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We report on improved spatial uniformity of sensor grating arrays in offset and multicore fibers. We show improvement over conventional side writing in such fibers, in which cores offset from the center of the fiber exhibit grating strength variations due to lensing at the fiber surface. Such strength variations can degrade the performance of sensing systems that rely on continuous scattering from offset cores along a fiber. Our improved system uses multicore fibers whose coating is UV transparent and applies index matching materials to mitigate lensing aberrations. We show that it is capable of continuously inscribing gratings over any length of fiber.
P. S. Westbrook,K. S. Feder,T. Kremp,T. F. Taunay,E. Monberg,R. Ortiz, andG. Puc
"Improved uniformity of sensor gratings in offset core fibers with fiber lensing mitigation", Proc. SPIE 9702, Optical Fibers and Sensors for Medical Diagnostics and Treatment Applications XVI, 97020J (7 March 2016); https://doi.org/10.1117/12.2213584
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P. S. Westbrook, K. S. Feder, T. Kremp, T. F. Taunay, E. Monberg, R. Ortiz, G. Puc, "Improved uniformity of sensor gratings in offset core fibers with fiber lensing mitigation," Proc. SPIE 9702, Optical Fibers and Sensors for Medical Diagnostics and Treatment Applications XVI, 97020J (7 March 2016); https://doi.org/10.1117/12.2213584