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20 May 2013 Four-port microfiber long-period grating sensors
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Proceedings Volume 8794, Fifth European Workshop on Optical Fibre Sensors; 879421 (2013)
Event: Fifth European Workshop on Optical Fibre Sensors, 2013, Krakow, Poland
We demonstrate four-port long-period gratings formed by winding an optical microfiber with another thinner microfiber. The surrounding thinner microfiber not only induces a strong refractive-index perturbation in the center microfiber, but also collects and leads out the light resonantly coupled from the fundamental mode to high-order modes, providing flexibility for applications as optical filters and sensors. The devices exhibit temperature sensitivity of 7.6 pm/°C, strain sensitivity of -10.6 pm/μ(epsilon) and refractive-index sensitivity of 2012.6 nm/RIU.
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Li-Peng Sun, Jie Li, Long Jin, and Bai-Ou Guan "Four-port microfiber long-period grating sensors", Proc. SPIE 8794, Fifth European Workshop on Optical Fibre Sensors, 879421 (20 May 2013);

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