Polarization-dependent refractive index fiber-optic sensor based on the core-offset with a taper

5th International Conference on Advances in Optoelectronics and Micro/Nano-optics

Wang, Youqing^1 ; Shen, Changyu^1 ; Lou, Weimin^1 ; Shentu, Fengying^1

Institute of Optoelectronic Technology, China Jiliang University, Hangzhou

310018, China^1

关键词: Biochemical sensing;    Enhancing effect;    Fast axis;    Fusion splicing;    Low costs;    Orthogonal polarization modes;    Refractive index sensor;    Slow-axis;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/680/1/012023/pdf
DOI  :  10.1088/1742-6596/680/1/012023

来源: IOP

【 摘 要 】

A polarization-dependent refractive index sensor based on the in-fiber Mach- Zehnder interferometer which is constructed by core-offset fusion splicing a tapered polarization maintaining fiber (PMF) with a length of 20 mm between the core-offset and the taper is proposed. Due to the introduced high environment-sensitivity of the two orthogonal polarization modes in the PMF and the enhancing effect of the tapered PMF, The sensitivity of the fast axis and the slow axis up to ∼-107.51 nm/RI and ∼-74.54 nm/RI in the RI range between 1.333 and 1.381 is obtained, respectively. Such kinds of low-cost and highly sensitive fiber-optic RI sensors would find applications in chemical or biochemical sensing fields.