Highly Coupled Seven-Core Fiber for Ratiometric Anti-Phase Sensing
Natanael Cuando-Espitia, Andrés Camarillo-Avilés, Daniel A. May-Arrioja, Iván Hernández-Romano, Miguel Torres-Cisneros- Electrical and Electronic Engineering
- Biochemistry
- Instrumentation
- Atomic and Molecular Physics, and Optics
- Analytical Chemistry
A ratiometric fiber optic temperature sensor based on a highly coupled seven-core fiber (SCF) is proposed and experimentally demonstrated. A theoretical analysis of the SCF’s sinusoidal spectral response in transmission configuration is presented. The proposed sensor comprises two SCF devices exhibiting anti-phase transmission spectra. Simple fabrication of the devices is shown by just splicing a segment of a 2 cm long SCF between two single-mode fibers (SMFs). The sensor proved to be robust against light source fluctuations, as a standard deviation of 0.2% was registered in the ratiometric measurements when the light source varied by 12%. Its low-cost detection system (two photodetectors) and the range of temperature detection (25 °C to 400 °C) make it a very attractive and promising device for real industrial applications.