Comparison of Fiber Bragg Grating based on SMF and MMF over Temperature Sensitivity

Abstract

We have successfully fabricated and demonstrated a simple, cost-effective and easy to use of fiber Bragg grating (FBG) based on single mode, and multimode fiber which have been employed for temperature monitoring. The study purposely compared the performance of two types of FBGs; single mode FBG (SM-FBG) and multimode FBG (MM-FBG). The FBGs sensor is fabricated by phase mask technique which being exposed to ArF excimer laser with 20 mm uniform grating length and 99% reflectivity. The proposed FBG is studied for temperature monitoring starting at room temperature until 120 °C, and the configurations with SM-FBG and MM-FBG achieved a sensitivity of 10.9 pm/°C and 13.23 pm/°C, respectively whereas linear response correlation coefficient of 0.98229 and 0.99929. These show the MM-FBG has better sensitivity to be used in sensor applications.

A Micro-Mach–Zehnder Interferometer Temperature Sensing Design Based on a Single Mode–Coreless–Multimode–Coreless–Single Mode Fiber Cascaded Structure

“…Lim et al proposed a Sagnac interferometer, which is composed of two polarization-maintaining fibers, and its temperature sensitivity can reach 65.3 pm/°C [19]. Fiber Bragg grating sensors were fabricated by Osman et al to compare single-mode fiber grating and multimode fiber grating; these sensors were made with phase mask technology and had temperature sensitivities of 10.9 pm/°C and 13.23 pm/°C [20]. Special fiber optic sensors, such as those reported by Chaudhary V.S.…”