Multi-mode all Fiber Interferometer based on Fabry-Perot Multi-cavity and its Temperature Response
Abstract
We present the use of conventional arc discharge technique for manufacturing an optical fiber Fabry-Perot interferometer using hollow core photonic crystal fiber and conventional single-mode fiber. The interferometric structure is composed by several intrinsic Fabry-Perot cavities, here the excitation of several fiber optic modes generates a high frequency interference reflection spectrum with special properties such as a free spectral range of 0.1nm and visibility near to 6dB. Thermal analysis has been conducted to demonstrate a sensing application, hence several modal Fabry-Perot interferometers were immersed in liquid and controlled temperature increments were applied. The thermal variations show a linear phase shifting to a shorter wavelength. The analysis exhibits a sensitivity and resolution of 27pm/°C and 0.7°C respectively. The proposed fiber structure offers compactness, robustness, low-cost fabrication, simple manufacturing process and remote sensing operation. Moreover, it was demonstrated for real sensor applications: suitable sensitivity, good resolution, and long dynamic range.
- Publication:
-
Optik
- Pub Date:
- October 2017
- DOI:
- 10.1016/j.ijleo.2017.08.091
- Bibcode:
- 2017Optik.147..232L
- Keywords:
-
- Fiber optics sensors;
- Fabry-Perot interferometers;
- Hollow core photonic crystal fiber;
- Temperature sensing