“…In recent years, optical fiber sensor has proven to be a powerful tool in many industrial and commercial applications due to their advantages of small size, excellent stability, high temperature resistance, and anti-electromagnetic interference [5,6]. Naturally, fiber optic sensors for the specific detection of UV light have also been developed through combining the advantages of wide band-gap semiconductors and optical fibers, which broadens the practicability of UV photodetectors significantly [7,8]. Zinc oxide (ZnO) is a kind of wide bandgap (≈3.37 eV) semiconductor with large exciton binding energy (≈60 meV), high transparency, and excellent UV absorption, so it has become one of the most ideal materials for UV detection [9].…”