Title :
Behavior of Bragg gratings, written in germanosilicate fibers, against /spl gamma/-ray exposure at low dose rate
Author :
Niay, P. ; Bernage, P. ; Douay, M. ; Fertein, E. ; Lahoreau, F. ; Bayon, J.F. ; Georges, T. ; Monerie, M. ; Ferdinand, P. ; Rougeault, S. ; Cetier, P.
Author_Institution :
Lab. de Dynamique Moleculaire et Photonique, Univ. des Sci. et Tech. de Lille Flandres Artois, Villeneuve d´Ascq, France
Abstract :
Bragg gratings have been written within four germanosilicate fibers either by a pulsed or by a continuous-wave exposure of each fiber to a coherent UV two-beam interference pattern. These gratings have been exposed under steady state conditions to /spl gamma/-ray doses as high as 104 Grays. The dose rates ranged between 10 Gy/h and 1.3×102 Gy/h. The transmission spectra of the fibers have been recorded during and after the /sup 60/Co irradiation, near the grating Bragg wavelengths. Whereas the induced loss reached 600 dB/km near 1.3 μm, no significant change in the spectral characteristics of the gratings could be detected within the experimental accuracy, enabling their future use in a nuclear environment.
Keywords :
diffraction gratings; gamma-ray effects; laser beam effects; optical fibre fabrication; optical fibres; /spl gamma/-ray doses; /spl gamma/-ray exposure; /sup 60/Co irradiation; 1.3 mum; 600 dB; Bragg gratings; SiO/sub 2/-GeO/sub 2/; coherent UV two-beam interference pattern; continuous-wave exposure; germanosilicate fibers; grating Bragg wavelengths; induced loss; low dose rate; nuclear environment; pulsed exposure; spectral characteristics; steady state conditions; transmission spectra; Bragg gratings; Fiber gratings; Optical fiber communication; Optical fiber networks; Optical fiber polarization; Optical fiber sensors; Optical fibers; Power generation; Silicon compounds; Steady-state;
Journal_Title :
Photonics Technology Letters, IEEE
