Journal of the Korean Physical Society

pISSN 0374-4884 eISSN 1976-8524


J. Korean Phys. Soc. 2020; 76(9): 810-818

Published online May 15, 2020

Copyright © The Korean Physical Society.

Bend-Insensitive Simultaneous Measurement of Strain and Temperature based on Cascaded Long-Period Fiber Gratings Inscribed on a Polarization-Maintaining Photonic Crystal Fiber

Do Kyung Kim1, Seul-Lee Lee1, Sungwook Choi1, Min Seok Kim1, Jihoon Kim2, Jinsil Han2, Yong Wook Lee1,2

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


(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.


Optical fiber device, Long-period fiber ,grating, Polarization-maintaining photonic crystal fiber, Birefringence, Polarization