Abstract

We proposed an analytical model to describe the relationship between the axial stress profile of a few-mode fiber Bragg grating with the variations in the resonant wavelengths during a chemical etching process. As a mechanism of preserving state of equilibrium, the etched fiber is experiencing a varying axial strain—contractive or expansive depending on the total axial stress over the remaining cross-sectional area of the fiber. It is found that the induced strain on the etched fiber is the main constituent to the blueshifts and redshifts in the resonant wavelengths during the etching process. The proposed model has been experimentally verified and the estimated axial stress profiles are in good agreement with the measurement by the polariscopic technique.

© 2017 Optical Society of America

Axial contraction in etched optical fiber due to internal stress reduction

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Formation of enhanced regenerated grating in few-mode fiber by CO₂ laser pretreatment

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Reflection spectra of etched FBGs under the influence of axial contraction and stress-induced index change

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Etching Bragg gratings in Panda fibers for the temperature-independent refractive index sensing

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