Abstract
In this contribution, we provide an overview of our recent results concerning the proton radiation-induced effects of a bare Long Period Grating (LPG) inscribed in a B-Ge co-doped optical fiber by means of an excimer laser. Experimental data collected during an extensive irradiation campaign performed at the European Organization for Nuclear Research (with a fluence of 4.4·1015 p∙cm-2) have been combined with numerical simulations in order to estimate the variations of the major parameters affecting the grating response during the high dose proton exposure. A maximal radiation-induced variation of the core effective refractive index of ~1.61·10-4, responsible for a resonance wavelength red shift of ~44 nm, was retrieved at the maximal absorbed dose of 1.16 MGy. At the same time, a relevant decrease of ~0.93·10-4 in the grating refractive index modulation was estimated, leading to a reduction of the resonant dip visibility of ~12 dB. The spectral response of the LPG and the optical fiber parameters were analyzed also during the relaxation phase, showing a partial recovery of the wavelength shift due to a decrease of the core refractive index, without any relevant change in the dip visibility as a consequence of the constant grating modulation.
© 2020 The Author(s)
PDF ArticleMore Like This
Gaia Maria Berruti, Tiago Filipe Pimentel Das Neves, Marco Consales, Patrizio Vaiano, Giuseppe Quero, Paolo Petagna, and Andrea Cusano
WF57 Optical Fiber Sensors (OFS) 2018
Diego Di Francesca, Gaetano Li Vecchi, Yacine Kadi, Markus Brugger, Sylvain Girard, and Antonino Alessi
WC1 Optical Fiber Sensors (OFS) 2018
Shlomi Zilberman, Garry Berkovic, Ehud Shafir, Mirit Dadon, Mantefardo Alefe, Kobi Ben Meir, Alexander Krakovich, and Tzach Makmal
Th4.5 Optical Fiber Sensors (OFS) 2020