ical model has been developed to calculate the modal phase shift of circular step index profile weakly guiding fibers under axial strain. Whenever an optical fiber is under stress, the optical path length, the index of refraction, and the propagation constants of each mode change. In consequence, the phase of each mode is also modified. A relationship for the modal phase shift is presented. This relation is applied to both single mode and two mode fibers in order to determine the sensitivity characteristics of strained fibers. It was found that the phase shift is strongly dependent on the core refractive index, n$- co$/. It was also found that it is possible to design fibers which are insensitive to axial strain. Practical applications of strain insensitive fibers are discussed.
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机译：已经开发了ICAL模型以计算轴向菌株下圆形步长折射率弱引导纤维的模态相移。每当光纤处于应力下，光路长度，折射率和每个模式变化的传播常数。结果，还修改了每个模式的阶段。呈现了模态移位的关系。该关系应用于单模和两个模式纤维，以确定应变纤维的灵敏度特性。发现相移强烈依赖于核心折射率，N $ - CO $ /。还发现，可以设计对轴向菌株不敏感的纤维。讨论了应变不敏感纤维的实际应用。
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