UV-induced modification of stress distribution in optical fibers and its contribution to Bragg grating birefringence.
This paper discusses the importance of stress-induced contributions to the photo-induced birefringence observed in fiber Bragg gratings. Optical tomography measurements are performed in exposed and unexposed fibers to extract the stress profiles induced by UV-writing of fiber Bragg gratings for various exposure levels. A photoelastic analysis and a high-order isoparametric finite elements method are then used to calculate the birefringence caused by stress profile modifications. The results are compared to the birefringence directly measured by spectral analysis of a chirped fiber grating with multiple phase-shifts. We can therefore estimate the fraction of the photo-induced birefringence due to stress-induced anisotropy following UV exposure.
Centre d'optique, photonique et laser (COPL), Département de génie électrique et de génie informatique, Université Laval, Québec (Québec) Canada.
N
N
Belhadj
Y
Y
Park
S
S
Larochelle
K
K
Dossou
J
J
Azaña
D016880:Anisotropy; D001718:Birefringence; D003198:Computer Simulation; D004548:Elasticity / Q000528:radiation effects; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005336:Fiber Optic Technology / Q000295:instrumentation*; D008027:Light; D008962:Models, Theoretical; D055100:Optical Fibers; D055095:Optics and Photonics / Q000295:instrumentation*; D012031:Refractometry / Q000295:instrumentation*; D012542:Scattering, Radiation; D013314:Stress, Mechanical; D014466:Ultraviolet Rays