Abstract

A high-sensitivity curvature sensing configuration is implemented by using a fiber Mach-Zehnder interferometer (MZI) with D-shaped fiber Bragg grating (FBG). A segment of D-shaped fiber is fusion spliced into a single mode fiber at both sides, and then a short FBG is inscribed in the D-shaped fiber. The fiber device yields a significant spectrum sensitivity as high as 87.7 nm/m⁻¹ to the ultralow curvature range from 0 to 0.3 m⁻¹, and can distinguish the orientation of curvature experienced by the fiber as the attenuation dip producing either a blue or red wavelength shift, by virtue of the asymmetry of D-shaped fiber cladding. In addition, by tracking both resonant wavelengths of the MZI and embedded FBG, the temperature and curvature can be measured simultaneously.

© 2017 IEEE

Up-taper-based Mach–Zehnder interferometer for temperature and strain simultaneous measurement

Zexin Kang, Xiaodong Wen, Chao Li, Jiang Sun, Jing Wang, and Shuisheng Jian
Appl. Opt. 53(12) 2691-2695 (2014)

Asymmetrical in-fiber Mach-Zehnder interferometer for curvature measurement

Bing Sun, Yijian Huang, Shen Liu, Chao Wang, Jun He, Changrui Liao, Guolu Yin, Jing Zhao, Yinjie Liu, Jian Tang, Jiangtao Zhou, and Yiping Wang
Opt. Express 23(11) 14596-14602 (2015)

In-line Mach-Zehnder interferometer and Bragg grating integrated by femtosecond laser for discrimination of temperature and directional torsion

Wenqing Yang, Tianhao Wu, Zhifang Wu, Xicheng Wang, Perry Ping Shum, Xiaoyan Wang, Zhiyuan Wang, and Jixiong Pu
Opt. Express 30(23) 41933-41942 (2022)

Simultaneous measurement of temperature and curvature using ring-core fiber-based Mach-Zehnder interferometer

Weihao Yuan, Qiancheng Zhao, Lingduo Li, Yu Wang, and Changyuan Yu
Opt. Express 29(12) 17915-17925 (2021)

Temperature and strain simultaneous sensing measurement based on an all-fiber Mach-Zehnder interferometer and fiber Bragg grating

Junjie Zhu, Wei He, Shaode Li, Zhihan Li, and Lianqing Zhu
Appl. Opt. 62(25) 6661-6671 (2023)