title: Resonant optical nonlinearity measurement of Yb(3+) / Al(3+) codoped optical fibers by use of a long-period fiber grating pair.
abstract: A new method of measuring optical nonlinearity for resonant nonlinear optical fibers is proposed. A long-period fiber grating (LPG) pair was used to measure the nonlinear refractive index n(2) of a Yb(3+)/Al (3+) codoped optical fiber, which was spliced between the two LPGs, as the fiber was pumped with a laser diode. The nonlinear refractive index of the Yb(3+)/Al (3+) codoped fiber near 1580 nm depended on the pump power. As the pump power increased, the nonlinear refractive index decreased. At launched pump powers of 2-8 mW, the nonlinear refractive index of the Yb(3+)/Al (3+) codoped fiber near 1580 nm was ~7.5x10(-15)m (2)/W .
authors.forename: Y H
authors.initials: YH
authors.lastname: Kim
authors.forename: B H
authors.initials: BH
authors.lastname: Lee
authors.forename: Y
authors.initials: Y
authors.lastname: Chung
authors.forename: U C
authors.initials: UC
authors.lastname: Paek
authors.forename: W-T
authors.initials: WT
authors.lastname: Han