Liu Chuanxu, Zhang Meng, Zhang Hui, Yang Jiuru, Shang Qinghai, Yang Xiaotong, Wang Shuai, Ran Lingling
Opt Express. 2022 Feb 14;30(4):6341-6354. doi: 10.1364/OE.450091.
An in-line Mach-Zehnder interferometer based on a multimode-fiber-assisted tapered open-cavity (TOC) is proposed. Light field distributions of the TOC were investigated using beam propagation method with different offsets and diameters of the taper waist. Bias and uniform taper (BT and UT)-based structures were fabricated and compared using one- and two-step arc-discharge methods, and comprehensive tests were then conducted considering axial-strain. The experimental results show that the UT structure has more than -45 pm/µɛ linear wavelength shift with the applied axial-strain. Owing to its compact size and low cost, the proposed sensor is promising for axial-strain-related high-precision engineering applications.
