Axial strain insensitivity of weakly guiding optical fibers

Claudio Oliveira Egalon; Robert S. Rogowski

doi:10.1117/12.152201

1 February 1994 Axial strain insensitivity of weakly guiding optical fibers

Claudio Oliveira Egalon, Robert S. Rogowski

Author Affiliations +

Optical Engineering, Vol. 33, Issue 2, (February 1994). https://doi.org/10.1117/12.152201

Abstract

A numerical model was developed to calculate the modal phase shift of a circular step index profile 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 mode change. In consequence, the phase of each mode is alsomodified. A relationship for the modal phase shift is presented. This relation is applied to bpth single-mode and two-mode fibers 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 that are insensitive to axial strain. Practical applications of strain-insensitive fibers are discussed.

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Claudio Oliveira Egalon and Robert S. Rogowski "Axial strain insensitivity of weakly guiding optical fibers," Optical Engineering 33(2), (1 February 1994). https://doi.org/10.1117/12.152201

Published: 1 February 1994

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