In this paper, we have investigated cryogenic temperature response of long-period fiber gratings (LPFGs) inscribed on
standard photosensitive single-mode fibers without any polymeric coatings. The resonance wavelength of the fabricated
LPFG, which was ~1530.778 nm at room temperature (296 K), was monitored under various temperatures ranging from
77 K to 296 K. The temperature sensitivity of the resonance wavelength was measured as ~402.4 pm/K, and the adjusted
R-square value of the linear fit of the temperature response curve was evaluated as 0.98144.
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