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Optical Engineering

Axial strain insensitivity of weakly guiding optical fibers
Author(s): Claudio Oliveira Egalon; Robert S. Rogowski
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Paper 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 also modified. 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 nco. 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.

Paper Details

Date Published: 1 February 1994
PDF: 4 pages
Opt. Eng. 33(2) doi: 10.1117/12.152201
Published in: Optical Engineering Volume 33, Issue 2
Show Author Affiliations
Claudio Oliveira Egalon, NASA Langley Research Ctr. (United States)
Robert S. Rogowski, NASA Langley Research Ctr. (United States)

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