9 May 2012 A novel highly birefringent fiber loop mirror sensor based on a 3×3 coupler
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In this work, a novel high birefringent (HiBi) fiber loop mirror sensor based on a "figure-of-eight" constructed with a 3×3 fiber coupler, is presented. The "figure-of-eight" is formed by two fiber loop mirrors (FLM's) made by four of the six fiber arms of the 3×3 fiber coupler. The other two remaining fiber ports of the 3×3 coupler are used as input and output fibers of the compound sensor. The sensing head is located in the one of the FLM and it is formed by a spliced section of HiBi elliptical core fiber. The spectral response of this "figure-of-eight" configuration presents two interference optical signals that can be easily tuned by a polarization controller that is located in the other FLM, and which is made only of standard singlemode fiber from two arms of the 3×3 coupler. The sensor head was optically characterized both in temperature and strain, showing wavelength dependence sensitivities of -0.23 nm/°C and - 2.6 pm/με, for temperature and strain, respectively. It is noticed that these sensitivities are practically the same for the two interference signals. Future work will explore the possibility to use the singlemode FLM to interrogate the sensor head made by HiBi fiber section, and providing elimination of phase fluctuations that can occur, increasing its potential for remote sensing applications.
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R. M. Silva, R. M. Silva, A. B. Lobo Ribeiro, A. B. Lobo Ribeiro, J. L. Santos, J. L. Santos, O. Frazão, O. Frazão, } "A novel highly birefringent fiber loop mirror sensor based on a 3×3 coupler", Proc. SPIE 8439, Optical Sensing and Detection II, 84390L (9 May 2012); doi: 10.1117/12.922827; https://doi.org/10.1117/12.922827

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