Highly sensitive bend sensor with hybrid long-period and tilted fiber Bragg grating

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• 作者：Li-Yang Shao ; Albane Laronche ; Mateusz Smietana ; Predrag Mikulic ; Wojtek J. Bock ; Jacques Albert
• 关键词：Long period grating ; Tilted fiber Bragg grating ; Cladding mode recoupling ; Bend sensor ; Curvature measurement
• 刊名：Optics Communications
• 出版年：2010
• 出版时间：1 July 2010
• 年：2010
• 卷：283
• 期：13
• 页码：2690-2694
• 全文大小：1502 K

文摘

We demonstrate a new type of fiber optic bend sensor with a hybrid structure made up of a long period grating (LPG) and a tilted fiber Bragg grating (TFBG). The sensing mechanism is based on the spectrum of power transfers between the core and cladding modes from a TFBG located downstream from a LPG. We show that the curvature of a beam can be determined by the reflected power difference between the core mode and the recoupled cladding modes. We further provide design rules for the LPG and TFBG to optimize and linearize the sensor response. In addition, the temperature cross-sensitivities of this configuration are also investigated for two different types of fiber.