Strain sensing with femtosecond inscribed FBGs in perfluorinated polymer optical fibers

P. Stajanca; A. Lacraz; K. Kalli; M. Schukar; K. Krebber

doi:10.1117/12.2225081

29 April 2016 Strain sensing with femtosecond inscribed FBGs in perfluorinated polymer optical fibers

P. Stajanca, A. Lacraz, K. Kalli, M. Schukar, K. Krebber

Proceedings Volume 9899, Optical Sensing and Detection IV; 989911 (2016) https://doi.org/10.1117/12.2225081
Event: SPIE Photonics Europe, 2016, Brussels, Belgium

Abstract

In this work, the potential of fiber Bragg gratings (FBGs) in low-loss perfluorinated polymer optical fibers (PF-POFs) is explored. The FBG is femtosecond-inscribed in a commercial multi-mode (MM) PF-POF based on Cytop polymer. Femtosecond inscription leads to creation of a highly saturated grating with a number of higher order reflection peaks visible throughout the visible and near-infrared spectral region. For 2 mm long FBG having a pitch of 2.2895 μm, a total of nine higher-order MM reflection bands are visible spanning from 1548 nm (4th order) to 520 nm (12th order). Strain sensitivity was measured for 6 peak bands in 500-900 nm region, where relatively low cost CCD based spectrometers and broadband LEDs are available. Strain sensitivity increases almost linearly with increasing initial peak wavelength, growing from 4.82 ± 0.02 nm/% measured for 12th order peak at 517 nm to 8.12 ± 0.04 nm/% measured for 7th order peak at 883 nm. These values correspond to roughly 20 % higher sensitivity than silica FBGs exhibit in this spectral range. The gratings in PF-POFs combine the higher strain sensitivity and low-loss operation while maintaining the mechanical advantages of polymer optical fibers. Therefore, they hold a high potential for considerable broadening of polymer optical fiber Bragg gratings application range.

Citation Download Citation

P. Stajanca, A. Lacraz, K. Kalli, M. Schukar, and K. Krebber "Strain sensing with femtosecond inscribed FBGs in perfluorinated polymer optical fibers", Proc. SPIE 9899, Optical Sensing and Detection IV, 989911 (29 April 2016); https://doi.org/10.1117/12.2225081

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