Abstract

A highly sensitive optical fiber curvature sensor based on cascaded fiber interferometers (CFIs) is demonstrated theoretically and experimentally. Theoretical results show that the scheme of cascaded fiber interferometers can be regarded as an equivalent fiber interferometer with longer interference length and narrower FSR. It serves as a curvature sensor with sensitivity up to 4.362 nm/m⁻¹ within the measurement range of 0–1.134 m⁻¹. Compared to the single fiber modal interferometer, the curvature sensitivity of the CFI is almost doubled. In addition, simultaneous curvature and temperature measurement is achieved using the coefficient matrix method, eliminating the issue of temperature cross sensitivity.

© 2017 IEEE

Highly sensitive vector curvature sensor based on a triple-core fiber interferometer

Shaoxian Zhang, Ai Zhou, Huiyong Guo, Yujia Zhao, and Libo Yuan
OSA Continuum 2(6) 1953-1963 (2019)

Highly sensitive curvature fiber sensor based on an enhanced core diameter mismatch

Yiwei Ma, Min Zhao, Tao Geng, and Libo Yuan
Opt. Express 31(1) 21-30 (2023)

Highly sensitive curvature sensor based on a sandwich multimode fiber Mach–Zehnder interferometer

Xiangwen Yang, Binbin Luo, Decao Wu, Junhao Fan, Hong Gu, Yilin Guo, and Mingfu Zhao
Opt. Express 30(22) 40251-40264 (2022)

Experimental study of an intensity-modulated curvature sensor with high sensitivity based on microstructured optical fiber

Zhiyong Yin, Xili Jing, Kaifeng Li, and Biao Wu
Opt. Express 31(3) 4770-4782 (2023)

Highly sensitive optical fiber curvature sensor based on a seven-core fiber with a twisted structure

Weijuan Chen, Zhihao Chen, Yishen Qiu, Lingxin Kong, Hanqing Lin, Chuanzheng Jia, Huibin Chen, and Hui Li
Appl. Opt. 58(32) 8776-8784 (2019)