Abstract

A novel Mach–Zehnder interferometer based on a fiber multimode interference structure combined with a long-period fiber grating (LPG) is proposed. The multimode interference is achieved through the use of a MMF section spliced between two single-mode fibers, with a length adjusted to couple a fraction of light into the cladding modes. A LPG placed after the MMF couples light back into the fiber core, completing the Mach–Zehnder interferometer. This novel configuration was demonstrated as a bending sensor.

© 2007 Optical Society of America

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)

All fiber compact bending sensor with high sensitivity based on a multimode fiber embedded chirped long-period grating

Shuo Zhang, Tao Geng, Huiwen Niu, Xiang Li, Yunxiang Yan, Cuiting Sun, Sifan Deng, Zemin Wang, Shengjia Wang, Wenlei Yang, Weimin Sun, and Libo Yuan
Opt. Lett. 45(15) 4172-4175 (2020)

Mach–Zehnder interferometer formed in a photonic crystal fiber based on a pair of long-period fiber gratings

Jong H. Lim, Hyun S. Jang, Kyung S. Lee, Jin C. Kim, and Byeong H. Lee
Opt. Lett. 29(4) 346-348 (2004)

Optical inclinometer based on a single long-period fiber grating combined with a fused taper

O. Frazão, R. Falate, J. L. Fabris, J. L. Santos, L. A. Ferreira, and F. M. Araújo
Opt. Lett. 31(20) 2960-2962 (2006)

Mach–Zehnder-Sagnac interferometric curvature sensor based on polarization-maintaining multi-mode fiber using a specified core offset

Juan Ruan, Haiping Li, and Jianfeng Zhu
J. Opt. Soc. Am. A 39(9) 1599-1602 (2022)