Journal
JOURNAL OF LIGHTWAVE TECHNOLOGY
Volume 40, Issue 9, Pages 3031-3037Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2022.3144029
Keywords
Fiber Bragg gratings (FBGs); phase mask technique; femtosecond laser; CYTOP; with over-clad
Funding
- Fonds de la Recherche Scientifique-FNRS [T.0163.19 RADPOF]
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In this study, fiber Bragg gratings were inscribed in the over-clad of CYTOP optical fiber using a phase mask technique and a 400 nm femtosecond pulsed laser. The results showed that the temperature sensitivity of CYTOP-FBGs with the over-clad depended on the relative humidity, while CYTOP-FBGs without the over-clad had a temperature sensitivity of 26.7 pm/°C.
In this work, we report the inscription of fiber Bragg grating through the over-clad in cyclic transparent fluoropolymer (CYTOP) optical fiber using a phase mask technique and a 400 nm femtosecond pulsed laser. 8 mm-long grating were obtained in less than 20 s with 500 mu Waverage beam power. To investigate the FBG properties and discriminate between the protective over-clad influence and the core-cladding effect, we inscribe FBGs in the fiber with and without the over-clad. We also show that the temperature sensitivity of CYTOP-FBGs with the over-clad depends on the relative humidity, whereas CYTOP-FBGs without the over-clad achieve almost zero sensitivity to humidity and sensitivity to temperature of 26.7 pm/degrees C.
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