Experimental demonstration of offset-induced sensitivity enhancement in SMS-based temperature and strain sensing
Kun Wang, Yosuke Mizuno, Heeyoung Lee, Xingchen Dong, Wolfgang Kurz, Maximilian C. Fink, Martin Jakobi, Alexander W. Koch
Abstract
Abstract A simple, inexpensive, and high-sensitivity temperature and strain sensor based on a single-mode–multimode–single-mode (SMS) structure with core offset is developed and experimentally characterized. This sensor does not require specialty fibers and can be fabricated using a standard fiber fusion splicer. The dependencies of the temperature and strain sensitivities on the core-offset amplitudes at the input and output single-mode/multimode fiber boundaries are investigated. The results indicate that the maximum temperature and strain sensitivities are two times and eight times higher than those of the standard SMS structure, respectively. The limit of the sensitivity enhancement by core offset is also revealed.