Trenched No-core Fiber based Refractive Index Sensor

Tan Jin Wen; Fauzan Ahmad

Authors

Tan Jin Wen Advance Vehicle System (AVS), Electronic System Engineering, Malaysia-Japan International Institute of Technology, Universiti Teknologi Malaysia, Jalan Sultan Yahya Petra, Kampung Datuk Keramat, 54100 Kuala Lumpur, Malaysia
Fauzan Ahmad Advance Vehicle System (AVS), Electronic System Engineering, Malaysia-Japan International Institute of Technology, Universiti Teknologi Malaysia, Jalan Sultan Yahya Petra, Kampung Datuk Keramat, 54100 Kuala Lumpur, Malaysia

Keywords:

No-core fiber, COMSOL, sensor

Abstract

Refractive-index (RI) measurement of a substance is widely used in many applications such as monitoring environmental pollution, measuring the concentration of substances and determining the composition of the solution. The objective of this study is to evaluate the sensitivity of RI measurement using trenched no core fiber (trench-NCF) with different RI analyte ranges from 1.31-1.448. This work proposed a simulation of trench no core fiber sensor for evanescent study in exposing the trench-NCF in different RI analytes using COMSOL Multiphysics software. The fabrication process is implemented by splicing the two ends of the trench-NCF with two single-mode no-core fiber. Then, one end is connected to the amplified spontaneous emission (ASE) broadband source while the other end is connected to the optical spectrum analyzer (OSA) while testing different RI analyte. Data was retrieved from the OSA showing the dip wavelength increases in a non-linear pattern when RI increases. Linear fitting was applied to obtain the sensitivity of 148.06nm/RIU and 1626.1nm/RIU in the range of 1.310 RIU to 1.421 RIU and 1.412 to 1.448 RIU respectively. In the future, the results and simulations can be used as a reference in future study in implementing a fiber-optic based refractive-index sensor.