title: Effect of CO2 laser irradiation on the refractive-index change in optical fibers.
abstract: The effect of CO2 laser irradiation on the refractive-index change in optical fibers is investigated by measuring the interference fringe shift formed by a long-period fiber grating pair. The refractive-index decrease on CO2 laser irradiation was due to relaxation of the residual stress, which was formed in optical fibers during the drawing process, and the refractive-index decrease was found to increase linearly with the drawing force. The effect of the CO2 laser output power on residual-stress relaxation, and fiber elongation was also studied.
authors.affiliation: Department of Information and Communications, Kwangju Institute of Science and Technology, Gwangju, Korea.
authors.forename: Bok Hyeon
authors.initials: BH
authors.lastname: Kim
authors.forename: Tae-Jung
authors.initials: TJ
authors.lastname: Ahn
authors.forename: Dug Young
authors.initials: DY
authors.lastname: Kim
authors.forename: Byeong Ha
authors.initials: BH
authors.lastname: Lee
authors.forename: Youngjoo
authors.initials: Y
authors.lastname: Chung
authors.forename: Un-Chul
authors.initials: UC
authors.lastname: Paek
authors.forename: Won-Taek
authors.initials: WT
authors.lastname: Han