Bend-Insensitive Simultaneous Measurement of Strain and Temperature based on Cascaded Long-Period Fiber Gratings Inscribed on a Polarization-Maintaining Photonic Crystal Fiber
J. Korean Phys. Soc. 2020; 76: 810~818
Published online May 15, 2020 © 2020 The Korean Physical Society.


1Interdisciplinary Program of Biomedical Mechanical & Electrical Engineering, Pukyong National University, Busan 48513, Korea
2School of Electrical Engineering, Pukyong National University, Busan 48513, Korea
Correspondence to: Yong Wook Lee
Abstract
(a) Schematic diagram of the fabrication setup for cascaded long-period fiber gratings (LPFGs) on polarization-maintaining photonic crystal fiber (PMPCF), (b) side-view image of the fabricated grating, and (c) its polarization-dependent in-
fiber Mach-Zehnder interference spectra measured for orthogonal input polarization states denoted by polarizer angles of 0
° (red) and 90° (blue). The inset of (b) shows a cross-sectional image of the PMPCF. SIDs A and B are the two fringe dips used as sensor indicators. (d) Schematic diagram of the proposed sensor and wavelength shifts of SIDs A (red) and B (blue), measured for applied (e) strain and (f) temperature changes.
PACS numbers: 42.81.-i, 42.81.Wg, 42.79.Dj, 42.81.Gs
Keywords:
Optical fiber device, Long-period fiber grating, Polarization-maintaining photonic crystal fiber, Birefringence, Polarization


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