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Opt Lett. 2009 Sep 1;34(17):2622-4. doi: 10.1364/OL.34.002622.

Analytical solution of four-mode coupling in shear strain loaded fiber Bragg grating sensors.

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Institute for Measurement Systems and Sensor Technology, Technische Universität München, Theresienstrasse 90/N5, 80333 Munich, Germany.


The polarization-dependent reflection spectra of fiber Bragg grating (FBG) sensors in polarization-maintaining fibers are influenced by shear strain. This influence can be evaluated from a tensorial coupled-mode theory approach. Yet, this approach requires the numerical integration of the four coupled-mode equations. We present an easy to handle, completely analytical treatment of the polarization-dependent reflection spectra of FBGs. We derive the required equations and compare the results to the numerical integration of the four tensorial coupled mode equations.

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