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We demonstrated femtosecond laser inscription of fiber Bragg gratings (FBGs) in a twin-core few-mode fiber (TC-FMF) for directional bend sensing. An FBG was selectively inscribed in one core of the TC-FMF by using an 800 nm femtosecond laser through a phase mask. Three resonance peaks at the wavelengths of 1549.05, 1547.65, and 1546.08 nm were observed in the reflection spectrum of the TC-FM FBG,...
We demonstrate a novel polyvinyl chloride (PVC) diaphragm-based fiber-tip Fabry-Perot interferometer for gas pressure measurements with ultra-high sensitivity. The PVC diaphragm has been coated to the end facet of a well-cut standard single-mode fiber by use of a plastic welder. Ultrahigh pressure sensitivity of ∼66.07 nm/MPa at 1565 nm and a low temperature cross-sensitivity of —5.5 KPa/°C have been...
A highly-birefringent phase-shifted fiber Bragg grating (PS-FBG) was inscribed with femtosecond laser and a uniform phase mask. The PS-FBG was fabricated from an ordinary FBG in case over exposure was applied. The spectral evolution from FBG to FS-FBG was observed in accompany with a decrease in transmission loss, a ‘blue’ shift of dip wavelength, a decrease in cladding mode loss, and an increase...
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