A compact vibration sensing probe, in which a short section of polarization-maintained (PM) fiber stub containing a normal straight fiber Bragg grating (FBG) is spliced to another single-mode fiber without any lateral offset, is proposed and experimentally demonstrated. Two groups of well-defined resonances with ∼ 7 nm wavelength separation have been achieved in reflection. Among them, the recoupled cladding modes at short wavelength side are extremely sensitive to fiber bending and provide the real-time vibration information by cost-effective power detection. Meanwhile, the unwanted power fluctuations and temperature perturbations can be referenced out by monitoring the core mode resonances at the longest wavelength.

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Conference 2012 Asia Communications and Photonics Conference, ACP 2012
Guo, T, Shang, L. (Libin), Liu, F. (Fu), Du, F. (Fa), Zhang, Z. (Zhaochuan), Guan, B. (Baiou), … Albert, J. (2012). Power-referenced and self-calibrated PM-FBG vibroscope. Presented at the 2012 Asia Communications and Photonics Conference, ACP 2012.