1. Behavior of femtosecond laser-induced eccentric fiber Bragg gratings at very high temperatures
- Author
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Hicham Chikh-Bled, Christophe Caucheteur, Álvaro González-Vila, Boumediène Lasri, and Karima Chah
- Subjects
PHOSFOS ,Optical fiber ,Birefringence ,Materials science ,business.industry ,Physics::Optics ,Polarization-maintaining optical fiber ,02 engineering and technology ,Long-period fiber grating ,Cladding (fiber optics) ,Cladding mode ,01 natural sciences ,Atomic and Molecular Physics, and Optics ,law.invention ,010309 optics ,020210 optoelectronics & photonics ,Optics ,Fiber Bragg grating ,law ,0103 physical sciences ,0202 electrical engineering, electronic engineering, information engineering ,Optoelectronics ,business - Abstract
In this work, eccentric Bragg gratings are photoinscribed in telecommunication-grade optical fibers. They are localized close to the core-cladding interface, yielding strong cladding mode resonance couplings and high photoinduced birefringence. Their transmitted amplitude spectrum is measured with polarized light while they are exposed to temperature changes up to 900°C. Despite the gratings' overall good thermal stability that confirms their robustness for high-temperature refractometry, we report an interesting polarization effect depending on both the cladding mode resonance family and mode order. While the core mode birefringence decreases with growing temperatures, certain cladding mode resonances show an increase in wavelength splitting between their orthogonally polarized components. This differential behavior is of high interest in developing high-resolution, multiparametric sensing platforms.
- Published
- 2016