Abstract

We report a novel fiber-optic interferometer based on Mach–Zehnder interferometer (MZI) from a bent single-mode fiber (SMF) and experimentally demonstrated that it can be used as a fiber-optic refractometer. The interferometer has a simple structure including a standard SMF with a bare fiber semicircular bending region of a given diameter. A fiber MZI is formed by the different optical paths taken by the core and cladding modes from the designed bending fiber structure. We also realize a dual-channel interferometer by using a 9 and 11 mm bending diameter fiber structure and measure the refractive index of the ambient environment by monitoring the wavelength shift of the resonance dips in its transmission spectrum. Additionally, we investigate the relationship between the wavelength shifts of the resonant dips with temperature changes. This dual-channel interferometer can be potentially used for simultaneous measurement of dual chemical parameters.

© 2015 IEEE

Bent-fiber intermodal interference based dual-channel fiber optic refractometer

Xinpu Zhang and Wei Peng
Opt. Express 23(6) 7602-7610 (2015)

Optimization of long-period grating-based refractive index sensor by bent-fiber interference

Xinpu Zhang, Lingxiao Xie, Yang Zhang, and Wei Peng
Appl. Opt. 54(31) 9152-9156 (2015)

Refractometer based on fiber Mach-Zehnder interferometer composed of two micro bending cores

Yiwei Ma, Yang Yi, Xiaoyang Li, Chunbo Su, Min Zhang, Tao Geng, Weimin Sun, and Libo Yuan
Opt. Express 29(20) 31443-31454 (2021)

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)

Highly sensitive displacement sensor based on composite interference established within a balloon-shaped bent multimode fiber structure

Ke Tian, Gerald Farrell, Xianfan Wang, Elfed Lewis, and Pengfei Wang
Appl. Opt. 57(32) 9662-9668 (2018)