Abstract: Axial strain may be determined by monitoring the phase shift of a single mode optical fiber. 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 phase term, $beta$Zeta@, is also modified. In this paper, a relationship for the phase shift, due to axial strain, of the hybrid modes HE$-1n$/ and EH$-1n$/ is presented using the exact field solution. This relation is applied to single mode fibers in order to determine phase sensitivity characteristics. !20
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