by monitoring the modal pattern variation of an optical fiber. In this paper we present the results of a numerical model that has been developed to calculate the modal pattern variation at the end of a weakly guiding optical fiber under axial strain. Whenever an optical fiber is under stress, the optical path length, the index of refraction and the propagation constants of each fiber mode change. In consequence, the modal phase term, $beta$-in$/z, of the fields and the fiber output pattern are also modified. For multimode fibers, very complicated patterns result. The predicted patterns are presented and an expression for the phase variation with strain is derived.!25
机译:摘要:轴向应变可以通过监视光纤的模式模式变化来确定。在本文中,我们介绍了一个数值模型的结果,该数值模型已被开发出来,用于计算轴向应力作用下的弱导光纤末端的模式模式变化。每当光纤受到应力时,每种光纤模式的光程长度,折射率和传播常数都会发生变化。结果,场的模态相位项$ beta $ -in $ / z也被修改。对于多模光纤,会产生非常复杂的图案。给出了预测的模式,并推导了随应变变化的相位表达式!25

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