Abstract

Transmission characteristics of microtapered long-period fiber gratings (MTLPGs) and their strain and temperature sensitivities with variations in the waist diameters are investigated theoretically and experimentally. Transmission characteristics of MTLPGs strongly depend on the waist diameter of the tapered optical fiber (TOF) because of the modification of the effective index difference between the core and the cladding modes. Based on the photoelastic effect, the resonant wavelengths of MTLPGs with variations in strain shift to shorter wavelengths. The strain sensitivity of the MTLPG with a waist diameter of 25 μm is improved by a factor of 20 compared with that of a 125 μm long-period fiber grating. The temperature sensitivities of MTLPGs are also enhanced by reducing the waist diameter of the TOF.

© 2013 Optical Society of America

Strain-insensitive and high-temperature long-period gratings inscribed in photonic crystal fiber

Yinian Zhu, Ping Shum, Hui-Wen Bay, Min Yan, Xia Yu, Juanjuan Hu, Jianzhong Hao, and Chao Lu
Opt. Lett. 30(4) 367-369 (2005)

Resonance-temperature-insensitive phase-shifted long-period fiber gratings induced by surface deformation with anomalous strain characteristics

Yinian Zhu, Ping Shum, Xiaoyan Chen, Ching-Hwee Tan, and Chao Lu
Opt. Lett. 30(14) 1788-1790 (2005)

Design and analysis of long-period fiber gratings in tapered multimode chalcogenide glass fiber for temperature measurement

Leilei Wang, Wenqiang Ma, Peiqing Zhang, Dandan Yang, Liang Zhu, Xunsi Wang, and Shixun Dai
J. Opt. Soc. Am. B 36(7) 1792-1798 (2019)

Highly sensitive long-period fiber-grating strain sensor with low temperature sensitivity

Yi-Ping Wang, Limin Xiao, D. N. Wang, and Wei Jin
Opt. Lett. 31(23) 3414-3416 (2006)

Simultaneous measurement of temperature and strain using dual long-period fiber gratings with controlled temperature and strain sensitivities

Young-Geun Han, Sang Bae Lee, Chang-Seok Kim, Jin. U. Kang, Un-Chul Paek, and Youngjoo Chung
Opt. Express 11(5) 476-481 (2003)