Simulation and Performance Evaluation of Fiber Optic Sensor for Detection of Salinity in Prawn Pond Application

The captivity and aquaculture in Indonesia are very potential to be developed due to a lot of resources including marine and freshwater. The suitable water condition for the pond requires lower salt content than seawater around to 0.5 to 30 gram/liter. This study aims to determine the value of the wavelength of the light source that produces significant power losses so that the optical fiber can be used as a sensor to detect the salinity in the water. The method used in this study is a simulation method using the Lumerical MODE Solutions software. The parameters used in the simulation include the value of light source wavelength, length, and diameter of cladding and concentration value of pond water solution from 0.5% to 3% (5000 ppm to 30000 ppm). The results show that the light wavelength of 1550 nm can generate significant power losses than 1310 nm so that it is more suitable for optical fiber sensors. Also, the higher value of the concentration of the salt solution the greater the power losses, because the value of electricity in the core-cladding limit is large. The sensor sensitivity value at a wavelength of 1550 nm is 2.26 × 10
^-6
Vm
^-1
/ppm was obtained.