Micro-Tapered Fiber Few-Mode Interferometers Incorporated by Molecule Self-Assembly Fiber Grating for Temperature Sensing Applications

We demonstrate fiber few-mode interferometers based on a self-assembly surface corrugated grating using charged nano-particles. Initially, an abrupt taper (AT) was first created micro flame. The AT then further outwardly stretched to make elongated uniformed until the tapered diameter achieved micron scale. high order core modes (HOCMs) were excited at and optical path difference (OPD) among enlarged through achieve interference effects seen. However, significantly enhance with higher extinction ratios (ER) over such short length of interferometer, external assisted made nanoparticles form period, Λ, approximately 14 μm. This intermediate period helpful in scattering attenuating some unwanted high-order change characteristics interferometer (FMI). FMI (SAFG) used temperature sensors, maximum resonant wavelength shift 4.6 nm, range from 20–60 °C. sensitivity 112.6 pm/°C coefficient determination, R2, as 0.99, which revealed linearity results.