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We have recently reported azobenzene-coated fiber Bragg grating (FBG) for ultraviolet (UV) sensor. In this paper, we introduce an etched FBG for the strain sensitivity enhancement of the UV fiber grating sensors, which is inversely proportional to the fiber diameter. The sensitivity of the etched FBG with a diameter of ~60 m is improved to be greater than twice of the original 125 m fiber. In addition, the sensor system designed on the basis of the round-trip configuration can be used for many practical sensing applications in the field.

In this study, we proved that the phase component of the Fourier transform is more reliable and precise than the amplitude component of the transform for differential mode group delay measurement by optical spectral domain reflectometry.

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