P
Pierre Niay
Researcher at Lille University of Science and Technology
Publications - 108
Citations - 2343
Pierre Niay is an academic researcher from Lille University of Science and Technology. The author has contributed to research in topics: Fiber Bragg grating & Optical fiber. The author has an hindex of 28, co-authored 108 publications receiving 2289 citations. Previous affiliations of Pierre Niay include Centre national de la recherche scientifique.
Papers
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Journal ArticleDOI
Densification involved in the UV-based photosensitivity of silica glasses and optical fibers
Marc Douay,Wenxiang Xie,T. Taunay,Pascal Bernage,Pierre Niay,Patrick Cordier,Bertrand Poumellec,Liang Dong,J.F. Bayon,H. Poignant,E. Delevaque +10 more
TL;DR: A comprehensive survey of photosensitivity in silica glasses and optical fiber is reviewed in this article, where the mechanisms contributing to germanium or aluminum doped fiber photosensitivity are discussed within the framework of photoelastic densification models.
Journal ArticleDOI
Experimental evidence of two types of photorefractive effects occuring during photoinscriptions of Bragg gratings within germanosilicate fibres
W.X. Xie,Pierre Niay,Pascal Bernage,Marc Douay,J.F. Bayon,T. Georges,M. Monerie,Bertrand Poumellec +7 more
TL;DR: In this article, the authors used real time measurements of the spectral transmission, of the fwhm bandwidth and of the resonance wavelength of the Bragg gratings to estimate the refractive index change photoinduced in the core of the fiber.
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UV induced densification during Bragg grating inscription in Ge:SiO2 preforms
Bertrand Poumellec,P. Guénot,Isabelle Riant,Pierre Sansonetti,Pierre Niay,Pascal Bernage,J.F. Bayon +6 more
TL;DR: In this paper, surface level modulations associated with the writing of the Bragg grating were investigated and it was shown that a densification takes place. And the corresponding peak to peak change of the refractive index to be 1.4−1.7 × 10−4 whether a pulsed or a CW irradiation mode is used.
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Gain control in erbium-doped fibre amplifiers by lasing at 1480 nm with photoinduced Bragg gratings written on fibre ends
TL;DR: In this paper, photo-induced Bragg reflectors at 1480 nm are written at both ends of the fiber amplifier and laser oscillation clamps the gain and suppresses low frequency signal or pump induced gain fluctuations.
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The UV-induced refractive index grating in Ge: preforms: additional CW experiments and the macroscopic origin of the change in index
TL;DR: In this paper, a simplified model which assumes that the UV-induced periodic corrugations result from both permanent and elastic strains is presented, which accounts not only for a large part of the measured refractive index change but also for the localization of the UVinduced birefringence along the grating wavevector.