Ian Yulianti, Ngurah Made Darma Putra, Fianti, Zunita Aryani Fahma Latif, Kukuh Eka Kurniansyah
This study characterized Mach-Zehnder Interferometer-plastic optical fiber (MZI-POF) for refractive index sensor with temperature compensation. MZI-POF sensor fabrication was done by using heat-and-pull technique to reduce the diameter of POF at two points separated by 1 cm to form a two-taper MZI structure. The measurement was done by using intensity modulation technique with temperature compensation. Output intensities were observed at two wavelength pairs. Characterization of refractive index sensitivity was done by immersing MZI-POF in several glucose solutions with varying refractive indexes of 1.3330 to 1.3547 at room temperature. The light source used was blue LED light with a wavelength of 430 nm and bandwidth of 80 nm. Meanwhile, the characterization of temperature changes was done by placing MZI-POF in glucose solution with a refractive index of 1.3490 in a temperature chamber. The characterization results showed the refractive index sensitivity of the POF-MZI sensor at the transmittance ratio of λ1/λ5 is 4.2986 / RIU with correlation coefficient of 97.16%. Meanwhile, for λ3/λ5 it has a sensitivity value of 2.8793 / RIU with a correlation coefficient of 97.64%. The sensitivity of the POF-MZI sensor to the temperature at wavelength ratio of λ1/λ5 and λ3/λ5 are 0.0026 /°C and 0.0014 /°C, respectively. By using the four sensitivity values at two wavelength pairs, temperature effect could be eliminated, and the sensor accuracy could be improved. © 2023 Author(s).
Department of Physics, Faculty of Mathematics and Natural Science, Universitas Negeri Semarang, Semarang, Indonesia
