title: Chromatic dispersion control in photonic crystal fibers: application to ultra-flattened dispersion.
abstract: In order to control dispersion and dispersion slope of indexguiding photonic crystal fibers (PCFs), a new controlling technique of chromatic dispersion in PCF is reported. Moreover, our technique is applied to design PCF with both ultra-low dispersion and ultra-flattened dispersion in wide wavelength range. A full-vector finite element method with anisotropic perfectly matched layers is used to analyze the dispersion properties and the confinement losses in a PCF with finite number of air holes. It is shown from numerical results that it is possible to design a fourring PCF with flattened dispersion of 0 +/- 0.5 ps/(km.nm) from 1.19 m to 1.69 m wavelength range and a five-ring PCF with flattened dispersion of 0 +/- 0.4 ps/(km.nm) from 1.23 m to 1.72 m wavelength range.
authors.forename: Kunimasa
authors.initials: K
authors.lastname: Saitoh
authors.forename: M
authors.initials: M
authors.lastname: Koshiba
authors.forename: T
authors.initials: T
authors.lastname: Hasegawa
authors.forename: E
authors.initials: E
authors.lastname: Sasaoka