An experimental analysis on the performance of single mode-multimode-single mode and multimode- single mode-multimode fiber optic sensor

A cost effective and simple fabrication process for Mach Zehnder Interferometer (MZI) fiber based sensor has been proposed based on single mode-multimode-single mode structure and multimode-single mode-multimode. These proposed structures employed a standard fusion arc splicing by varying the lengths of sensing region instead of the structures. This sensor has been experimentally demonstrated for three different liquid solutions such as water, 1mol sucrose solution and oil with the refractive index of 1.333, 1.384 and 1.464 respectively. Furthermore, the intention of this experiment was to determine which structure that would provide superior performance in terms of the sensitivity of the device. The operating wavelength of different structures was corresponded to the different refractive index. It was observed that the shifting response was influenced by the length of the sensing-area and the best sensitivity achieved was -10.45nm/RIU.