title: Explicit formulas for transmission characteristics of graded-index oval core fibers.
abstract: Transmission characteristics of graded-index oval (GIO) core fibers are theoretically analyzed, and basic equations representing the specific properties of the fiber are obtained. Formulas for the propagation constant, the field-profile function, the cutoff condition, and the total number of guided modes are derived in explicit forms. The formula for the change of the Gaussian beam radius as a function of the propagation distance is also given, and the numerical example agrees well with experimental data and agrees completely with that obtained by the beam-propagation method. These explicit expressions are useful for finding optimum structural parameters of GIO fibers to be used in practical fields.
authors.affiliation: Faculty of Engineering, Utsunomiya University, 7-1-2 Yoto, Utsunomiya 321-8585, Japan. kazuos@cc.utsunomiya-u.ac.jp
authors.forename: Kazuo
authors.initials: K
authors.lastname: Shiraishi
authors.forename: Akira
authors.initials: A
authors.lastname: Ogura
authors.forename: Hidehiko
authors.initials: H
authors.lastname: Yoda