Abstract
We studied the influence of axial strain on the spectral properties of torsional acousto-optic (AO) gratings induced in a form-birefringence optical fiber. The experimental results illustrate that the spectral position of the main resonance peak is red-shifted with increasing axial strain, which is explained by the strain-induced changes in acoustic and optical properties of the fiber. The measured slope of the resonance shift under the strain variation is 5.2 nm/%, which is compared with those of other fiber-based AO gratings, e.g., flexural and torsional AO gratings formed in a standard single-mode fiber and a stress-induced highly-birefringent (HB) optical fiber. We highlight that the torsional AO gratings induced in a form-birefringence fiber show the lowest axial strain-dependence (and thus, the lowest environmental sensitivity) among all three considered cases, which is desirable for robust, stable device operation in optical sensing and communication systems.
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Kim, I., Lee, K.J. Axial strain dependence of torsional acousto-optic gratings induced in a form-birefringence optical fiber. Journal of the Korean Physical Society 67, 465–471 (2015). https://doi.org/10.3938/jkps.67.465
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DOI: https://doi.org/10.3938/jkps.67.465