Arc-discharge effects on residual stress and refractive index in single-mode optical fibers.

Abstract

Arc-discharge effects on the residual stress and refractive index in single-mode optical fibers are investigated using a previously developed three-dimensional concurrent stress-index measurement method. Using commercial optical fibers and a commercial fusion splicer, the residual stress and refractive index perturbations caused by weak electrical arc discharges in single-mode fibers were measured. Refractive index changes greater than 10-4 and longitudinal perturbation lengths of less than 500μm were shown to be possible. The subsequent prospects for arc-induced long-period fiber gratings are analyzed, and a typical transmission resonance is predicted to have a depth of 56dB and a bandwidth of 0.08nm at a wavelength of 1585nm. The results of this investigation will be useful in modeling device performance and optimization of arc-induced long-period fiber grating fabrication.