Type II fiber Bragg gratings (FBGs) inscribed with femtosecond ( f s) laser possess significant potential for high temperature sensing. In this work, we propose and demonstrate a method for fabrica…
We inscribe and characterize a series of helical intermediate-period fiber gratings (HIPFGs) on single-mode fiber with pitches from 24 μm to 48 μm. The fabricated HIPFGs have low temperature sens…
An effective method, reducing the material volume of the air cavity by asymmetrical tapering fiber, is demonstrated to enhance the sensitivity of the strain sensor dramatically. High-sensitive stra…